Document: NUREG-0800
Document ID: d5452e7b-1e61-498b-9e3d-71073b3328ef
Document Type: srp
Title: LEAK-BEFORE-BREAK EVALUATION PROCEDURES
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0302/ML030280295.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.6.3
CFR Part: 
CFR Title: 

Content:
e found in NUREG-1061, Volume 3, Chapter 5, dated November 1984, and entitled "Report of the U.S. Nuclear Regulatory Commission Piping Review Committee" and subtitled "Evaluation of Potential for Pipe Breaks". IV. EVALUATION FINDINGS The reviewer verifies that sufficient information has been provided and that his review supports conclusions of the following type, to be included in the staff's safety evaluation report: The staff evaluation determines on a plant specific and piping system specific basis that the acceptance criteria are satisfied and, therefore that dynamic effects of pipe rupture may be eliminated from design consideration. When dynamic effects of pipe rupture are eliminated, protective devices such as pipe whip restraints and jet impingement barriers are no longer needed, and other related design changes can take place. The staff determination is based on the following: 3.6.3-9 1. That water hammer, corrosion, creep, fatigue, erosion, environmental conditions and indirect sources are remote causes of pipe rupture. 2. That a deterministic fracture mechanics evaluation has been completed and approved by the the staff. 3. That leak detection systems are sufficiently reliable, redundant, diverse and sensitive, and that margin exists to detect the throughwall flaw used in the deterministic fracture mechanics evaluation. V. IMPLEMENTATION The following is intended to provide guidance to applicants and licensees regarding the NRC staff's plans for using this SRP section. Except in those cases in which the applicant proposes an acceptable alternative method for complying with specific portions of the Commission's regul~tions, the methods described herein will be used by the staff in its evaluation of conformance with Commission regulations. Only dynamic effects of postulated pipe ruptures may be eliminated when leak before-break technology is shown to be applicable. Requirements for con tainment design, emergency core cooling system performance and