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:
ure that the RCS will remain stable and controlled while in a reduced inventory condition. These measures include both prevention of a loss of RHR and enhanced monitoring requirements to ensure timely response to a loss of RHR, should such a loss occur. B. The reviewer verifies that the applicant/licensee has the capability of continuously monitoring RHR system performance and RCS characteristics important for core cooling whenever a RHR system is being used for cooling the RCS. C. The reviewer verifies that the RHR system has visible and audible indications of abnormal conditions in temperature, level, and RHR system performance parameters. 20. The reviewer verifies that new light-water reactor applicants have ensured high reliability of the shutdown decay heat removal system as follows (see SECY-90-016 and the associated staff requirements memorandum (SRM) dated June 26, 1990, SECY-93-087 and the associated SRM dated July 21, 1993, and NUREG-1449): 5.4.7-14 Revision 5 - May 2010 A. The reviewer verifies that design provisions exist to reasonably ensure the continuity of flow through the core and RHR system with low-liquid levels at the junction of the RHR system suction lines and the RCS (new PWR applicants only). B. The reviewer verifies that provisions exist to ensure the availability of reliable systems for decay heat removal. C. The reviewer verifies that the applicant has provided reliable measurements of liquid levels at the junction of the RHR system suction lines and the RCS (new PWR applicants only). D. The reviewer verifies that automatic closure interlocks for the RHR suction isolation valves, if provided, are designed in such a manner as to minimize inadvertent valve closure during system operation (new PWR applicants only). 21. The reviewer verifies that the applicant has reviewed its RHR system design configurations to identify any piping connected to the RCS that could be subjected to temperature distributions that could result in unacceptable