The American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code [1], Section XI, Non mandatory Appendix E, “Evaluation of Unanticipated Operating Events”, provides a deterministic procedure for evaluating reactor pressure vessel (RPV) integrity following an unanticipated event that exceeds the operational limits defined in plant operating procedures. The recently developed risk-informed procedure for Appendix G to Section XI of the ASME Code [2, 3], and the development by the U.S. Nuclear Regulatory Commission (NRC) of the alternate Pressurized Thermal Shock (PTS) rule [4, 5, 6] led to initiation of this study to determine if the Appendix E evaluation criteria are consistent with risk-informed acceptance criteria. The results of the work presented in this paper demonstrate that Appendix E is consistent with risk-informed criteria developed for PTS and Appendix G and ensures that evaluation of RPV integrity following an unanticipated event would not violate material or operational limits recently defined using risk-informed criteria. Currently, Appendix E does not have evaluation criteria for BWR vessels; however, as part of this study, risk-informed analyses were performed for unanticipated heat-up events and isothermal, overpressure events in BWR plant designs.
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ASME 2011 Pressure Vessels and Piping Conference
July 17–21, 2011
Baltimore, Maryland, USA
Conference Sponsors:
- Pressure Vessels and Piping Division
ISBN:
978-0-7918-4456-4
PROCEEDINGS PAPER
A Risk-Informed Assessment of ASME Section XI, Appendix E
Ronald Gamble,
Ronald Gamble
Sartrex Corporation, Rockville, MD
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William Server,
William Server
ATI Consulting, Black Mountain, NC
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Bruce Bishop,
Bruce Bishop
Westinghouse Electric Company, Cranberry Township, PA
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Nathan Palm,
Nathan Palm
Westinghouse Electric Company, Cranberry Township, PA
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Carol Heinecke
Carol Heinecke
Westinghouse Electric Company, Cranberry Township, PA
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Ronald Gamble
Sartrex Corporation, Rockville, MD
William Server
ATI Consulting, Black Mountain, NC
Bruce Bishop
Westinghouse Electric Company, Cranberry Township, PA
Nathan Palm
Westinghouse Electric Company, Cranberry Township, PA
Carol Heinecke
Westinghouse Electric Company, Cranberry Township, PA
Paper No:
PVP2011-57201, pp. 941-954; 14 pages
Published Online:
May 21, 2012
Citation
Gamble, R, Server, W, Bishop, B, Palm, N, & Heinecke, C. "A Risk-Informed Assessment of ASME Section XI, Appendix E." Proceedings of the ASME 2011 Pressure Vessels and Piping Conference. Volume 6: Materials and Fabrication, Parts A and B. Baltimore, Maryland, USA. July 17–21, 2011. pp. 941-954. ASME. https://doi.org/10.1115/PVP2011-57201
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