Document: NUREG-0800
Document ID: c755e557-3a72-423f-92bc-0f0270936e27
Document Type: srp
Title: RESIDUAL HEAT REMOVAL (RHR) SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1006/ML100680577.pdf
Revision Date: 2023-06
Chapter: 5
Section ID: 5.4.7
CFR Part: 
CFR Title: 

Content:
ed for the review of ITAAC. The review of ITAAC cannot be completed until after the completion of this section. IV. EVALUATION FINDINGS The reviewer verifies that the applicant has provided sufficient information and that the review and calculations (if applicable) support conclusions of the following type to be included in the staff's safety evaluation report (SER). The reviewer also states the bases for those conclusions. 1. For PWRs The RHR function is accomplished in two phasesCthe initial cooldown phase and the RHR system operation phase. In the event of a loss of offsite power, the initial phase of cooldown is accomplished through the auxiliary feedwater system and the atmospheric dump valves. This equipment is used to reduce the reactor coolant system temperature and pressure to values that permit operation of the RHR system. Section ___ of the SER discusses the review of the initial cooldown phase. The review of the RHR system operational phase is discussed below. The RHR system removes core decay heat and provides long-term core cooling following the initial phase of reactor cooldown. The scope of review of the RHR system for the plant included piping and instrumentation diagrams, equipment layout drawings, failure modes and effects analysis, and design performance specifications for essential components. The review included the applicant=s proposed design criteria and design bases for the RHR system, analysis of the adequacy of those criteria and bases, and conformance of the design to those criteria and bases. Based on the following, the staff concludes that the design of the RHR system is acceptable and meets the requirements of GDCs 2, 4, 5, 19, and 34 and 10 CFR 50.34(f)(2)(xxvi): A. The applicant has met GDC 2 with respect to Regulatory Position C-2 of RG 1.29 concerning the seismic design of SSCs whose failure could cause an unacceptable reduction in the capability of the RHR system. 5.4.7-16 Revision 5 - May 2010 B. The applicant has met GDC 4 with