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:
dent 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 affected essential systems and components have been considered with respect to the effects of an assumed pipe break. B. The reviewer evaluates the effects of postulated piping failures as determined from the information given in the SAR. The reviewer will confirm the results of the applicant's evaluations by performing a comparative, but abbreviated as appropriate, failure modes and effects analysis that includes the considerations given in item B.3.b. of BTP 3-3 for the following effects: i. The availability of offsite power. ii. The effects of a single active component failure in systems necessary to mitigate consequences of the postulated piping break. iii. Permissible exclusions to (ii.) above based upon the provision given in item B.3.b.(3) of BTP 3-3 for certain dual purpose moderate energy systems. 3.6.1-9 Revision 3 - March 2007 iv. The considerations involved in the selection of available systems to mitigate the consequences of the piping failure. C. The reviewer will verify from a review of arrangement drawings that control room habitability or access to necessary surrounding areas is not jeopardized as a consequence of the postulated piping failure. D. The reviewer evaluates the applicant's analysis of the postulated failure of non-seismic Category I piping systems by performing a failure modes and effects analysis using SAR information and engineering sketches as necessary. 4. Systems defined in Appendix A to BTP 3-3 as "essential systems" are those that are needed to shut down the reactor and mitigate the consequences of the pipe break for a given postulated piping break without offsite power. However, depending upon the type and location of the postulated pipe break, certain safety equipment may not be classified as "essential" for that particular event