Document: NRC Regulatory Guide
Document ID: 3df13dae-14ee-4f25-95b4-1cedf617ae15
Document Type: regulatory_guide
Title: Regulatory Guidance on the Alternate Pressurized Thermal Shock Rule + HISTORY - HISTORY 03/2015 – DG-1299 , Proposed Revision 0
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1405/ML14056A011.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.230
CFR Part: 
CFR Title: 

Content:
� − × − × + + = 629 .0 ] 120 . 18 ) 448 .0 ( ) 1390 .1( [log tanh 5.0 ( 5.0 , , 10 Ni Cu t x t Ni Cu g e e e e ϕ ϕ      × <       × × × ≥ = sec / / 10 39 .4 for 10 39 .4 sec / / 10 39 .4 for 2 10 2595 .0 10 2 10 cm n t cm n t te ϕ ϕ ϕ ϕ ϕ ϕ The variables in these equations and their units are shown in Table 1. Table 1. Variables, Symbols, and Units used in Eqs. (5) – (7). Variable Symbol Units Transition temperature shift ΔT30 °F Neutron Fluence (E > 1 MeV) ϕt n/cm2 Effective Neutron Fluence (E > 1 MeV)* ϕte n/cm2 Neutron Flux (E > 1 MeV) ϕ n/cm2/sec Irradiation Temperature TC °F Copper content Cu weight % Effective Copper content Cue weight % Nickel content Ni weight % Manganese content Mn weight % Phosphorus content P weight % Step 1: Assess the Availability of Surveillance Data and Collect Information to Support the Statistical Analysis Paragraph (f)(6)(i) of 10 CFR 50.61a requires that the licensee assess the suitability of its surveillance data. Licensees who utilize this guidance should assess its surveillance data as follows: (a) For each shell material in the RPV beltline region, identify all surveillance data from the plant being assessed and from any other reactor that is operating, or has previously operated, under a license issued by the NRC that is of the same heat of material. (b) Count the number of values of shift produced by irradiation in the Charpy V-notch (CVN) transition temperature at the 30 ft-lb energy level, ΔT30, for each beltline material identified in Step 1(a). When counting data for individual plates and forgings, ΔT30 obtained for different notch orientations should be treated as part of the same data set. DG-1299, Page 7 i. If there are fewer than three ΔT30 values measured at three different fluence values for a material, then no surveillance tests are required for that material. The remaining steps of this procedure may be ignored and the ETC in 10 CFR 50.61a