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 1/4T or weld bulk properties as called for by Regulatory Guide 1.99, Revision 2 (Ref. 21). However, evaluations of the pre anneal and the post-anneal properties of the sample removed from the vessel beltline will provide sufficient data to evaluate the expected recovery at the plate or forging II4T level or the weld bulk properties. The assurance program should describe the proce dures used to evaluate percent recovery for the vessel materials from the measurements resulting from this method. 1.162-12 K K If the samples removed from the vessel beltline are from the peak flux location for the material, one pro cedure to evaluate the post-anneal properties from the measured percent recovery uses the following equations: RTNDT(A) = RTNDT(U) + ARTNDT x [1 - (iTs 1 TTSA) (RS / ATs)] (Equation 5) CvUSE(A) = CvUSE u (1 - D / 100) (CvSA /CVS) (Equation 6) where RTNDT(A) = reference temperature, RTNDT, of the material in the post-anneal condition in *F, RTNDT(U) = reference temperature, RTNDT, of the material in the preservice or unirradiated condition in *F, ARTNDT = mean value of the transition temperature shift, or change in RTNDT, caused by irradiation (before annealing) in -F, "iTs1 = from the measured surface data, the transition tempera ture at the 30 ft-lb energy level for the pre-anneal condition in *F, "7SA = from the measured surface data, the transition tempera ture at the 30 ft-lb energy level for the post-anneal condition in *F, RS= the ratio of Rt from Equation 2 for the 1/4T location to Rt from Equation 2 for the surface of the plate, forging or weld, ATs = the mean value of the transi tion temperature shift (in *F) at the surface of the plate, forging or weld, determined using the surface fluence and the same calculational method used to evaluate ARTNDT for the 1/4T location, CvUSE(A) = Charpy upper-shelf energy of the material in the post-anneal condition, for the 1/4T location of plate and forging, or the weld bulk properties in ft-lb, CvUSE(u) = Charpy