Document: NRC Regulatory Guide
Document ID: 40fb588c-37f6-474f-b12a-d7be81beefe5
Document Type: regulatory_guide
Title: Guidelines for Evaluating Fatigue Analyses Incorporating the Life Reduction of Metal Components Due to the Effects of the Light-Water Reactor Environment for New Reactors (Rev. 1)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1417/ML14171A584.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.207
CFR Part: 
CFR Title: 

Content:
tal CUF Calculate the environmental CUF using Equation A.19 in NUREG/CR-6909, Revision 1. 2. Wrought and Cast Austenitic Stainless Steels and Welds Calculate the environmental CUF for wrought and cast austenitic stainless steel components and their associated weld metals exposed to LWR coolant environments using the procedures in Sections 2.1 through 2.3. 2.1. CUF in Air Calculate the CUF in air using ASME Code, Section III analysis procedures (Subarticle NB- 3200, “Design by Analysis,” or Subarticle NB-3600, “Piping Design”) and the stainless steel fatigue air curve (proposed design curve) provided in Figure A.3 and Table A.2 in Appendix A to NUREG/CR-6909, Revision 1. Alternatively, the fatigue design curve for austenitic stainless steel in Section III of the 2013 Edition of the ASME Code may be used. 2.2. Environmental Factor (Fen) Calculate Fen using Equation A.8 in NUREG/CR-6909, Revision 1. In the same document, Equations A.9 through A.11 should be used to calculate the parameters used in Equation A.8; Equation A.12 defines the strain threshold. 2.3. Environmental CUF Calculate the environmental CUF using Equation A.19 in NUREG/CR-6909, Revision 1. 3. Ni-Cr-Fe Alloys and Welds Calculate the environmental CUF for Ni-Cr-Fe alloy components (e.g., Alloys 600, 690, 718, and 800) and their associated weld metals exposed to LWR coolant environments using the procedures in Sections 3.1 through 3.3. 3.1. CUF in Air Calculate the CUF in air using ASME Code, Section III analysis procedures (Subarticle NB- 3200, “Design by Analysis,” or Subarticle NB-3600, “Piping Design”) and the stainless steel fatigue air curve (proposed design curve) provided in Figure A.3 and Table A.2 in Appendix A to NUREG/CR-6909, Revision 1. Alternatively, the fatigue design curve for Ni-Cr-Fe alloys in Section III of the 2013 Edition of the ASME Code may be used. 3.2. Environmental Factor (Fen) Calculate Fen using Equation A.13 in NUREG/CR-6909, Revision 1. In the same document,