Document: NUREG-0800
Document ID: bc3eaf7e-9aea-4373-9278-593b1da53770
Document Type: srp
Title: Revision 3 - March 2007
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0707/ML070740429.pdf
Revision Date: 2023-06
Chapter: 6
Section ID: 6
CFR Part: 
CFR Title: 

Content:
lear Regulatory Commission, Washington, DC 20555, Attention: Reproduction and Distribution Services Section, or by fax to (301) 415-2289; or by email to DISTRIBUTION@nrc.gov. Electronic copies of this section are available through the NRC's public Web site at http://www.nrc.gov/reading-rm/doc-collections/nuregs/staff/sr0800/, or in the NRC's Agencywide Documents Access and Management System (ADAMS), at http://www.nrc.gov/reading-rm/adams.html, under Accession # ML070740429. NUREG-0800 U.S. NUCLEAR REGULATORY COMMISSION STANDARD REVIEW PLAN BRANCH TECHNICAL POSITION 6-5 CURRENTLY THE RESPONSIBILITY OF REACTOR SYSTEMS PIPING FROM THE RWST (OR BWST) AND CONTAINMENT SUMP(S)TO THE SAFETY INJECTION PUMPS REVIEW RESPONSIBILITIES Primary - Organization responsible for the review of Containment Integrity Secondary - None A. BACKGROUND Current PWRs utilize the refueling water storage tank (RWST) or the borated water storage tank (BWST) as the sole source of water for the safety injection pumps during the first 20 to 40 minutes of any accident that trips a safety injection signal. Since acceptable results of safety analyses of the accidents are based on the operation of a minimum number of these pumps interruption of this water supply for even a short period of time could result in unacceptably high fuel and cladding temperatures if the safety injection pumps fail because of cavitation or overheating. 1. General Design Criteria 35 requires that the emergency core cooling system have suitable redundancy in components and features and suitable interconnections to assure the system safety function can be accomplished assuming a single failure. The principal problem appears to be a definition of single failure. ANSI N658, “Single Failure Criteria for PWR Fluid Systems,” defines an active failure as: BTP 6-5-2 Revision 3 - March 2007 A. An active failure is a malfunction, excluding passive failures, of a component which relies on mechanical movement to complete its intended