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31 Cards in this Set

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The feedback arm on BG TCV-130, CVCS Letdown Temperature Control Valve, fell off. Shortly after, reactor power is noted to be slowly increasing.What is the probable cause of the power increase? A. Change in letdown flowrate causing channeling in the demineralizer.B. Change in Main Feedwater temperature due to flow variations in the S/G Blowdown System.C. Change in the CVCS letdown temperature causing a RCS deboration.D. Change in CVCS letdown temperature causing a RCS boration.
C
Why is the RHR System used for letdown to the CVCS during water solid plant operations? A. Normal letdown path to CVCS demins is isolated in MODE 4.B. The RHR System is needed to provide differential pressure for pressurizer spray.C. So the RHR System can provide the necessary pressure for seal injection.D. Pressure in the RCS is too low for normal letdown.
D
VCT makeup occurs unexpectedly and the RO notes trend recorder data indicates a possible RCS leak. When checking RCS parameters to validate this assumption, a formal Leak Rate calculation is not necessary.What parameter would NOT be used to estimate an RCS leak rate? A. CCW surge tank level decrease.B. VCT makeup frequency.C. PZR level decrease.D. Sump level increase.
A
Which of the following given conditions will most likely cause flashing in the letdown line? A. Letdown line pressure increase due to malfunction of BG PCV-131B. Actual pressurizer level exceeds programC. Actual pressurizer level goes below programD. Controlling pressurizer level instrument rapidly fails low
B
The plant has been at steady state 100% power when the operator notices the following conditions:Pressurizer Level 55% decreasingVCT Level 55% increasingSeal Water Flow LowLetdown Regen Hx Outlet Temp HighWhat is causing this transient? A. Small break LOCAB. Letdown isolationC. Reduced charging flowD. Pressurizer PORV open
C
A 30 gpm leak has developed on the charging header between BG HV-182, CVCS CHG PMPS TO REGEN HX, and the regenerative heat exchanger.The Control Room isolates the leak and completes the applicable Off-Normal procedures.What will be the reactor makeup and letdown flowpaths? A. seal injection and normal letdownB. alternate charging and normal letdownC. alternate charging and excess letdownD. seal injection and excess letdown
D
Which of the following could be a result of a loss of Vital AC Instrument bus NN03? A. Intermediate Range Hi Flux Reactor Trip.B. Source Range Hi Flux Reactor Trip.C. Charging pump suction swaps to the RWST.D. CVCS Letdown Isolation.
D
A loss of CVCS letdown will result in which one of the following? A. Increase in RCS activityB. decrease in RCS boron concentrationC. decrease in RCS conductivityD. increase in RCS hydrogen concentration
A
One minute after initiation of a large break LOCA at power, the charging header flow instrument FI-121 indicates 55 gpm with both CCPs running. Which of the below explains the indicated flow? A. Centrifugal Charging Pump Recirc Isolations to the RWST have opened on an SI signal. B. Seal injection flow is controlled by FCV-0121.C. HCV-182 has closed, isolating the charging header.D. The accident occurred concurrent with a loss of all AC power.
B
The RO notices RCS temperature is slowly increasing with the plant at 100% power. All systems are in automatic normal alignment. The RO begins appraising system conditions and notes the following:* Letdown is 75 gpm* Charging is 87 gpm* Seal Injection is 8 gpm/RCP* Pressurizer level is slightly above program* VCT Level is 42% and trending slowly up* Alarm window 104D, DEMIN WTR PRESS LO, is litWhat could be causing these readings? A. Mix Bed inlet temperature increasing due to failure of BG-TCV130, Letdown Hx Outlet to CCW Temp Control Butterfly Valve. B. CVCS Blending tee valve BG-FCV111A, Reactor Makeup to Boric Acid Blending Iso, is leaking by.C. A leak in the Seal Water Heat Exchanger.D. Charging is decreasing due to volume expansion in the RCS.
C
With the unit at full power normal alignment, the RO throttles open BG-HCV0182, Charging HDR Flow Control Valve.How does this action affect the plant initially? A. Seal injection decreases, Pressurizer level remains constant.B. Seal injection increases, Pressurizer level decreases.C. Total flow increases, Pressurizer level increasesD. Total flow decreases, Pressurizer level decreases
C
The unit is at 100% when BG-LT0185, Volume Control Tank Level Transmitter, failed low. The crew performs actions necessary to minimize boration by charging only to seals. The RO has Pressurizer level control in manual and has stabilized Pressurizer level when he notes the RCP seal return flow is less than previously recorded in the daily logs. What could cause this condition? A. Seal ?P is lower than previously.B. Seal return filter is bypassed.C. Excess Letdown in service.D. Seal injection flow is less.
C
The RHR discharge to the CVCS-SI pump header (EJ HV-8804A/ B) valves can supply the suction of the CCPs and SIPs. Which of the following alignments has these valves open? A. During the injection phase of ECCS operationB. During reduced inventory operationsC. During a normal plant shutdownD. During the recirculation phase of ECCS operation
D
Why is the Letdown flow diverted to the RHUT when placing a standby mixed bed demineralizer bed in service? A. To prevent injecting any sodium into the RCS to minimize crud buildup.B. To prevent overfilling the VCT when the new bed is paced in service.C. To minimize resin escaping the retention element entering the RCS.D. To minimize any reactivity change when the new bed is placed in service.
D
In Mode 1 annunciator 47E, RWST LEVEL HI/LO alarms and RWST level is 96%. The on-service BAT is 7500 ppm.What is the BG FK-110 setting for a 120-gpm makeup to the RWST, which meets the minimum T.S. boron concentration for Mode 1? A. 9.6B. 8.6C. 2.0D. 8.0
A
What action is necessary to increase seal leak-off (return) flow from the Reactor Coolant Pumps? A. Decrease RCS PressureB. Increase seal injection throttle valve settingC. Decrease VCT PressureD. Increase seal injection pressure
C
At 100% power, the following PRT conditions exist:* Level 75% and increasing* Pressure 8 psig and increasing* Temperature 1750F and increasingWhat could be the cause of these conditions? A. Reactor Makeup Water Supply Valve (BB-HV-8045) is open.B. Loss of CCW to Seal Water Heat Exchanger.C. Letdown Pressure Control Valve (BG-PCV-131) failed closed.D. VCT Relief Valve (BG-8120) is open.
C
With the Reactor Makeup System controller in AUTO, how does manipulation of the makeup potentiometers affect system operation? A. Turning the BA pot to 10.0 turns raises BA flow to 40 gpm and total flow to 148 gpm.B. Turning the Rx M/U WTR FLOW CTRL pot to 10.0 turns decreases BA flow.C. Turning the BA pot to 10.0 turns would raise BA flow to 40 gpm and total flow remains at 120 gpm.D. Turning the Rx M/U WTR FLOW CTRL pot to 10.0 turns raises total flow to 160 gpm.
C
What happens if BG PCV-131, LETDOWN PRESSURE CONTROL VALVE, is not manually opened before a LETDOWN ORIFICE ISOLATION VALVE, BG HV-8149A, B, or C, is opened? A. VCT LETDOWN DIVERT VALVE, BG LCV-112A, diverts to the RHUT.B. DEMINERALIZER DIVERT VALVE, BG TCV-129, shifts flow to the VCT.C. LETDOWN RELIEF VALVE, BG V-8117, lifts due to a pressure spike.D. LETDOWN REHEAT DIVERT VALVE, BG TCV-381B, fails open.
C
When does the "AUTO" closure feature of the Letdown Orifice Isolation Valves (BG HV-8149A, B & C) operate? A. On Letdown Isolation Valves full open.B. On high PZR level.C. After Letdown Isolation Valves BG HV-459 and 460 reach full close.D. Either low PZR level or a Letdown Isolation Valve not fully open.
D
Plant conditions are: NCP total charging flow 95 gpm Letdown flow 75 gpm Total seal return flow 12 gpm PZR level change 45% to 36% in 6 minutesIf all leakage were into the containment normal sumps, what is the RCS leak rate? A. 101 gpmB. 93 gpmC. 203 gpmD. 187 gpm
A
The plant is Mode 5. The Operator has just completed a make-up to the Reactor Coolant System and is now aligning the BG system for standby operation.What position will BG HIS-112A be restored to and why? A. IN VCT, to prevent a Boron DilutionB. IN AUTO, to prevent overfilling of the VCTC. IN AUTO, to prevent RCS inventory lossD. IN VCT, to prevent excessive Boration
A
Given the following conditions:* Reactor Power 100%* PZR Level 60% slowly increasing* PZR Pressure 2290 psig slowly increasing* Letdown Isolated* Charging 120 gpm and decreasing* S/G Levels 50% and stableWhat has occurred? A. Tavg increased due to inadvertant dilution.B. Spray valves failed closed.C. PZR level instrumentation failed low.D. KA HV-29, Instr Air to Ctmt Iso, failed closed.
D
The following conditions are given:* The Unit is at 100% power.* An unisolable rupture of the Instrument Air header has occurred.* Assume no operator action; all controller in automatic.* CCP "A" supplying charging flow.Which conditions and associated reason will cause the reactor to trip following this total loss of instrument air? A. The letdown isolation valves will close and the pressurizer will fill up causing a pressurizer high level trip. B. The auxiliary spray will fail open causing a pressurizer low pressure trip.C. The pressurizer spray valves will fail open causing a pressurizer low pressure trip.D. The main feed regulating valves will close causing a steam generator low level trip.
A
The unit is at full power when the Auxiliary Building Operator finds the normal charging header discharge valves for both Centrifugal Charging Pumps unlocked and open.What is the potential result of this misalignment? A. Normal Charging header relief will lift on a Loss of Site Power.B. One CCP could have inadequate flow on a Safety Injection.C. VCT relief will lift on a Loss of Site Power.D. Boron Injection Tank flow will cause the mini-flow recirc valves to shut on a Safety Injection.
B
While at 100% power, the operator is restoring letdown following maintenance, with the following conditions present:* Pressurizer level channels LT-459 and LT-460 selected for control.* Letdown isolation valves BG LCV-459 and 460 are closed.* Letdown orifice isolation valves BG HV-8149 A/B/C closed.* Pressurizer level channels indicate as follows: BB LI-459 20% BB LI-460 18% BB LI-461 19%The Operator depresses the OPEN pushbutton for BG HV-8149A and it does not open, why? A. Interlock from channel LT-461 is preventing it from opening.B. Interlock from LCV-459 and 460 is preventing it from opening.C. Hydraulic lock between the letdown orifice isolation and the letdown isolation valves.D. No motive force to open the valve without upstream pressure.
B
The following plant conditions exist:* 80% power* A CCP running* Letdown @ 75gpm* NB0101, CCP 'A' breaker trips openAssuming no operator action, what automatic actuation will occur? A. NCP will automatically start.B. Letdown will isolate on high temperature.C. Letdown will isolate at 17% pressurizer level.D. Reactor trip on low pressure 1940 psig.
C
The plant is in Mode 1 at 100% power when Pressurizer level falls below 17%.Which of the following describes the proper system response? A. CVCS letdown isolation valves BG LCV-459 & 460 close, and letdown orifice isolation valves BG HV-8149A/B/C close.B. CVCS letdown containment isolation valves BG HV-8152 & 8160 close and letdown heat exchanger pressure control valve BG PCV-131 opens.C. CVCS letdown containment isolation valves BG HV-8152 & 8160 close and letdown orifice isolation valves BG HV-8149A/B/C closeD. CVCS letdown isolation valves BG LCV-459 & 460 close, and letdown heat exchanger pressure control valve BG PCV-131 opens.
A
What is the basis for maintaining at least 15 psig in the Volume Control Tank? A. To ensure adequate mixing with the H2 blanket to scavenge O2 in the RCS.B. To ensure the O2 concentration in the VCT does not exceed 5% by volume when hydrogen is present.C. To provide adequate NPSH requirements for the charging pumps.D. Provides a backpressure for the RCP #1 seals.
D
The crew is responding to a loss of NN01 Instrument Bus using OFN NN-021, LOSS OF VITAL 120 VAC INSTRUMENT BUS, and affected instruments have been selected out when the RO requests that charging be reduced to the seals only.Why is this request made? A. Prevent flashing in the letdown lineB. Mitigate RCS temperature dropC. Mitigate high RCP seal filter differential pressureD. Prevent reactor trip on high Pressurizer level
B
Pressurizer level is decreasing with 45 gpm letdown and 225 gpm (on NPIS) charging flow. Seal leakoff is 2.1 gpm per RCP.What is the RCS leakage and appropriate actions required? A. 180 gpm, start all available charging pumpsB. 172 gpm, trip the reactorC. 217 gpm, trip the reactor and actuate SID. 172 gpm, isolate letdown
D