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:
shelf energy as defined in ASTM Standard E 185 (Ref. 14), should be reported for each heat of material. Material heats of base metal and weld metal that will be used for measuring percent recovery and for subsequent surveillance purposes, if any, should be identified. All reactor vessel dimensions should be reported, including diameter, wall thickness, cladding thickness, nozzle dimensions, flange dimensions, and transition section dimensions. The dimensions of the gaps be tween the vessel and other potentially affected compo nents such as adjacent concrete structures, internal permanent structures, and insulation should also be re ported. Attachments to the reactor that could be af fected by the annealing operation and the expected effects should be identified and described. Examples of such effects are: "* Changes in properties of the vessel insulation, "* Effects of thermal growth of the reactor on sliding support structures, "* Overheating of instrumentation and attachments. 1.3 Equipment, Components, and Structures Affected by Thermal Annealing This section of the report should provide a de scription of all equipment, structures, and components that could be affected by the annealing operation, either thermally or mechanically, and the expected effects to the level necessary to assess the effects of annealing on the equipment, structures, and compo nents. Examples of these effects include degradation of the biological shield because of loss in strength or reduction in neutron and gamma absorption capacity and the effects of vessel growth and distortions on at tached piping. All significant thermal and mechanical loadings projected for each item should be identified, 1.162-5 as well as actions proposed to avoid damage from these loadings. The biological shield should be described, includ ing its dimensions, materials, irradiation exposures, any unique features, and all cooling provisions to be used for controlling temperatures. If the biological shield is a