Analyses of the JUPITER fast reactor experiments using the ERANOS and JNC code systems - 028

JUPITER is a joint research program involving U.S.DOE and PNC of Japan, and is a series of experiments performed using a large fast critical facility. JNC (formerly PNC) has analyzed almost all of the JUPITER experiments using its own code system, and the results of analyses have been utilized for the FBR nuclear design study in Japan. On the other hand, the European analysis system ERANOS is under validation and was applied to an analysis of the JUPITER experiments. This paper describes the analyses performed using the two code systems and subsequent intercomparisons of the results. Two-region homogeneous core ZPPR-9 (the reference of JUPITER cores) and radially -heterogeneous core ZPPR-13A have been considered. The calculated parameters are criticality (critical mass), reaction rate distribution (reaction rate traverse), reaction rate ratio (spectrum index), sample Doppler reactivity, sodium (Na) void reactivity and control rod worth. (author)