Document: NUREG-0800
Document ID: d0e1f2cb-f296-449d-9f9a-85a571917a44
Document Type: srp
Title: EMERGENCY CORE COOLING SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052340709.pdf
Revision Date: 2023-06
Chapter: 6
Section ID: 6.3
CFR Part: 
CFR Title: 

Content:
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: In regard to the ECCS acceptance criteria (Ref. 1), the five major performance criteria deal with: 1. Peak cladding temperature. 2. Maximum calculated cladding oxidation. 3. Maximum hydrogen generation. 4. Coolable core geometry. 5. Long-term cooling. These areas are reviewed as a part 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 is evaluated under this SRP section. The ECCS must meet the requirements of GDC 35 (Ref. 6). The system must have alternate sources of electric power, as required by GDC 17 (Ref. 4), and must be able to 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 dur- ing the short term immediately following an accident, or a single active or passive failure during the long-term recirculation cooling phase following an accident. The ECCS must be designed to permit periodic inservice inspection of important components, such as spray rings in the reactor pressure vessel, water injection nozzles, piping, pumps, and valves in accordance with the requirements of GDC 36 (Ref. 7). The ECCS must be designed to permit testing of the operability of the system throughout the life of the plant, including the full operational sequence that brings the system into operation, as required by GDC 37 (Ref. 8). The combined reactivity control system capability associated with ECCS must meet the requirements of GDC 27 (Ref. 5) and should conform to the recommenda- tion of Regulatory Guide 1.47 (Ref. 11). The primary mode of actuation for the ECCS must be automatic, and actuation must be initiated by signals of suitable diversity and redundance. Provisions should