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:
lass 1, 2, and 3 components, component supports, and Class CS core support structures shall meet a service limit not greater than Level 3.9.3-14 Rev. 1 - April 1984 C when subjected to the appropriate combination of loadings resulting from (1) sustained loads, and (2) the DBPB. (b) The DBPB includes loads from the postulated pipe break, itself, and also any associated system transients or dynamic effects resulting from the postulated pipe break. 1.3.4 Service Limit 0 (a) Class 1, 2, and 3 components, component supports, and Class CS 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. (b) 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. Asymme- tric blowdown loads on PWR primary systems shall be incorporated per NUREG-0609 (Reference 10). 2.0 OPERABILITY AND FUNCTIONAL CAPABILITY 2.1 Active Pumps and Valves SRP Section 3.10 (Reference 4) shall demonstrate that the pump or valve, as supported, can adequately sustain the designated combined service loadings at a stress level at least equal to the specified service limit, and can perform its safety function without impairment. Loads produced by the restraint of free end displacement and anchor point motions shall be included. 2.2 Snubbers The operability requirements specified for mechanical and hydraulic snubbers installed on safety-related systems is subject to review by the staff. When snubbers are used, their need shall be clearly established and their design criteria presented. 2.3 Functional Capability The design of Class 1, 2, and 3 piping components shall include a functional capability assurance program. This program shall demonstrate that the piping components, as supported, can retain