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last update April 12, 1998

  1. The effect of reactivity on neutron behavior can be expressed as the:
    a. factor of change in neutron population in successive neutron generations.
    b. change in neutron population in one second.
    c. deviation from steady state in successive neutron lifetimes.
    d. fractional change in neutron population in successive neutron generations.

  2. A positive reactivity change indicates that:
    a. the reactor is supercritical.
    b. keff has increased.
    c. final reactivity is positive.
    d. initial reactivity was negative.

  3. Multiple reactivity changes may occur either in a time sequence or simultaneously. The net reactivity change is:
    a. the same for both situations.
    b. larger for reactivity changes in sequence.
    c. not predictable, because it depends on the specifics of timing.
    d. larger for reactivity changes that occur simultaneously.

  4. Delta-k is defined as:
    a. the factor of change in neutron population in successive generations.
    b. the change in neutron population in one second.
    c. the deviation of keff from criticality.
    d. the fractional change in non-fission source neutrons in successive generations.

  5. With control rods fully inserted before startup keff = 0.8975. The reactivity value is:
    a. -1142x10-4.
    b. -1025x10-4.
    c. -114x10-4.
    d. -102x10-4.

  6. The core neutron population in generation-1 is 1.0236x1020 neutrons. In generation-2 the core neutron population is 0.9725x1020 neutrons. The reactivity value is:
    a. -525x10-4.
    b. +499x10-4.
    c. -236x10-4.
    d. -275x10-4.

  7. Reactivity is:
    a. a function of the composition and geometry of the reactor.
    b. dependant on the magnitude of the neutron population.
    c. not a physical property of the reactor.
    d. determined by the strength of the non-fission neutron source.

  8. Operational restrictions on the rate of power increase typically limit positive reactivity to:
    a. +3.1x10-10.
    b. +15x10-4.
    c. +65x10-4.
    d. +1500x10-4.

  9. Reactivity rate is expressed as:
    a. (delta N/N)/second.
    b. (delta k/k)/second.
    c. delta rho/second.
    d. delta(delta k/k)/generation.

  10. A reactivity change that occurs in less than 1 second is classified as:
    a. a reactivity ramp.
    b. a prompt jump in reactivity.
    c. a step change in reactivity.
    d. a reactivity discontinuity.

Answers are 1d, 2b, 3a, 4c, 5a, 6a, 7a, 8b, 9c, and 10c. Generally, questions will be grouped into categories. But anything pertaining to reactor behavior is fair game. There will be questions requiring calculation to ascertain the correct answer. If you have favorite questions that you would like to share, e-mail them to us. We will post them with credit to you, unless instructed otherwise. Revisit us to continue your Exam Bank upgrade. Return to homepage.

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