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:
ct to 10 CFR 50.34(f), with respect to the provisions for a leakage detection and control program to minimize the leakage from those portions of the ECCS outside of the containment that contain or may contain radioactive material following an accident.53 Specific acceptance criteria, Regulatory Guides, and Task Action Plan items that provide 54 information, recommendations, and guidance and in general describe a basis acceptable to the staff that may be used to implement the requirements of the Commission regulations identified above are as follows: 1. In regard to the ECCS acceptance criteria of 10 CFR 50.46 (Ref. 1) , the five major 55 56 performance criteria deal with: a1. Peak cladding temperature. b2. Maximum calculated cladding oxidation. c3. Maximum hydrogen generation. d4. Coolable core geometry. e5. Long-term cooling. Guidance, procedures and methods that are acceptable for meeting the requirements for a realistic or best-estimate evaluation model for ECCS performance can be found in Regulatory Guide 1.157. Alternatively, Appendix K to 10 CFR Part 50 contains guidance for conservative ECCS evaluation models. These areas are reviewed as a part 57 of the effort associated with the LOCA analysis (SRP Section 15.6.5). However, the impact of various postulated single failures on the operability of the ECCS, ECCS response times, break locations (including ECCS break locations), and break sizes impacting ECCS capabilities are is evaluated under this SRP section. 58 2. The ECCS must meet the requirements of GDC 35 (Ref. 6) . The system must have 59 alternate sources of electric power, as required by GDC 17 (Ref. 4) , and must be able to 60 withstand a single failure. The ECCS should retain its capability to cool the core in the event of a failure of any single active component during the short term immediately following an accident, or a single active or passive failure during the long-term recirculation cooling phase following an accident. 3. The ECCS must be