SYMPOSIA PAPER Published: 01 June 2023

Methodology for Adjusting Reactor Pressure Vessel Embrittlement Predictions Using Heat-Specific Surveillance Data


An approach is presented for adjusting a generic embrittlement trend curve (ETC) for trend and bias differences to measured reactor pressure vessel steel heat-specific Charpy embrittlement shift data. With heat-specific embrittlement measurements, prediction certainty is increased; therefore, the uncertainty term of the ETC can be reduced. A technical basis is presented quantifying product-form-specific uncertainty terms when heat-specific measurements are available using the ASTM E900-15 embrittlement database. For steel heats irradiated in different plants, additional uncertainty was observed with an associated increased uncertainty term developed. The approach depends on the number of heat-specific embrittlement measurements available.

Author Information

Hall, J., Brian
Westinghouse Electric Company LLC, Pittsburgh, PA, US
Mays, Ben, E.
Westinghouse Electric Company LLC, Cranberry Township, PA, US
Simpson, Derek, A.
Westinghouse Electric Company LLC, Cranberry Township, PA, US
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Pages: 121–143
DOI: 10.1520/STP164720220065
ISBN-EB: 978-0-8031-7742-0
ISBN-13: 978-0-8031-7741-3