Development of gamma cross section library for fast reactor gamma heating calculations

Chiba, Go; Hazama, Taira ; Suzuki, Takayuki 

In order to evaluate gamma heating spatial distribution in fast reactors, a gamma cross section library UFGLIB.J40 and an utility to obtain macroscopic gamma constants for gamma-ray transport calculations are developed. The library UFGLIB.J40 is generated from the latest nuclear data library JENDL-4.0. The energy group structure for neutron is the JAERI fast set-type 70-group structure and that for photon is the MATXSLIB-type 42-group structure. The macroscopic gamma constant calculation utility generates gamma constants in binary format files from UFGLIB.J40 and the information given in PDS files yielded by a fast reactor lattice code SLAROM-UF. For verifications of UFGLIB.J40 and the utility, experimental data of gamma heating spatial distribution measured at the FCA XI-1 assembly are analyzed. Good agreement between calculation and experimental values is obtained.