Title: On the potential to increase the accuracy of source term calculations for spent nuclear fuel from an industry perspective
Citation: ATW-INTERNATIONAL JOURNAL FOR NUCLEAR POWER vol. 65 no. 6/7 p. 353-361
Publication Year: 2020
JRC N°: JRC121528
ISSN: 1431-5254 (online)
URI: https://www.yumpu.com/en/document/read/63590033/atw-international-journal-for-nuclear-power-06-072020
Type: Articles in periodicals and books
Abstract: The accuracy of source term predictions is an important factor which determines the efficiency of interim and final storage of spent nuclear fuel. To minimize the required number of storage containers and to minimize the volume and mass of facilities while maintaining safety margins requires accurate codes to predict the decay heat and the gamma and neutron sources for time points ranging from months to thousands of years with minimum bias. While the relevant microscopic cross sections for the purpose of criticality safety received high attention in the last decades and have been extensively verified with single effects tests microscopic data relevant for spent nuclear fuel had smaller priority. Mostly integral effects tests with samples taken from commercially irradiated fuel have been used for validation purposes. The sparse data available from single effects tests means that many factors enter the uncertainty estimate of the measurement-theory comparisons and limits the ability to build highly accurate codes for source term calculations. Firstly, the current limits on source term accuracy which are mostly based on evaluations using databases like SFCOMPO and other proprietary tests is reviewed. Secondly, the industry practice of using one-size-fits-all penalty factors to account for uncertainties is compared to the requirement to account for the nuclide-wise improvement of microscopic data. Thirdly, the activities in the EURAD consortium to improve the prediction accuracies are described: validating updates of microscopic data with integral effects tests and analyzing irradiation samples with very accurately defined boundary conditions.
JRC Directorate:Nuclear Safety and Security

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