Document: NUREG-0800
Document ID: 97b395a8-6e49-47d5-a249-28113b429fe3
Document Type: srp
Title: MASS AND ENERGY RELEASE ANALYSIS FOR POSTULATED SECONDARY
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0706/ML070620010.pdf
Revision Date: 2023-06
Chapter: 6
Section ID: 6.2.1.4
CFR Part: 
CFR Title: 

Content:
50 will ensure that containment integrity is maintained under the most severe secondary system pipe rupture, thus precluding the release of radioactivity to the environment. 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 provide an acceptable method of complying with the relevant NRC requirements identified in Subsection II. 1. Sources of Energy. The reviewer evaluates the sources of energy identified by the applicant in the analyses of steam and feedwater line break accidents to ensure that the sources listed in Subsection II of this SRP section have been considered. The reviewer also examines the assumptions of the secondary coolant system pipe break analysis to determine whether the applicant has identified the “worstcase” pipe break accident and completed the analysis in a conservative manner from the standpoint of containment pressure and temperature. This review involves the proposed methods and models used for blowdown analyses. The reviewer will evaluate the acceptability of the approach used by the applicant based on the acceptance criteria in Subsection II of this SRP section. 2. Mass and Energy Release Rate. The reviewer evaluates the applicant’s calculations for main feedwater flow into the affected steam generator to determine whether the flow rate is conservatively maximized. If the applicant’s steamline break model calculates liquid entrainment, the reviewer determines the validity of the experimental data provided to support the entrainment calculation. The reviewer will also ascertain whether the analysis considered the effect of steam separators located upstream from the postulated steamline break. The reviewer evaluates comparisons to