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:
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 experimental data made by the applicant and makes comparisons to other available experimental data to determine the amount of conservatism in the mass and energy release models. 6.2.1.4-6 Revision 2 - March 2007 The reviewer examines the results of a spectrum of steamline breaks, beginning with the double-ended break and decreasing in area until no entrainment occurs, to ensure that the applicant has identified the steamline break size producing the highest containment temperature and pressure. The reviewer may perform confirmatory analyses of the containment pressure and temperature response to steam and feedwater line breaks inside the containment using thermal-hydraulic computer codes that the responsible reviewing organization for the subject application finds acceptable. 3. Single-Failure Analyses. The reviewer reviews analyses of postulated single failures of active components in the secondary systems, such as steam and feedwater line isolation valves and feedwater pumps, and determines whether the single failure that maximizes containment pressure and temperature has been selected. The reviewer requests the review of SRP Sections 3.2.1, 3.2.2, and 3.6.2 by the responsible organization as to the acceptability of nonsafety valves in limiting the mass and energy releases from the steam and feedwater systems. The reviewer also requests the organization responsible for SRP Section 10.4.9 to review the rationale for determining the time at which operator action can be relied upon to terminate auxiliary feedwater flow to the affected steam generator. For review of a DC application, the reviewer should follow the above procedures to verify that the design, including requirements and restrictions (e.g., interface requirements and site parameters), set forth in the final