Document: NUREG-0800
Document ID: 47be7233-5326-4a7d-a9c5-f3b91d565a72
Document Type: srp
Title: MINIMUM CONTAINMENT PRESSURE ANALYSIS FOR EMERGENCY CORE
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070492.pdf
Revision Date: 2023-06
Chapter: 6
Section ID: 6.2.1.5
CFR Part: 
CFR Title: 

Content:
ents or an ECCS evaluation model developed in conformance with 10 CFR 50, Appendix K. SCSB accepts the analysis if either of the following requirements are met as they relate to the postulated minimum containment pressure following a loss-of-coolant accident: 1. 10 CFR 50.46(a)(1)(i) if an acceptable ECCS evaluation model that realistically describes the behavior of the reactor during loss-of-coolant accidents is used, or; 2. 10 CFR 50.46(a)(1)(ii) if an ECCS evaluation model developed in conformance with 10 CFR 50, Appendix K is used. 10 CFR 50, Appendix K, paragraph I.D.2 requires that the containment pressure used to evaluate the performance capability of a PWR emergency core cooling system shall not exceed a pressure calculated conservatively for that purpose. Specific criteria that pertain to minimum containment pressure analysis for ECCS performance studies are indicated below: a. In meeting the requirements of 10 CFR 50.46(a)(1)(i), the model used to determine minimum containment pressure for ECCS studies should comply with Regulatory Guide 6.2.1.5-3 DRAFT Rev. 3 - April 1996 1.157. Specifically, Regulatory Guide 1.157, Position C.3.12.1 describes acceptable containment pressure models for ECCS performance analysis.10 b. In meeting the requirements of 10 CFR Part 50.46(a)(1)(ii), the following specific criteriaThe guidelines given below indicate the conservatism that analyses of the 11 containment response to loss-of-coolant accidents should have for determining the minimum containment pressure for ECCS performance capability studies: (1). Calculations of the mass and energy released during postulated loss-of-coolant 12 accidents should be based on the requirements of Appendix K to 10 CFR Part 50(Ref. 2). 13 (2). Branch Technical Position CSB 6-1, "Minimum Containment Pressure Model for PWR ECCS Performance Evaluation," delineates the calculational approach that should be followed to assure a conservative prediction of the minimum containment pressure.