NUCLEAR HEATING MEASUREMENTS FOR SS-316, COPPER, GRAPHITE, TUNGSTEN, CHROMIUM, BERYLLIUM IN A COPPER CENTERED ASSEMBLY BOMBARDED WITH 14 MEV NEUTRONS AND ANALYSIS

Under ITER/EDA R&D Task T-218, an experiment on nuclear heating was co nducted at the Fusion Neutronics Source Facility (FNS) in JAERI in ord er to provide experimental data of nuclear heating for structural mate rials and to validate the data and methods relevant to ITER design cal culations. Probe materials, SS-316, Cu, W, Zr, Be, Cr and graphite wer e tested in a copper centered experimental assembly bombarded with 14 MeV neutrons. A calorimetric method and TLDs were employed for total h eating and gamma-heating measurements, respectively. The measurements were carried out along a central axis of a copper centered experimenta l assembly. The total heating rate in the probe material was derived f rom a temperature rise measured by a thermistor attached to the probe. MCNP4A with JENDL-3.2, JENDL-Fusion File and FENDL-1 libraries were u sed for experimental analyses. Nuclear heating was derived with the us e of KERMA factors based on JENDL-3.2 and FENDL-1. The adequacy of the KERMA data is discussed based on nuclear heating ratios of calculatio n to experiment (C/E). (C) 1998 Elsevier Science S.A. All rights reser ved.