Document: NUREG-0800
Document ID: d6cdaae5-0185-464d-8d75-65c16116afd0
Document Type: srp
Title: -2
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1404/ML14043A231.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.9.3
CFR Part: 
CFR Title: 

Content:
Revision 3 – April 2014 transients, in combination with loads resulting from postulated seismic and other events) specified for Code constructed items designated as Code Class 1, 2, 3 (including Class 1, 2, and 3 component support structures) and core support structures are reviewed to determine that appropriate design and service limits have been designated for all loading combinations. The reviewer ascertains that the design and service stress limits and deformation criteria comply with the applicable limits specified in the Code and Appendix A to this SRP section. Service stress limits which allow inelastic deformation of Code Class 1, 2, and 3 components, component supports, and core support structures are evaluated as are the justifications for the proposed design procedures. Piping which is “field run” should be included. Internal parts of components, such as valve discs and seats and pump shafting, subjected to dynamic loading during operation of the component should also be included. 2. Design and Installation of Pressure Relief Devices. The design and installation criteria applicable to the mounting of pressure relief devices (safety valves and relief valves) for the overpressure protection of Code Class 1, 2 and 3 components. The review includes evaluation of the applicable loading combinations and stress criteria. The design extends to consideration of the means provided to accommodate the rapidly applied reaction force that occur when a safety valve or relief valve opens, and the transient fluid-induced loads applied to the piping downstream of a safety or relief valve in a closed discharge piping system. The dynamic structural response due to boiling water reactor (BWR) safety relief valve discharge into the suppression pool is also considered. The design of safety and relief valve systems with respect to the load combinations postulated for the safety or relief valves, upstream piping or header, downstream or vent piping, system supports, and BWR