Document: NUREG-0800
Document ID: cf61f16a-4e82-42da-8333-e100f557fd60
Document Type: srp
Title: PLANT DESIGN FOR PROTECTION AGAINST POSTULATED PIPING FAILURES IN
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070550032.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.6.1
CFR Part: 
CFR Title: 

Content:
ings indicating that the design meets the intent of the acceptance criteria are accepted. However, there may be cases where engineering judgment and independent staff analyses are needed to verify the capability of structures and components to withstand the effects of a pipe rupture. B. SAR information, as supplemented by engineering sketches or drawings where necessary, is reviewed to determine that fluid system piping between containment isolation valves conforms to item B.2.c. of BTP 3-3. This includes piping penetrations between single and dual barrier containments that may have enclosing protective structures. The review is mainly performed on a comparative basis in this SRP Section. These piping details are reviewed to verify the design limits, break locations, and dynamic effects under SRP Section 3.6.2 and BTP 3-4 3. The results of the applicant's evaluation of the environmental consequences of postulated piping failures of high and moderate energy fluid piping systems are reviewed. The type and location of each postulated piping failure (i.e., longitudinal or circumferential) in either a high or moderate energy system will be reviewed by the organization responsible for the mechanical engineering reviews on the basis of BTP 3-4; however, full-circumferential breaks in non-seismic moderate energy piping should be considered in addition to the breaks postulated in BTP 3-4. The review will be based upon the information provided by applicants in the SAR concerning the effects of postulated failures on essential equipment and the ability of the plant to be safely shut down, as described in item B.3. of BTP 3-3. The reviewer verifies that the applicant's evaluation has properly considered the following points, and in certain cases, as necessary, performs an independent evaluation, especially with regard to single failure analyses. A. The reviewer verifies the applicant's plant arrangements and design features using layout drawings to ensure that all potentially