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:
ive 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 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) . 61 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) . 62 4. The combined reactivity control system capability associated with ECCS must meet the requirements of GDC 27 (Ref. 5) and should conform to the recommendation of 63 Regulatory Guide 1.47 (Ref. 11) . The primary mode of actuation for the ECCS must 64 be automatic, and actuation must be initiated by signals of suitable diversity and DRAFT Rev. 3 - April 1996 6.3-8 redundance. Provisions should also be made for manual actuation, monitoring, and control of the ECCS from the reactor control room. 5. The design of the ECCS should conform to the recommendations of Regulatory Guide 1.1 (Ref. 9) . 65 6. Design features and operating procedures, designed to prevent damaging water hammer due to such mechanisms as voided discharge lines and water entrainment in steam lines shall be provided, in order to meet the requirements of General Design Criterion 4 (Ref. 17) . 66 7. The design of those portions of the system which are not safety related, whose failures could have an adverse effect on the ECCS system, must be in accordance with GDC 2 (Ref. 2) , and acceptance is based on meeting Position C2 of Regulatory Guide 1.29 67 (Ref. 10) . 68 8. Interfaces between the ECCS and component or service water systems must be such that operation of one does not interfere with, and provides proper support (where required) for, the other.