Week 3 Flashcards
- The plant has tripped from 100% due to a large break LOCA in Containment.
- The crew has entered the LOCA EOP
- Containment pressure is 15 psig and stable.
- A LOOP has occurred.
- PBA-S03 has faulted.
- While the crew is performing the actions of the EOP, “B” CS pump trips due to a motor fault.
Which of the following is true?
The crew …
A. must leave the LOCA EOP because CTPC is NOT met.
B. may remain in the LOCA ORP as all SFSCs are still met.
C. must leave the LOCA ORP because Inventory Control is not met.
D. may remain in the LOCA ORP because no other EOP directly addresses this condition.
A. must leave the LOCA EOP because CTPC is NOT met.
- The reactor is tripped.
- A small break LOCA is in progress.
- A loss of all Feedwater is in progress.
- Pressurizer level is 35%.
- Pressurizer pressure is 2275 psia and rising.
Which one of the following would be an indication that RCS voiding is occurring?
A. Pressurizer level decrease when letdown flow is raised.
B. RCS pressure decrease when pressurizer heaters are energized.
C. Pressurizer level increase when pressurizer spray is activated.
D. RCS pressure increase when pressurizer spray is initiated.
C. Pressurizer level increase when pressurizer spray is activated.
- The reactor has been manually tripped
- A small LOCA has occurred.
- The LOCA procedure has been implemented.
Under what conditions would an operator be required to trip 2 RCP’s and under what conditions would an operator be required to trip all RCP’s?
A. actuation of MSIS and trip all RCPs on a loss of subcooling.
B. actuation of CSAS and trip all RCPs on subcooled margin of less than 24 degrees.
C. pressurizer pressure remaining below 1837 psia and trip all RCPs on a loss of seal injection flow.
D. pressurizer pressure remaining below 1837 psia and trip all RCPs on subcooled margin of less than 24 degrees.
D. pressurizer pressure remaining below 1837 psia and trip all RCPs on subcooled margin of less than 24 degrees.
- A hot leg break has occurred.
- All reactor coolant pumps are stopped.
- Representative core exit thermocouple temperature is 450°F.
- Maximum quadrant core exit thermocouple is 456°F.
- T-hot is 483°F and dropping.
- Pressurizer pressure is 610 psia.
- Containment temperature and pressure are 125°F and 2.0 psig.
WHICH ONE of the following identify the condition of heat transfer in the reactor coolant system?
A. Subcooled natural circulation
B. Saturated steaming through the break
C. Saturated natural circulation (reflux boiling)
D. Subcooled natural circulation with localized flow blockage.
A. Subcooled natural circulation
- A subcooled natural circulation cooldown is in progress following a small break LOCA in containment.
- Aux Spray is in use, lowering RCS pressure.
- Sub-Cooled Margin is 50°F and degrading slowly.
- Containment temperature is 120°.
- Pressurizer level is 45% and rising rapidly.
- HPSI is throttled.
- Reactor vessel head is reading 41%.
The Control Room Staff should immediately…
A. re-initiate full Safety Injection flow.
B. open the reactor vessel head vents.
C. stop depressurizing the RCS.
D. exit LOCA and enter the functional recovery procedure.
C. stop depressurizing the RCS.
The bases for the minimum required volume of the RWT ensures that at the time of RAS initiation the water level in the containment sump will be enough to provide NPSH for the ESF pumps and the decay heat boil-off rate is less than …
A. the minimum design flow of two HPSI pumps.
B. 75% of the minimum design flow of one HPSI pump.
C. the minimum design flow of one HPSI pump and one LPSI pump.
D. the minimum design flow of two HPSI pumps and two LPSI pumps.
B. 75% of the minimum design flow of one HPSI pump.
With the reactor at 100% power, what is the normal condition of the SIT outlet valves and why are they in that condition?
A. The valves are open and powered up to provide for rapid closure after a SIAS.
B. The valves are open and downpowered to maintain it as a passive system.
C. The valves are closed and powered up to allow the SIAS to automatically open the valves.
D. The valves are closed and downpowered to prevent voiding the RCS with nitrogen after a SIAS.
B. The valves are open and downpowered to maintain it as a passive system.
A 105 gpm RCS leak is occurring in Containment.
PBA-S03 is deenergized due to a bus fault.
The plant has been manually tripped and SPTAs have been performed.
The E Plan has been implemented.
No other malfunctions have occurred.
Which one of the following statements is correct?
A. Assembly is required.
B. Accountability is recommended.
C. Assembly is recommended.
D. Accountability is required.
C. Assembly is recommended.
- Pressurizer pressure is 1250 psia.
- Pressurizer level is 45%.
- HPSI injection is 330 gpm/cold leg (acceptable flow).
- Reactor coolant system is 28°F subcooled.
- Reactor vessel level monitoring system indicates 100% in plenum and upper head.
- No reactor coolant pumps are running.
- Containment temperature and pressure are 195°F and 11 psig, respectively.
- SIAS, CIAS, MSIS, and CSAS have actuated.
- A cooldown is in progress using steam generators, both WR levels are 50%.
WHICH ONE of the following identifies the action the Control Room Supervisor is to direct concerning high pressure safety injection use?
A. HPSI flow may be throttled to restore pressurizer level 10 to 70%.
B. HPSI flow may be throttled until HPSI flow is the same as break flow.
C. Continue maximum injection flow until subcooling is at least 24°F.
D. Continue maximum injection flow until subcooling is at least 44°F.
D. Continue maximum injection flow until subcooling is at least 44°F.
- Reactor coolant system pressure is 30 psig.
- A large break, design basis Loss Of Coolant Accident occurred 90 minutes ago.
- All safety injection systems have been operated as designed.
Which one of the following is the suction source for the containment spray pump (assume the operators have performed the required actions)?
A. Refueling water tank ONLY
B. Recirculation sump ONLY
C. Recirculation sump and RWT
D. Spent fuel pool and Recirculation Sump
B. Recirculation sump ONLY
The HPSI cold leg injection orifice is used during simultaneous hot and cold leg injection to:
A. provide instrumentation to measure flow to the hot and cold leg injection headers.
B. help balance SI flow to the hot and cold leg injection headers by being sized to allow approximately 50% flow.
C. prevent exceeding runout condition in the HPSI pumps to prevent pump cavitation.
D. provide minimum recirculation flow for the HPSI pumps to prevent overheating.
B. help balance SI flow to the hot and cold leg injection headers by being sized to allow approximately 50% flow.
Given the following plant conditions:
A LOCA has occurred on Unit 1.
Approximately one minute after the Train B Essential Chiller started, a fault locks out PBB-S04.
RCS pressure is 750 psig and lowering.
Based on this, the expected safety injection would be:
A. increasing LPSI and HPSI flow into all reactor coolant loops.
B. increasing HPSI flow into all reactor coolant loops.
C. increasing HPSI flow into reactor coolant loops 1A and 1B only.
D. increasing LPSI and HPSI flow into reactor coolant loops 1A and 1B only.
B. increasing HPSI flow into all reactor coolant loops.
Which one of the following systems is designed to automatically inject water into the Reactor Coolant System during a loss of coolant accident?
A. Safety Injection System.
B. Shutdown Cooling System.
C. Containment Spray System.
D. Essential Chill Water System.
A. Safety Injection System.
An event is classified as a Site Area Emergency due to a SGTR uncontrollably steaming to atmosphere.
Site Evacuation is….
A. mandatory.
B. optional.
C. prohibited.
D. prohibited until RP has completed its site boundary analysis.
A. mandatory.
Which one of the following responsibilities can the Emergency Coordinator (EC) delegate?
A. Re-classification of the event.
B. Protective Action Recommendations (PARs).
C. Authorization for workers to exceed 10CFR20 exposure limits.
D. Deployment of emergency teams.
D. Deployment of emergency teams.
