Question and answers Nuclear - NRC Generic Fundamentals...

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NRC Generic Fundamentals Examination Question Bank--BWR February 2016 Fission Product Poisons -1- TOPIC: 292006 KNOWLEDGE: K1.01 [2.7/2.8] QID: B558 Fission fragments or daughters that have a substantial neutron absorption cross section and are not fissionable are called... A. fissile materials. B. fission product poisons. C. fissionable nuclides. D. burnable poisons. ANSWER: B. TOPIC: 292006 KNOWLEDGE: K1.01 [2.7/2.8] QID: B1558 (P2858) A fission product poison can be differentiated from all other fission products because a fission product poison... A. has a higher microscopic cross section for thermal neutron capture. B. has a longer half-life. C. is produced in a greater percentage of thermal fissions. D. is formed as a gas and is contained in the fuel pellets. ANSWER: A.
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NRC Generic Fundamentals Examination Question Bank--BWR February 2016 Fission Product Poisons -2- TOPIC: 292006 KNOWLEDGE: K1.01 [2.7/2.8] QID: B1858 (P858) Fission product poisons can be differentiated from other fission products in that fission product poisons... A. have a longer half-life. B. are stronger absorbers of thermal neutrons. C. are produced in a larger percentage of fissions. D. have a higher fission cross section for thermal neutrons. ANSWER: B. TOPIC: 292006 KNOWLEDGE: K1.01 [2.7/2.8] QID: B2061 (P2058) A fission product poison can be differentiated from all other fission products in that a fission product poison will... A. be produced in direct proportion to the fission rate in the core. B. remain radioactive for thousands of years after the final reactor criticality. C. depress the power production in some core locations and cause peaking in others. D. migrate out of the fuel pellets and into the reactor coolant via pinhole defects in the clad. ANSWER: C.
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NRC Generic Fundamentals Examination Question Bank--BWR February 2016 Fission Product Poisons -3- TOPIC: 292006 KNOWLEDGE: K1.02 [3.1/3.1] QID: B55 Which one of the following lists the proper order of substances from the largest to the smallest microscopic cross section for absorption of thermal neutrons? A. B-10, U-235, Xe-135 B. B-10, Xe-135, U-235 C. Xe-135, U-235, B-10 D. Xe-135, B-10, U-235 ANSWER: D. TOPIC: 292006 KNOWLEDGE: K1.02 [3.1/3.1] QID: B256 (P2658) Compared to other poisons in the core, the two characteristics that cause xenon-135 to be a major reactor poison are its relatively __________ absorption cross section and its relatively __________ variation in concentration for large reactor power changes. A. small; large B. small; small C. large; small D. large; large ANSWER: D.
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NRC Generic Fundamentals Examination Question Bank--BWR February 2016 Fission Product Poisons -4- TOPIC: 292006 KNOWLEDGE: K1.02 [3.1/3.1] QID: B1058 (P1858) Which one of the following is a characteristic of xenon-135? A. Thermal neutron flux level affects both the production and removal of xenon-135. B. Thermal neutrons interact with xenon-135 primarily through scattering reactions. C. Xenon-135 is primarily a resonance absorber of epithermal neutrons.
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