Document: NUREG-0800
Document ID: d51db4b1-0b68-4e27-8107-a41ccdbd671a
Document Type: srp
Title: ASME CODE CLASS 1, 2, AND 3 COMPONENTS, COMPONENT SUPPORTS,
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070337.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.9.3
CFR Part: 
CFR Title: 

Content:
ed on a case-by-case basis by questions addressed to the applicant to determine the rationale and justification for exceptions. Final determination is based on engineering judgment and past experience with prior applications. 3.9.3-13 DRAFT Rev. 2 - April 1996 c. The design and service stress limits selected by the applicant for each set of design and service loading combinations as established in (a) are reviewed to 76 determine if they meet those specified in Appendix A. The provisions forcriteria to ensure piping component functional capability are reviewed to determine 77 their adequacy in meeting the objectives set forth in Appendix A. Deviations from the position may be permitted provided justification is presented by the applicant. The acceptability determination is based on considerations of adequate margins of safety. In the ABWR and System 80+ design certification FSERs the Staff accepted an exemption to 10 CFR 100 Appendix A requiring that all safety-related SSCs be designed to remain functional and within applicable stress and deformation limits when subjected to an OBE. Acceptance of the exemption was predicated on the use of an alternative seismic analysis based entirely on the SSE and implementation of additional procedural requirements relating to a seismic event. The Staff's evaluation of ASME Code Class 1, 2, and 3 components and core support structures ensured that appropriate measures and adequate safety margins were maintained when the OBE was eliminated from design.78 2. Design and Installation of Pressure Relief Devices The objective of the review of the design and installation of pressure relief devices is to assure the adequacy of the design and installation so that there is assurance ofensure the 79 integrity of the pressure relieving devices and associated piping during the functioning of one or more of the relief devices. In the CP review, it is determined whetherif there is 80 reasonable assurance that the final design will meet these