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Open AccessArticle

Preliminary Assessment of Criticality Safety Constraints for Swiss Spent Nuclear Fuel Loading in Disposal Canisters

1
Paul Scherrer Institute (PSI), 5232 Villigen PSI, Switzerland
2
National Cooperative for the Disposal of Radioactive Waste (NAGRA), 5430 Wettingen, Switzerland
*
Author to whom correspondence should be addressed.
Materials 2019, 12(3), 494; https://doi.org/10.3390/ma12030494
Received: 18 December 2018 / Revised: 24 January 2019 / Accepted: 28 January 2019 / Published: 5 February 2019
(This article belongs to the Special Issue Materials for Nuclear Waste Immobilization)
This paper presents preliminary criticality safety assessments performed by the Paul Scherrer Institute (PSI) in cooperation with the Swiss National Cooperative for the Disposal of Radioactive Waste (Nagra) for spent nuclear fuel disposal canisters loaded with Swiss Pressurized Water Reactor (PWR) UO2 spent fuel assemblies. The burnup credit application is examined with respect to both existing concepts: taking into account actinides only and taking into account actinides plus fission products. The criticality safety calculations are integrated with uncertainty quantifications that are as detailed as possible, accounting for the uncertainties in the nuclear data used, fuel assembly and disposal canister design parameters and operating conditions, as well as the radiation-induced changes in the fuel assembly geometry. Furthermore, the most penalising axial and radial burnup profiles and the most reactive fuel loading configuration for the canisters were taken into account accordingly. The results of the study are presented with the help of loading curves showing what minimum average fuel assembly burnup is required for the given initial fuel enrichment of fresh fuel assemblies to ensure that the effective neutron multiplication factor, k e f f , of the canister would comply with the imposed criticality safety criterion. View Full-Text
Keywords: spent nuclear fuel; geological repository; criticality safety; burnup credit; loading curves spent nuclear fuel; geological repository; criticality safety; burnup credit; loading curves
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MDPI and ACS Style

Vasiliev, A.; Herrero, J.; Pecchia, M.; Rochman, D.; Ferroukhi, H.; Caruso, S. Preliminary Assessment of Criticality Safety Constraints for Swiss Spent Nuclear Fuel Loading in Disposal Canisters. Materials 2019, 12, 494.

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