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:
interpola tion between Equation 2 evaluated at 775 °F with the flux term and Equation 2 evaluated at 8000 without the flux term should be made. Since plant operational characteristics do not re sult in a unique value of irradiation temperature throughout a plant's lifetime, the method used for evaluating Ti should be described in the assurance program. Equations 1 and 2 are documented in Reference 8 and represent mean values of the percent recovery of RTNDT and USE. 3.1.4 Specimen Handling and Preparation Procedures 3.1.4.1 Specimen Handling Procedures. For re constituting surveillance specimens or removing sam ples from the vessel beltine, the assurance program should describe the methods to be used for marking and handling the test materials to ensure that the orientation of the material relative to the vessel is un ambiguous and traceable. 3.1.4.2 Specimen Orientation. The assurance program should address the orientation of the speci mens to be tested. For testing materials from a "cred ible" surveillance program for the evaluation of per cent recovery of ARTNDT, it is preferable to test the post-anneal specimens in the same orientation as the original surveillance tests. In contrast, for evaluation of Charpy upper-shelf energy, it may be preferable to use specimens oriented in the transverse direction, the T-L orientation, according to ASTM Standard E 399 (Ref. 18). 3.1.4.3 Reconstitution of Charpy Specimens. Reconstitution of Charpy specimens is used to provide new full-size Charpy specimens from the broken pieces of previously tested specimens and to conserve materi al. Several methods are available for welding end-tabs onto the test material section, with the goal of each method to provide a structurally sound and testable specimen (i.e., the specimen does not fracture at the reconstitution welds) without overheating (possibly in ducing annealing) the test section. The assurance program should describe the proce dures to be used for the reconstitution