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:
g fracture toughness recovery and establishing reembrittlement rates. This regulatory guide applies to thermal annealing procedures that use heaters (electric or gas) for heating the reactor vessel, ) the "dry" anneal method. Use of the "wet" anneal method, which applies heat generated by the pump to heat the reactor coolant, will be reviewed separately, on a case-by-case basis. 1. THERMAL ANNEALING OPERATING PLAN The Thermal Annealing Operating Plan should in clude sufficient information to permit an independent evaluation of all the elements that went into its devel opment. The following sections provide guidance on the format and content acceptable to the NRC staff for the operating plan, the information that should be in cluded in the plan, the minimum level of detail for this information, and the necessary supporting data. In all cases, the information described in this guide may be referenced if it has been submitted previously in another document, including any updates to pre vious submittals. 1.1 General Considerations This first section should present introductory and general information. It should identify the reactor and give the reasons that thermal annealing is being pro j posed, including any regulatory requirement being challenged by the loss in fracture toughness. The pro jected percent recovery from annealing and the pro jected rate of reembrittlement in subsequent reactor operations should be identified, as well as the expected remaining operating life after annealing. The projected annealing response and reirradiation response should be determined using the provisions of this guide in Sec tion 3, "Fracture Toughness Recovery and Reem brittlement Assurance Program." In using these provi sions, the projected recovery should be determined using the annealing time and temperature proposed in the application. The operating history of the reactor prior to an nealing should be described in this section, including the power-time-temperature history during