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:
nal 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 is allowing only 105 cycles for qualification testing of the piping, special precautions should be taken to ensure that the design assumptions are not exceeded. The preoperational testing program should include tests of the installed piping to ensure absence of vibration due to weather conditions or water flow that may fatigue the piping beyond values assumed in the design of the system. Inservice inspection requirements should be similar to those in ASME Code, Section XII for Class 3 components. 3 The inspection for Code Class 3 components involves a visual inspection of the piping for evidence of unanticipated leakage and structural distress. Since the support of RTR piping may be sensitive, each inservice inspection of such piping should include all its supports. C. REGULATORY POSITION Safety-related spray pond piping components made from fiberglass-reinforced thermosetting 3 Components classified as NRC Quality Group At B,. ard C should conform to the requirements of the ARMi Boiler and Pressure Vessel Code for Class 3 components (NBC Regulatory Guide 1.25, "Qu•lity Group Classificatio and Standards for Water-, Steam-, and Radoactive-Wuts-Containing Components ot Nuclear Power Plants-). 1.72-2 resin should comply with ASME Code Case N-155-l (1792-1) supplemented by the follow ing: 1. The design temperature for spray pond piping should be 1000 C (212 0F). 2. The allowable design stress should be the value obtained from the minimum HDB (hydro static design basis) in Table 3611-1 of Code Case N-155-1 (Procedure A or B) or the value determined as one-sixth of the stress 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)