Document: NRC Regulatory Guide
Document ID: a2b67b51-f5fe-4c86-a879-f0e439601f7f
Document Type: regulatory_guide
Title: Format and Content of Report for Thermal Annealing of Reactor Pressure Vessels
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML0037/ML003740052.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.162
CFR Part: 
CFR Title: 

Content:
that the condition of the remaining material is bounded by the assumptions in the analysis and is acceptable. Any proposed re pairs, including weld repair, should be described in the Thermal Annealing Operating Plan. 3.1.2.2 Testing of Material Removed from the Vessel Beltline. One impediment to the quantitative use of data from testing of material removed from the vessel beltine in determining the percent recovery of ARTNDT and Charpy upper-shelf energy is that this material represents surface or near-surface properties of the material. In contrast, ASTM Standard E 185 (Ref. 14) requires the use of material from the 1/4T location of plate and forging products, and more than 0.5 in. from the surface of weld metals, to determine ARTNDT and Charpy upper-shelf energy. To permit a quantitative use of material removed from the vessel beltiine to determine the percent re covery of ARTNDT and Charpy upper-shelf energy, samples removed from the vessel beltline should be used to evaluate both the pre-anneal and the post anneal properties of the near-surface material. Speci mens used to evaluate the post-anneal properties should be annealed at time and temperature condi tions that equal or are bounded by the actual vessel annealing conditions. The resulting percent recovery of transition temperature at the 30 ft-lb level may be used to determine the percent recovery for ARTNDT, R1. The resulting percent recovery of the Charpy upper-shelf energy may be used to determine the Char py upper-shelf energy, RUSE. Samples removed from the vessel beltiine material can be used to develop test specimens in several man ners. The samples can be used to fabricate fullsize Charpy specimens, inserts for reconstitution into full size Charpy specimens, sub-size Charpy specimens or other test specimens of the approved plan. Preparation and use of these various specimen types is described in Section 3.14. 3.1.3 Computational Method The computational method uses generic equations (Equations I and