Unformatted text preview: 5.297 [neutrons.barn].
Compare your result to the actual critical mass of the Godiva
Experiment composed of 93.9 percent enriched Uranium235 where
M(critical)= 48.8 kgs.
c) Calculate these values for a Pu239 spherical reactor with:
microscopic transport cross section = 6.8 barns
microscopic radiative capture cross section = 0.26 barns
density = 19.74 [gm/cm3]
average number of neutrons released per fission ν = 2.98
microscopic fission cross section = 1.85 barns
Compare your result to the actual critical mass of the Jezebel
Experiment composed of pure Pu239 where M(critical)= 20.53 kgs. 35 Apr. 26 May 3 Consider a reactor with a core in the form of a cube of side length a.
1. Solve the diffusion equation in the Cartesian coordinate system to
determine the flux distribution in the x, y and z directions.
2. Determine the expression for the geometrical buckling for the
cubical reactor.
3. Determine the expression for the critical side length, ignoring the
extrapolation distance.
4. Determine the expression for the critical volume and the critical
mass for a cube reactor.
5. Calculate and compare the critical masses for a fast U235 reactor,
using the data from the previous problem, for the following
geometries:
a) Cubical core,
b) Cylindrical core with a height to diameter ratio of unity: (H/2R) =
1,
c) A spherical core. Assignments Policy
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 Winter '08
 Ragheb,M
 Nuclear Fission, Neutron, Nuclear physics, 1958, Nuclides

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