Document: NUREG-0800
Document ID: 62485d6f-6b2a-4360-acb5-f874d2adc406
Document Type: srp
Title: PIPING SYSTEMS AND COMPONENTS - INSPECTIONS, TESTS,
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1808/ML18088A069.pdf
Revision Date: 2023-06
Chapter: 14
Section ID: 14.3.3
CFR Part: 
CFR Title: 

Content:
SAR, and (D) SSCs are protected or qualified to withstand the environmental effects of postulated failures, which is a subject of the review identified in SRP Section 3.11. The acceptance criteria for the Pipe Break Hazards Analysis Report should include the conclusion that, for each postulated piping failure, the reactor can be safely shut down and maintained in a cold shutdown condition without offsite power. For an as-designed Pipe Break Hazards Analysis Report ITAAC, the Design Commitment should specify that safety-related SSCs are protected against the dynamic and environmental effects associated with postulated failures in high- and moderate-energy piping systems. (Note: Protection against dynamic effects is not required for high-energy, ASME Code Section III Class 1 and 2 piping and interconnected equipment nozzles for which LBB criteria applies). The ITA should specify that a pipe break hazards analysis will be performed to evaluate the effects of postulated failures of high- and moderate-energy piping systems on nearby safety-related SSCs. The Acceptance Criteria should specify that a Pipe Break Hazards Analysis Report exists and concludes that the as-designed safety-related SSCs will be protected against: (A) the dynamic effects associated with postulated failures in high-energy piping systems, and (B) the environmental effects associated with postulated failures in high- and moderate-energy piping systems. Detailed information that supports this ITAAC should be included in DCD Tier 2, Chapter 3. If the design uses LBB methods, a fourth ITAAC should require that an LBB evaluation report exists and concludes that the LBB acceptance criteria are satisfied for the as-built piping and piping materials. Bounding limits should be specified in Tier 2 using 14.3.3−8 Draft Revision 1 – September 2018 preliminary piping analysis results to establish a window of acceptable piping stress values for selected piping materials. The ITAAC should verify that these