United States Nuclear Regulatory Commission - Protecting People and the Environment

Analysis of Experimental Data for High Burnup PWR Spent Fuel Isotopic Validation — ARIANE and REBUS Programs (NUREG/CR-6969)

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Publication Information

Manuscript Completed: June 2009
Date Published: February 2010

Prepared by:
G. Ilas, I.C. Gauld, and B.D. Murphy

Oak Ridge National Laboratory
Managed by UT-Battelle, LLC
Oak Ridge, TN 37831-6170

M. Aissa, NRC Project Manager

Prepared by:
Office of Nuclear Regulatory Research
U.S. Nuclear Regulatory Commission
Washington DC 20555-0001

NRC Job Code Y6685

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Abstract

This report is part of a report series designed to document benchmark-quality radiochemical assay data against which computer code predictions of isotopic composition for spent nuclear fuel can be validated to establish the uncertainty and bias associated with the code predictions. The experimental data analyzed in the present report were acquired from two international programs: (1) ARIANE and (2) REBUS, both coordinated by Belgonucleaire. All measurements include extensive actinide and fission product data of importance to spent fuel safety applications including burnup credit, decay heat, and radiation source terms. The analyzed four spent fuel samples were selected from fuel rods with initial enrichments of 3.5, 3.8, and 4.1 wt % 235U, which were irradiated in two pressurized water reactors operated in Germany and Switzerland to reach burnups in the 30 to 60 GWd/MTU range. Analysis of the measurements was performed by using the two-dimensional depletion sequence of the TRITON module in the SCALE computer code system.

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