Regulatory Guide (RG) 1.161 and American Society of Mechanical Engineers Boiler and Pressure Vessel Code (ASME Code), Section XI, Nonmandatory Appendix K contain stress intensity factor (SIF) equations for both the internal pressure and thermal gradient loading cases. However, the technical basis behind these equations was developed only for Ri/t = 10, were Ri is the inner vessel radius and t is the vessel thickness. While this geometry is appropriate for most pressurized water reactors (PWR), most boiling water reactor (BWR) vessels have Ri/t = 20. This paper explores the validity of applying these SIF equations to BWRs. This confirmatory work includes calculating SIF by independent methods. The one-dimensional heat equation is solved to provide a physical basis for the thermal stresses.
Thermomechanical Analysis of Pressure Vessels
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Benson, M, Rudland, D, & Kirk, M. "Thermomechanical Analysis of Pressure Vessels." Proceedings of the ASME 2012 Pressure Vessels and Piping Conference. Volume 3: Design and Analysis. Toronto, Ontario, Canada. July 15–19, 2012. pp. 853-860. ASME. https://doi.org/10.1115/PVP2012-78229
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