Document: NUREG-0800
Document ID: 243e1ce7-857c-48e4-9eb7-6125311da9be
Document Type: srp
Title: RESIDUAL HEAT REMOVAL (RHR) SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070437.pdf
Revision Date: 2023-06
Chapter: 5
Section ID: 5.4.7
CFR Part: 
CFR Title: 

Content:
m II.B.8 of NUREG-0718 (Ref. 7) which involves description by the applicants of the degree to which the designs conform to the proposed interim rule on degraded core accidents (CPs only).76 d. Meeting Action Plan item III.D.1.1 of NUREG-0737 (Ref. 8) and NUREG-0718 (Ref. 7) which involves primary coolant sources outside of containment (CPs and OLs).77 45. When the RHR system is used to control or mitigate the consequences of an accident, it 78 must meet the design requirements of an engineered safety feature system. This includes meeting the guidelines of Regulatory Guide 1.1 regarding net positive suction head. Technical Rationale:79 The technical rationale for application of the above acceptance criteria to the residual heat removal system is addressed 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 residual heat removal from the reactor core which is necessary for maintaining 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; position C.1 provides guidance for safety related portions 5.4.7-9 DRAFT Rev. 4 - April 1996 and position C.2 provides guidance for 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. 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