Document: NUREG-0800
Document ID: c5cd8519-169f-4fec-9d25-9ddb3ba73f52
Document Type: srp
Title: RESIDUAL HEAT REMOVAL (RHR) SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070550002.pdf
Revision Date: 2023-06
Chapter: 5
Section ID: 5.4.7
CFR Part: 
CFR Title: 

Content:
a low pressure-temperature operation phase. In the event of a loss of offsite electrical power, the initial cooldown phase is accomplished through the reactor core isolation cooling (RCIC) system and the safety/relief valves. The RHR system usually supports the low pressure-temperature mode of operation. However, certain single failures can render the RHR system inoperative. In that event, two alternate systems that use components of the RCIC and RHR system are available to bring the reactor to cold shutdown conditions. The scope of review of these systems for the plant included piping and instrumentation diagrams, equipment layout drawings, failure modes and effects analysis, and design performance specifications for essential components. The 5.4.7-15 Revision 4 - March 2007 review has included the applicant’s proposed design criteria and design bases for these systems, 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 General Design Criteria 2, 4, 5, 19, and 34 and 10 CFR 50.34(f)(2)(xxvi): A. The applicant has met General Design Criterion 2 with respect to Regulatory Position C-2 of Regulatory Guide 1.29 concerning the seismic design of structures, systems, and components (SSCs) whose failure could cause an unacceptable reduction in the capability of the RHR system. B. The applicant has met General Design Criterion 4 with respect to dynamic effects associated with flow instabilities and loads (e.g., water hammer). C. The applicant has met the requirements of General Design Criterion 5 with respect to the sharing of SSCs by demonstrating that such sharing does not significantly impair the ability of the RHR system to perform its safety function, including, in the event of an accident to one unit, an orderly shutdown and cooldown of the remaining units. D. The applicant has met