Document: NUREG-0800
Document ID: e89cc26c-d19a-42b8-818a-fb598c05ccee
Document Type: srp
Title: PLANT DESIGN FOR PROTECTION AGAINST POSTULATED PIPING FAILURES IN FLUID
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052340548.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.6.1
CFR Part: 
CFR Title: 

Content:
ety-related systems and components are outlined in this position, the preferred method of protection is based upon separation and isolation by plant arrangement. Past applications for CP & OL licenses contained plant layouts where safety-related equipment or structures were located near the main steam and feedwater high energy lines on the basis of utilization of the "break exclusion" design basis in these lines. In consideration of the large magnitude of potential energy stored in these (main steam and feed) systems 3.6.1-9 Rev. 2 - October 1990 during normal plant operation, BTP SPLB 3-1 is intended to give clear guidance on acceptable methods for protecting essential equipment from the | effects of postulated failures in these systems. B. BRANCH TECHNICAL POSITION 1. Plant Arrangement Protection of essential systems and components-/ against postulated piping failures in high or moderate energy fluid systems that operate during normal plant conditions and that are located outside of con- tainment, should be provided by items a., b., or c. below in order of their preference. a. Plant arrangements should separate fluid system piping from essential systems and components. Separation should be achieved by plant physical layouts that provide sufficient distances between essential systems and components and fluid system piping such that the full dynamic effects of any postulated piping failure therein (e.g., pipe whip, jet impingement, and the environmental conditions resulting from the escape of contained fluids as appropriate to high or moderate energy fluid system piping) cannot impair the integrity or operability of essential systems and components. (1) Even though portions of the main steam and feedwater lines meet the break exclusion requirements of item B.3.b of BTP EMEB 3-1, they should be separated from essential equipment. Designers are cautioned to avoid concentrating essential equipment in the break exclusion zone. Essential equipment must be protected from