Burn-up credit methodology for UO2 and MOX fuel assemblies in AREVA/COGEMA
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1Cogema, 2 rue Paul Dautier, BP 4, 78141 Vélizy, France
htoubon@cogema.fr
2CEA Cadarache, 13108 Saint Paul Lez Durance Cedex, France
3Canberra-Eurisys, 4 avenue des Frênes, 78067 St Quentin-en-Yvelines Cedex, France
INTRODUCTION
For the last five years, Areva/Cogema has been implementing the second phase of its burn-up credit programme (including fission products). Since the early nineties, major actinides have been taken into account in criticality analyses.
Next year (2003), COGEMA will be making allowance for the six main fission products ( 103Rh, 133Cs, 143Nd, 149Sm, 152Sm and 155Gd) that contribute to 50% of the negative reactivity of all fission products. The experimental programme is nearing completion. The new burn-up credit methodology is in progress.
After giving a general overview, this paper will focus on the new burn-up measurement system for MOX fuel assemblies. It will describe the measurement instrumentation and the measurement experiment that is planned for early 2003 at La Hague.
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