Document: NUREG-0800
Document ID: 33a67dd5-21e3-4458-9085-803f75466a73
Document Type: srp
Title: OVERPRESSURE PROTECTION
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070540076.pdf
Revision Date: 2023-06
Chapter: 5
Section ID: 5.2.2
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Content:
NRC staff. American National Standards Institute (ANSI)/American Nuclear Society (ANS) 51.1 and ANSI/ANS 52.1, respectively, include useful discussions of overall plant design requirements. Additional consideration should be given to License Amendment Requests (LARs) which may impact analyzed accident scenarios that result in RCPB overpressure. The validity of the acceptance criteria specified in this SRP section should be confirmed with regards to a LAR. The specific areas of review are as follows: 1. System Design. The staff assesses information on the design of the overpressure protection system, including any subsystems and supporting systems, to gain familiarity with the design and operation of the system. Such information includes the following: A. For boiling water reactors (BWRs), the area of review for operation at power includes SRVs on the main steamlines and piping from these valves to the suppression pool. The BWR design also may incorporate interfacing systems, such as an isolation condenser, to prevent challenges to the SRVs during normal operations. The BWR description of the basic design concept; the systems, subsystems, and support systems providing overpressure protection to the RCPB; the components and instrumentation employed in these systems; and process and instrumentation diagrams should be reviewed for power operation. B. For BWRs the areas of review do not inlcude any special area of review for low- temperature operation of the plant (startup, shutdown) because BWRs do not operate or perform maintenance in water-solid conditions. However, a cold overpressure incident occurred at a foreign BWR, of U.S. design, during test conditions, as outlined in Section 4 of NUREG-1511, Supplement 2. Therefore, the reviewer should confirm (1) that operation of the condensate and feedwater pumps, high-pressure injection control rod drive pumps, low-pressure coolant spray or injection system, high-pressure coolant spray system, or the standby liquid control