Pre-evaluation of fusion shielding benchmark experiment

Abstract

A shielding benchmark experiment is very useful to test the design code and nuclear data for fusion devices. There are many types of benchmark experiment that should be done in fusion shielding problems, but time and budget are limited. Therefore it will be important to select and determine the effective experimental configurations by precalculation before the experiment. We did pre-evaluations of three types of shielding benchmark experiment to determine the experimental assembly configurations. The types of experiment discussed are the void effect experiment, the auxiliary shield experiment, and the SCM (superconductive magnet) nuclear heating experiment. These calculations were performed by using two-dimensional discrete ordinate transport code DOT3.5 with first collision source prepared by GRTUNCL code. Group constants used was FUSION-40 (neutron 42 group, photon 21 group, P5 Legendre expansion) processed from Japanese Evaluated Nuclear Data Library JENDL-3. All three types of configuration were finally determined with consideration of detector efficiencies and measurement time.