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:
suitably conservative. 5.2.2-11 Revision 3 - March 2007 vii. The reviewer ensures that nonsafety-grade, pressure-operated relief valves are not credited for the mitigation of events that result in an increase in reactor coolant inventory. Furthermore, the reviewer ensures that the pressurizer does not reach a water-solid condition in response to events that lead to an increase in reactor coolant inventory per RS-001. viii. The reviewer ensures that relevant industry codes and classifications applied to the system analysis for power operations should be clearly identified as specified in 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 should consult Section 5.2.2 of the FSAR for new plant designs to obtain insight into the overpressure protection methodology. C. PWRs Operating at Low Temperature (Startup, Shutdown) i. The reviewer examines the piping and instrumentation diagrams to determine the number, type, and location of the SRVs in the primary system and of discharge lines, instrumentation, and other components in interfacing systems. ii. The reviewer examines failures of the makeup and letdown system or the RHR system to ensure overpressure protection during low-temperature operation of the plant. iii. The reviewer identifies the capacities, setpoints, and setpoint tolerances for all SRVs designated for low-temperature overpressure protection. The reviewer verifies that these constraints are adequate to provide overpressure protection to the RCPB at critical values of temperature based on RCPB material parameters. iv. Relevant industry codes and classifications applied to the system analysis for low-temperature operation should be clearly identified as specified in RIS 2004-04. Assumptions