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Homework Help: Intro to Nuclear Engineering Help

  1. Sep 3, 2009 #1
    1. The problem statement, all variables and given/known data

    If 57.5% of the fission neutrons escape from a bare sphere of 235 Uranium, what is the multiplication factor of the sphere?. In this system, the average value of nu being 2.31.
    2. Relevant equations

    nu= number of neutrons emitted per absorption in the fuel

    3. The attempt at a solution
    Very basic problem, yet wanted to check my answer and understanding of it.
    Since 57.5% of the fission neutrons escape, that means 42.5% of the fission neutrons are being used. So for every 1 fission neutron used 2.31 fission neutrons are being emitted. So the multiplication factor for the system would be .425(2.31)= 0.982, thus stating the reactor is subcritical, since the multiplication factor is less than 1.
  2. jcsd
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