Document: NUREG-0800
Document ID: 79a58ec7-7baf-4632-9d7a-fc95a1e736c1
Document Type: srp
Title: -22
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1404/ML14043A231.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.9.3
CFR Part: 
CFR Title: 

Content:
Revision 3 – April 2014 (iv) Service Limit D. (1) Code Class 1, 2, and 3 components, component supports, and core support structures shall meet a service stress limit not greater than Level D when subjected to the appropriate combination of loadings resulting from (1) sustained loads, (2) either the DBPB, MS/FWPB, or LOCA, and (3) and SSE. (2) The DBPB, MS/FWPB, and LOCA include loads from the postulated pipe breaks, themselves, and also any associated system transients or dynamic effects resulting from the postulated pipe breaks. Asymmetric blowdown loads on PWR primary systems should be incorporated per NUREG-0609. 5 FUNCTIONAL CAPABILITY AND OPERATIONAL READINESS A. Active Pumps and Valves. SRP Section 3.10 provides guidance to reviewers to ensure that applicants demonstrate that pumps or valves, as supported, can adequately sustain the designated combined service loadings at a stress level bounded by the specified service limit. 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 operational readiness are addressed in SRP Section 3.9.6. B. Snubbers. The functionality and operational readiness 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 operational readiness of snubbers. C. Functional Capability of Class 1, 2 and 3 Piping. The