| 摘要 |
PROBLEM TO BE SOLVED: To set equivalent coefficients of U isotopes, Np fuel and burnable poison which are not listed in equivalent coefficient tables that have already been prepared. SOLUTION: As to MOX fuel which contains one or more kinds of U isotopes that are not listed in the already-prepared equivalent coefficient tables because an equivalent fissile method is used for MOX fuel and also belongs to the same group in an equivalent coefficient table; required set numbers of the composition of U in the MOX fuel are set, MOX fuel with a representative composition in the group to which the set MOX fuel belongs is found and a reference point determined by the enrichment, burnup and infinite multiplication factor of the found MOX fuel is established. As to each MOX fuel where the required set numbers of the composition of U are set, then, the enrichment satisfying the reference point is found in prescribed procedures by using computational codes used to establish the reference point. Subsequently, the equivalent coefficients of the U isotopes which are not listed in the equivalent coefficient tables are obtained on the basis of the enrichment found as to each MOX fuel where the required set numbers of the composition of U are set, an equivalent fissile method and the equivalent coefficient tables. COPYRIGHT: (C)2009,JPO&INPIT
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