Importance of zirconium cross sections in calculating reactivity effects for inert matrix fuels

Zirconium is employed as the "inert" component in several different inert m atrix fuel concepts currently under development (cermet, oxide solution, et c.). Relative to the situation in standard light water reactors, this impli es a very significant increase in the zirconium inventory, with a correspon dingly enhanced importance of the nuclear data for zirconium in calculating safety related parameters. The present paper discusses new numerical resul ts for various reactivity effects. On the basis of the current findings, it is recommended that a high priority be assigned to both the reduction of u ncertainties in the epithermal data for zirconium and to the improvement of methods for resonance self-shielding of these data. (C) 2001 Elsevier Scie nce Ltd. All rights reserved.