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:
ong-term coolant recirculation and decay heat removal systems, e.g., pump or valve overhaul, in the post-LOCA environment (including consideration of radioactivity). 8. The availability of an adequate source of water for the ECCS is confirmed, and the source volume, location, and susceptibility to failure (e.g., freezing) are evaluated. (RSB SRXB will request ASB SPLB review as required.) In PWRs, the piping from the 88 89 water source to the ECCS safety injection pumps is evaluated for conformance with Branch Technical Position RSB 6-1 (Ref. 13) . 90 6.3-13 DRAFT Rev. 3 - April 1996 9. The ECCS flow paths are reviewed to determine the extent to which flow from the ECCS pumps is diverted as a backup feature to other safeguards equipment (e.g., RHR, containment spray). The reviewer should confirm that the remaining portion of the flow provides abundant core cooling, despite the most severe single failure that affects ECCS flow. 10. For a boiling water reactor (BWR), the reactor coolant ADSautomatic depressurization systems isare reviewed utilizing the following additional procedures to verify compliance with the Acceptance Criteria: confirm the capability to satisfy LOCA pressure relief functions, including consideration of a single failure.91 a. The ADS systems, including electrical power supplies, are reviewed to verify they have sufficient independence, redundancy, and capability to allow the ADS to function properly assuming a single failure.92 b. The ADS design is reviewed to verify that actuation of the system can be completed automatically and that manual actuation is not required to assure adequate core cooling (see item II.K.3.18 of Reference 34).93 c. Design features and system analysis to verify performance of the ADS under all accident conditions are reviewed. The reviewer should verify the ADS can satisfy performance requirements without taking credit for non-safety-related equipment or instrumentation, and accounting for normal air (or nitrogen) leakage