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ILO24 > Systems Review > Flashcards

Systems Review Flashcards

1
Q

B21 Highlights - ADS valves & ED

What is the motive force for ADS valves?

What are the ECCS permissive setpoints for ADS?

Shutoff head for LPCS and RHR Pumps?

A
  1. SRIA
  2. LPCS -> 145#, RHR -> 125#
  3. LPCS -> 450#, RHR -> 280#
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2
Q

B21 Highlights - ADS

Draw ADS Logic

A
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3
Q

B21 Highlights - ADS

ADS automatic actuation was initiated on a valid L1 signal.

What alarm(s) actuate on the initial signal?

What does the ADS A/B Timer 90 Sec and Running alarm indicate?

How can these timers be reset/defeated?

How can ADS be initiated immediately if defeated/reset?

A

ADS A/B 105 Sec Time Delay Logic Timer Running
ADS A/B Instantaneous Logic Initiated
ADS RHR/LPCS Permissives for L1
ADS Level 3 Permissive

ADS Logic timer has been running for 90 seconds.
Serves as a warning that there are 15 more seconds
to defeat ADS if it is desired.

Depress seal in reset or
Keylocks to inhibit

Arm & Depress

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4
Q

B21 Highlights - SRVs

How many vacuum breakers are on an SRV tail pipe?

Where do they vent from?

What indications exist showing SRV seat leakage?

A

2 Vacuum breakers

Vent from the Drywell

SRV Tailpipe temperature and pressure. Temperature is on te 814 recorder (alarm at 240F), pressure is indicated by tattle-tail on P601. Red when > 30 psig.
Also, increase of SP temp can be an indicator.

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5
Q

B21 Highlights - SRVs

Setpoints for LLS, Safety, and Relief modes of SRV operation.

Where do SRVs get their motive force?

Below what SP level will risk tailpipe damage if the SRVs lift?

A

Safety:
1165# (8), 1180# (6), 1190# (5)
Relief:
1103# (051D), 1113# (9), 1123# (9)
LLS Setpoints:
051D - 1033#, 926# Reseat
051C 1073#, 936# Reseat
Rest 1113#, 946# Reseat

051D & ADS valves get SRIA.
The rest (10) get IA.

SP Level below 5.25 Feet

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6
Q

B21 Highlights - MSIVs

MSIV Closure Signals

How does MSL isolation work?

A

Low MS Line Pressure - 807# (MS in Run)
Low Condenser Vacuum - 21.5 HgA
Reactor Lvl Low - L1 16.5”
High MS Line flow - 254 psid
High TB Temp - 145.8F
High ST Temp - 156F or 152.5F

Each Steam Line has 2 Trip Channels that use 1/2 Twice logic. If ANY MSL trip function actuates, all 4 MSLs will isolate.

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7
Q

B21 - NS4

List all of the NS4 isolations & their setpoints.

A

Balance of Plant:
1.68# drywell pressure
Rx Lvl Lo L2 130”
Manual
Test
RWCU:
L2 - 130”
SLC Pump init
Loss of E31 LD
NRHX Outlet High - 140F
RWCU Room Temp HI - 135F - 141F (various)
ST Temp Hi - >156F
RWCU Diff Flow Hi - >59gpm 10 min TD
RHR Radwaste/Sample:
L3 178”
RHR Room Temp (Not coincident)
DW 1.68#
RHR SDC:
L3 178”
RHR Room Temp (Not coincident)
RPV Press Hi > 135 psig
Rx Plant Sampling:
MSL Hi-Hi Rad - 1.5x
L2 130”

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8
Q

B21 - NS4

Which two trip channels, if simultaenously actuated, will not result in any NS4 isolations?

How does a loss of RPS effect NS4?

A

A&C or D&B - IB/OB logic Is AD & BC, 1/22 is AC & BD. IB/OB logic requires both channels in a trip system to get either an IB or OB isolation. Either of these two configurations will leave both types of isolations a single trip from actuation, but won’t actuate anything individually.

Loss of RPS will result in effected division receiving an isolation signal once RPS power is restored.

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9
Q

B21 - NS4

RHR A is in use for SDC & a loss of B RPS occurs. What happens to SDC?

A

SDC is lost because SDC trip channels are split on their divisional power.

The IB & OB trip systems each have a channel supplied by each division (A is powered from RPS A & D is powered from RPS B).

This means that a loss of either RPS system will break continuity in the trip channel for BOTH IB & OB isolations.

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10
Q

B21 - NS4

Which system isolations are not effected by NS4?

A

RHR LOCA & RCIC Isolations

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11
Q

B21 - NS4

Which systems have BOP isolations?

Which systems are capable of overriding their isolation signal with no operator input?

A

D17 - Plant Rad Monitoring
E12 - RHR
G41 - FPCCU
G42 - SPCU
G50 - Liquid Radwaste
G61 - Liquid RW Sumps
M14 - Containment DW Purge
M16* - DW Vac Relief
M17* - Containment Vac Relief
M51 - CGMCs
P11 - Cond Xfer/Storage
P22 - Mixed Bed
P50 - Cont Chill Water System
P51 - Svc Air
P52 - Instrument Air - Airlocks only
P53 - Personnel Air Locks
P54 - Fire Protection
P86 - Nitrogen System

*M16 & M17 will open themselves in a vacuum condition even with a LOCA signal present.

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12
Q

B21 - NS4

What valves isolate during an RHR SDC isolation?

A

RHR Return to Upper Pool (F037A/B)
RHR SDC Return to Vessel
(F053A/B)
RHR SDC Suction Isolations
(F008, F009)
RPV Head Spray (F023, RHR A only. B does not have head spray).

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13
Q

B33 - Recirc

What are the indications of a failed jet pump?

What are the hazards associated with a failed jet pump?

A

Drop in Prx, drop in total core flow, drop in core plate D/P

Jet pumps act as barrier to provide refloodable volume of 2/3 fuel height.

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14
Q

B33 - Recirc

What are indications of Recirc Pump seal failure?

What indication(s) on Recirc Pump parameters require an immediate pump trip?

A

Indications
High/Low flow in seal staging lines
High flow in seal leak detection lines
Seal pressures as indicated below
Inner seal fails, outer seal pressure will increase.
If outer seal fails, its pressure will drop and potentially get a high leak rate alarm.
Pump seal temperature increase.

If pump seal temperature reaches 210F, pump must be tripped.

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15
Q

B33 - Recirc

What are the Recirc pump downshifts?

What are the bases for them and when are they bypassed?

How are these trips provided?

A

Low Level Downshift Intlk
178” Rx Level. Protects jet pumps from cavitation and raises reactor level by inducing more boiling. Provided by the 5 bkr tripping.

EOC RPT
TCV Fast closure or TSVs < 90% open. Only active > 38% RTP as indicated by 1st stage shell pressure (approx. 212psig). Recover loss of thermal margin at end of cycle, when a scram may not insert enough negative reactivity to counteract a power excursion. 3 & 4 breakers trip.

Low Feed Flow
< 3.43 mlbm/hr for 15 seconds. Protects FCVs. Bypassed with the Low FDW Bypass Switch. 5 Breaker trips.

Steam Dome/Pump Suction ΔT
<10F for 15 seconds. Bypassed by keylock on B33-P001. Protects recirc pumps and FCVs. 5 Breaker trips.

ATWS Downshift
1083#, inserts negative reactivity anticipating an ATWS. 3 & 4 breakers trip.

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16
Q

B33 - Recirc

What are the Recirc pump trips?

What are the bases for them and when are they bypassed?

How are these trips provided?

A

Just one

ATWS RPT
Level 2 130”
or
RPV > 1083# and APRMs not in downscale after 25 seconds.

Trips all RCP breakers.

Provided to combat ATWS.

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17
Q

B33 - Recirc

How do RCP behave when starting in fast and slow?

A

Starting in fast, breakers close and pump increases to rated speed.

Starting in slow, pumps are initially started in fast and then the 5 breaker opens allowing the pump to coast down to 25% flow. From there, slow speed breakers will close.

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18
Q

B33 - Recirc

What are the auto shifts and trips for FCV HPUs?

A

Shifts
Low Pressure
Low oil level
OC/UV
Warm Oil
Velocity Error

Trips (FCV Lockup)
Low pressure with other in maint.
Oil level empty
OC/UV with other in maint.
High Oil temp

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19
Q

B33 - Recirc

What conditions cause a FCV runback?

What happens?

What if the FCV is already closed further than its runback position?

A

RCP in Fast
 &&
 RFPT Trip && RPV Lvl 4 (192”)
  OR
 Condenser Vac > 5.6” HgA with either
   < 3 CWP running
    OR
   #1 Steam Bypass Valve full open

FCVs run back to 48% of rated flow, 17% of indicated FCV position, approx 58 mlbm/hr.

FCV doesn’t move.

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20
Q

B33 - Recirc

This card is reserved for shit about the AFDL which I have shit knowledge of.

A

Look here in the future for better stuff.

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21
Q

C11 - CRDH

Draw or Explain flow path for CRDH system.

A
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22
Q

C11 - CRDH

What is the purpose of the FCVs in the CRDH system?

What position does the valve fail in a loss of power?

What position for a loss of air?

What position for a scram?

What are the implications of this valve closing all the way?

A

FCV maintains a constant DP across the CRDH system, maintaining a constant flow.

Valve is pnuematic.

On a loss of air, valve fails closed.

On a scram, valve fails closed.

When the FCVs are closed, all flow is directed to the charging header (except for a small amount allowed to pass by for cooling downstream), which is the motive force of the scram.

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23
Q

C11 - CRDH

What happens to the CRD Pumps during a LOOP?

LOCA?

A

LOOP -> Pumps trip, must be manually restarted once power is restored to the bus.

LOCA -> Pumps trip, but bus will not re-energize without operator action.

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24
Q

R10

List loads on the L10 Bus

A

CW Pump C
MFP
Interbus LH-1-A
S/U supply to L11
S/U supply to L12

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25
Q

R10

List loads on the L11 Bus

A

CW Pump A
B33 Recirc Pump A (Fast)
Interbus LH-1-B
LF-1-A/C/E/H
(ACEHOLE)

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26
Q

R10

List loads on the L12 Bus

A

CW Pump B
B33 Recirc Pump B (Fast)
Interbus LH-1-C
LF-1-B/F/D/G

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27
Q

R10

List loads on the H11 Bus

A

RFBP A/C
CBP A/C
HWP A
CVCW Chiller A
TBCW Chiller A
LFMG A
SY Load Center

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28
Q

R10

List loads on the H12 Bus

A

RFBP B/D
CBP B
HWP B/C
CVCW Chiller B
TBCW Chiller B
LFMG B
U1 SA & IA Compressors
SW Pump A

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29
Q

R10

List loads on the XH busses

A

XH11:
CRD Pump A
NCC Pump A

XH12:
CRD Pump B
NCC Pump B
SW Pump B
XF-1-A

XH21: (Not diesel backed)
NCC Pump C
SW Pump D

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30
Q

R10 - Regarding Aux Transfer Switch function

What is the purpose of the Aux Transfer Switch?
Will the transfer still happen with the switch in “Off”?

A

Aux Transfer Switch will prevent powering an L bus from 2 seperate transformers, which would result in twice the fault current with a fault in the affected L bus.

With the switch in “Off,” the transfer still occurs.

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31
Q

R10 - Regarding Fast Bus Transfer of L and H busses

What causes a fast bus transfer to occur?
From which sources (primary or alternate) does a fast bus transfer occur?
What will happen when a breaker tries to transfer to a faulted bus?

A

Breakers auto transfer to alternate power supply if primary power supply goes down.
Breakers will not return to primary source if alternate source is subsequently lost.
Breaker will land in the trip free position.

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32
Q

C11 - RCIS

What parameters does the RGD Cabinet monitor?

A

Scram valve positions, SRI switch positions, and HCU status.

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33
Q

C11 - RCIS

List the rod blocks associated with SRMs, IRMs, and APRMS

A

SRMs
Downscale - 0.7 CPS
Upscale - 1x105
INOP - Unplugged, voltage hi/low, SRM not in operate
Wrong Position - <100 CPS && Detector not full in

IRMs
Downscale - 5/125
Hi Flux - 80/125
INOP - Unplugged, voltage hi/low, IRM not in operate
Wrong Position - Detector not full in && Not in run

APRMs
Downscale - < 4%
Upscale > 12% or >0.628wr + 55% clamped at 108%
INOP
Coolant System Flow Upscale @ 111%

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34
Q

C11 - RCIS

List the rod blocks not associated with Nuclear Instruments, and when they are bypassed.

A
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35
Q

C22 - RRCS

List the logic combinations for RRCS

Drawing is acceptable.

How long will ARI be locked in before it can be reset?

How long will RRCS initiation be locked in before it can be reset?

A

ARI
Test ARI Keylock || Arm & Depress || Rx Pressure > 1083# || Rx Wtr Lvl 2

Recirc Pump Downshift
Rx Pressure > 1083#

Recirc Pump Trip
Level 2 || Rx Pressure > 1083# with Prx > 4% for 25 seconds

FWRB
Rx Pressure > 1083# with Prx > 4% for 25 seconds

30 Seconds for ARI, 12 Minutes for RRCS reset

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36
Q

C41 - SLC

What is SDM?

A

Amount of reactivity by which the reactor is or would be subcritical if it is Xenon free, with Moderator temp ≥ 68F, and all control rods fully inserted with the exception of the highest worth rod fully withdrawn.

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37
Q

C41 - SLC

SLC & ABI both inject to the core through a similar path.

Which system do they inject to & what is the difference in their injection point?

A

They inject into the HPCS system.

SLC injects directly into the HPCS sparger, downstream of the HPCS isolation valves.

ABI injects upstream of the HPCS OB Isolation valve.

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38
Q

C41 - SLC

What NS4 isolation occurs when SLC is initiated?

How is this isolation input?

A

G33 - RWCU isolation occurs when SLC is initiated.

The isolation is interlocked to both SLC keylocks. Initation of either division will cause the isolation.

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39
Q

C41 - SLC

What are the SLC pumps flow rates?

What causes the SLC pumps to trip?

What are the permissives for a SLC pump start?

A

43 GPM each at 1250#

Trips on 200 Gal SLC tank level

Suction valve full open.

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40
Q

C41 - SLC

What are squib valves?

The continuity of the A SLC system squib valve is not illuminated. The operator determines that the bulb is good. What does this mean for system operability?

A

Squib valves are valves that have a disc loaded with an explosive charge. When SLC is initiated, these valves blow their disc to allow for SLC flow.

With the light not illuminated, that portion of the SLC system will not function, but the remaining squib valve will allow for full flow from both pumps due to the characteristics of the positive displacement SLC pumps.

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41
Q

C41 - SLC

How does heat trace play in to SLC system?

What are the SLC system temperature requirements for operability?

A

Heat trace keeps the SLC system piping warm, thus the water inside. If the temperature falls below a threshold, the boron will crystalize and foul up the pipe.

Required to be ≥ 70F & ≤ 150F for operability.

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42
Q

C51 - RPS

Count rates for SRM operability?

How is signal to noise ratio calculated?

A

≥ 3.0 CPS or
≥ 0.7 CPS with a signal to noise ration ~2:1.

Count rate full in vs count rate full out.

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43
Q

C51 - RPS

A reactor scram was inserted. RRCS limits were not reached.

What are the statuses of the Scram valves, B/U scram valves, and ARI valves?

A

Scram Valves - De-Energized

B/U Scram Valves - Energized

ARI Valves - De-energized

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44
Q

C51 - RPS

What is required for APRMs to be operable? (Logic and Administrative)

What else can make an APRM inoperable?

A

14 or more LPRMs functioning for APRMs to be operable.

Administrative limit must have at least 2 LPRMs per level operable.

Low/High volts, switch not in operate, card not in file, flow card switch not in operate.

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45
Q

C51 - RPS

APRM Recirc Flow unit, what is the calculation of this trip and what is the basis?

A

0.628wr + 61% (55% for rod block) clamped at 111%.

Basis is to protect from a slower rise in power that could compromise the MCPR limits.

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46
Q

C51 - RPS

What are the APRM rod blocks and scram signals?

A
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47
Q

C51 - RPS

What are the IRM rod blocks and scram signals?

A
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48
Q

C51 - RPS

What are the SRM rod blocks and scram signals?

Why will the SMR scram signals never occur?

A

SRM scram signals are bypassed with shorting links.

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49
Q

C51 - RPS

When OPRMs are operable, what region is considered the Immediate Exit region?

What region is considered the OPRM enabled region?

What does this region become and what actions are required upon entry when OPRMs are inoperable?

A

At > 75% load line, with core flow < 42 mlbm/hr.

< 63.5% drive flow with > 23.3% APRM Reactor power

When OPRMs are inoperable, this region is considered the Manual Scram region and a Manual Scram is required immediately.

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50
Q

C51 - RPS

What are the three factors monitored by OPRMs?

Which one is credited in safety analysis?

A

Period, Amplitude, and Growth.

Only period is credited.

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51
Q

C51 - RPS

AFDL in control alarm immediate actions

A

Verify Prx has not actually increased (indicating upscale failure on the monitoring instrument, A or E APRM).
If a failure, lock up HPUs
If not a failure, reduce flow by closing FCVs.

If FCV oscillations occur, lock up HPUs and reduce power with control rod insertion.

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52
Q

In the below PF map, what are the bases of each identified line?

A
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53
Q

C61 - Remote Shutdown

What is the purpose of the RSD system?

What parameters does the RSD system allow for control of?

A

To get to a cold, low pressure condition from outside of the control room.
(Mode 3)

Remote control of Rx Pressure, Level, and Suppression Pool Temp.

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54
Q

C61 - Remote Shutdown

Which components can be controlled on the Remote S/D panels without taking remote control?

A

INBD MSIVs

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55
Q

C61 - Remote Shutdown

Remote shutdown systems are divisionally separated, but there are some Div 2 components that can be controlled on Div 1 RSD panel.

Which components are they?

A

E12-F006B, E12-F009 (Div 2 valves for SDC)

Inboard MSIVs.

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56
Q

C61 - Remote Shutdown

Most interlocks are removed when RSD is in control. What interlocks are still functional?

A

ESW Pump & valve interlock
RCIC Overspeed
SRV safety function
ECC B Auto Start
RHR Reactor Drain Paths
The “nuclear snowman” changes such that E12-F004 no longer monitors E12-F006 as a permissive (see picture)

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57
Q

C61 - Remote Shutdown

How does SDC change in RSD?

A

SDC uses the LPCI injection line rather than the feedwater sparger.

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58
Q

C61 - Remote Shutdown

How will RCIC respond to an automatic initiation signal while RSD is in control?

How will RCIC support systems respond to RCIC starting?

A

RCIC does not autostart when RSD is in control.

Support systems will not autostart.

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59
Q

C61 - Remote Shutdown

How do SRVs respond when RSD is in control?

If RSD is in control, how will SRVs respond to relief and ADS signals?

A

The three SRVs on the RSD panel will have their applicable ADS, relief, and/or setpoint set-down actuations overridden.

If in RSD control, ADS, SPSD, and relief will still occur on the other division, as well as the remaining 16 valves not on the RSD panel as applicable.

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60
Q

C61 - Remote Shutdown

The Div 1 CCCW chiller can be placed in RSD control in two locations. Where are these locations?

If the Div 1 CCCW chiller is in RSD control, what signals can auto-start it?

What trips are inactive while in RSD control?

A

Locally or at the EH11 breaker.

There are no auto-starts, only local start.

All trips are active.

61
Q

C61 - Remote Shutdown

What immediate actions are required if evacuating the control room? (entering ONI-C61)

A

Scram, M/S locked in S/D
Verify Rods inserted
Verify power decension
Trip Main turbine
Transfer 3 DG to Local

62
Q

C61 - Remote Shutdown

ONI-C61 was entered and rods did not insert upon scram.

Which methods of inserting control rods exist outside of the control room?

Where would verification of rod insertion be available?

A

Preferred method: Open ATWS UPS Dist Panel Bkrs to de-energize ATWS UPS. This does not close the MSIVs.

Alt Method: Open RPS breakers to de-energize RPS.

Rod positions can be viewed on the ICS computer in Div 1 RSD room or the CC638 TIPs area.

63
Q

C71 - RPS

List the loads on the RPS bus.

A

SRMs & IRMs
Containment Vent Exhaust Rad Monitors
RPS Logic & Solenoids
MSIV Solenoids
MSL Rad Monitors
NS4 Logic

64
Q

C71 - RPS

RPS system has normal and alternate power supplies for each bus. Which power supplies are diesel backed?

A

RPS A normal & alternate
( B C C D/8 8 12 12)

65
Q

C61 - RPS

At what values will the RPS MG Sets trip?

At what values will the RPS EPA Breakers trip?

A

MG set
Overvolt - 140v
Undervolt - 60v
UF - 54 Hz

EPA Bkrs
Overvolt - 132v
Undervolt - 108v
UF - 57 Hz

66
Q

C71 - RPS

List the TSV & TCV scram setpoints, bases, and when they are bypassed.

A

TSV Closure
3 TSVs < 95% open
This scram is credited for the anticipated pressure/reactivity increase associated with a turbine trip.

TCV
ETS Hydraulic pressure < 530#
This scram is credited for the anticipated pressure/reactivity increase associated with a generator load reject.

Both scrams prevent MCPR from being exceeded.
Both scrams are bypassed at > 38% RTP as sensed by Turbine 1st stage shell pressure > 212#.

67
Q

C71 - RPS

List the setpoints for SDV, High Rx Pressure, and High DW pressure scrams.

What are the bases of these scrams? When are they bypassed?

A

SDV High
Instrument volume > 67% full.
Ensures a scram is inserted while there is still room in the instrument volume to receive the scram.
Bypassed with MS in Refuel/SD and keylocks on 680 in Bypass.

Rx Pressure High
1065#
Counteracts reactivity input of high reactor pressure.
Never bypassed

DW Pressure High
1.68# DW Pressure
Reduce likelihood of fuel damage and reduce energy being added to drywell & coolant.
Never bypassed

68
Q

C71 - RPS

List the scram set points for the High & Low reactor water level scrams.

What are the bases of these & when are they bypassed?

A

High Water Level
219” L8
High column of water decreases void formation, this scram protects MCPR by immediately reducing power.
Bypass when MS not in run.

Low Water level
178” L3
Coupled with ECCS, this scram ensures PCT , 2200F. Based on Recirc line break analysis.
Bypassed with MS in S/D & L3 Bypass Keylocks bypassed.

69
Q

C71 - RPS

When will a MSIV closure scram input?

What is the basis of this scram, and when is it bypassed?

A

3 MSIVs < 92% Open.
This is in pairs, so an inboard & outboard MSIV from the same steam line will only input 1 of the 3 required signals.

Along with ECCS, ensures PCT stays below 2200F.

Bypassed when MS not in run.

70
Q

C71 - RPS

What are the APRM, IRM, & OPRM scram set points, and the basis of each?

When are they bypassed?

A

APRM Neutron Flux High
118% with MS in Run. Assumed to terminate the MSIV closure event, limits pressure below ASME limits.
15% not in run. Not credited for any analysis but serve as a backup to IRM high flux scram.

APRM simulated thermal power high (Flow Biased Scram)
0.628wr + 61%, clamped at 111%
Protect against slow thermal power transient, protects fuel by maintaining MCPR < limits.

APRM INOP
APRM is not in operate, there are < 14 LPRM inputs, or a power issue with the APRM (voltage, card OOF).

IRM Neutron Flux High
120/125 units
Protect against rod withdrawal errors to keep energy depositions below 170 cal/gm fuel failure threshold.
Bypassed with MS in Run.

IRM Inop
Card out of file, IRM not in operate, loss of power.
Bypassed with MS in Run.

OPRM
No setpoints to memorize, just know its Period, Amplitude, & Growth.
Bypassed at < 23.3% RTP or > 63.5% rated core flow.
Protects MCPR.

71
Q

E12 - RHR

Describe the logic requirements to cause an RHR LOCA signal to initiate.

A

It is an arrangement of series/parallel requirements that will initiate on two signals of either/or drywell pressure or reactor water level.

It is coincident protected in that you need two signals, but it can be a mix of either signal. See picture.

72
Q

E12 - RHR

Describe the sequence of events that occur when a LOCA signal is received.

A

RHR LOCA signal received
Diesel starts
RHR Pumps start
Containment S/O valve opens
Injection valve opens (when blue light permissive is on)
HX Bypass valve opens (110 sec TD if its closed)
HX Outlet valve opens (110 sec TD if its closed)
HX Dump valve closes
Test valve to SP closes
Signals sent to containment spray for its permissive.

73
Q

E12 - RHR

List the various actuations that occur throughout the plant with an RHR LOCA signal.

A

Both AEGTS trains start
DGs start
ESW starts
ECC starts
All ECCS related room coolers/HVAC start
FPCC F/D Isolation
SPMU timer initiates
SPCU F/D Isolation
B/U DW purge isolates
Stub buses are stripped from EH buses
NCC isolates to the DW & containment
IA isolates to DW & containment
CCCW starts

74
Q

E12 - RHR

What signals will initiate containment spray?

How does the Arm & Depress function work for containment spray?

A

LPCI + 10 min Time delay
&&
7.72# in Containment
&&
1.68# in DW || bypass keylock

Bypasses the containment pressure & time delay requirements.

75
Q

E12 - RHR

What pressure is required to allow for the RHR injection valve to open during a LOCA? (Blue Light Permissive)

What is the purpose of this permissive?

Explain how this permissive works.

What pressure is required to allow for the RHR pumps to actually inject into the vessel?

A

< 530# downstream of the injection valve.

Protects piping upstream of RHR injection valve (not rated for that high of pressure).

As soon as the light is illuminated, a 15 minute timer begins. The valve can be open within that 15 mins regardless of whether the light is on or not (to allow for venting leakby). The valve can always be opened when the light is illuminated, even past 15 minutes.

At less than 280#, RHR pumps can actually inject.

76
Q

E12 - RHR

Which RHR signals/actuations can not be overridden?

A

Containment Spray
10 Min TD Close of the HX Bypass valve

77
Q

E12 - RHR

A RHR HX bypass valve is failed open due to a power issue.

How is the operability of LPCI & containment spray effected?

A

LPCI is operable.

Containment spray is not operable.

78
Q

E12 - RHR

What RHR pumps have trips?

What are their trips?

A

Only RHR A & B have trips.

Trips on no suction path, overcurrent, or undervoltage.

79
Q

E12 - RHR

How do RHR pumps behave during a LOOP?

LOCA?

LOOP with a LOCA?

A

During a LOOP, the pumps will trip.

During a LOCA, C RHR Pump starts instantly upon signal receipt. A & B RHR pumps will start 5 seconds later.

During a LOOP with a LOCA, they will follow the LOCA rules as soon as power is restored to their busses.

80
Q

E12 - RHR

The RHR suction and Test return valves monitor each other as permissives.

Why are they monitoring each other, and in what arrangement are they monitoring?

How does this change when RHR is in RSD control?

A

They monitor each other to prevent enabling a drain path from the reactor vessel to the suppression pool.

The SDC suction isolation (E12-F006) monitors both the SP suction (E12-F004) & the Test Return to SP (E12-F024). If either of these valves are open, SDC suction isolation will not open.

The SP suction isolation monitors the SDC suction isolation, and will not open unless the SDC isolation is closed.

The Test Return valve monitors the SDC isolation and will not open unless the SDC isolation is closed.

While in Remote Shutdown control, the SP suction isolation does not monitor the SDC isolation.

81
Q

E12 - RHR

Describe the min flow valve logic for the RHR system.

When will the LPCS pump begin injecting into the core?

A

Auto close @ 1650 GPM

Auto open with Pump Brkr closed, < 1650 GPM flow for 8 seconds time delay.

At < 450#

82
Q

E21 - LPCS

Describe the sequence of events when LPCS initiates

A

RHR LOCA signal
Injection valve begins to open
LPCS pump starts
Test Return valve closes if open
Min flow valve opens with flow < 1350 GPM
Flow initiates to core @ < 450#

83
Q

E21 - LPCS

Describe how the LPCS pump behaves during the following:

LOOP
LOCA
LOOP with LOCA

A

During LOCA, pump will start 15 seconds after signal is received. This is to prevent overloading the LH-1-A xfmer.

During a LOOP, with a LOCA signal present and the pump online, the breaker for the LPCS pump will ride the bus and restart immediately upon restoration.

During a LOOP and a LOCA signal occurs, the pump will immediately restart upon restoration of power to the bus UNLESS power is not restored within 19 seconds, at which point it will follow the 15 second logic.

84
Q

E21 - LPCS

The LPCS injection valve has a permissive as indicated by a blue light. How does this permissive work?

When will this valve automatically open?

A

Blue light will illuminate when pressure downstream of the injection valve is < 600#.

This light will remain energized as long as pressure stays below this threshold.

When the light initially illuminates, the injection valve can be opened for UP TO 15 MINUTES, regardless of what pressure downstream of the injection valve indicates.

After this point, the valve will not open unless the permissive light is lit.

Injection valve will open automatically with a LOCA signal present and the permissive satisfied.

85
Q

E22 - HPCS

Describe how the HPCS pump works during the following:

LOOP
LOCA
LOOP with LOCA

A

During LOCA, pump will start 10 seconds after signal is received. This is to prevent overloading the LH-1-A xfmer.

During a LOOP, with a LOCA signal present and the pump online, the breaker for the HPCS pump will ride the bus and restart immediately upon restoration.

During a LOOP and a LOCA signal occurs, the pump will immediately restart upon restoration of power to the bus UNLESS power is not restored within 14 seconds, at which point it will follow the 10 second logic.

86
Q

E22 - HPCS

The HPCS pump & HPCS injection valves can be overridden.

When are these overrides functioning?

What is the difference between the pump & injection valve override logic?

How is the override reset?

A

These overrides can be implemented any time with a LOCA signal present.

The pump override logic will reset on a loss of power to its bus. The injection valve logic will not reset on a loss of power to its bus.

These overrides are not defeated until the LOCA initiation signal is cleared & the seal-in-reset pushbutton is depressed.

87
Q

E22 - HPCS

Describe the orientation of the HPCS initiation logic circuitry.

When can HPCS signal be defeated, and how can it be defeated?

A

HPCS Logic is 4 channels of Rx Water Level & 4 channels of Drywell Pressure arranged in a series/parallel circuit that allows for high redundancy while eliminated the possibility of a single instrument failure initiating HPCS.

The signal can ONLY be defeated in a high drywell pressure condition. If level is below level 2, the override will not work.

Override by depressing seal-in-reset pushbutton.

88
Q

E22 - HPCS

The HPCS SP suction isolation valve has permissives & automatic features associated with its opening. What are these permissives and automatic features?

Can these automatic features be overridden?

A

The HPCS SP suction isolation valve requires that the test return valves to the CST be shut before it can be opened. This is to prevent the possibility of pumping the SP to the CST.

The SP suction isolation valve will automatically open under two conditions: SP Level reaches 18.4’ or CST level lowers below 98,000 gallons.

These automatic open features can be defeated by taking the SP suction isolation to close once the valve has fully opened.

89
Q

E22 - HPCS

The HPCS CST suction isolation valve is normally open, and the preferred source for LOCA initiation.

What automatic features exist with this valve?

A

The CST suction isolation valve will open on a LOCA signal if the valve is closed and the SP suction isolation is closed. If the SP suction isolation is closed, it will not open.

If the SP suction isolation is closed, the CST suction isolation will automatically open ONLY if a LOCA signal is present.

90
Q

E22 - HPCS

The HPCS Injection valve has features associated with its automatic actuation.

What conditions will allow for the HPCS injection valve to open automatically?

If the HPCS injection valve logic is overridden, what will happen if the control switch is taken to Open when above L8 in the vessel?

If the HPCS injection valve is overridden, how does it respond to level changes in a LOCA condition?

A

The HPCS injection valve will automatically actuate itself to maintain reactor level between L2 & L8.

The valve will automatically open if a LOCA signal is present and either of the following conditions exist:
- Vessel level reaches L2
- Vessel level is below L8 & the High Water Level Seal-In reset pushbutton is depressed.

If the valve logic is overridden, the valve can be closed manually at any time, but the valve can only be opened if the high water level seal-in is not active.

The valve’s automatic features are disabled when the valve is overridden.

91
Q

E22 - HPCS

Describe the HPCS min flow logic

A

AUTO OPEN < 725 GPM && > 145#
AUTO CLOSE > 725 GPM || < 145#

92
Q

E51 - RCIC

Plant operating @ 100% power and a RCIC signal inadvertently initiates.

What automatic actions will occur when this scenario happens?

How would this scenario change if the plant was at a lower power? What else can change how this scenario unfolds?

Where does this trip signal get indication of reactor power?

Is there a way to defeat this trip signal?

A

The RFPTs & the Main Turbine will trip in 4.5 minutes from the time the RCIC signal initiated.

If power was below 95%, this trip signal would be instantaneous, and a scram would be generated on MT trip.

There is a High Power RCIC Trip Setpoint switch, if taken from AUTO to DISABLE, the switch would cause the turbine trips instantly when the RCIC signal initiates.

This trip signal derives reactor power from Turbine 1st stage shell pressure. The 95% estimate is approx. 670#.

De-energizing D1B08 (Gland Seal Compressor Bkr) will de-energize the non-divisional logic responsible for this trip.

93
Q

E51 - RCIC

List the isolation signals for RCIC.

One of the signals is only present on Division 1, which is it? What makes this signal different than all the others?

Some signals have time delays. List time delays with their associated signals.

A

RCIC equipment room High Temperature
MSL pipe tunnel high temp (29 min time delay)
RHR equipment room high temperature
High steam flow sensed upstream of F063 (8 sec TD)
High steam flow downstream of F063 (8 second TD)
Steam supply low pressure
Turbine rupture disc exhaust line pressure high
Manual

The manual signal is only present on division 1. This signal is unique in that it will only actuate on an automatic system initiation, and only if the signal is sealed in.

94
Q

E51 - RCIC

How will the RCIC system respond to a RCIC turbine trip signal?

How will the RCIC system respond to a L8 signal?

A

The trip throttle valve will close, followed by the injection valves & min flow valve.

The steam admission valve will close, followed by the injection & min flow valve.

95
Q

E51 - RCIC

The RCIC steam admission valve (E51-F045) has some logic and permissive associated with its open & close signals. Describe it.

A

The F045 will only open & closed based off of Reactor level. No other signal will automatically actuate this valve. It will open on L2 & close on L8.

This valve has permissives associated with its opening. It will not open if the steam exhaust to SP valve (F068) is not open.

96
Q

E51 - RCIC

The RCIC turbine has various trips. List them, and the method in which they stop the RCIC turbine.

Which trips are active when RCIC is in remote shutdown control?

A

High exhaust pressure > 25#
Low pump suction pressure
RCIC isolation
Remote trip PB
Mechanical Overspeed

All trips will fast close the TTV except for the mechanical overspeed, which will trip the turbine locally & dump control oil.

The mechanical overspeed is the only trip active when in RSD control.

97
Q

E51 - RCIC

Most of RCICs electrical equipment is DC powered. Which valve motors are NOT powered by DC power.

A

The INBD/OTBD steam isolations
The steam supply bypass (for warming up the line)
The Exhaust Vac Bkr INBD/OTBD isolations

98
Q

E51 - RCIC

Describe the min flow logic for the RCIC min flow valve

Describe the logic for the RCIC injection valve

A

Min Flow
AUTO OPEN < 120 gpm && > 125# discharge pressure
AUTO CLOSE > 180 gpm || TTV or F045 shu

Injection
AUTO OPEN RCIC Initiation && F045 Open && TTV Open
AUTO CLOSE F045 closed || TTV closed

99
Q

E51 - RCIC

Describe the interlocks between the RCIC SP & CST suction isolation valves.

Which valve can be overridden? When will its override clear?

A

CST suction isolation valve is the preferred source & normally lined up.

If SP level reaches 18.4’ or CST level lowers below 98,000 gallons, the SP suction isolation will open.

If the SP suction isolation reaches full open, the CST suction isolation will close.

The CST suction isolation does not respond to changes in CST level or SP level. It will auto close if the SP suction isolation full opens, and auto open if there is a RCIC initiation signal & the SP suction isolation is not full open.

The SP suction isolation can not open if the test return valves to the CST are open.

The SP suction isolation can be overridden. The override will clear once the RCIC initiation signal clears.

100
Q

E31 - Leak Detection

Explain the pump out & fill timers associated with Floor & Equipment drain sumps.

A

Fill Timer
Starts when pump stops. If pump stops before timeout, alarms.

Pump Out Timer
Starts on pump timer. If pump still running when timeout, alarms.

101
Q

E31 - Leak Detection

Describe the isolations for the Cont/Dw FD/EQ sumps.

What cools these sumps?

A

Sumps isolate their drains on a L2 or 1.68# signal.

NCC isolates to them on a L1 or 1.68# signal.

102
Q

E31 - Leak Detection

Explain how the ECCS Leak detection system works for each division of ECCS

A

DP is sensed between divisional ECCS lines (RHR A & LPCS for Div 1, RHR B & C for div 2), and between HPCS line & pressure above core plate for div 3.

If the DP sensed is outside of the allowed band, OOS alarms for the applicable systems will actuate.

103
Q

E31 - Leak Detection

List the allowable leakage criteria according to tech specs.

A

No pressure boundary leakage - Modes 1 - 3
< 5 GPM total unidentified leakage - Modes 1 - 3
< 30 GPM total leakage rate averaged over previous 24 hours - Modes 1 - 3
< 2 GPM total leakage rate increase over previous 24 hours - Mode 1

104
Q

G33 - RWCU

List RWCU isolations & which valves isolate.

A

Isolation Signals
L2 (130”)
SLC initiation
High delta flow ( >59 GPM for 10 mins)
Loss of Power E31
Hi RWCU Room Temps (Pump, HX, and F/D rooms)
Hi Steam Tunnel Temp
NRHX Demin Outlet Temp (140F)

IB/OB IVs for the following:
Suction line to pumps
Pump discharge line into HXs (Pumps are outside of Containment)
Blowdown to Main Condenser/RW Line
Return path to Feedwater inlet piping

105
Q

G33 - RWCU

What limitations exist on utilizing the blowdown lines for RWCU?

A

Both valves should not be used simultaneously. If done, will break vacuum in the Main Condenser and potentially damage the Waste Collector Tank

106
Q

G33 - RWCU

The blowdown control valve has an automatic feature that causes it to close. What are the set points of this feature & the basis of them?

A

Will automatically close @ > 5 psig to prevent a leak from vacuum draining the system.

Will automatically close @ > 140 psig to protect downstream piping not rated for high pressure.

107
Q

G33 - RWCU

During normal RWCU operation, what is the nominal flow band? How does this band change when the system loses one pump?

A

Nominal flow band 360-420 gpm
With loss of one pump, 185-215 gpm

108
Q

G43 - SPMU

Describe SPMU logic (drawing or list works)

A

LOCA signal sealed in for 30 mins
  OR
SP level Lo Lo && Arm & Depress
  OR
LOCA signal in && Test Sw in Test

109
Q

D17/19 - Rad Monitors

List the inputs for the 4 vent monitors.

What automatic actuation occurs when any of these systems alarm?

U1 & U2 Plant Vents, OG Vent, and TB/HB Vent

A

Post-Accident Radiation Monitors are initiated.

110
Q

D17/19 - Rad Monitors

Many of the building ventilation systems trip their supply fans when the exhaust side senses radiation levels above a setpoint.

Which ventilation systems are they?

On which analysis do they trip?

A

Radwaste, AB, IB, & FHB vent exhaust systems all trip their supply fans.

They only trip on Gas channel

111
Q

D17/19 - Rad Monitors

There are 4 ventilation systems associated with the containment & drywell structure.

What are they? What are the trips associated with each?

A

CVDW Purge - Will annunciate Cont Evac on hi alarm and isolates on a Hi-Hi alarm.

AEGTS - Will shut sample suction and discharge valves on LOCA

Containment Atm Monitoring - Will annunciate Cont Evac Alarm

DW Atm Monitoring - Will annunciate DW Evac alarm on Hi, and isolate if on Gas Channel

112
Q

D17/19 - Rad Monitors

List trips associated with the OG Post Treat Rad Monitors

A

Hi on one channel - Shifts to treat if in Auto

Hi-Hi on Recorder - Alarm

Hi-Hi-Hi or Dwnscale - Isolates Offgas (You will have to fast reactor S/D)

113
Q

D17/19 - Rad Monitors

List trips associated with Cont Vent Exhaust Rad Monitors

A

Standard IB/OB isolations if trips on IB/OB channels.

Will also isolate CVDWP valves.

114
Q

D17/19 - Rad Monitors

List trips associated with MSL Rad Monitors

A

Trip on A or C channels results in trip of Mech Vac Pumps & closes their suction isolation valves.

IB or OB isolation logic will actuate associated Reactor Sampling NS4 isolation

115
Q

D17/19 - Rad Monitors

What activates the Post Accident Radiation Monitors?

A

Trip from associated monitored vent

BOP isolation signal starts all 4.

116
Q

C34 - DFWCS

What will cause an auto transfer from 3E to 1E control?

A

Loss of any steam xmitter
2 suction xmitters with > 5% deviation
Loss of 2 suction xmitters
Loss of recirc flow signal on running pump

117
Q

C34 - DFWCS

DFWC uses 3 level xmitters as inputs for level control.

List the automatic actions associated with xmitter failures

1 failed, 2 failed, and 3 failed xmitters

A

If 1 of 3 bad, median level will omit the highest signal and utilize the two remaining signals.

If 2 of 3 bad, system shifts to manual and uses the last good reading (will not adjust and control level automatically)

With 3 of 3 bad, system shifts to manual and fails to the low end of the Narrow Range band, propogating a Level 3 signal (will get a level 3 downshift)

118
Q

M11/M13 - Cont & DW Coolers

What system cools the Cont & DW AHUs?

What signals isolate them?

A

Containment AHUs cooled by CVCW
CVCW is isolated on a BOP isolation signal.

DW AHUs are cooled by NCC. NCC is isolated on an RHR LOCA signal

119
Q

M11/M13 - Cont & DW Coolers

How do DW AHUs respond on a loss of power?

A

Fans are diesel backed and will transfer to their associated diesel backed 480v bus.

Coolers will fail to the B coils on a loss of power.

On a loss of power, the fans will trip and the coolers fail to B coil. Once power is restored by the diesel, fans will start and DW cooling will be restored.

120
Q

M11/M13 - Cont & DW Coolers

List the atmospheric tech spec & design limitations (pressure & temperature)

A
121
Q

M14 - CVDWP

How does CVDWP operate while in intermittent mode?

A

In intermittent mode, the DW supply fans are not operating.

A containment purge supply fan operates.

A CVDWP exhaust fan operates.

CVDWP exhausts to the U1 Plant Vent

122
Q

M15 - AEGTS

How does B/U Drywell Purge work?

A

Isolation valve taps in to the CGM system and sucked out by AEGTS system to treat and discharge.

This is the normal means of controlling DW pressure in Mode 1 conditions.

123
Q

M15 - AEGTS

What signals will auto-start the non-running AEGTS system?

How can you differentiate between the two?

Which starts can be overridden, if any?

A

AEGTS auto-starts on RHR LOCA or Low Flow Auto Start ( < 1500 CFM)

Easy way to differentiate is that the Electric Heating Coil will not start on a Low Flow auto-start.

Either start can be overridden off, but if the low flow condition still exists the auto-start will reinitiate as soon as the control switch is released from STOP position (it is spring returned to auto).

124
Q

M15 - AEGTS

How is the electric heating coil overridden on an RHR LOCA signal?

A

EHC can not be overridden, but it will automatically shut off when fan is shut off.

125
Q

M15 - AEGTS

How does AEGTS respond to an RHR LOCA signal?

Where does the AEGTS system exhaust to?

A

Fans will start (if not running automatically), EHC will start, system will begin processing in full exhaust.

A AEGTS exhausts to U1 Plant Vent

B AEGTS exhausts to U2 Plant Vent

126
Q

M16/M17 - Vac Breakers

Explain how the Cont and DW vac breakers work.

Which isolation signal do these respond to, and how do they respond to it?

A

DW Vac Breaker MOVs are normally closed and will open when a vacuum condition exists in the DW. They will remain open until an operator closes them.

Cont Vac Breaker MOVs are normally open and will cycle closed in an overpressure condition, and cycle open when a vacuum exists.

Both systems will isolate on a BOP isolation. They will override their isolation signal when vacuum conditions exist and follow their normal logic.

127
Q

M16/M17 - Vac Breakers

What are the tech spec requirements for Vacuum Breaker operability and position?

A

Drywell
Two shall be operble.

Containment
Three shall be operable & four shall be closed.

Modes 1, 2, & 3
RIF For containment vac brkrs

128
Q

M25/26 - CR Vent

List the operation status of the CR vent fans in each mode and their flowrates.

A
129
Q

M25/26 - CR Vent

List the trips of the CR vent trains.

Which trips are bypassed and when are they bypassed?

A

Loss of power to any train fan
Loss of control power to any train fan
Loss of flow on any running fan in train

Last two are bypassed during LOOP, RHR LOCA, & High Rad

130
Q

M25/26 - CR Vent

What signals cause a CR vent shift to emergency recirc?

When an initiation signal is overridden, how will CR vent respond to another intitation signal?

A

RHR LOCA, LOOP, High Gas Rad

If the signal is overridden, it will still shift to Emergency Recirc if one of the other signals comes in.

131
Q

M25/26 - CR Vent

How does CR Vent respond to the following ONIs:

ONI-C61 Evac of CR
ONI-D17 High Rad Levels in Plant
ONI-P52 - Loss of IA
ONI-R25-2 Loss of Non-Essential 120v Bus

A

ONI-C61
The system starts on high gas alarm on CR Rad monitor, this is an entry condition to ONI-C61

ONI-D17
High rad signals can cause the CRER system to automatically start

ONI-P52
If no bypass signal present (LOOP, LOCA, High Rad), damper will reposition to Emergency Recirc mode and trip the running train.

ONI-R25-2
If both K-1-A & K-1-N have lost power, the system will shift to emergency recirc due to loss of signal from CR Rad monitor

132
Q

M36 - OG Vent

What discharges into OG vent system?

Which areas of the plant are vented into the OG vent system?

A

Hoggers, OG final discharge, OG Hydrogen analyzer, & steam packing exhauster.

OG Holdup Pipe, SJAE areas, Turbine sampling hood, Cond F/D areas, & the OG building

133
Q

M51 - CGMC

What are the four systems used for hydrogen control?

Hydrogen analyzers are used to determine H2</sup> concentration, what areas does it sample?

A

BUDWP
Hydrogen Recombiner
CGM compressors
Hydrogen Ignitors

Drywell dome
Containment dome
Drywell head
Above SP

134
Q

M51 - CGMC

What is the normal operating temperature band for the Hydrogen recombiners?

What is the power & temperature limits of the recombiners?

At what hydrogen concentration must they be shutdown? Why?

A

1225F - 1400F

75kw or 1400F

At 6% hydrogen concentration they must be shutdown to prevent overheating.

135
Q

M51 - CGMC

What CGM compressor trips are active during LOCA conditions?

A

RHR Breaker open (no cooling supply)
RHR Cooling supply valve < 90% open (no cooling supply)
Compressor discharge outlet < 90% open (no discharge path)

136
Q

M51 - CGMC

How many hydrogen ignitors exist per division?

How many are required for the division of ignitors to be operable?

A

52 in Div 1, 50 in Div 2

> 90% of ignitors in a division must be operable.

137
Q

M51 - CGMC

Div 1 ignitors are online providing hydrogen control in containment and drywell when power is momentarily interrupted.

Power is restored, what is the status of the Div 1 hydrogen ignitors?

A

The ignitors are de-energized after power restoration.

This precludes starting of ignitors if hydrogen concentration is outside of its limits.

138
Q

M51 - CGMC

List the requirements for each hydrogen control system operability & the actions required when not met.

Where does each requirement live?

A

Ignitors
Two subsystems operable, with >90% of ignitors in each subsystem operable.

If they are both inoperable, verify hydrogen control by alternate means within 1 hour
Both recombiners & Both CGM Compressors

T.S 3.6.3.2

CGM Compressors
Two subsystems shall be operable.

If both inoperable, verify hydrogen control within 1 hour
One recombiner or one division of ignitors

T.S 3.6.3.3

Hydrogen Recombiners
Two subsystems shall be operable.

If both inoperable, verify hydrogen control within 1 hour
One division of ignitors

ORM 6.4.12

139
Q

N21 - Condensate

List trips associated with CBPs & HWPs
List permissives associated with each pump.

How much capacity can each pump provide?

A

CBP
Turbine Trip
UV/OC
Requires LO pressure > 6# to start

HWP
UV/OC
Required to be running in order to open the N21-F245 (Min Flow Valve)

Each set of pumps are 50% capacity/pump.

140
Q

N21 - Condensate

What is 3 Element control in regards to the HST?

When is 3 element control not used?

A

HST level, N27 Feed Flow, & Condensate Flow

Not used below 25% or in long cycle cleanup.

141
Q

N21 - Condensate

List the Condenser Vacuum trip setpoints

A

5.6” HgA - Load Set Runback, Rx Recric FCV Runback
8.1” HgA - Main Turbine Trip
11.5” HgA - RFPT Trip
20” HgA - Bypass Valves close
21.5” HgA - MSIVs close (MS in Run only)

142
Q

N22 - Steam Drains

How do steam drains fail on a loss of power?
What about for loss of air?

A

They all fail open on loss of power or air except for the N22F420A-D which fail closed. (The drains right before the MSSVs)

143
Q

N22 - Steam Drains

Explain how the MSSV before seat drain setup works.

A

Normally root valve (F420A-D) is open. The drain valve downstream (F450A-D) will close when steam flow is > 50% rated TSF as indicated by C34. These valves open when flow is < 50% TSF.

144
Q

N22 - Steam Drains

Which steam drains automatically open after a Main Turbine Trip?

A

Everything downstream of the MSSV before seat drains (does not include the MSSV before seat drains)

145
Q

N22 - Steam Drains

List the 4 categories of steam drains

A

Main Steam Line Drains
Reheat Steam Drains
Extraction Steam Drains
Misc Steam Drains

146
Q

N27 - Feed System

What will cause the C34 system to see a RFPT as available?

A

No low hydraulic header pressure trip signal
&
Discharge valve > 90% open

147
Q

N27 - Feed System

What is the low speed stop for a RFPT & what is the discharge pressure associated with this speed?

A

3300 RPM & 825#

148
Q
A

ILO24 (17 decks)

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