Document: NUREG-0800
Document ID: ab446416-2fc8-4284-a6e7-dee74ec59afd
Document Type: srp
Title: -13
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1233/ML12334A360.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.9.3
CFR Part: 
CFR Title: 

Content:
Draft Revision 3 – June 2013 Category I components. If the OBE is defined as one-third or less of the SSE, explicit response or design analyses are not required. 2. Design and Installation of Pressure Relief Devices. The objective of the review of the design and installation of pressure relief devices is to ensure the integrity of the pressure relieving devices and associated piping during the functioning of one or more of the relief devices. For a CP review, it is determined if there is reasonable assurance that the final design will meet this objective. At the OL stage, the final design is reviewed to determine that the objective has been met. The review is performed as follows: A. The design of the pressure retaining boundary of the device is reviewed by comparison with Appendix O of the Code, “Rules for the Design of Safety Valve Installations” and the additional acceptance criteria in Subsection II.2 in this SRP section. Allowable stress limits are compared with those in the Code for the appropriate class of construction. Deviations are identified and the applicant is requested to provide justification. Stress limits and loading combinations are in the subsections entitled “Loading Combinations, System Operating Transients, and Stress Limits” (Subsections II.1 and III.1) in this SRP section. B. The design of the installation is reviewed for structural adequacy to withstand the dynamic effects of relief valve operation. The applicant should include and discuss: reaction force, valve opening sequence, valve opening time, method of analysis, and magnitude of a dynamic load factor (if used). In reaching an acceptance determination, the reviewer compares the submission with the criteria in Subsection II.2 of this SRP section. Where deviations occur, they are identified and the justification is evaluated. Valve opening sequence effects should include the worst-case load combination and forcing functions should be justified with valve opening time data. The