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One group neutron diffusion calculation

  1. Jun 27, 2012 #1
    i need a help in solving ,using 1 group approxmation , estimate the critical size of cube consisting of 75% zirconium-91 and 25% plutonium--239 by volume , when the cube is surrounded by a vacumm.

    zr-91
    microscopic cross section (capture)=0.00335
    microscopic cross section (scattering )=5.89
    density=6.4 g/cm3
    Mass=90.9056 g/mol

    pu-239
    v=2.98 n/fission
    microscopic cross section (fission)=1.81
    microscopic cross section (capture)=0.05
    microscopic cross section (scattering )=7.42
    density=19 g/cm3
    Mass=239.0522 g/mol
     
    Last edited: Jun 27, 2012
  2. jcsd
  3. Jun 27, 2012 #2

    QuantumPion

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    Science Advisor
    Gold Member

    Use the geometric and material buckling equations. When the cube is critical, Bm = Bg by definition.
     
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