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:
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 degradation. 6.3-10 Revision 3 - March 2007 Meeting the requirements of GDC 37 enhances plant safety by ensuring that important ECCS components can be tested and will remain capable of operating as designed to provide core cooling under postulated accident conditions. 9. Compliance with 10 CFR 50.46, requires that the ECCS be designed so that the calculated cooling performance is in accordance with an acceptable evaluation model or alternately a model in conformance with the features of Appendix K. 10 CFR 50.46 is applicable because the primary function of the ECCS is to provide emergency core cooling and negative reactivity addition in the event of a LOCA resulting from a break in the primary reactor coolant system. The primary ECCS safety functions are comprehensively modeled and evaluated for breaks up to and including the double- ended severance of a reactor coolant pipe to show that the ECCS will limit the peak clad temperature to below 1204°C (2200°F) and ensure that the core will remain in place and substantially intact with its essential heat transfer geometry preserved. Meeting the requirements of 10 CFR 50.46, enhances plant safety by ensuring that the ECCS is designed and evaluated in such a way that the calculated core cooling performance after a LOCA conforms to critical criteria necessary to show that the core geometry will remain amenable to cooling and that long-term decay heat removal will be provided. III. REVIEW PROCEDURES The reviewer will select material from the procedures described below, as may be appropriate for a particular case. These review procedures are based on the identified SRP acceptance criteria. For deviations from these acceptance criteria, the staff should review the applicant’s evaluation of how the proposed alternatives