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:
-anneal period of operation. The anneal ing parameters should be compatible with design stress limits of the reactor and any other component or 1.162-6 K K structure expected to experience significant tempera ture or stress gradients during the annealing operation. Limitations such as the physical constraints resulting from attached piping, supports, snubbers, and other components and the thermal and mechanical stresses generated in the vessel and piping during the annealing operation should also be considered. This section should identify the proposed anneal ing temperature, time at temperature, heatup rate, cooldown rate, and the limitations and permitted vari ations in these conditions. The limitation on tempera ture variations should include axial, azimuthal, and through-wall gradients and the permissible tempera ture profiles in the vessel during heatup, cooldown, and steady-state heating. The bases used to establish these annealing parameters should be described. The time and temperature parameters identified in the Thermal Annealing Operating Plan should be based on the thermal and stress analyses described in Section 1.4 and should represent the bounding times, temperatures, and heatup and cooldown schedules for the thermal annealing operation that should not be vio lated during the annealing operation. If these bound ing conditions for times and temperatures are violated during the thermal annealing operation, the analysis will no longer be valid and the annealing operation is considered not in accordance with the Thermal An nealing Operating Plan. In that case, the licensee should follow Section 5.2 of this regulatory guide. 1.6 Description of Annealing Method, Instrumentation, and Procedures This section of the report should describe in detail the method selected for annealing the vessel as well as the proposed instrumentation and procedures to be applied during the annealing operation. The annealing operation should not degrade the reactor or other