Transient Accident Analysis Flashcards
During an ESD, why should safety injection be throttled as soon as the throttle criteria is met?
A. Minimizes the possibility of pressurized thermal shock.
B. Prevents excessive cooldown.
C. Minimizes erosion damage to the injection valves.
D. Minimizes the time SI pumps are running on mini-flow.
Answer: A
With a steam generator tube ruptured and faulted SG that is steaming to atmosphere, the safety analyses assumes that feed is restored in approximately ___ minutes.
A. 11
B. 22
C. 30
D. 60
Answer: A
Which ONE of the following factors was a major contributor to the Chernobyl event?
A. The testing was conducted outside of procedural guidelines and limitations.
B. The plant power was too high to begin testing.
C. Their was no approved test procedure for the evolution.
D. The testing should have been conducted with the unit defueled.
Answer: A
Which ONE of the following plant conditions compounded control problems during the Chernobyl event?
A. Feedwater Control system was in manual.
B. Inadequate Shutdown Margin due to CEA position.
C. Reactor power was being maintained at 50%.
D. Both Turbine Generators were fully loaded electrically.
Answer: B
Which of the following plant initial condition(s) compounded control problems during the Chernobyl event:
A. Both Turbine Generators were fully loaded (electrically).
B. Control Element Drive was in local control.
C. Feedwater Control system was in manual.
D. Reactor power was approximately 7%.
Answer: D
Which of the following is an example of the containment in exceeding an analyzed condition?
A. A large break LOCA has occurred with a loss of the containment spray system and containment pressure is 120 psig.
B. A steam generator tube rupture and a stuck open main steam safety valve occur on the same steam generator.
C. The letdown line has broken at the outside containment boundary and the inside containment isolation valve will not close.
D. A loss of all feedwater event has occurred causing the pressurizer safeties to lift which leads to core uncovery.
Answer: A
The Containment Spray System is designed such that the peak Containment pressure following a design basis event be reduced by at least _______of its original value in less than _____ hours.
A. 75%, 24
B. 50%, 12
C. 75%, 12
D. 50%, 24
Answer: D
