Phenomena Identification and Ranking Tables on High Burnup Fuel Fragmentation, Relocation, Dispersal, and Its Consequences for Design-Basis Accidents in Pressurized- and Boiling-Water Reactors (NUREG/CR-7307)

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Publication Information

Manuscript Completed: March 2024
Date Published: May 2024

Prepared by:
Vesselin Palazov¹, Francis Bolger², Nathan Capps³, David Kropaczek⁴, Wade Marcum⁵, Kurshad Muftuoglu2, Gretar Tryggvason⁶, and Wolfgang Wiesenack⁷

1Information Systems Laboratories, Inc.  Tysons Corner, VA 22182	2Electric Power Research Institute Palo Alto, CA 94304
3Oak Ridge National Laboratory Oak Ridge, TN 37830	4Veracity Nuclear Lenoir City, TN 37771
5Oregon State University Corvallis, OR 97331	6Johns Hopkins University Baltimore, MD 21218
7Halden Reactor Project (retired) Halden, Norway

James Corson and Shawn Campbell, NRC Project Managers

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

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Abstract

This report presents the results from the U.S. Nuclear Regulatory Commission’s expert elicitation effort to develop phenomena identification and ranking tables (PIRTs) in support of addressing technical issues related to fuel fragmentation, relocation, and dispersal (FFRD) and its consequences during design-basis accidents related to the use of extended enrichment (EE) and high burnup (HBU) fuel in domestically operated pressurized- and boiling-water reactors. The developed PIRTs identify phenomena seen as relevant to EE/HBU FFRD and its consequences from a safety viewpoint and assess the importance, level of knowledge, and related uncertainty for the considered phenomena. The PIRTs enhance the agency’s knowledge base related to FFRD and its potential consequences for EE/HBU fuel use.