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:
he actual time-temperature parameters of the vessel annealing operation should be used and re ported. If the percent recovery is determined from testing credible surveillance specimens or from testing materials removed from the beltline region of the reac tor vessel, and the testing was subsequent to the an nealing operation or was not reported in the Thermal Annealing Operating Plan, the results of these tests should be reported. In this case, the report should include the initial unirradiated properties, the as irradiated properties just prior to annealing, and the properties of the test specimens in the irradiated and annealed conditions. The report should provide sup porting evidence for the licensee's report that the an nealing conditions for the test specimens were equal to or bounded by the annealing conditions of the reactor vessel. If the percent recovery is determined by calcu lation, the evaluation of percent recovery should use the actual vessel lower-bound annealing time and tem perature. In all cases, the report should include the post-anneal RTNDT and Charpy upper-shelf energy values. 6.4 Determination of Reembrittlement Trend The program for determining the reembrittlement trend based on both the reference temperature and the Charpy upper-shelf energy should be described, in cluding the results of any analyses or tests that establish these reembrittlement trends. The program should specifically identify the post-anneal "starting" values of reference temperature and Charpy upper-shelf energy, as well as the projected embrittlement path of these values with increasing neutron fluence, including the basis for this projection. To the degree that this in formation is the same as the information in the Ther mal Annealing Operation Plan, the plan may be referenced. 6.5 Changes to Surveillance Program Changes to the surveillance program previously described in the Thermal Annealing Report (10 CFR 50.66(b) (3) (ii) (B)) that are the result of the annealing