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:
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 tank, any provision for circulating the tank coolant should be described. If the biological shield is a concrete structure, the properties of the concrete should be reported as well as the properties of other concrete structures exposed to higher than normal temperatures. The existing design temperature limita tions for the concrete should be described. If the de sign temperature limitations are to be exceeded during the thermal annealing operation, an acceptable maxi mum temperature for the concrete should be estab lished as addressed in Paragraph 1.4. The piping attached to the vessel should be de scribed. This description should include material types, dimensions, and restraints such as supports and snubbers. The design requirements with respect to temperature and bending stress or strain limitations should be identified for the piping. Further, any indi cations of potential flaws found during inspections of the piping should be described. Any other equipment or instrumentation that could be affected by the thermal annealing should be described. A description of the overall containment as it relates to core removal and storage, as well as the annealing of the vessel, should be included. Any spe cial requirements should be described in detail. For example, storage of core internals may require a coffer dam approach to isolate the coolant from the heating equipment in the drained vessel, in which case the modifications, the equipment, and the method for en suring the integrity of the isolation seals should be detailed. 1.4 Thermal and Stress Analyses This section of the report should provide an evalu ation of the effects of mechanical and thermal stresses and temperatures on the vessel, containment, biologi cal shield, attached piping and appurtenances, and ad jacent