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:
annealing operation and should include all quality assurance measures needed to ensure an effective annealing operation. The annealing procedure should identify the controls that will be in place and how these will be applied and maintained throughout the annealing operation. The annealing procedure should describe how the heat treatment equipment will be installed and removed from the vessel; what procedures will be instituted to control radioactive contamination before, during, and after the annealing operation; and how the vessel will be drained and dried prior to annealing. The proce dures should detail the precautions to be taken to pre clude cooling water leakage into the vessel during the annealing operation; such leakage could result in a steam explosion or a thermal shock to the vessel. 1.7 Proposed Annealing Equipment This section of the report should provide a de scription of the equipment to be used for the in-service annealing. It should describe the heating apparatus and the general plant layout to support the annealing operation; the controls and instrumentation, including redundant controls; and equipment for measuring and recording the temperatures and temperature profiles. This section should describe how the equipment will operate, as well as what provisions will be made to pro tect personnel from radiation exposure and to protect instruments and equipment from temperature effects during the annealing operation. The heating apparatus should be designed, pro vided with instrumentation, and controlled so that the entire section of the vessel to be annealed is effectively held at a uniform temperature, within the bounds es tablished by the Thermal Annealing Operating Plan, throughout the annealing period. Redundancy in heat ing devices, controls, and instrumentation should be discussed in the operating plan. The temperature con trol system should be able to control temperatures suf ficiently to avert adverse effects from thermal gradients during