Pressurized water reactor fuel crud and corrosion modeling |
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Authors: | Jeff Deshon Dennis Hussey Brian Kendrick John McGurk Jeff Secker Michael Short |
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Affiliation: | 1.Electric Power Research Institute,Palo Alto,USA;2.Los Alamos National Laboratory,Los Alamos,USA;3.National Nuclear Laboratory,Didcot, Oxfordshire,UK;4.Westinghouse Electric Company,Cranberry Township,USA;5.Massachusetts Institute of Technology,Cambridge,USA |
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Abstract: | Pressurized water reactors circulate high-temperature water that slowly corrodes Inconel and stainless steel system surfaces,
and the nickel/iron based corrosion products deposit in regions of the fuel where sub-cooled nucleate boiling occurs. The
deposited corrosion products, called ‘crud’, can have an adverse impact on fuel performance. Boron can concentrate within
the crud in the boiling regions of the fuel leading to a phenomenon known as axial offset anomaly (AOA). In rare cases, fuel
clad integrity can be compromised because of crud-induced localized corrosion (CILC) of the zirconium-based alloy. Westinghouse
and the Electric Power Research Institute have committed to understanding the crud transport process and develop a risk assessment
software tool called boron-induced offset anomaly (BOA) to avoid AOA and CILC. This paper reviews the history of the BOA model
development and new efforts to develop a micro-scale model called MAMBA for use in the Consortium for Advanced Light Water
Reactor Simulation (CASL) program. |
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