Document: NRC Regulatory Guide
Document ID: c55ba6c5-aa2d-4ad6-aba2-2001e16524ab
Document Type: regulatory_guide
Title: Ultrasonic Testing of Reactor Vessel Welds During Preservice and Inservice Examinations (Rev. 1)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1221/ML12216A015.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.150
CFR Part: 
CFR Title: 

Content:
ed for indica- tions that are reportable according to this regulatory position: a. Indications should be recorded at scan intervals no greater than Ione-fourth inch. b. The recorded information should include the indication travel (metal path distance) and the transducer position for 20 percent, (where applicable), 50 percent, and 100 per- cent DAC and the maximum amplitude of the signal. c. When multi-channel equipment is used in the examination system such that all examination displays are not available for simultaneous viewing, an electronic gating system should be used which will provide on-line reproducible, recorded information, regarding metal path, amplitude and position of all indi- cations exceeding a pr.eset level. The preset level should be the mini- mum recording level required. To ensure that all recordable indications are recorded, a preferred method would incorporate multi-gates in each channel or a single gate for each channel with multi-indication recording capability. 7. REPORTING OF RESULTS Records obtained while following the recommendations of regulatory positions 1.2, 3, and 6, along with discussions and explanations, if any, should be kept available at the site. If the size of an indication, as determined in regulatory positions 6.2 or 6.3, exceeds the allowable limits of Section XI of the ASME Code, the indications should be reported as abnormal degradation of reactor pressure boundary in accordance with the recommendation of regulatory position 2.a(3) of Regulatory Guide 1.16. Along with the report of ultra- sonic examination test results, the following information should also be included: a. The best estimate of the tolerances in sizing the flaws at the sensitivity required in Section 6 and the basis for this estimate. This estimate may be determined in part by the use of additional reflectors in the basic calibration block. b. A description of the technique used to qualify the effectiveness of the examination procedure, including, as a