Document: NUREG-0800
Document ID: 3d313c6f-7766-49fb-8400-3b6dae97fe7d
Document Type: srp
Title: SPECIAL TOPICS FOR MECHANICAL COMPONENTS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052340595.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.9.1
CFR Part: 
CFR Title: 

Content:
technical justification be submitted. 3. If the applicant elects to use experimental stress analysis techniques in lieu of theoretical stress analyses, sufficient information must be presented in the SAR to demonstrate that the requirements of Appendix If to Reference 7 as they apply to the conditions set forth in the "Design Specifications" have been met. 4. If the applicant employs an elastic or an elastic-plastic method of analysis to evaluate the -design of safety-related Code or non-Code items for which Service Level D limits have been specified (NB-3225 and Appendix F of Reference 7), the review covers the following points: a. The applicant must demonstrate that the stress-strain relationship for component materials that will be used in the analysis is valid. The ultimate strength values at service temperature must be justified. 3. 9;1-4 Rev. 2 - July 1981 b. The analytical procedures to be used in the analysis are reviewed to determine the validity of the analysis. If a computer program -is used, the applicable requirements of subsection II.2 above shall be met. c. If elastic system analysis is used, its application may require detailed review and justification if applied to the analysis of systems which contain active components with close tolerances, or systems in which the sequence of load application could significantly affect the actual stress distribution. d. If elastic, elastic-plastic or limit analysis methods are used for components in conjunction with elastic or elastic-plastic system analyses, the basis upon which these procedures are used are reviewed. The applicant shall provide assurance that the calculated item or item support deformations and displacements do not violate the corres- ponding limits and assumptions on which the methods used for the system analysis are based. Any deviations that have not been justified to the satisfaction of the staff are identified and the finding is transmitted to the applicant with a request that, unless