CVCS Flashcards
CHB-UV-515 will close on which of the following?
- SIAS
- CIAS
- CSAS
- Regenerative HX outlet temp. HI @ 413F
- LDHX outlet temp HI @ 135F
- SIAS
- Regen HX outlet temp. HI @ 413 F
What will cause CHA-UV-516 to close?
SIAS
CIAS
Loss of IA/Loss of PK to solenoid
What two valves are Tech Spec containment isolation valves?
CHA-UV-516 & CHB-UV-523
What valve(s) will change position on a high temp of 135F?
CHB-UV-523 goes closed
CHE-UV-521 bypasses the boronometer
CHE-UV-520 bypasses the ion exchangers
What in the Letdown System tells us that we have fuel failure?
RU-155D
What will auto close CHE-PV-201P/Q?
High temperature of 148F sensed at TE 224
Unit 3 is at 100% power with all systems in a normal lineup.
Charging Mode Selector CHN-HS-4 is in 2-3-1.
CHE-P01 is powered from its ‘A’ power supply.
Startup Transformer NAN-X02 trips on sudden pressure.
All equipment operates as designed.
What is the status of the charging pumps?
A. CHE-P01 is running. CHB-P01 is anti-pumped.
B. CHE-P01 is running. CHB-P01 stopped but can auto-start.
C. CHB-P01 is running. CHE-P01 is anti-pumped.
D. CHB-P01 is running. CHE-P01 stopped but can auto-start.
C
Unit 1 was at 100% power with all systems in a normal lineup.
Charging Mode Selector CHN-HS-4 is in 2-3-1.
CHE-P01 is powered from its ‘A’ power supply.
Palo Verde had a loss of all offsite power.
All equipment operated as designed.
What is the status of the charging pumps?
A. CHB-P01 and CHE-P01 are anti-pumped.
B. CHB-P01 and CHE-P01 stopped but can auto-start.
C. CHB-P01 stopped but can auto-start. CHE-P01 is anti-pumped.
D. CHB-P01 is anti-pumped. CHE-P01 stopped but can auto-start.
D
Unit 1 is at 100% power with all systems in a normal lineup.
VCT level transmitter CHN-LT-227 fails high.
With no operator action, what is the expected plant response?
A. Boration will start through CHN-UV-514
B. Charging pumps will trip on low suction pressure
C. VCT level will be maintained between 34% and 44%
D. Letdown will isolate
C
Unit 1 is at 100% power with all systems in a normal lineup.
An RCS leak develops, causing the CRS to enter 40AO-9ZZ02, Excessive RCS Leakage.
VCT auto makeup is disabled to perform a leak rate determination.
VCT level drops to 5%.
With no further operator action, which of the following automatic actions will occur?
A. VCT inlet valve CHN-UV-500 will divert to the PHIX.
B. Makeup Supply to Charging Pumps CHN-UV-527 will open.
C. BAMP recirculation valve CHN-UV-510 will close.
D. Gravity Feed to Charging Pumps CHE-UV-536 will open.
C
Which of the following is NOT credited as a boration flow path per TRM 3.1.101, Flow Paths - Operating? A. From RWT or SFP through CHE-UV-536 B. From RWT through CHB-V327 C. From RWT through CHN-UV-527 D. From RWT or SFP through CHN-V164
C
Unit 2 is at 100% power with all systems in a normal lineup.
An improper valve lineup during a HPSI ST causes the RWT to dump water into the ‘A’ ESF sump. After the cause has been corrected, the RO notes RWT level is 60%.
Which of the following methods can be used immediately if boration is required?
A. Align charging pumps to CHB-V327
B. Align charging pumps to CHE-UV-536
C. Align charging pumps to CHN-UV-514, bypassing the boric acid makeup pump filter.
D. Inject to the RCS with a HPSI pump.
A
Unit 3 is at 100% power with all systems in a normal lineup.
VCT level transmitter CHN-LT-226 fails low.
With no operator action, which of the following automatic actions will occur?
A. VCT outlet isolation CHE-UV-501 will close
B. VCT inlet CHN-UV-500 will divert letdown to the PHIX
C. Makeup to Charging Pumps CHN-UV-527 will open
D. Charging Pumps will trip on low suction pressure
B
Unit 1 was at 100% power with all systems in a normal lineup.
The reactor trips, and three full strength CEAs stick out.
PBA-S03 faults and is de-energized.
The CRS directs the RO to borate the RCS.
Which of the following standard appendices can be used to borate the RCS from the control room?
A. 103-A: BAMP, through CHN-FV-210Y and CHN-UV-527, to charging pump suction.
B. 103-D: RWT gravity feed to charging pump suction by opening CHE-UV-536 and closing CHE-UV-501
C. 10: RWT gravity feed to charging pump suction through CHB-V327
D. 11: SFP gravity feed to charging pump suction through CHE-UV-536
A
Which of the following does NOT discharge to the Reactor Drain Tank?
A. Pressurizer safety valves
B. RCP vapor seal leakoff
C. Gravity drains from the recycle drain header
D. Pressurizer and Reactor Vessel Head vents
C
Unit 3 was at 100% power with all systems in a normal lineup.
A fuse failure causes an inadvertent actuation of ‘B’ train CSAS.
Operators secure ‘B’ CS pump and restore NC to containment.
No further operator action is taken.
Which of the following statements is true?
A. RDT level is going up. VCT level will be maintained automatically between 34% and 44%.
B. Charging pumps tripped off and restarted 40 seconds after the CSAS.
C. RCP seal injection flow control valves have failed open.
D. Letdown isolated due to an automatic closure of CHB-UV-523.
A
State the maximum letdown flow rate.
Do not exceed maximum design letdown flow rate of 150 gpm.
Is it better to raise the LDHX outlet temp set-point to a little above 100F or to let NC flow through the LDHX exceed 1500 gpm to try and maintain 100F?
The maximum operating NC flowrate of 1500 gpm should never be exceeded to maintain a lower LDHX outlet temp. of 100F. The set point should be raised to 120F before letting NC flow go above 1500 gpm through the LDHX.
What is the minimum required quench volume of the RDT? EDT?
- 52% in the RDT
- 35% in the EDT
At what pressures will the RDT and the EDT isolate?
- 10 psig in the RDT
- 7 psig in the EDT
What are the pressure limitations associated with the Volume Control Tank (VCT)?
Do not exceed 63 psig to prevent lifting of the relief valve (that sees VCT pressure plus the head of water in the VCT).
Do not let pressure go below 3 psig.
Unit 1 is at 100% power with all systems in a normal lineup.
Letdown Backpressure Controller CHN-PIC-201 fails to 0% output.
Which of the following indicates how the plant will respond?
A. CHN-UV-500 will divert letdown to the CVCS HUT
B. EDT pressure will rise
C. Pressurizer level will go down
D. CHN-UV-523 will automatically close on high letdown heat exchanger outlet temperature.
B
Unit 2 is in Mode 5. ‘A’ LPSI pump is being used for shutdown cooling. Shutdown Purification is in service.
Chemistry requests for purification flow to be raised from 25 gpm to 50 gpm.
The RO will accomplish this by…
A. raising output on CHN-LIC-110 to open letdown control valves.
B. lowering output on CHN-LIC-110 to open letdown control valves.
C. raising output on CHN-PIC-201 to open backpressure control valves.
D. lowering output on CHN-PIC-201 to open backpressure control valves.
C
The deborating ion exchanger is filled with: A. Cation resin ONLY B. Anion resin ONLY C. Cation AND Anion resin D. Inert resin
B
When and why might the deborating ion exchanger be placed in service?
A. At the beginning of core life, because dilutions cannot reduce boron concentration.
B. At the beginning of core life, because a large amount of radwaste will be generated when reducing boron concentration.
C. At the end of core life, because dilutions cannot reduce boron concentration.
D. At the end of core life, because a large amount of radwaste will be generated when reducing boron concentration.
D
Unit 3 has been at 100% power for 200 days.
150 days ago, ion exchangers CHN-D01A and D01B were flushed with RCS water.
CHN-D01A has been in service as the purification ion exchanger.
CHN-D01B is the delithiating ion exchanger.
The last delithiation was performed one month ago. No flushing was done during that time.
A delithiation is performed using CHN-D01B. What is the expected plant response?
A. VCT level will rise
B. Reactor Power will rise
C. Cold leg temperature will lower
D. CEAs will automatically insert a few steps
C
Unit 2 is at 100% with all systems in a normal lineup.
Fuse failures cause an inadvertent ‘B’ train SIAS.
Pressurizer and VCT levels are stable.
The RO looks at the following ‘B’ train SESS component windows:
#1 08B - LETDOWN TO REGEN HX ISOL VLV UV-515
#2 08C - LETDOWN TO REGEN HX ISOL VLV UV-523
What is the status of the blue SEAS lights for those windows?
A. #1 is on, #2 is on
B. #1 is on, #2 is off
C. #1 is off, #2 is on
D. #1 is off, #2 is off
B
How will letdown flow initially respond to CHN-201P failing open.
flow will initially increase.
VCT Outlet Valve (CHN-UV-501) automatically opens and closes on…
Closes on a VCT LO-LO level of 5%. Opens after the LO-LO level clears.
Will open if LO-LO Level is not present and CHA-UV-536 is closed
Charging pumps receive power from…
CHA-P01 is powered from PGA
CHB-P01 is powered from PGB
CHE-P01 can be powered from PGA or PGB
If suction pressure decreases to approximately ____ the associated CHP will trip on low suction pressure
13 psia
Describe Charging Pump Operations during a SIAS/CSAS (Mode 1)
- load sequencer will prohibit the AUTO start of any Charging Pump for a period of 40 seconds
- Running pumps are NOT tripped on a Safety Injection Actuation Signal or Containment Spray Actuation Signal
- Pumps will be controlled by the signals from the Pressurizer Level Control System if the handswitch is in the AUTO-AFTER-STOP position.
Describe Charging Pump Operations during a LOP AND SIAS (Sequencer Mode 2)
- All Charging Pumps are Load Shed.
- After the Diesel Generator output breaker closes the BOP ESFAS load sequencer will prohibit the AUTO start of any Charging Pump for a period of 40 seconds.
- After the delay, the Charging Pumps will automatically restart as required by the Pressurizer Level Control System.
Describe Charging Pump Operations during a LOP NO SIAS (Sequencer Mode 3)
- All Charging Pumps are stopped and in an Anti-Pump condition.
- Pumps must be manually restarted by green flagging the pump handswitch
State the auto actions and associated set points regarding Charging Pumps and Pressurizer Leve Control.
- The “Normally Running” Charging Pump stops at +15% Pzr Level deviation from set-point and rising and restarts at 14% Pzr Level deviation from set-point and lowering.
- The “Standby” Charging Pump starts at -23.5% Pzr Level deviation from set-point and lowering and stops at -14% Level deviation from set-point and rising.
Operation of the Charging Pumps without seal lube water is allowed under emergency conditions for up to…
50 hours.
During normal operations the Charging Header Isolation Valve (CHA-HV-524) is maintained…
opened with its power supply LOCKED OPEN. This prevents isolating the Pressurizer Auxiliary Spray flow-path due to spurious or inadvertent valve operation
VCT Auto makeup starts and stops at…
Starts an auto makeup at 34% VCT Level
Stops an auto makeup at 44% VCT Level
VCT Level Differential Alarm (Deviation between CHN-LT-226 and CHN-LT-227) occurs at…
a difference in level of 6 inches, which is approximately 8%
On a VCT Lo-Lo Level of __(1)__ the following occurs:
(1) 5%
- Opens CHN-UV-514
- Closes CHN-UV-501
- Starts a BAM Pump
- Closes CHN-UV-510
- Opens CHE-HV-536 if CHN-UV-514 has lost power
- Resets at 15% and repositions the above listed components
This ESF Reserve Volume ensures that the ESF pump suction will not be aligned to the containment sump until the point at which…
75% of the minimum design flow of one HPSI pump is capable of meeting or exceeding the decay heat boil-off rate.
BAMP Pumps stop on RWT Lo-Lo Level of .
73%
RWT permissive to RAS is at a level of
9.4%
9.0 Boric Acid Makeup Pump Suction Isolation Valve (CHN-UV-532) is normally…
hand-jacked in the Open Position with air isolated to prevent inadvertently isolating Boration Flowpaths.
