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Pirtle NRC PREP > Important Systems > Flashcards

Important Systems Flashcards

1
Q

How long are the 250 VDC Plant Batteries expected to last during a Loss of Off-site Power?

A

3 hours

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2
Q

How long are the 250 VDC Plant Batteries expected to last during a Station Blackout?

A

4 hours

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3
Q

What are the bus and Trains for the CRIDs?

A

CRID 1 - C
CRID 2 - D
CRID 3 - A
CRID 4 - B

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4
Q

What is the normal power supply to the CRIDs?

A

250 V DC

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5
Q

What are the autostarts for the MDAFPs?

A

Both MFPs Trip (w control switch in auto)

AMSAC

Loadshed

Lo-Lo SG Level (1 SG)

SI

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6
Q

What are the TDAFP Auto Stared?

A

Undervoltage on RCP Bus

SG Lo-Lo (2 SGs)

AMSAC

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7
Q

What does the AMSAC Signal do?

A

Trips the Turbine and Starts all AFW pumps

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8
Q

What are the 3 autostarts of the CCW Pumps?

A

SI

Loadshed

Low discharge pressure (80#)

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9
Q

On an SI, what flow do the RHR Hx CCW Outlet valves throttle to?

A

3000-3500 gpm

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10
Q

What CCW Systems isolate on a Phase A?

A

SFP Hx

Excess LD

Rx Support Cooler

NBAE

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11
Q

What are the ESF Loads for CCS?

A 
RHR Hx
RHR pp Seal Hx
CTS pp Seal Hx
SI pp LO 
SI pp Seal Hx
CCP LO Cooler
CCP Speed Increaser
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12
Q

Does the control air compressor have a loadshed trip?

A

No

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13
Q

What are the key pressures of the plant and control air systems?

A

100 # - Normal

95# - Standy PAC Stars

90# - CAC Starts (sensed in wet air receiver)

85# - PA Hdr Isolation Valves Close

80# - Manual Trip

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14
Q

What signal stats the CTS Pumps?

A

Phase B

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15
Q

What signal opens the CTS Pump Discharge valves and the SAT Outlet Valves?

A

CTS Signal

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16
Q

What are the key levels and associated actions of QLC-451 for the VCT?

A

2.5% - Low-Low Alarm and half RWS signal

14% - Auto Makeup Starts + Low Alarm + MU Not in Auto Alarm

24% - Auto Makeup Stops

87% - Divert Trips Open + High Alarm

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17
Q

What are the key levels and associated actions of QLC-452 for the VCT?

A

2.5% - VCT LO-LO Alarm + 1/2 of RWS signal

7% - Low Alarm

78% Divert Starts

87% Divert Stops

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18
Q

WHat happens in the SVCS on a SI Signal?

A

Charging Hdr Iso Valves Close
CCW to LD Hx Closes
CCP Recircs Close and throttle based on pressure

CCP Suction realigns to RWST

BIT Valves Open

CCP Starts

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19
Q

What is the pressure input for QMO-225, East CCP ELO?

A

NPP-155

1812-1825#

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20
Q

What is the pressure input for the West CCP ELO?

A

NPP-153

1812-1825#

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21
Q

What is the ECCS Acceptance Criteria?

A

Peak Clad Temp - < 2200*F

Max Cladding Oxidation - < 17%

H2 Generation - < 1%

Core maintains a coolable geometry

Long term abundant cooling

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22
Q

What are the EDG Trips when needed for a SI or a LOOP with 250 VDC available?

A

Generator Phase Differential

Electronic Overspeed

Manual Push Button

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23
Q

What are the EDG Trips without 250 VDC available?

A

Manual Fuel Valve on the Worthington module

Mechanical Overspeed

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24
Q

If the EDG Electronic governor fails high, what happens?

A

EDG Speed will rise and machine will be controlled by the mechanical governor eventually

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25
Q

What is the status of the EDG during surveillance testing and why?

A

Inoperable bc it will not generate a loadshed signal

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26
Q

What happens if control air is lost to the EDG?

A

Throttle control cycle deer extends, forcing the fuel racks closed

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27
Q

What is the normal status of breaker BD?

A

OPEN

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28
Q

125 VDC supplies what?

A

Breaker / control power for the switchyard. EACH YARD HAS ITS OWN 125 VDC SUPPLY

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29
Q

What is TR-12-EP-1 designed to handle?

A

CTS in 1 unit and SBO in both units

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30
Q

What is the SDG sized for?

A

1 train of RCS Inventory Control in 1 unit

ESW, CCW, CCP, AFW, NESW, CAC

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31
Q

What does the anti-pumping circuit do?

A

Prevents breaker from attempting a second closure w a standing close signal when the first attempt was followed by a trip open signal

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32
Q

Explain degraded bus voltage.

A

2/3 T busses sensed 113 V (ONLY sensed on A + D busses)

9 sec delay w SI / SG LO-LO opens T buse feeders

+ 90 sec auto transfer to RATS

+21 secs open T bus Feeders

Train Specific

Opens BOTH RCP Bus Ties for associated train

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33
Q

Explain Load Shed (UV)

A

2/3 sensed on EACH T-bus @ 94 (93) volts

2 second delay and bus specific

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34
Q

What are the ESW pump auto starts

A

SI (either unit, train specific

Load shed

Low hdr pressure - 40# (auto only)

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35
Q

What do the ESW from CCW Hx valves throttle to on a SI

A

~5500 gpm

Adjustments can be made after the valves throttle if necessary

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36
Q

What do the instrument power fuses power? When do they trip?

A

Instrument Power Supplies

Always trip unless bypassed or blocked

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37
Q

What do Control Power fuses power? And when do they cause a trip?

A

Bistables

Always unless blocked

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38
Q

What happens if your IR Detector is undercompensated?

A

Gives a false High Indication. Can cause IR current to stay above the P6 setpoint when coming down in power, which will prevent the SR Detectors from Auto energizing

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39
Q

What are the normal parameters of the PRT?

A

100*F

83% Level

3 #

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40
Q

PORV Cold Overpressure: NRV-152 is controlled by?

A

NPS-122 (Loop 1 WR)

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41
Q

When do the PRZ Backup Heaters trip?

A

Loadshed

PRZ Low Level at 17% (hot cal)

Over current

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42
Q

What is the PRZ Pressure Safety Limit?

A

2735 psig

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43
Q

What happens if a PRZ Level Control Channel Fails Low?

A

QRV-251 throttles open to increase level

LD Isolates (QRV-112 + all orifices)

PRZ Htrs Off

Rx Trips at 92%

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44
Q

What happens if PRZ Level Bistable channel fails Low?

A

LD Isolates (QRV-111)

PRZ Htrs Off

PR Pressure Decreases due to heaters being off

Actual level increases, charging to min

Rx Trips at 92%

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45
Q

What happens if the PRZ Level control channel fails high?

A

QRV-251 throttles closed to lower level

PRZ Htrs com on (+5% deviation)

Actual Level decreases and at 17%, Orific isolation valves close, QRV-111 closes, and heaters turn off

Actual Level increases (min charging w no let down)

Rx Trips at 92%

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46
Q

What happens if PRZ Level Bistable channel fails high?

A

NOTHING!

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47
Q

What happens if PRZ Pressure Controlling channel fails high?

A

All PRZ Htrs Off

Sprays full open

1/2 signal for NRV-152 present

Actual PRZ Pressure decreases

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48
Q

WHat happens if PRZ Pressure Controlling channel fails low?

A

Backup eaters in auto will turn on

Cycling Htrs full on

Actual PRZ Pressure rises

NRV-152 is inoperable

If channel 3 was in control. ALL PORVS inoperable

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49
Q

What happens if the PRZ Pressure bistable channel fails high?

A

1/2 actuation signals present for NRV-151 and 153 present

50
Q

What happens if the PRZ Pressure bistable channel fails low?

A

NRV-151 + 153 inoperable

If channel 4 was the bistable, then ALL PORVs are inoperable

51
Q

What are the RCP Power supplies?

A

1 - B

2 - C

3- D

4 - A

52
Q

Assuming 8 gpm Seal Injection, what is the seal injection flowpath?

A

5 gpm flows down RCP Shaft into the RCS

3 gpm flows up thru #1 seal

3 gpm flows up thru #2 seal

100 cc/hr flows up thru #3 seal

53
Q

What is the RCP Seal Return Flowpath?

A

1 Seal - Seal Water Hx to CCP Suction

54
Q

What is used for the Subcooling Meter Calc?

A

Auctioneered HI CETCs or WR RTD Temps

Auctioneered LO RVLIS Pressure (used bc outside containment)

55
Q

What are the interlocks to open ICM-305/306, RHR Suction from the Recirc Sump?

A

IMO-310, RHR Suction Valves - Closed

IMO-215, RWST to CTS Pump - Closed

56
Q

What are the interlocks to open IMO-340, RHR to CCP / SI Suction?

A

ICM-305, RHR Suction from Recirc Sump - Open

IMO-252 or IMO-263, SI Recirc to RWST - Closed

57
Q

What are the interlocks to Open IMO-330, RHR to Upper Spray?

A

ICM-305, RHR Suction from Recirc - OPEN

58
Q

What are the interlocks to open IMO-310, RHR Suction Valves?

A

ICM-305, RHR Suction from Recirc Sump - Closed

IMO-340, RHR to CCP / SI Suction - Closed

IMO-330, RHR to upper Spray - Closed

59
Q

A logic cabinet urgent failure effects which rods?

A

ALL Rods

60
Q

A Power cabinet Urgent Failure affects which Rods?

A

Groups for that specific cabinet

61
Q

Loss of redundant power to power or logic cabinets for control rods is what kind of failure?

A

Non Urgent

62
Q

How fast do rods move in auto?

A

8-72 spm

Error 1/5-3F, 8 spm

Error 3-5*F, 32 steps per degree +8

63
Q

How fast do rods move for shutdown banks in manual?

A

62 spm

64
Q

If a PR NI fails high, what is the effect on rods?

A

Power Rate of change causes rods to step in, but rod stop C2 will prevent rods from stepping back out on the temperature error in both auto and manual

65
Q

How will a PR NI low failure affect rods?

A

No effect unless affected instrument was previously the auctioneered high

66
Q

How will MPC-253 failing high affect Rods?

A

Power Rate of change and Tavg < Tref causes rods to step out

67
Q

How will MPC-253 failing low affect Rod?

A

Power Rate of change and Tavg > T ref causes rods to step in

68
Q

How will Tavg failing high affect Rods?

A

Tavg > Tref causes rods to step in

69
Q

For SSPS, loss of both 15 VDC OR both 48 VDC power supplies does what?

A

Generated Rx Trip

70
Q

CRID 1 supplies which train of slave relays?

A

A

71
Q

CRID 4 supplies which train of slave relays?

A

B

72
Q

A loss of CRIDs 1 or 4 prevents what?

A

Actuation of ESF equipment on that associated train

73
Q

For SSPS Bistable Test Switches, what does it do for the logic?

A

Gives SSPS the trip signal

74
Q

What is unique with CTS Bistables?

A

Bypassed instead of placed in test, to ensure we don’t have an inadvertent CTS

75
Q

When the RPS Bypass switches are in bypass, what happens?

A

Never get a trip signal

76
Q

Do RX Trip Bypass breakers have Shunt coils?

A

NO

77
Q

How do the Rx Trip Breakers Trip Coils work?

A

Energized to trip

78
Q

How do the Rx Trip Breakers UV Coils work?

A

De-Energized to Trip (48 VDC from SSPS)

Do NOT Need control power

79
Q

How do the Rx Trip Breakers Shunt Coils work?

A

Energize to Trip

80
Q

What are the inputs for OT delta T?

A

Delta T

Tave

AFD

PRZ Press

81
Q

What does OT Delta T Protect from?

A

DNB

82
Q

What are the inputs for OP delta T?

A

Delta T

Tave

83
Q

What does OP delta T protect from?

A

KW/ft

84
Q

What is the turbine trip / load rejection steam dump controlled based on?

A

Auctioneered high Tavg

85
Q

What is C-7A?

A

10% load rejection on MPC-254

86
Q

What is C-7B?

A

30% Load rejection on MPC-254

87
Q

What is C-8?

A

TT Arming Signal

4/4 MT SV Closed

OR

2/3 Oil Pressure switches below 800 psig

88
Q

What is C-9?

A

Blocking Signal:

1 CW Pump

CRID 2

3/3 Condensers >20.6” hg

89
Q

What is P-12?

A

Blocking Signal

2/4 Tavg < 541*F

Blocks steam dump until placed in Bypass Interlock

90
Q

What does Steam Dump Bypass Interlock do?

A

Allows group 1 operation below P-12

91
Q

For the TT Controller, what are the temperature differences for each group to be tripped open?

A

10*F - 1 group

20*F - 2 groups

92
Q

How many groups of steam dumps will you get maximum on a turbine trip?

A

2 groups

93
Q

How many groups of steam dumps will you get maximum on a Load Rejection?

A

3 groups

94
Q

What is C-20?

A

2/2 Turbine Impulse Pressures > 40%

95
Q

What is needed for an AMSAC Actuation?

A

3/4 FF < 25%

96
Q

What are the auto-starts for an AES Fan?

A

ECCS/CTS Pump Start

SI

97
Q

What will happen on a loss of BOTH Unit 1 AX Fans?

A

12-RRV-306 closes

98
Q

What starts the CCW Pump Fans?

A

Manual

Load Cons

99
Q

What will place the AES Charcoal Filter I/S?

A

Phase B (either Train)

AES Fan C/S in Stop (that fan only)

Loss of power to EITHER AES Fan

Loss of Control Air

100
Q

What will place the AFX Charcoal Filter I/S?

A

SFP High Rad / Airborne

Loss of power to EITHER fain

Loss of Control air

101
Q

What fans trip on Phase B?

A

CLVs

CRDM Fans

PRZ Fans

Rx Cavity Fans

102
Q

What will start ALL CRP Fans?

A

SI in either unit

103
Q

What will the CRP fan damper positions be for a cable vault fire?

A

CRAC Outside Supply 1/1A- Closed

CREV Outside Supply 2/2A- Part Open for 1, other is closed

CR Recirc 3 - Closed

104
Q

What will be affected if a PR detector fails low?

A

OTDT setpoint will lower

105
Q

Will a high rad signal place an AES Fan charcoal filter in service?

A

No. This must be done manually

106
Q

If a 1 RCS Loop flow lowers in comparison to all others, what would the result be?

A

Reactor core margin to DNB will be lower

107
Q

If the EDG Emergency Trip pushbutton is inadvertently pressed in the control room while the EDG is actually needed, how must you restart it?

A

Reset the HEA Relay in the control room

108
Q

The primary function of the Ice Condenser is to ____________ to less than the design limit following a ________ or a _______

A

Limit peak pressure

following a LOCA or a Steam Line Break

109
Q

What does the TDAFP Discharge Flow High Alarm mean?

A

AFW Flow Retention has actuated

110
Q

Where does the PRT vent to and what is the interlock?

A

Waste Gas Header

Pressure must be < 10 psig

111
Q

Why do operators care about the SAT LO-LO Level alarm during a LOCA?

A

The spray add tank outlet valves and educator supply valves may not have closed automatically. This could cause damage to the CTS Pumps due to the resulting gas addition

112
Q

Can the Backup Plant Air Compressor feed both unit’s control air headers?

A

Yes, it wil discharge to both unit’s CA Systems

113
Q

Do both reactor trip breakers and reactor trip bypass breakers have shut coils?

A

NO- Only Rx Trip Breakers do

114
Q

Is the CCW thermal barrier isolation valve common to all RCPs? Or does each have its own?

A

Common to ALL

115
Q

If CCW to the RCP thermal barrier is lost, must you trip the affected RCPs?

A

NO, as long as it has seal injection maintained

116
Q

To calculate MFP DP, what are the inputs used?

A

Highest of the low pressure (steam) and Lowest of the high pressure (FW)

117
Q

How do the RHR Hx Outlet valves (IRV-320 and IRV-310) fail on a loss of air?

A

Open!

This raises flow thru the Hx, raising the cooldown rate

118
Q

If CRID 1 is lost, what happens?

A

Train A SSPS output relays won’t work.

Manual red switches will not work to actuate SI.

119
Q

When an RCP Trips, how do Thot and Tcold respond in that loop?

A

Reverse flow causes Thot to drop to the Tcold value or slightly below

T cold remains about the same at low power

120
Q

Which CRID does NOT supply power to the Steam Dump System?

A

CRID 3

121
Q

What would cause a load cons signal to be generated for the CD EDG?

A

Train A SI with a LOOP/Loadshed

Pirtle NRC PREP (7 decks)

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