Document: NUREG-0800
Document ID: c5cd8519-169f-4fec-9d25-9ddb3ba73f52
Document Type: srp
Title: RESIDUAL HEAT REMOVAL (RHR) SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070550002.pdf
Revision Date: 2023-06
Chapter: 5
Section ID: 5.4.7
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Content:
nts not designed to an ultimate rupture strength at least equal to the normal RCS operating pressure. 23. Some advanced light-water reactor (ALWR) designs make extensive use of passive systems to meet regulatory requirements. Often, they include a nonsafety-related active system for use during normal plant operation and to provide defense in depth to the safety-related passive system. The nonsafety-related active systems are the first line of defense to reduce challenges to the passive systems in the event of transients or plant upsets. The extensive use of safety-related passive systems and the nonsafety-related active system design philosophy presents a departure from previous licensing practices. Therefore, in SECY-94-084, the staff developed new requlatory and review guidance for a reliability assurance program to establish the regulatory treatment of nonsafety systems. Among other functions, ALWR designs have used the design philosophy of safety-related passive systems and nonsafety-related active systems for RHR. When reviewing such a design, the reviewer should use SECY-94-084 to determine the amount of regulatory oversight necessary. 24. For review of a DC application, the reviewer should follow the above procedures to verify that the design, including requirements and restrictions (e.g., interface requirements and site parameters), set forth in the final safety analysis report (FSAR) meets the acceptance criteria. DCs have referred to the FSAR as the design control document (DCD). The reviewer should also consider the appropriateness of identified COL action items. The reviewer may identify additional COL action items; however, to ensure these COL action items are addressed during a COL application, they should be added to the DC FSAR. For review of a COL application, the scope of the review is dependent on whether the COL applicant references a DC, an early site permit (ESP) or other NRC approvals (e.g., manufacturing license, site suitability report or