Systems Review Flashcards
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?
- SRIA
- LPCS -> 145#, RHR -> 125#
- LPCS -> 450#, RHR -> 280#
B21 Highlights - ADS
Draw ADS Logic
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?
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
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?
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.
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?
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
B21 Highlights - MSIVs
MSIV Closure Signals
How does MSL isolation work?
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.
B21 - NS4
List all of the NS4 isolations & their setpoints.
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”
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&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.
B21 - NS4
RHR A is in use for SDC & a loss of B RPS occurs. What happens to SDC?
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.
B21 - NS4
Which system isolations are not effected by NS4?
RHR LOCA & RCIC Isolations
B21 - NS4
Which systems have BOP isolations?
Which systems are capable of overriding their isolation signal with no operator input?
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.
B21 - NS4
What valves isolate during an RHR SDC isolation?
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).
B33 - Recirc
What are the indications of a failed jet pump?
What are the hazards associated with a failed jet pump?
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.
B33 - Recirc
What are indications of Recirc Pump seal failure?
What indication(s) on Recirc Pump parameters require an immediate pump trip?
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.
B33 - Recirc
What are the Recirc pump downshifts?
What are the bases for them and when are they bypassed?
How are these trips provided?
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.
B33 - Recirc
What are the Recirc pump trips?
What are the bases for them and when are they bypassed?
How are these trips provided?
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.
B33 - Recirc
How do RCP behave when starting in fast and slow?
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.
B33 - Recirc
What are the auto shifts and trips for FCV HPUs?
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
B33 - Recirc
What conditions cause a FCV runback?
What happens?
What if the FCV is already closed further than its runback position?
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.
B33 - Recirc
This card is reserved for shit about the AFDL which I have shit knowledge of.
Look here in the future for better stuff.
C11 - CRDH
Draw or Explain flow path for CRDH system.
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?
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.
C11 - CRDH
What happens to the CRD Pumps during a LOOP?
LOCA?
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.
R10
List loads on the L10 Bus
CW Pump C
MFP
Interbus LH-1-A
S/U supply to L11
S/U supply to L12
R10
List loads on the L11 Bus
CW Pump A
B33 Recirc Pump A (Fast)
Interbus LH-1-B
LF-1-A/C/E/H
(ACEHOLE)
R10
List loads on the L12 Bus
CW Pump B
B33 Recirc Pump B (Fast)
Interbus LH-1-C
LF-1-B/F/D/G
R10
List loads on the H11 Bus
RFBP A/C
CBP A/C
HWP A
CVCW Chiller A
TBCW Chiller A
LFMG A
SY Load Center
R10
List loads on the H12 Bus
RFBP B/D
CBP B
HWP B/C
CVCW Chiller B
TBCW Chiller B
LFMG B
U1 SA & IA Compressors
SW Pump A
R10
List loads on the XH busses
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
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”?
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.
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?
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.
C11 - RCIS
What parameters does the RGD Cabinet monitor?
Scram valve positions, SRI switch positions, and HCU status.
C11 - RCIS
List the rod blocks associated with SRMs, IRMs, and APRMS
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%
C11 - RCIS
List the rod blocks not associated with Nuclear Instruments, and when they are bypassed.
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?
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
C41 - SLC
What is SDM?
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.
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?
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.
C41 - SLC
What NS4 isolation occurs when SLC is initiated?
How is this isolation input?
G33 - RWCU isolation occurs when SLC is initiated.
The isolation is interlocked to both SLC keylocks. Initation of either division will cause the isolation.
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?
43 GPM each at 1250#
Trips on 200 Gal SLC tank level
Suction valve full open.
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?
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.
C41 - SLC
How does heat trace play in to SLC system?
What are the SLC system temperature requirements for operability?
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.
C51 - RPS
Count rates for SRM operability?
How is signal to noise ratio calculated?
≥ 3.0 CPS or
≥ 0.7 CPS with a signal to noise ration ~2:1.
Count rate full in vs count rate full out.
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?
Scram Valves - De-Energized
B/U Scram Valves - Energized
ARI Valves - De-energized
C51 - RPS
What is required for APRMs to be operable? (Logic and Administrative)
What else can make an APRM inoperable?
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.
C51 - RPS
APRM Recirc Flow unit, what is the calculation of this trip and what is the basis?
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.
C51 - RPS
What are the APRM rod blocks and scram signals?
C51 - RPS
What are the IRM rod blocks and scram signals?
C51 - RPS
What are the SRM rod blocks and scram signals?
Why will the SMR scram signals never occur?
SRM scram signals are bypassed with shorting links.
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?
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.
C51 - RPS
What are the three factors monitored by OPRMs?
Which one is credited in safety analysis?
Period, Amplitude, and Growth.
Only period is credited.
C51 - RPS
AFDL in control alarm immediate actions
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.
In the below PF map, what are the bases of each identified line?
C61 - Remote Shutdown
What is the purpose of the RSD system?
What parameters does the RSD system allow for control of?
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.
C61 - Remote Shutdown
Which components can be controlled on the Remote S/D panels without taking remote control?
INBD MSIVs
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?
E12-F006B, E12-F009 (Div 2 valves for SDC)
Inboard MSIVs.
C61 - Remote Shutdown
Most interlocks are removed when RSD is in control. What interlocks are still functional?
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)
C61 - Remote Shutdown
How does SDC change in RSD?
SDC uses the LPCI injection line rather than the feedwater sparger.
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?
RCIC does not autostart when RSD is in control.
Support systems will not autostart.
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?
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.