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Report No.

Nuclear data application in Monju

Hazama, Taira 

Various nuclear data have been applied to the reactor physics test analyses in Monju. Good accuracy is confirmed with JENDL-3.3 for the analysis of reactor physics tests performed in 1994-1995. On the other hand, a clear discrepancy is observed for the reactivity loss caused by the $$^{241}$$Pu decay from 1994 to 2010. The discrepancy is resolved with JEDNL-4.0, where the revision of the $$^{241}$$Pu fission cross section and $$^{241}$$Am capture cross section contributes. Use of covariance data is promising application in the future design calculation. Based on the reactor physics test analyses, the reliability of the covariance data is investigated and covariance data that needs improvement are extracted. It is suggested that data on the average cosine of the scattering angle of $$^{23}$$Na need to be improved.



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