Published: Jan 1994
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For two typical LWR fuel rod irradiation devices introduced into the BR2 reflector two-dimensional neutron and gamma calculations are being carried out.
In the first case a single fuel rod surrounded by several pressure tubes and by a time-variable neutron screen (He−3 gas at various pressures) is studied. The calculations are carried out in R,θ geometry, centered on the irradiated fuel rod.
In the second case a bundle of nine fuel rods in a 3×3 square lattice is irradiated. Here the calculations are performed in X,Y geometry.
The necessity is discussed of performing two-dimensional calculations for these irradiations in the BR2 reflector, to improve the modelling of the fuel behaviour.
fissile structural materials irradiations, MTRs, reflector irradiations, geometrical modelling, two-dimensional calculations, fuel rod power
De Raedt, CM