Document: NUREG-0800
Document ID: fb538e14-08a0-4d3f-a974-8170cbfe0b5b
Document Type: srp
Title: ASME CODE CLASS 1, 2, AND 3 COMPONENTS,
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052340603.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.9.3
CFR Part: 
CFR Title: 

Content:
pools shall also consider the applicable pool dynamic loads on the safety 1 relief valve system. Stress computations and stress limits must be in accord with applicable rules of the Code. 3. Component Supports a. The component support designs should provide adequate margins of safety under all combinations of loadings. The combination of load- I ings (including system operating transients) considered for each component support within a system, including the designation of the appropriate service stress limit for each loading combination should meet the criteria in Appendix A and Regulatory Guides 1.124 and 1.130 (References 7 and 8). Component supports of active pumps and valves should be considered in context with the other features of the operability assurance pro- gram as presented in SRP Section 3.10. If the component support affects the operability requirements of the supported component, then deformation limits should also be specified. Such deformation limits should be compatible with the operability requirements of the components supported and incorporated into the operability assurance program. In establishing allowable deformations, the possible movements of the support base structures must be taken into account. b. Where snubbers are utilized as supports for safety-related systems and components, acceptable criteria for snubber operability assurance should contain the following elements: (1) Structural Analysis and Systems Evaluation. Systems and components which utilize snubbers as shock and vibra- tion arrestors must be analyzed to ascertain the interaction of such devices with the systems and components to which they are attached. Snubbers may be used as shock and vibration arrestors and in some instances as dual purpose snubbers. When used as a vibration arrestor or dual purpose snubbers, fatigue strength must be considered. Important factors in the fatigue evaluation include: (i) unsupported system component movement or amplitude, (ii) force imparted