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
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CFR Title: 

Content:
nder TMI Action Plan Item II.B.8 will not be pursued further. 115. Integrated Impact #1015 The discussion covering 10 CFR 50.34(f)(2)(xxvi) and TMI Task Action Plan item III.D.1.1 is now covered by an individual review procedure step. SRP Draft Section 5.4.7 Attachment A - Proposed Changes in Order of Occurrence Item Source Description 5.4.7-41 DRAFT Rev. 4 - April 1996 116. Integrated Impact # 103 and 108 Review Procedures were added to address NRC staff guidance covering mid-loop operation contained in Generic Letter 88-17 and staff positions for evolutionary reactors found in SECY 90-016 and its associated staff requirements memorandum. These documents describe guidance specific to the RHR system that should be considered when operating in reduced inventory, mid-loop and shutdown conditions. This review was split into two sections the first section (step 19) covering all plants and specific PWRs (including evolutionary PWRs) and the second section (step 20) being applicable only to new PWRs. 117. Integrated Impacts # 103 and 105. Added a review procedure for new applicants to address RHR design specific aspects of the shutdown operations guidance. The review procedures address guidance covering mid-loop operations contained in SECY 90-016 and its associated staff requirements memorandum. New plant applicants should conduct studies to identify RHR design-specific vulnerabilities and weaknesses and then document design features to mitigate these vulnerabilities. Examples of design features utilized by evolutionary designs to address the concerns of generic safety issue 99 include instrumentation consistent with the guidance of Generic Letter 88-17 and suction isolation valves that do not have an auto-closure interlock (covered in step 20.d.). A reference to NUREG-1449 which documents the staff's evaluation of the shutdown and low-power issue was also added. 118. Integrated Impact # 108 Added a review procedure specifically addressing the RHR auto-closure interlock