Abstract
The evaluation of the spatial distribution of gamma heating in fast reactors requires consideration of all the gamma intensity components. However, the delayed gamma ray yield data of all actinides are not included in evaluated nuclear data files such as ENDF or JEDNL. In this study, new neutron and gamma cross section constants considering the delayed gamma ray based on JENDL-3.2 and JENDL-4.0 were developed. Neutron and gamma ray coupling calculations for the Joyo experimental fast reactor core revealed that the gamma flux increased by approximately 40% when the delayed gamma intensities in both JENDL-3.2 and JENDL-4.0 were considered. The calculated gamma heating rates were verified by comparison with the measured data obtained by on-line irradiation rigs. It was confirmed that the calculated gamma heating rates agreed with the measurements to within 3–12%.
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