Document: NUREG-0800
Document ID: b43625e5-7a9e-473b-bb9a-eaa2ca15ae27
Document Type: srp
Title: -19
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:
Certain of the service stress limits specified by the Code (i.e., level C and D) may not ensure the functionality of components, including their supports, to deliver rated flow and retain dimensional stability. The combination of loadings, the selection of the applicable design and service stress limits appropriate to each load combination, and the proper consideration of functionality is beyond the scope of the Code. The treatment of functionality, including collapse and deflection limits, is not adequately treated by the Code for all situations. Such factors should therefore be evaluated and appropriate information should be developed for inclusion in the Design Specification or other referenced documents. Applicants require guidance with regard to the selection of acceptable design and service stress limits associated with various loadings and combinations thereof, resulting from plant and system operating conditions and design basis events, natural phenomena, and site-related hazards. The relationship and application of the terms "design conditions," "plant operating conditions," "system operating conditions," and the formerly used term "component operating conditions," now characterized by four levels of service stress limits, require clarification.