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Homework Help: CANDU Reactor contains 70 kf og fissionable material

  1. Nov 8, 2011 #1
    1. The problem statement, all variables and given/known data

    2. Relevant equations

    Working at a rate of 1.204 x 10^22 fissions/s, what fraction of that 70 kg mass of Uranium will be fissioned during the 550 days of fuel installation? (Fuel rods are replaced appx. every year and a half)

    3. The attempt at a solution

    1.20x10^22 fissions/s = 1.0368 fissions/day

    550 days = 5.7x10^29 fissions

    5.7x10^29 fissions = 225376210.5 grams

    225376210.5 grams / 70 000 grams = 3219.66%. Which is incorrect.
    Last edited: Nov 8, 2011
  2. jcsd
  3. Nov 8, 2011 #2


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    Science Advisor

    The initial value of 1.2x10^22 fissions/s can't be right. At ~ 200MeV/fission, this is about 400 GW.
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