Main Steam Flashcards
Given the following plant conditions: Loss of PKD-M44 How many ADV’s are available from the control room?
A. 2
B. 0
C. 1
D. 4
Answer: A
Unit 1 tripped from 100% full power. SPTA’s in progress SIAS, CIAS, MSIS, and AFAS-1 have initiated. The RCS is in forced circulation. Steam Generator #1 pressure is 750 psia and dropping rapidly. Steam Generator #1 level is 8% WR and dropping rapidly Steam Generator #2 pressure is 940 psia and slowly lowering. Steam Generator #2 level is 37% WR and slowly lowering. Auxiliary feedwater flow is > 2000 gpm to steam generator #1. Auxiliary feedwater flow is 0 gpm to steam generator #2. WHICH one of the following actions correctly address the existing symptoms ?
A. Allow maximum flow to SG #1 until level is greater than 10% WR.
B. Throttle and balance flow to each steam generator.
C. Stop feeding SG #1 and allow SG #2 to feed in RTO.
D. Stop feeding SG #1 and ensure feedwater flow is restoring level in SG #2.
Answer: D
With a loss of PNC-D27, how many ADVs are OPERABLE?
A. 2
B. 1
C. 4
D. 3
Answer: C
Given the following plant conditions: Loss of PNA-D25 How many ADV’s are available from the control room?
A. 0
B. 2
C. 1
D. 4
Answer: B
The reactor is tripped following a Steam Generator Tube Rupture. RCS pressure is 895 psia. RCS subcooling is 55°F. Steam Generator #1 pressure is 890 psia. RU-4 in high alarm. Steam generator #1 is isolated. Steam generator #1 level is 78% NR and rising slowly. Steam generator #2 level is 50% NR and steady. WHICH ONE of the following is the preferred method to control level in the isolated steam generator?
A. Line-up high rate blowdown to the condenser from #1 steam generator.
B. Steam the #1 steam generator to atmosphere via the ADVs.
C. Lower RCS pressure below #1 steam generator pressure and allow backflow to the RCS.
D. Bypass the MSIV and steam the #1 steam generator to the condenser.
Answer: C
When the MSIV EXER/TEST switch is taken to the ACC CH TEST position, the operator can determine…
A. if the valve is capable of being closed with the hydraulic pump alone.
B. the discharge pressure of the system’s hydraulic pump.
C. the accumulator’s pre-charge pressure.
D. the operability of the actuator by stroking the valve to the 90% open position.
Answer: C
Which one of the following describes the impact when taking a MSIV valve EXER/TEST switch to the ACC CH TEST position?
A. Vents off nitrogen from the accumulator, verifying the operation of the installed pressure instrumentation.
B. Verifies the operation of the accumulator by stroking the valve to the 90% open position.
C. Verifies the pre-charge of the accumulator by dumping hydraulic fluid to the sump.
D. Vents off the nitrogen from the accumulator, verifying that the hydraulic pump is capable of creating sufficient pressure to operate the valve.
Answer: C
Which ONE of the following states the effect of taking the MSIV EXER/TEST switch to the “EXER” position?
A. Lines up the actuator system to discharge the associated accumulator to the hydraulic reservoir.
B. Cycles only the valve actuator to 90%.
C. Closes the MSIV to the 90% open position using the hydraulic accumulator.
D. Closes the MSIV to the 90% open position using the hydraulic pump.
Answer: D
ASSUME the MSIV Test Switch for UV 170 is placed to the “EXER” position. Which one of the following statements describes the correct operation of the MSIV?
A. Only the valve actuator cycles (not the valve) to 90%. A limit switch causes the valve actuator to slow open to 100%.
B. The valve slow closes until the 10% open limit switch causes the MSIV to slow open.
C. The valve closes using only hydraulic pump discharge pressure. When the MSIV reaches it’s exercise limit, a limit switch causes MSIV to slow open to 100%.
D. The oil accumulator discharges to allow the nitrogen charge for the valve to be checked.
Answer: C
Unit 1 is operating at rated power. One Atmospheric Dump Valve (ADV) becomes inoperable. The other valves are operable. Based on these conditions, the Operating Crew is required to… (Consider the TS requirement ONLY)
A. perform no actions since the LCO is met.
B. restore the inoperable ADV within 1 hour.
C. restore the inoperable ADV within 30 minutes.
D. immediately take action to place the plant in Mode 3.
Answer: A
ASSUME the MSIV Test Switch for UV 170 is placed to the ‘EXER’ position.
A. The valve closes using only hydraulic pump discharge pressure. When the MSIV reaches it’s exercise limit, a limit switch causes the MSIV to slow open to 100%.
B. Only the valve actuator cycles (not the valve) to 90%. A limit switch causes the valve actuator to slow open to 100%.
C. The valve slow closes until the 10% open limit switch causes the MSIV to slow open.
D. The oil accumulator discharges to allow the nitrogen charge for the valve to be checked.
D. The oil accumulator discharges to allow the nitrogen charge for the valve to be checked.
Upon a loss of air how does the Main Steam Isolation Valve respond?
A. The valve fast closes.
B. The valve does not change position and can still be slow closed.
C. The valve does not change position and can still be fast closed.
D. The valve fails as is
C. The valve does not change position and can still be fast closed.
Which of the following accurately describes the Downcomer Isolation Valve failure modes?
A. Fail OPEN on a loss of power and fail OPEN on a loss of pneumatic pressure
(Air and N2, including accumulator)
B. Fail CLOSED on a loss of power and fail CLOSED on a loss of all pneumatic pressure
(Air and N2, including accumulator)
C. Fail OPEN on a loss of power and fail CLOSED on a loss of all pneumatic pressure
(Air and N2, including accumulator)
D. Fail CLOSED on a loss of power and fail OPEN on a loss of all pneumatic pressure
(Air and N2, including accumulator)
C. Fail OPEN on a loss of power and fail CLOSED on a loss of all pneumatic pressure
(Air and N2, including accumulator)
Main Steam Safety Valve position indicator SGN-ZI-715 shows valve positions of ____ percent open.
A. 0,9,100
B. 0,50,100
C. 0,25,100
D. 0,25,50
A. 0,9,100
