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:
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 function of the population size N and the test sample size n1. When the failure rate for this check exceeds the limitations corresponding to 95-percent confidence of no more than 5 percent nonconforming bolts, the installation procedure should be considered to be unacceptable. 1 This sampling program adopts the essential features of the sampling program in NRC IE Bulletin 79-02, “Pipe Support Base Plate Designs Using Concrete Expansion Bolts,” Revision 2, dated November 8, 1979 (Ref. A.1), which was adapted from Electric Power Research Institute (EPRI)-NP-5228, “Seismic Verification of Nuclear Power Plant Equipment Anchorage,” issued May 1987 (Ref. A.2). Appendix A to DG-1284, Page A-2 Table A-1. Allowable Number of Nonconforming Anchors (R × n) Total Population Size (N) Test Sample Size (n) 40 60 80 100 150 200 250 300 350 400 450 500 100 1 2 3 5 200 1 1 2 3 6 10 300 1 1 2 3 5 7 10 15 400 1 1 2 3 5 7 9 12 15 20 500 1 1 2 3 5 7 9 12 14 17 20 25 600 1 1 2 3 5 7 9 11 14 16 19 22 700 1 1 2 3 4 7 9 11 13 16 18 21 800 1 1 2 3 4 6 9 11 13 16 18 21 900 1 1 2 3 4 6 8 11 13 15 18 20 1000 1 1 2 3 4 6 8 11 13 15 17 20 REFERENCES A.1 NRC IE Bulletin 79-02, “Pipe Support Base Plate Designs Using Concrete Expansion Bolts,” Revision 2, Washington, DC, November 8, 1979. (ADAMS Accession No. ML080310536) A.2 Electric Power Research Institute NP-5228, “Seismic Verification of Nuclear Plant Equipment Anchorage,” Volumes 1 and 2, Palo Alto, California, May 1987.6 6 Copies of Electric Power Research Institute (EPRI) documents may be obtained by contacting the Electric Power Research Institute, 3420 Hillview Avenue, Palo Alto, CA 94304, telephone: (650) 855-2000 or through the EPRI Web site at http://my.epri.com/portal/server.pt.