Document: NUREG-0800
Document ID: eb0ea00d-43e4-45d1-8a5e-4daa4263d2cf
Document Type: srp
Title: EMERGENCY CORE COOLING SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070550068.pdf
Revision Date: 2023-06
Chapter: 6
Section ID: 6.3
CFR Part: 
CFR Title: 

Content:
e such that the core remains amenable to cooling, and that the calculated cladding oxidation and hydrogen generation meet the specified performance criteria. Meeting the requirements of GDC 35 ensures that the ECCS, assuming a single failure, can provide core cooling under accident conditions sufficient to maintain the core in a coolable geometry and to minimize the production of hydrogen due to reaction of water with the fuel cladding. 7. Compliance with GDC 36 requires that the emergency core cooling systems be designed to allow for periodic inspections of important components to ensure the integrity and capability of the system. GDC 36 is applicable because the ECCS system arrangements must be designed such that adequate clearances are available to conduct periodic inspections of important components. Conduct of periodic inspections is necessary to show that important components of the ECCS systems are being maintained within their design basis specifications and that no significant deterioration is occurring in the systems. Meeting the requirements of GDC 36 enhances plant safety by ensuring that important ECCS components can be inspected and will be capable of operating as designed to cool the core under accident conditions. 8. Compliance with GDC 37 requires that the emergency core cooling systems be designed to allow for comprehensive periodic pressure and functional testing. GDC 37 is applicable because the ECCS is required to undergo periodic pressure testing to verify the structural and leak-tight integrity of important components. Periodic functional testing of the ECCS verifies that the systems will operate as designed including the full operational sequence necessary to initiate ECCS operation. Periodic functional test programs, such as the ECCS pump and valve testing, are premised upon the establishment of a reference set of parameters (based upon design specifications) and a consistent test method to allow for the detection of significant system