RC-C-4963, Reactor Shutdown & Power Operation Part 1 (GFES)

Question 1

During power ascension to 100% power, reactor power is increased by increasing turbine load. Which of the following best describes the reactor operator’s role in the power increase? (Not applicable to Babcock & Wilcox reactors)

a. Use reactor coolant system (RCS) dilution and rod motion to maintain desired Tavg.
b. Use RCS boration and rod motion to maintain desired Tavg.
c. Prevent rod motion by slowly increasing load.
d. Use rod motion alone to maintain desired Tavg.

Answer 1

a. Use reactor coolant system (RCS) dilution and rod motion to maintain desired Tavg.

Question 2

A typical PWR inherently displays automatic load-following behavior. Changes in which of the following parameters are most responsible for initiating this behavior?

a. Steam generator feed flow
b. Steam generator steam flow
c. Reactor coolant system loop flow
d. Core bypass flow

Answer 2

b. Steam generator steam flow

Question 3

The most significant amount of heat generated by the core after shutdown is produced by:

a. Prompt neutrons
b. Delayed neutrons
c. Gamma and beta decay
d. Alpha and neutron emission

Answer 3

c. Gamma and beta decay

Question 4

A nuclear power plant has been operating at rated power for six months when a reactor scram occurs. Which one of the following describes the source(s) of core heat generation 30 minutes after the reactor scram?

a. Fission product decay is the ONLY significant source of core heat generation
b. Delayed nuetron-induced fission is the ONLY significant source of core heat generation
c. Fission product decay and delayed neutron-induced fission are BOTH significant sources and produce approximately equal rates of heat generation
d. Fission product decay and delayed neutron-induced fission are both insignificant sources and generate core heat at rates that are less than the rate of ambient heat loss from the core

Answer 4

a. Fission product decay is the ONLY significant source of core heat generation

Question 5

A reactor is operating at 100% power at the end of core life with all control systems in manual. The reactor operator inadvertently adds 10 gallons of boric acid to the RCS.

Which one of the following will occur as a result of the boric acid addition (assume MW output remains constant)

a. Pressurizer level will lower and stabilize at a lower value
b. RCS pressure will rise and stabilize at a higher value
c. Reactor power will lower and stabilize at a lower value
d. Tavg will rise and stabilize at a higher value

Answer 5

a. Pressurizer level will lower and stabilize at a lower value