Document: NUREG-0800
Document ID: ed948426-dd77-4047-be5e-2b7ab22de3f5
Document Type: srp
Title: FEEDWATER SYSTEM PIPE BREAK INSIDE AND OUTSIDE CONTAINMENT (PWR)
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070550009.pdf
Revision Date: 2023-06
Chapter: 15
Section ID: 15.2.8
CFR Part: 
CFR Title: 

Content:
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. The procedures are used during reviews of construction permit, operating license, and COL applications. During the construction permit review the values of system parameters and setpoints in the analysis are preliminary in nature and subject to change. At the operating license or COL review stage, final values should be in the analysis, and the reviewer should compare these to the limiting safety system settings in the proposed technical specifications. 1. The values of system parameters and initial core and system conditions as input to the model are reviewed and compared to the initial conditions listed in subsection II of this SRP section. Of particular importance are the reactivity coefficients and control rod worths in the applicant's analysis and the variation of moderator temperature, void, and Doppler coefficients of reactivity with core life. The applicant’s justification for selection of the core burn-up yielding the minimum margins is evaluated. Reactivity parameter values in the applicant's analysis also are reviewed. 2. Analytical models should be of sufficient detail to simulate the reactor coolant (primary), steam generator (secondary), and auxiliary systems. The applicant’s equations, sensitivity studies, proposed models, and justification for methods as conservative 15.2.8-10 Revision 2 - March 2007 compared to appropriate test data are reviewed. The pressurizer is of particular importance in the modeling of the over-pressure transient, the likely result of a large feedwater line break. Assumptions for pressurizer spray performance if credited should be reviewed as well as heat transfer by condensation within the