© Copyright 2016 OGF - Polling 192001 - Neutrons Rx Theory Neutrons.

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Presentation transcript:

© Copyright 2016 OGF - Polling Neutrons Rx Theory Neutrons

© Copyright 2016 OGF - Polling Neutrons 1.Delayed neutrons are neutrons that... A.are released at the instant of fission. B.are responsible for the majority of U-235 fissions. C.have reached thermal equilibrium with the surrounding medium. D.are expelled at a lower average kinetic energy than most other fission neutrons.

© Copyright 2016 OGF - Polling Neutrons 2.Which one of the following is a characteristic of a prompt neutron? A.Expelled with an average kinetic energy of 0.5 MeV B.Usually emitted by the excited nucleus of a fission product C.Accounts for more than 99% of fission neutrons D.Released an average of 13 seconds after the fission event

© Copyright 2016 OGF - Polling Neutrons 3.In a comparison between a delayed neutron and a prompt neutron produced from the same fission event, the delayed neutron is more likely to... A.leak out of the core. B.cause fission of a U-238 nucleus. C.become a thermal neutron. D.cause fission of a Pu-240 nucleus.

© Copyright 2016 OGF - Polling Neutrons 4.During a brief time interval in a typical reactor operating steady-state near the beginning of a fuel cycle, 1.0 x 10 3 delayed neutrons were emitted. Approximately how many prompt neutrons were emitted during this same time interval? A.1.5 x 10 5 B.6.5 x 10 6 C.1.5 x 10 7 D.6.5 x 10 8

© Copyright 2016 OGF - Polling Neutrons 5.Which one of the following types of neutrons in a reactor is more likely to cause fission of a U-238 nucleus in the reactor fuel? (Assume that each type of neutron remains in the reactor core until it interacts with a U-238 nucleus.) A.Thermal neutron B.Prompt fission neutron beginning to slow down C.Delayed fission neutron beginning to slow down D.Fission neutron at a U-238 resonance energy

© Copyright 2016 OGF - Polling Neutrons 6.A neutron that is released 1.0 x seconds after the associated fission event is classified as a ____________ fission neutron. A.delayed B.prompt C.thermal D.spontaneous

© Copyright 2016 OGF - Polling Neutrons 7.In a comparison between a prompt neutron and a delayed neutron produced from the same fission event, the delayed neutron requires __________ collisions in the moderator to become thermal; and is __________ likely to cause fission of a U-238 nucleus. (Ignore the effects of neutron leakage.) A.more; more B.more; less C.fewer; more D.fewer; less

© Copyright 2016 OGF - Polling Neutrons 8.In a comparison between a delayed neutron and a prompt neutron produced from the same fission event, the delayed neutron is more likely to... (Assume that each neutron remains in the core unless otherwise stated.) A.cause fission of a U-238 nucleus. B.travel to an adjacent fuel assembly. C.be absorbed in a B-10 nucleus. D.leak out of the core.

© Copyright 2016 OGF - Polling Neutrons 9.During a brief time interval in a typical reactor operating steady-state near the beginning of a fuel cycle, 4.25 x prompt neutrons were produced. Approximately how many delayed neutrons were produced in the reactor during this same time interval? A.2.8 x 10 8 B.6.5 x 10 8 C.2.8 x 10 9 D.6.5 x 10 9

© Copyright 2016 OGF - Polling Neutrons 10.Which one of the following is the process that produces the majority of delayed neutrons in an operating nuclear plant reactor? A.A thermal neutron is absorbed by a fuel nucleus. After a period of time, the nucleus fissions and releases a delayed neutron. B.A thermal neutron is absorbed by a fuel nucleus. The fuel nucleus fissions. During the decay process of the fission products, a delayed neutron is emitted. C.A fast neutron is absorbed by a fuel nucleus. After a period of time, the nucleus fissions and releases a delayed neutron. D.A fast neutron is absorbed by a fuel nucleus. The fuel nucleus fissions. During the decay process of the fission products, a delayed neutron is emitted.