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:
lyses 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. Fatigue evaluations and associated analyses of components and supports should be based on the design life of the plant. Environmental conditions which could have cumulative effects that could adversely affect the design margins that are built into the ASME fatigue design curves should also be considered. To avoid fatigue failure during the life of the plant, unisolable sections of piping connected to the RCS that are subject to stresses from temperature stratification or temperature oscillations as well as other typical piping stresses, (including piping that may be rendered susceptible to these conditions through leaking valves), should be identified and designed to withstand combined stresses caused by various loads and the worst temporal and spatial distributions of temperature to