Document: NRC Regulatory Guide
Document ID: c94378e6-d5f2-4911-8d1d-2a16783d9866
Document Type: regulatory_guide
Title: Installation of Overpressure Protection Devices
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1306/ML13064A109.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.67
CFR Part: 
CFR Title: 

Content:
e, and systems with slug flow as from a water seal. The scope of this regulatory guide does not include such systems. C. REGULATORY POSITION For those pressure relief valve stations2 within its scope, ASME Code Case 1569, "Design of Piping for 2These requirements should also be considered for application to blowdown valves whose discharge pipe geometry kneets tile requirements of Code Case 1569. Pressure Relief Valve Station," should be used in the design and evaluation of the structural and pressure boundary integrity of piping subjected to the reaction forces associated with pressure relief valve discharges, supplemented by the following: I. The magnitude of the reaction force resulting from discharge of the pressure relief valve, the anticipated transient behavior of this force, and the basis for the determination of the specified magnitude should be set forth in the Report on Overpressure Protection or Analysis on Overpressure Protection and in the Owner's Design Specication, for cases where such reports are required by the Code.' 2. Where more than one valve is installed on the same run pipe, the sequence of valve openings to be assumed in analyzing for the stress at any piping location should be that sequence which is estimated to induce the maximum instantaneous value of stress at that location, unless another sequence is specified in the Design Specification based on justification delineated in the Report on Overpressure Protection or Analysis on Overpressure Protection. 3. Stresses should be evaluated, and applicable stress limits as cited in Code Case 1569 should be satisfied for all components of the run pipe and connecting systems and the pressure relief valve station including supports and all connecting welds between these components. 4. In meeting the requirements of paragraph C.3. above, the contribution from the reaction force and the moments resulting from that force should include the effects of the Dynamic Load Factor or should use the maximum