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Report No.
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Preparation of a basic data base for shieldind design

Mori, Tomoaki*; Takemura, Morio*

With use of a standard groupwise shielding design library JSSTDL produced from the latest evaluated nuclear data library JENDL-3.2, experimental analyses for the Radial Shield Attenuation Experiment (Configuration II; B$$_{4}$$C, configuration V; Na+B$$_{4}$$C) and the Special Materials Experiment (Configuration III; Polyethylene) were performed. The results were compared with those obtained by the same analysis method and input data using JSDJ2 library that had been applied consistently to the JASPER experiment analyses. In general, the results with JSSTDL analyses are higher than those by JSDJ2. In comparison of the analysis for the configuration including fissionable layer, it was made clear that the cross section libraries with only one group structure in the thermal energy region may give inadequate results when the thermal neutron flux level is relatively high in the fissionable layer neighbouring to such material with big slowing-down effect as polyethylene. Also it was confirmed in the thick sodium configuration that the balanced mesh sizes between axial and radial directions are important for accurate analysis. After a brief review of the state of the JASPER experiment analyses up to this time, important configurations for experiment reanalyses were selected and items of such data as input for the reanalyses were also listed up. The data for reanalyses of some of the selected configurations were arranged in computer files.

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