Integral test of Kerma data for SS-304 stainless steel in the D-T fusion neutron environment

An experiment to determine nuclear heating rates in an SS-304 assembly was conducted using the intense D-T neutron source FNS at JAERI, within the framework of the JAERI-USDOE collaborative program on fusion neutronics. The distribution of the heat deposition rate at a depth of up to 200 mm in an SS-304 assembly was measured directly with a microcalorimeter incorporated within the intense D-T neutron source. A heat transfer calculation code ADINAT, coupled with the neutron and γ-ray transport DOT3.5, was applied to derive a time dependence temperature profile in SS-304 probes during irradiation. It was demonstrated that the ADINAT is a powerful tool for analyzing the nuclear heating process in materials with low thermal conductivity such as SS-304. The measured heating rates were compared with comprehensive calculations to verify the adequacy of the currently available database relevant to the nuclear heating process. The analysis based on JENDL-3 nuclear data demonstrated that the calculation of heat deposition on SS-304, in general, was in good agreement with measurements.