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:
eport). For review of both DC and COL applications, SRP Section 14.3 should be followed for the review of ITAAC. The review of ITAAC cannot be completed until after the completion of this section. IV. EVALUATION FINDINGS The reviewer verifies that the applicant has provided sufficient information and that the review and calculations (if applicable) support conclusions of the following type to be included in the staff's safety evaluation report. The reviewer also states the bases for those conclusions. 5.2.2-13 Revision 3 - March 2007 1. BWRs. The overpressure protection system prevents overpressurization of the RCPB under the most severe transients and limits the reactor pressure during normal operational transients. The isolation condenser system provides overpressure protection. The SRVs located on the ____ main steamlines between the reactor vessel and the first isolation valve inside the drywell provide defense-in-depth. The SRVs are distributed among the ____ main steamlines such that a single accident cannot disable the automatic overpressure protection function. The valves discharge through piping to the suppression pool. The valves have setpoints that range from ______ to ______ kilopascal gauge (kPag) (______ to ______ pounds per square inch gauge (psig)). The total capacity at their setpoints is ______ percent of rated steam flow. To determine the ability of the overpressure protection system to prevent overpressurization, the applicant has analyzed the most severe anticipated overpressure transients. The analysis assumed that (1) the plant is in operation at design conditions of ____ percent of rated steam flow and a reactor vessel dome pressure of ____ kPag (__ psig) and (2) the reactor is shut down by ______. The calculated peak pressure at the bottom of the vessel is ______ kPag (______ psig), a value within the code allowable of ______ kPag (______ psig) (110 percent of vessel design pressure). 2. PWRs. The overpressure protection system prevents