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:
es proper support (where required) for, the other. In relation to these and other shared systems (e.g., emergency core cooling and containment heat removal systems), the RHR system must conform to GDC 5. 4. When the RHR system is used to control or mitigate the consequences of an accident, it must meet the design requirements of an engineered safety feature system. This includes meeting the guidelines of Regulatory Guide 1.82 regarding water sources for long term recirculation cooling following a loss-of-coolant accident. Technical Rationale The technical rationale for application of these acceptance criteria to the areas of review addressed by this SRP section is discussed in the following paragraphs: 1. GDC 2 requires that SSCs important to safety be designed to withstand the effects of natural phenomena, such as earthquakes, without the loss of capability to perform their safety functions. The RHR system is relied upon to provide removal of residual heat from the reactor core to maintain the reactor in a safe-shutdown condition. In addition, the RHR system may be capable of cooling the spent fuel pool. Regulatory Guide 1.29 provides guidance for determining which systems should be designated seismic Category I; Regulatory Position C.1 provides guidance for safety-related portions and Regulatory Position C.2 addresses nonsafety-related systems and components. Meeting the requirements of GDC 2 will enhance plant safety by ensuring that the RHR system will be available to cool the core and/or the spent fuel pool during and following a seismic event. 5.4.7-8 Revision 4 - March 2007 2. GDC 4 requires that SSCs important to safety be designed to accommodate the effects of and be compatible with the environmental conditions associated with normal operation, maintenance, testing, and postulated accident conditions, including such effects as pipe whip and jet impingement. The safety function of the RHR system is to transfer heat from the reactor to the environment during