CUED Publications database

Validation of WIMS/PANTHER PWR fuel reactivity depletion using the BEAVRS benchmark flux map data

Harrison, RD and Startin, G and Lindley, BA and Powney, DJ and Parks, GT and Hutt, PK (2016) Validation of WIMS/PANTHER PWR fuel reactivity depletion using the BEAVRS benchmark flux map data. In: UNSPECIFIED pp. 2833-2846..

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Abstract

A 1998 memo from the United States Nuclear Regulatory Commission, the Kopp Memo, proposed that for burnup credit analysis of spent fuel storage the uncertainty in fuel reactivity reduction with irradiation should be assumed to be 5% of the reactivity decrement. Studies undertaken for the Electric Power Research Institute (EPRI) using the CAS MO/SIMULATE codes, derived considerably smaller uncertainties than this by comparison with operating power distributions. To investigate whether these uncertainties were independent of the software package used to derive them, an equivalent analysis to the 2014 EPRI study has been carried out using the UK codes WIMS and PANTHER. As in the 2014 study the reactor data provided by the Benchmark for Evaluation And Validation of Reactor Simulations (BEAVRS) has been analysed to calculate reactivity decrement biases for the fuel batches. At each cycle point the irradiation of each fuel batch present was separately perturbed to derive a best fit (least RMS) to the measured reaction rates. The batch irradiation perturbations were then converted to reactivity increments. The biases thus found were similar in magnitude to those of the 2014 EPRI study thus reinforcing their conclusion that the corrected reactivities were code independent.

Item Type: Conference or Workshop Item (UNSPECIFIED)
Subjects: UNSPECIFIED
Divisions: Div A > Energy
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:39
Last Modified: 03 Aug 2017 03:11
DOI: