Document: NRC Regulatory Guide
Document ID: fcaa3426-5268-4adb-a83c-69e7f50d6d6b
Document Type: regulatory_guide
Title: Anchoring Components and Structural Supports in Concrete (Rev. 1)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1725/ML17258A579.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.199
CFR Part: 
CFR Title: 

Content:
om (PDR) at 11555 Rockville Pike, Rockville, MD. For problems with ADAMS, contact the PDR staff at (301) 415-4737 or (800) 397-4209; fax (301) 415-3548; or e-mail pdr.resource@nrc.gov. 4 Copies of ACI publications may be purchased from ACI, 38800 Country Club Dr., Farmington Hills, MI 48331-3439, telephone (248) 848-3700. Purchase information is available through the ACI Web site at https://www.concrete.org. 5 Copies of ASTM publications may be purchased from ASTM, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959; telephone (877) 909-2786. Purchase information is available through the ASTM Web site at http://www.astm.org/. DG-1284, Page 2 12. NRC, Management Directive 8.4, “Management of Facility-Specific Backfitting and Information Collection,” Washington, DC. 13. NRC, NUREG-1409, “Backfitting Guidelines,” Washington, DC. Appendix A to DG-1284, Page A-1 APPENDIX A Sampling Program for Anchor Bolts Perform inspection step 2.1 in Regulatory Position 2 on at least 25 percent of the bolts in every equipment anchorage. If the selected bolts do not pass the inspection, perform step 2.1 on all bolts in the anchorage. OR Perform inspection step 2.1 on a randomly selected statistical sample of bolts. The size of the sample and the number of nonconformances should be such that there is a 95-percent confidence of no more than 5 percent nonconforming bolts. This can be determined as follows: 𝑅𝑅′ = 𝑅𝑅+ 𝑍𝑍ቆ𝑅𝑅(1 −𝑅𝑅) 𝑛𝑛 ቇ 1 2 ⁄ ൬𝑁𝑁−𝑛𝑛 𝑁𝑁−1൰ 1 2 ⁄ Where: 𝑅𝑅′ = Upper limit of the true defect rate at a specified confidence level (𝑅𝑅′ = 0.05 in this application) R = Defect rate observed in sample Z = Confidence coefficient for a normally distributed statistical model of test data (For a 95% confidence level, Z= 1.65) n = Test sample size N = Total population from which test sample was selected. Table A-1 gives the allowable number of nonconforming bolts as a