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:
and they showed no appreciable change in the tensile strength of the pipe test piece. For cooling water application,. there appears little opportu nity for radiation exposure, and the piping should be acceptable without additional testing. This guide does not address the acceptability of RTR piping for other systems. If RTR piping is considered for systems such as liquid radwaste systems where it may be exposed to long-term radiation, the laminates should be a Copies may be obtained from the Amerien Society for Testing and Materal$, 1915 Racm Street, Philadelphia, Pennsylvania 19103. tested and qualified" for the intended environ ment. Use of RTR piping for systems other than spray ponds would be considered on a case-by-case basis only. Metal pressure vessels and closed systems "are provided with pressure relief valves or devices for protection against overpressure. Where RTR piping systems are used for open ended systems such as the cooling water distri bution for spray ponds, the relief valve provi sions may be omitted. However, it is desirable to protect the integrity of the piping by other means such as selection of spray nozzles to prevent their clogging or selection of pump delivery characteristics to prevent the piping pressure from exceeding the design pressure for the piping. Industry experience with fiberglass reinforced resin pressure vestels-and piping extends over 20 to 23 years of service I experience during which the performance of fiberglass-reinforced resin piping has been satisfactory. Industry claims that the life expectancy for properly installed piping is at least 40 years, the' normal design life for presently planned- nuclear- power plants. Since RTR piping applications will be limited to temperatures less than 650 C (149 0 F). except for occasional transients to 1000C (212 0F), there is little need for applying insulation to such piping. Hence it should be left bare to make the piping readily, accessible for inspec tion. Since the NRC' staff