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:
ble for welds ýsuch as those identified in Section T-441.4.2 of Article 4, Section V of the ASME Code, at least one angle should be such that the beam is per- 1.150-13 pendicular (+ 15 degrees to the perpendicular) to the weld/parent metal interface, or it should be demonstrated that unfavorably oriented planar flaws can be detected by the UT technique being used. If this is not feasible, use of alternative volumetric NDE tech- niques, as permitted by the ASME Code, should be considered. 4. BEAM PROFILE (Delete entire paragraph. This section included in Recommended Change 1.2.f., Angle Beam Profile Characterization.) 5. SCANNING WELD-METAL INTERFACE (Delete entire paragraph. This section included in Recommended Change 3.2, Scanning Weld-Metal Interface.) 6. RECORDING AND SIZING The capability to detect, record and size the flaws delineated by Section XI, IWB-3500 should be demonstrated. The measurement tolerance established should be applied when sizing flaws detected and recorded during scanning (see paragraph 7.a.). 6.1 Geometric Indications Indications determined to be from geometric sources need not be sized. Recording of these indica- tions should be at 50 percent DAC. When indications are evaluated as geometric in origin, the basis for that determination should be described. After recording sufficient information to identify the origin of the geometric indication, further recording and evaluation are not required. 6.2 Indications with Changing Metal Path a. Indications that change metal E path distances (indicating through- wall dimension) when scanned in accordance with the requirements of ASME Section XI, for a distance greater than that recorded from the calibration reflector should be recorded. b. Reflectors which are at metal paths representing 25 percent and greater of the through-wall thickness of the vessel wall measured from the inner surface should be recorded in accordance with the requirements of ASME Section XI and characterized at 50 percent