EXPERIMENT AND ANALYSIS OF INDUCED RADIOACTIVITY IN LARGE SS-316 STAINLESS-STEEL SHIELDING MATERIAL BOMBARDED WITH 14 MEV NEUTRONS

Radioactivities induced in SS-316 samples in a thick SS-316 shield mat erial bombarded with 14 MeV neutrons were measured after cooling times ranging from several hours to 8 months. Experiments focusing in parti cular on deep locations where the (n, gamma) reactions are dominant we re analyzed by activation inventory codes ACT4 and REAC3, and the act ivation cross-section libraries the JENDL activation file, the data li brary associated with the REAC3 code system and FENDL/A1.1. The ratio of calculated to experimental results gave a practical uncertainty ra nge for the calculations with the presently available code systems. It was shown experimentally that not only activation cross-sections but also neutron spectrum calculations are sources of large uncertainties in the calculation of radioactivities.