Document: NRC Regulatory Guide
Document ID: 4056a39f-0c52-46d1-b8d4-097c0827389f
Document Type: regulatory_guide
Title: Spray Pond Piping Made from Fiberglass-Reinforced Thermosetting Resin (Rev. 2)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML0037/ML003740253.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.72
CFR Part: 
CFR Title: 

Content:
obtained from a short-time burst test for the pipe being qualified, whichever is lower. The short-time burst strength should be determined by bursting the pipe (ASTM D-1599-74 using free end mounting) after it has been exposed to 105 pressure cycles from atmospheric to design pressure. 3. The value of "K" in equation 9 of para graph 3652.2 should be limited to 1.2 unless it can be demonstrated that with the use of a large value of K the functional capability of the system will not be impaired during upset and emergency conditions. 4. The following items should be identified: a. The physical location of the system in relation to other safety-related systems, b. The design and service loads, and c. The value of "B" to be used in equa tion 1 of paragraph 3641.1, together with justification for its selection. 5. Pressure-relief devices may be omitted for piping systems that are open-ended and for which the system pressure is limited by other means (such as nonclogging spray nozzles and self-limiting pump characteristics) to design pressure. 6. RTR piping should be uninsulated or uncovered and installed under conditions that make it readily accessible for inspection. 7. Preoperational and inservice inspections should be as follows: a. During the preoperational testing peri od, tests should be made to verify that the piping is free of vibration induced by weather conditions or water flow that could fatigue the piping prematurely. b. Fiberglass-reinforced piping components should be inspected in accordance with ASME Code, Section XI, for Code Class 3 compo nents .3 In addition, all pipe supports should be inspected. c. Inspection frequency for piping should be increased to once annually if an exterior weather-resistant coating is not provided. D. IMPLEMENTATION The purpose of this section is to provide information to license applicants and licensees regarding the NRC staff's plans for using this regulatory guide. This guide reflects current NRC staff prac tice. Therefore,