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
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CFR Title: 

Content:
measure and transmit required information. The reviewer uses a failure modes and effects analysis (or similar system safety analysis) provided in the SAR to determine conformance to the single failure criterion. 2. Using the comparison tables of SAR Section 1.3, the reviewer compares the RHR system to the designs and capacities of such systems in similar plants to confirm that there are no unexplained departures from previously reviewed plants. Where possible, comparisons should be made with actual performance data from similar systems in operating plants. 3. From the system description and P&IDs, the reviewer determines that the isolation requirements of BTP 5-4 are satisfied. 4. The reviewer determines that the RHR system design has provisions to prevent damage to the RHR pumps in accordance with BTP 5-4. The reviewer checks the isolation valves in the suction line for potential closure, net positive suction head requirements, pump runout, and potential loss of miniflow line during pump testing. If operator action is required to protect the pumps, the reviewer evaluates the instrumentation that will alert the operator and the adequacy of the timeframe for operator action. 5.4.7-11 Revision 5 - May 2010 The reviewer verifies that the applicant has considered the following guidance regarding the design of the RHR miniflow systems necessary to ensure safety-related RHR pump protection (see NRC Generic Letter 89-04 and Bulletins 86-01 and 88-04): A. Ensure that the minimum cooling flow provided for the RHR pumps is adequate under all conditions, including verification that the system configuration precludes pump-to-pump interaction during miniflow operation that could result in dead-heading one or more of the pumps. The miniflow must be sufficient to prevent damage to the pump(s) under all conditions. B. The miniflow system should be designed such that the miniflow function can be performed assuming a single failure. A single failure should not result in conditions