Document: NUREG-0800
Document ID: 3d8f7691-e488-4083-af2f-eef689c0ec98
Document Type: srp
Title: ASME CODE CLASS 1, 2, AND 3 COMPONENTS AND COMPONENT SUPPORTS,
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0704/ML070430397.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.9.3
CFR Part: 
CFR Title: 

Content:
Stresses in valve bodies and pump casings should be limited to the particular material’s elastic limit when the pump or valve is subjected to the combination of normal operating loads, SSE and other applicable loads. Such demonstration provides assurance that pumps and valves can perform their safety function without impairment. Loads produced by the restraint of free end displacement and anchor point motions should be included. Functional design and qualification of active pumps and valves, and inservice testing programs to assess operability are addressed in SRP Section 3.9.6. B. Snubbers. The functionality and operability requirements specified for mechanical and hydraulic snubbers installed on safety-related systems are subject to review by the staff. When snubbers are used, their need should be clearly established and their design criteria presented. SRP Section 3.9.6 addresses inservice testing programs to assess operability of snubbers. C. Functional Capability of Class 1, 2, and 3 Piping Components. The design of Class 1, 2, and 3 piping components should include a functional capability assurance program. This program should be used to demonstrate that the piping components, as supported, can retain sufficient dimensional stability at service conditions so as not to impair the system's functional capability. The program may be based on tests, analysis, or a combination of tests and analysis. 3.9.3-22 Revision 2 - March 2007 The functional capability assurance program should incorporate the conclusions listed in Section 9 of NUREG-1367, "Functional Capability of Piping Systems." Functional capability of piping systems is reviewed in SRP Section 3.12. 6. TABLES A. Table I summarizes the guidance contained in this Appendix. The table illustrates plant events, system operating conditions, service loading combinations, and service stress limits and should be used in conjunction with the text of this appendix. B. Table II defines terms used in this Appendix. 7.