Recent application of nuclear data to reactor core analysis in JAEA

Kugo, Teruhiko 

The status of application study of nuclear data in JAEA is introduced in the following categories, theoretical and study and code development, experiment and extension of experimental database and application to reactor core analysis including the fuel cycle back-end field. Sensitivities of fission product concentrations of LWR burned fuel to nuclear data have been evaluated based on the depletion perturbation theory. Important nuclear data are specified for the accurate prediction of fission product concentrations. Extended bias factor methods are applied for the uncertainty evaluation of a fast breeder reactor core. From the application, the extended bias factor methods powerfully eliminate the uncertainty due to cross section errors by utilizing a number of integral data.