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Report No.
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Nuetron streaming effect in analysis of JUPITER experiment (II)

Takeda, Toshikazu*; not registered; not registered; not registered; not registered; not registered

Detailed analysis of a part of JUPITER Phase I experiments has been performed by taking into account the neutron streaming effect. The effect of neutron leakage in cell calculations was estimated in terms of the albedo collision probability method, and the several reaction rate distributions in x and y directions in ZPPR-9 assembly were analysed. Using the effective group constants preserving reaction rates in a super-cell, we calculated the control-rod worth of pin rods used in ZPPR-10A, and estimated the smearing and transport effects. Direct core calculations were performed by taking into account the heterogeneity in the pin rod drawers and the results were compared with those obtained by using the effective group constants. Further reactivity worths of diluent materials measured in ZPPR-10C were analysed by using transport and diffusion calculations. In the diffusion calculation, the Benoist and the unified diffusion coefficients were used.

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