last update April 18, 1998

  1. Increasing the fuel enrichment in a commercial PWR or BWR from 2.5% to 4.0% causes the value of the resonance escape probability to decrease.
    True False

  2. Increasing the physical size of a commercial BWR causes the value of the non-Leakage probability to increase because of the larger surface area.
    True False

  3. The time required for reactor power to change by a factor-of-e is called the reactor startup rate.
    True False

  4. For power reduction from 100% to 20% rated in a commercial PWR or BWR, the doppler coefficient of reactivity will contribute positive reactivity, requiring control rod insertion to maintain criticality.
    True False

  5. The conditions required for a reactor to be subcritical are: keff must be less than 1.0 and power must be decreasing with time.
    True False

  6. Delayed neutrons act as source neutrons by initiating chain reactions.
    True False

  7. The fraction of the neutron production that consists of precursor atoms is represented by the Greek letter beta.
    True False

  8. The strongest neutron source in the core is always the delayed neutron source.
    True False

  9. Prompt drop occurs in reactor rate during reactor scram.
    True False

  10. The rule-of-thumb value for the single precursor group effective decay constant (lambda- effective) when supercritical is 0.15 seconds-1.
    True False

The US Nuclear Regulatory Commission (USNRC) requires 80% correct for passing a License exam. All statements are false except for numbers 4, 6, and 7. An expert analysis of this quiz is given under EXPLANATION #3. Revisit us for the thrill of the next exciting quiz. Return to homepage.

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