Document: NUREG-0800
Document ID: fb538e14-08a0-4d3f-a974-8170cbfe0b5b
Document Type: srp
Title: ASME CODE CLASS 1, 2, AND 3 COMPONENTS,
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052340603.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.9.3
CFR Part: 
CFR Title: 

Content:
rformed 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). 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 areas entitled "Loading Combinations, System Operating Transients, and Stress Limits" in this SRP section. 3.9.3-8 Rev. 1 - July 1981 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 requirements in subsec- tion II.2 of this SRP section. Where deviations occur, they are identified and the justification is evaluated. Valve opening sequence effects must consider the worst combination possible and forcing functions must be justified with valve opening time data. The review is based in part on comparisons with prior acceptable designs tested in operating plants. 3. Component Supports The objective in the review of component supports is to determine that adequate attention has been given the various aspects of design and analysis, so that there is assurance as to structural integrity of supports and as to operability of active components that interact with component supports. The reviewer should be assured that the applicant's PSAR contains discussions and commitments to develop and utilize a snubber operability