Document: NUREG-0800
Document ID: 2b55237b-f6cf-417d-804c-de03aaebd0b5
Document Type: srp
Title: -21
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1233/ML12334A360.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.9.3
CFR Part: 
CFR Title: 

Content:
Draft Revision 3 – June 2013 This appendix provides guidance for reviewers on the following subjects regarding Code Class 1, 2, and 3 components and component supports, and core support structures: A. Consideration of design loadings and limits. B. Consideration of service loading combinations resulting from postulated events and the designation of acceptable service limits. C. Consideration of functional capability and operational readiness of piping and active pumps and valves under service loading combinations resulting from postulated events. D. Applicability of the appendix to components, component support structures, and core support structures and procedures for compliance. 4. ASME CLASS 1, 2, AND 3 COMPONENTS, COMPONENT SUPPORTS, AND CORE SUPPORT STRUCTURES A. Design Loadings and Design Limits. Code Class 1, 2, and 3 components and component supports, and core support structures, shall be designed to satisfy the appropriate subsections of the Code as required in 10 CFR 50.55a, including limitations on pressure, and including the requirements of this appendix. Component supports shall be designed to maintain deformations within appropriate limits as specified in the component support Design Specifications. Design loadings shall be established in the Design Specification. The design limits of the appropriate subsection of the Code shall not be exceeded for the design loadings specified. Fatigue evaluations are required by the Code for all Class 1 components. Fatigue evaluations should also be completed for all Code Class 2 and 3 components and component supports, and core support structures that are subject to thermal cyclic effects or dynamic cyclic loads. The scope, methods, and results of fatigue evaluations should be reviewed by the staff. Fatigue analyses of components and supports should be completed if the fatigue evaluations so indicate and these analyses, as well as their results, should be reviewed and compared with the guidance in the Code.