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Systems > Test 5: RWM, RBM, NIs, SW, TB HVAC, Recirc, VFD, CRD, RMCS > Flashcards

Test 5: RWM, RBM, NIs, SW, TB HVAC, Recirc, VFD, CRD, RMCS Flashcards

1
Q

Recirc ratio

A

6.03:1

Total core flow/total steam flow

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2
Q

RR Pump discharge valve (F031) and discharge bypass valve (F032) interlocks

A

Auto close: LPCI signal and <310#

Will trip running RR pump if F031 <90% open w/ F032 not full open

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3
Q

RR Pump suction valve (F023) interlocks

A

Must be full open to start pump

Trips running pump if <90% open

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4
Q

Reactor Sample valves F019/F020

A

Group 1: LL3 or Low Condenser vacuum 10”

Fail closed on loss of PNS or RNA

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5
Q

Loss of RBCCW and/or loss of CRD actions for RR pump

A

Loss of RBCCW: Restore or secure pump in 10 min

Loss of CRD and RBCCW: Secure pump in 90 sec

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6
Q

What pressure range should be minimized for RR pumps

A

250-400#

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7
Q

RR Pump temperature starting requirements

A

Temps must be taken within 30 min of start
1 Idle Loop: <= 145F between Rx top and bottom, <=50F between loops, and <=50% flow on operating loop (U1: 23,500 gpm, U2: 24,500 gpm)
2 idle loops: <= 145F between Rx top and bottom, <=50F between loop and vessel

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8
Q

Loop flow mismatch limits

A

<75% flow: <= 10% mistmatch

>=75% flow: <=5% mismatch

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9
Q

RR Pump ICB trips

A
  • Suction valve <90% open
  • Disch valve <90% open w/ bypass not full open
  • Overcurrent
  • Overfrequency
  • Undervoltage
  • ATWS
  • RTGB E-Stop
  • RTGB ICB Open
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10
Q

Manual runback setpoints

A

70% power
U1: 52% speed U2: 54.8% speed
47 mlbm/hr

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11
Q

Limiter 2 setpoints

A

56% flow
U1: 45% speed U2: 48% speed
-Level <182” AND either RFP suction flow <14.9%

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12
Q

Limiter 1 setpoints

A

34% speed

  • Discharge valve <90% open or total feed flow(DFCS) <16.4% for 15 seconds
  • Full SCRAM from B/U SCRAM logic on U2
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13
Q

Loss of 480V E-Bus runbacks

A

1 RFP in service: Divisional RFP will Runback to Limiter 2 then Limiter 1 after 14 seconds
2 RFP in service: Divisional RFP will Runback to Limiter 1 in 15 seconds

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14
Q

VFD Raise/Lower setpoints

A

Slow: 1 rpm
Medium: 5 rpm
Fast(lower only): 50 rpm

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15
Q

How many VFD cells can be bypassed

A

3 total, no more than 2/phase

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16
Q

Jet Pump failure indications

A

MW lower
CTP lower
Core Plate D/P lower
Flows rise

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17
Q

RR Flow inputs to APRMs

A

A and B loop both input into each APRM
APRM 4 provides Discharge Flow indications
APRM 1 provides Recirc Flow indication

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18
Q

RWM design basis

A

ensures peak enthalpy <280 calories/gram during rod drop. Required to be operable <= 8.75% power

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19
Q

LPAP and LPSP

A

LPAP: 27.7% power (DFCS steam flow)
Transition Region: Errors displayed, no blocks. Critical Self Test or RPIS failure will still give blocks in TR
LPSP: 19%

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20
Q

Where can you Bypass RWM from

A

OD @ RTGB

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21
Q

RWM test mode

A

OD @ RTGB

must have all rods inserted or one rod out and selected

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22
Q

Where can you INOP RWM

A

CD @ backpanels

Will give you a Rod Block unless RWM is BYPASSED

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23
Q

Where can you Bypass a Rod

A

CD @ Backpanels
Only while in INOP mode
Can bypass up to 8 rods
RWM is considered INOP with a rod bypassed

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24
Q

RWM power supply

A

UPS via V9A(10A) and V7A(8A)

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25
Q

Rod positions substitutions

A

Can substitute up to 8 rod positions @ OD

Substitution is removed when rod is moved and picks up a good reed switch

26
Q

Inferred positions

A

No operation rod motion:
Last known position even, offer that position
Last know position odd, offer no position

Operator driven motion:
Last known position odd, offer next even in direction of travel
Last know position even, offer no position

27
Q

Rod select error

A

Insert and Withdraw block applied

28
Q

How many notches can you go past allowed sequence

A

> 2 notches past will deselect rod and extinguish rod matrix light
1 notch past can be corrected

29
Q

SRM requirements to move a control rod

A

Must have a SRM in the same quadrant and adjacent quadrant to move a control rod in that quadrant

30
Q

Describe a SRM detector

A 
Ion chamber U3O8
600 vdc 
213# argon
Full in: 18" above core centerline
Full out: 24" below fuel
Can be positioned anywhere
31
Q

Purpose of SRM log count rate amp

A

drives meters/recorders/alarms/trips

32
Q

Purpose of Period Amp

A

Drive period meter/alarm

33
Q

SRM/IRM power supplies

A

Detector/meter/alarm circuits: 24 vdc
Recorders:
Drive motor: 120vac AB-RX

34
Q

SRM upscale trip

A

5x10^5 CPS (Alarm and SCRAM if shorting links removed)

Bypassed: IRMs >= Range 8 or Mode Switch in RUN

35
Q

SRM upscale alarm

A

2x10^ 5 CPS (Alarm and Rod Block)

Bypassed: IRMs >= Range 8 or Mode Switch in RUN

36
Q

SRM INOP trip

A

SOO MU HVL (Alarm and Rod Block)

Bypassed: IRMs >= Range 8 or Mode Switch in RUN

37
Q

SRM retract permit

A

<100 cps (Alarm and Rod Block)

Bypassed: IRMs >= Range 3 or Mode Switch in RUN or SRMs full in

38
Q

SRM downscale trip

A 
5 cps (Alarm and Rod Block)
Bypassed: IRMs >= Range 3 or Mode Switch in RUN
39
Q

SRM short period

A 
50 seconds (Alarm only)
Bypassed: Only with joystick
40
Q

IRM operability

A

Must have 3 IRMs per division

41
Q

Describe IRM detector

A

U3O8
100 vdc
17# argon
Full in (18” above core CL), Full out (24” below fuel), and any intermediate position

42
Q

How does an IRM eliminate gamma signals

A

Mean Square Analog

Gamma discrimination by Cambelling (36:1)

43
Q

IRM upscale trip

A

117/125 (Alarm, 1/2 SCRAM, Rod Block)

Bypassed: Mode Switch in RUN

44
Q

IRM upscale alarm

A

70/125 (Alarm and Rod Block)

Bypassed: Mode Switch in RUN

45
Q

IRM INOP trip

A

SOO MU HVL (Alarm, 1/2 SCRAM, Rod Block)

Bypassed: Mode Switch in RUN

46
Q

IRM downscale

A

6.5/125 (Alarm and Rod Block)

Bypassed: Range 1 or Mode Switch in RUN

47
Q

IRM Detector not full in

A

Rod Block

Bypassed: Mode Switch in RUN or detector full in

48
Q

Describe LPRM changes over core life

A

Output from neutrons decreases due to Uranium depletion (adjusted with gains)
Output from gammas is steady (based on Argon pressure)

49
Q

LPRM power supplies

A

RPS

50
Q

LPRM alarms

A

downscale 3/125

upscale 104/125

51
Q

APRM NUMAC power supply

A

Both RPS bus to each NUMAC

52
Q

LPRM operability

A

<17 LPRMS per APRM or <3 per level (A,B,C,D)

Alarm and INOP per Tech Specs

53
Q

APRM SCRAM setpoints

A

Hi Flux: 117.4%
TLO Flow Biased: (.55)W+61.1 Clamped at 115.8%
SLO Flow Biased: (.55)(W-20.5)+61.1
Hi Flux Setdown: 15% with MODE Switch not in RUN
INOP: SOO MU HVL, Critical Fault, Watchdog timer timed out

54
Q

APRM Rod Blocks

A

Hi Flux: 108% STP
TLO Flow Biased: (.55)W+53.5 Clamped @ 108
SLO Flow Biased: (.55)(W-20.5)+53.5
Hi Flux Setdown: 12% STP Mode Switch not in RUN
INOP: SOO MU HVL, Critical Fault, Watchdog, Too few LPRMs,
Total Recirc flow hi: 110%
Downscale: 2.4%

55
Q

GAF = ?

A

Actual thermal power/STP

Should be <=1

56
Q

When are OPRMS enabled?

A

<60% total recirc flow and >25% STP

57
Q

How many OPRM cells are there and what’re the operability requirements?

A

24 cells
Need >= 2 LPRM strings per OPRM cell to be operable
Need >= 18 cells for OPRMs to be operable

58
Q

Which OPRM algorithm is require per tech specs and describe it

A

Period Based Detection Algorithm (PBDA)
Monitors size of peaks and valleys in a time frame and the frequency of oscillations. Alarm at 6 counts, trip at 15 counts w/ amplitude > 1.13

59
Q

Purpose of RBM

A

Prevents fuel damage at power due to local power increase caused by a single rod withdrawal error. Provides withdraw blocks only

60
Q

RBM inputs

A

Uses the B,C, and D level LPRMs for the LPRM strings surrounding the control rod being withdrawn

61
Q

When is the RBM bypassed

A

Automatically when a peripheral rod is selected
Automatically if reference APRM <= 27.7%
Manually with joystick

62
Q

What will INOP RBM

A 
SOO MU Too Few >1 Critical Dog
Switch in INOP
Too few LPRMS (<1/2 of required)
Critical self test fault
Watchdog
Loss of input power
More than one rod selected

Will get a Rod Block unless bypassed

Systems (6 decks)

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