Joint report of JAERI/USDOE collaborative program on fusion neutronics

The selection of materials and design options for fusion device components depends crucially on the level of radioactivity and decay-heat induced in the components due to D-T neutron irradiation. A series of experiment of induced radioactivity has been carried out in the framework of the JAERI/USDOE collaborative program on fusion neutronics. The experiments aim to characterize induced radioactivities of fusion reactor structural components subjected to D-T neutron environment and to provide experimental data for verifying currently available calculation codes and their associated nuclear data libraries relevant to the activation. The materials subjected were Fe, Ni, Cr, Mn-Cu alloy, Ti, Mo, Zr, Ta, W, Si, Mg, Al, V, Nb, and SS316, which were irradiated in various fusion neutron spectrum fields utilizing experimental configuration through Phase-IIC to Pase-IIIB. The cooling times applied ranged from 10 minutes to 7 days. The data were given as the integrated γ-ray emission rate as well as γ-ray spectrum (over 100 keV to 3 MeV) at specific cooling times. Preliminary experimental analyses have been performed using four leading radioactivity codes: DKRICF, REAC*2, RACC and THIDA. This report summarizes all of experimental results along with the data required for the successive experimental analysis. (author)