Document: NUREG-0800
Document ID: d51db4b1-0b68-4e27-8107-a41ccdbd671a
Document Type: srp
Title: ASME CODE CLASS 1, 2, AND 3 COMPONENTS, COMPONENT SUPPORTS,
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070337.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.9.3
CFR Part: 
CFR Title: 

Content:
s and associated piping during the functioning of one or more of the relief devices. In the CP review, it is determined whetherif there is 80 reasonable assurance that the final design will meet these objectivesthis objective. At 81 the OL stage, the final design is reviewed to determine that the objectives haveobjective has been met. 82 The review is performed as follows: a. The design of the pressure retaining boundary of the device is reviewed by comparison with the Code. Since explicit rules are not yet available within the Code for the design of safety and pressure relief valves, the design is reviewed on the basis of reference to sections of the Code on vessels, piping, and line valves, and ASME Code Case N-100 (Reference 6).Appendix O, ASME Code, Section III, Division 1, "Rules for the Design of Safety Valve Installations" and the additional acceptance criteria in subsection II.2 in this SRP section.83 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 covered under the areasin the subsections entitled "Loading Combinations, System Operating 84 Transients, and Stress Limits" (subsections II.1 and III.1) in this SRP section. 85 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 DRAFT Rev. 2 - April 1996 3.9.3-14 analysis, and magnitude of a dynamic load factor (if used). In reaching an acceptance determination, the reviewer compares the submission with the requirements in subsection II.2 of this SRP section. Where deviations occur, they are identified and the justification is evaluated. Valve opening sequence effects must consider the worstinclude the worst-case load combination possible and