Document: NUREG-0800
Document ID: ea7ce8f5-32bf-4d8c-a653-e964bff0ef48
Document Type: srp
Title: EMERGENCY CORE COOLING SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070448.pdf
Revision Date: 2023-06
Chapter: 6
Section ID: 6.3
CFR Part: 
CFR Title: 

Content:
CCS system is absolutely essential in the event of a LOCA. B. Branch Position 1. The single active failure criterion defined in (a) and (b) above will be applied in evaluating the design of the piping systems that connect the safety injection pumps to the RWST (BWST) and the containment sumps. 2. The piping systems, including valves, shall be designed to satisfy the requirements listed below without the need to disconnect the power to any valve. 3. The valves and piping between the RWST (or BWST) and the safety injection pumps must be arranged so that no single failure will prevent the minimum flow to the core required to satisfy 10 CFR Part 50, §50.46. 4. The valves and piping between the RWST (or BWST) and safety injection pumps must be arranged so that no single active failure will result in damage to pumps 6.3-27 DRAFT Rev. 3 - April 1996 such that the minimum flow requirements for long-term core and containment cooling after a LOCA are not satisfied. 5. The valves and piping that connect the RWST (or BWST) and the containment sumps(s) to the safety injection pumps must be arranged so as not to preclude 187 automatic switchover from the injection mode of ECCS operation to recirculation cooling from the sump. These piping systems must be arranged so that the differential pressure between the sump and the RWST (or BWST), even if there is a single active failure, will not result in a loss of core cooling or a path that permits release of radioactive material from the containment to the environment. C. Implementation188 1. Applicants for a construction permit for which an SER was published prior to April 16, 1975 will not be required to comply with the provisions of this item.189 2. For plants with an operating license issued prior to July 1981 and operating license applications docketed prior to July 1981 the position will not be completely applied. Specifically, locking out power to valves will be permitted. For most plants it is expected that this will be