REVIEW OF THE NUCLEAR DATA STATUS AND REQUIREMENT FOR FISSION REACTORS
Japan Atomic Energy Research Institute
319-11 Tokai-mura, Naka-gun, Ibaraki-ken, Japan
Energy Research Laboratory, Hitachi Ltd.
Moriyama-cho, Hitachi-shi, Ibaraki-ken, Japan
The nuclear data involved in high conversion light water reactors with tighter pitch lattice are reviewed from the viewpoint of calculating the conversion ratio, burnup and coolant void reactivity coefficient, which are of primary important for the core characteristics evaluation. With the intermediate spectrum, various problems in the nuclear data used for fission reactor analysis appear. The resulting understanding will be also useful to enhance accuracy of the data/methods for thermal and/or fast reactors.
KEYWORDS: intermediate spectrum, resonance parameters, FPs and higher actinides