Implications of stress range for inelastic analysis. [CRBRP flued head containment penetration]

Conference · Thu Jan 01 00:00:00 EST 1981

OSTI ID:6373946

Karabin, M E; Dhalla, A K

The elastic stress range over a complete load cycle is routinely used to formulate simplified rules regarding the inelastic behavior of structures operating at elevated temperature. For example, a 300 series stainless steel structure operating at elevated temperature, in all probability, would satisfy the ASME Boiler and Pressure Vessel Code criteria if the linearized elastic stress range is less than three times the material yield strength. However, at higher elastic stress ranges it is difficult to judge, a priori, that a structural component would comply with inelastic Code criteria after a detailed inelastic analysis. The purpose of this paper is to illustrate that it is not the elastic stress range but the stress intensities at specific times during a thermal transient which provide a better insight into the inelastic response of the structure. The specific example of the CRBRP flued head design demonstrates that the temperature differential between various parts of the structure can be changed by modifying the insulation pattern and heat flow path in the structure, without significantly altering the elastic stress range over a complete load cycle. However, the modified design did reduce the stress intensity during steady state elevated temperature operation. This modified design satisfied the inelastic Code criteria whereas the initial design failed to comply with the strain accumulation criterion.

• Research Organization: Westinghouse Electric Corp., Madison, PA (USA). Advanced Reactors Div.
• DOE Contract Number: AC15-76CL02395
• OSTI ID: 6373946
• Report Number(s): CONF-810625-14; TRN: 81-010423
• Resource Relation: Conference: ASME PVP conference, Denver, CO, USA, 21 Jun 1981
• Country of Publication: United States
• Language: English

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