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Report No.
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Preparation of unified cross section library for demonstration fast breeder reactor (III); Analysis of reactor physics experiment in "JOYO" startup test

Yamaoka, Mitsuaki*; Kawashima, Masatoshi*

To prepare unified library applicable to licensing calculation of the demonstration fast breeder reactor as well as base design calculation, the experimental data of the small reactor "JOYO" were re-evaluated and analyzed that had not been utilized in cross section adjustment before. The data of "JOYO" startup tests and operation were analyzed with cross section set based on the evaluated nuclear data library JENDL3.2 to provide integral data for cross section adjustment as power reactor data to supplement critical experiment data. The analysis is the first work that evaluated the core characteristics of "JOYO" MK-I and MK-II cores consistently. In the present work, errors and their correlation factors of both experiment and analysis data were evaluated for criticality, sodium void worth, fuel replacement worth and burnup coefficient. The recommended future work includes comparison of results with critical experiments, addition of experiment data to adjustment so as to reduce of dependency of prediction error upon core size.

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