Resonance shielding-factor cross-section processing technique validation based on tungsten decay heat experimental data

This study presents a method to obtain corrected self-shielded radiative ca pture cross-sections for tungsten isotopes to be used for activation calcul ations. The approach used is based on the application of the Bondarenko shi elding factor method to the 175-group AMPX master library by means of the B onami-Nitawl scale-4.3 sequence calculation The ANITA-4M activation code ca lculates the tungsten radioisotopes production and the decay heat using the self-shielded cross-sections from ENDF/B-VI, JEF-2.2 and JENDL-3.2 data fi les. Two irradiation scenarios (5 min and 7 h) in the international thermon uclear experimental reactor (ITER)-like neutron flux spectrum defined by th e fusion neutron source experiments are analyzed. The unshielded calculatio ns result in discrepancy with experiment up to 70%, while the self-shieldin g treatment reduces drastically that discrepancy to less than few percents. In comparison to the experimental integral decay heat values provides a va lidation of the method used to deal with the self-shielding treatment. (C) 2000 Elsevier Science B.V. All rights reserved.