Document: NRC Regulatory Guide
Document ID: 55b1f520-7682-43fa-a5c3-254f661dcc82
Document Type: regulatory_guide
Title: Nondestructive Examination of Tubular Products
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1306/ML13064A108.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.66
CFR Part: 
CFR Title: 

Content:
h meet: design requirements of NB-3673, Section III, ASME cod, exempted from the examination requirements. 1.66-2 2. Ultrasonic Examination a. The procedure for ultrasonic examination should provide a sensitivity which will consistently detect defects that produce indications equal to or greater than the indications produced by standard defects in the reference specimen described in paragraph C.3. below and, insofar as practical, should be capable of detecting such defects regardless of orientation. Products with defects that produce indications in excess of the reference standards are unacceptable unless the defects are eliminated or repaired. b. The techniques employed in ultrasonic examination of pipe should include angle beam scanning in both transverse and both longitudinal directions. c. The rotation of the pipe and translation (feed helix) of the search unit assembly should be mai,,ained constant and should be such that 10MW/, volumetric coverage is assured in the longitudinal and r-knsverse directions. d. The calibration procedure for ultrasonic examinations should be conducted in both transverse and both longitudinal directions and at the speed that will be used for acceptance examination of the piping. 3. Reference Specimen In addition to the axial notches or grooves required. by NB-2552, Section III of the ASME Code, the reference specimen used for ultrasonic examination of piping should also contain transverse notches extending circumferentially on the inner and outer surfaces. The transverse notches should have the same dimensional requirements as the axial notches (e.g., length of approximately I inch or less depending on the diameter, a width not to exceed 1/16 inch, and a depth not greater than the larger of 0.004 inch or 5 percent of the nominal wall thickness). All standard notches should be separated sufficiently to preclude any interference or amplification of their respective indications. 1.66-3