2020 NRC exam

an extinguished phase light indicates a minimum of how many RTCBs are open? how many lights must be extinguished to trip the RX?

an extinguished phase light indicates at least one RTCB is open

a minimum of two lights must be extinguished to trip the RX

A LOCA is in progress, the CRS has entered Loss of coolant accident, CTMT temp is 150F, how is adequate core cooling indicated by (minimum subcooling or maximum superheat and what temp?)

44F superheat

what conditions in CTMT allow of a 24 Subcooled as a minimum subcooling limit

24 F subcooling for an uncomplicated Rx trip

when is 60 superheat used for a maximum superheat value?

during Harsh CTMT conditions

during a LOCA RWT is at 80% and lowing at a rate of 1% every minute, when will the CR be required to shift CH pumps suctions and why?

7 minutes due to a loss of suctions at 73% in the RWT

Unit 2 is tripped due to High motor stator temp in RCP 1A, per RCP emergencies, what RCP(s) will be stopped, if any, and will this action be performed before or after reactivity control?

stop RCP 1A after reactivity control

Unit 2 is at 100% power

A and B charging pumps are running

Charging flow drops to 25%

A/O reports that A CH pump is partially gas bound and B is fully gas bound

how does a completely gas bound pump sound compared to a non gas bound pump

which pump(s) should the crew stop after securing letdown?

quieter than a normal pump

stop both charging pumps

when does the PZR low level alarm come in and when can we use CS on SDC?

25%

can use CS pump B when pressure is less than 210 PSIA and less than 185F

when cross connecting EW to NC, why do we open a normal chiller NC outlet valve?

open one Normal chiller NC outlet valve to provide additional EW flow to NC priority loads

PZR control valve 100E sticks open, all actions fail to close the valve, PZR pressure lowers to 1950 PSIA, what actions should be taken per the ARP?

trip the RX and stop all 4 RCPs to reduce DP across the main spray valve

PZR pressure begins to rise, an ATWS occurs and NO operator action is taken, when will SPS send a trip signal and what components will be tripped as a result?

trip at 2409 PSIA and trip signal is sent to the RTCBs and MG set contactors

a SGTR occurs, SG pressure should be lowered to a maximum pressure of __1__, and this is to ensure the temp of__2__ is at the required temp prior to isolating the affected SG

1) 950 PSIA

2) THOT

An unisolable ESD occurs outside CTMT is in progress in unit 1

SG1 is 920 PSIA and lowering

SG2 is 950 PSIA and stable

CRS has entered ESD

to minimize Pressurized thermal shock, stabilize TCOLD using __1__ and by __2__

1) ADVs

2) throttling closed HPSI injection valves

U1 is tripped due to a loss of MFW, AFB has been started manually and is feeding both SGs, Subsequently an AFAS-1 actuates, how will this affect current feed?

AFA should start and feed __1__ and AFB will be feeding SG(s) __2__

1) SG1 only

2) SG2 only

AFAS-1 will stop feed to SG2

what is the purpose of initiating an MSIS during a blackout?

minimize cooldown of the RCS and prevent damage to the main condenser

Unit 2 experiences a loss of PNA-D25, the crew must begin to trend DNBR,LHR,AZTILT,ASI for adverse trends within a MAXIMUM of __1__ due to a loss of __2__?

1) 15 minutes

2) COLSS

Unit 1 is operating in Mode 4

the crew is cooling down and depressurizing following a LOOP

a loss of PKB-M42 occurs

what tech spec is in affect due to the loss of PK and how many aux spray valves are available?

3.8.4 DC sources OPERATING is in affect

one Aux spray valve is available

a loss of PW occurs, the crew should trip the (1) and the crew should break vacuum when the main turbine (2)

1) Reactor

2) when the main turbine reaches 1200 RPM

unit 3 is operating at 100%

a loss of IA and service air occurs

IA header lowers to 50PSIG

what will the reactor trip on?

Reactor will trip on Low SG WR level

(note, PZR spray valves will continue to operate until about 38 PSIG)

Unit 1 is operating at 100% power, the MG MVARS are at unity

a transmission line relaying causes voltage to of the grid to rise

(1) MG MVARs should initially be ….

(2) MG MVARs will be restored to unity via …

1) bucking

2) via manual voltage adjust

Unit 3 is at 50% power, the crew is recovering from a loss of MFP RPCB, while restoring overlap CEA 18 continues to withdraw without operator inputs, all effort to stop the rod are fail and the rod continues to withdraw

(1) as CEA 18 continues to withdraw its Integral rod worth available to insert should…

(2) if all actions to stop the CEA 18 fail, the crew should…

1) increase

2) trip the Reactor