Fundamentals Flashcards
Your crew is operating AFA-P01 locally to feed the Steam Generators post Reactor Trip. Assume: SGs pressure and level in normal post trip bands. The AO locally admits steam to the turbine of AFA-P01(per procedure), which one of the following initially results from this action? Pump speed…
A. rises and discharge pressure lowers.
B. lowers and discharge pressure rises.
C. and discharge pressure rise.
D. lowers and discharge pressure lowers.
Answer: C
A 1/M plot may predict a higher than actual ACP while withdrawing Regulating Group 3 CEAs between 45” and 105”. Which one of the following is the reason for this?
A. Group 4 CEAs are typically worth less in that region.
B. Group 3 CEAs are typically worth less in that region.
C. Some group 4 CEAs shadow the Excore Nuclear Instruments.
D. Group 3 is shadowing the excore Nuclear Instruments in that region.
Answer: C
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
Describe core reactivity during the Chernobyl accident.
A. Amount of core reactivity exceeded prompt critical.
B. Reactor went sub critical when the reactor was scrammed.
C. Core remained critical until it was uncovered then it went subcritical.
D. Reactor went subcritical on the scram but regained criticality when the graphite followers entered the core.
Answer: A
The purpose of the test that led to the “Chernobyl Accident” was to detemine…
A. if the positive void coefficient would shut down the reactor as power decreased.
B. how the void coefficient changed during the power decline.
C. how long the turbine generator would continue to supply power as the generator coasted down.
D. if the turbine generator could support running 8 circulation pumps during coastdown.
Answer: C
Which one of the following identifies the meaning of a red light (RL) being lit at the local breaker panel for NBNS01J, Turbine Cooling Water Pump “A”?
A. The breaker is open and trip coil circuit continuity is satisfactory.
B. The breaker is closed and trip coil circuit continuity is satisfactory.
C. The breaker is closed and the closing springs are charged.
D. The breaker is closed (there is no other input to the red light).
Answer: B
Which one of the following will cause a 1/M plot to predict a lower than actual Anticipated Critical Position?
A. A stationary group shadows the excore nuclear instruments from the effects of a group being withdrawn.
B. The startup is performed with a stronger neutron source.
C. A regulating group moves through a region where it has a higher than average rod worth.
D. A regulating group moves through a region of the core that has a lower than average fuel concentration.
Answer: C
Which one of the following identifies a condition that must be satisfied for the clear light (CL) to be lit at the local breaker panel for NBNS01K, Nuclear Cooling Water Pump NCP01A?
A. The breaker closing circuit has continuity.
B. The breaker closing spring is discharged.
C. The breaker closing spring is fully charged.
D. The breaker trip circuit is ready to operate if needed.
Answer: C
The amount of heat required to raise a pound of substance 1 degree F is the:
A. specific entropy.
B. specific thermal energy.
C. specific heat capacity.
D. specific internal energy.
Answer: C
While withdrawing control rods during an approach to criticality, the stable count rate doubles. If the same amount of reactivity that caused the first doubling is added again, stable count rate will __________ and the reactor will be ____________.
A. more than double: critical
B. double: critical
C. double: subcritical
D. more than double: subcritical
Answer: A
Which of the following could cause the CPC calculated value of DNBR to INCREASE?
A. Power is increased by dilution with rods remaining at the ARO position.
B. Grid frequency decreases slightly.
C. Pressurizer pressure increases by 15 psi.
D. Power is increased by withdrawing Reg Grp 5 rods 10” to the ARO position.
Answer: C
During a reactor startup, equal increments of reactivity are added and the count rate is allowed to reach equilibrium each time. Which statement best describes what is observed?
A. The change in equilibrium count rate is the same each time.
B. The time required to reach equilibrium is shorter each time.
C. The change in equilibrium count rate is greater each time.
D. The time required to reach equilibrium is the same each time.
Answer: C
