Cross-sections for hydrogen production from vanadium in a fusion neutron environment

The experimental and evaluated information available from the literature on neutron cross-sections for hydrogen production from vanadium in a fusion n eutron environment has been reviewed. Discrepancies in these results were i dentified and likely explanations for their existence are suggested. Nuclea r-model calculations were performed using the statistical pre-compound code GNASH. The results from this analysis are compared with existing informati on. Revised cross-section values for use in contemporary calculations of hy drogen gas production in fusion reactors are recommended. The impact of the se revisions on other neutron cross-sections of vanadium that affect neutro nic calculations for fusion reactors is also discussed. Finally, integral c alculations of hydrogen production were performed for a typical fusion reac tor using the present recommended cross-section values. It was found that t his alternative cross-section set leads to a calculated value of hydrogen p roduction at the fusion reactor first wall which is a factor of 3.25 smalle r than obtained from similar calculations that employ evaluated cross-secti ons from the ENDF/B-6.4 Library exclusively. (C) 1999 Elsevier Science S.A. All rights reserved.