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
CFR Part: 
CFR Title: 

Content:
as appropriate. iv. The reviewer identifies all of the reactor trip signals that occur during overpressure transients, including their setpoints and setpoint tolerances. The reviewer verifies that the second reactor trip signal, under worst-case conditions during an overpressure transient, is adequate to provide overpressure protection to the RCPB in conjunction with the installed overpressure protection systems or devices. v. The reviewer examines all transients analyzed in the accident analysis section of the SAR that result in an increase in the pressure experienced by the RCPB. The reviewer identifies the predicted peak pressures and assesses the operating conditions and setpoints used in the analysis to ensure that they are suitably conservative. 5.2.2-10 Revision 3 - March 2007 vi. Relevant industry codes and classifications applied to the system analysis for power operations should be clearly identified, as specified in 10 CFR 50, Appendix G and Regulatory Issue Summary (RIS) 2004-04. Assumptions used in the analysis, including the initial plant conditions and system parameters, should also be identified and justified. The reviewer should identify studies that show the sensitivity of the system’s performance to variations in these conditions, parameters, and characteristics. The reviewer also should consult Section 5.2.2 of the FSAR for new plant designs to obtain insight on the overpressure protection methodology. B. PWRs Operating at Power i. The reviewer examines the piping and instrumentation diagrams to determine the number, type, and location of the SRVs in both the primary and secondary systems and in discharge lines, instrumentation, and other components. A large-capacity pressurizer may eliminate the need for a PORV in the PWR primary system. ii. The reviewer identifies all other functions of the components, instruments, or controls used for overpressure protection and the interfaces with all other systems. This includes any blowdown or heat