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:
a loss occur. b. The reviewer verifies that the applicant/licensee has the capability of continuously monitoring RHR system performance 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. 116 20. The reviewer verifies that new light water reactor applicants have ensured high reliability of the shutdown decay heat removal system as follows (See References 10 through 13 and 25): a. The reviewer verifies that design provisions exist to help ensure 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 availability of reliable systems for decay heat removal. 5.4.7-15 DRAFT Rev. 4 - April 1996 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).117 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).118 21. The reviewer verifies that the applicant has reviewed their RHR system design configurations to identify any unisolable piping connected to the RCS that could be subjected to temperature distributions that could result in unacceptable thermal stresses. This review should consider the potential for thermal stratification, thermal cycling and thermal fatigue, given the RHR system configuration. The reviewer verifies that appropriate action has been taken, where such piping is identified, to ensure that the piping will not be subjected to unacceptable thermal stresses (Reference 20). This review should focus on RHR system configurations;