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:
icensees can assess their plant-specific material surveillance data using the three statistical tests required by Paragraph (f)(6) of 10 CFR 50.61a. If the criteria for all three statistical tests are satisfied for all beltline materials, then the RTMAX-X screening criteria in Table 1 of 10 CFR 50.61a can be used without modification. Conversely, if any of the criteria from the three statistical tests required by 10 CFR 50.61a are not satisfied for any beltline material, then additional action is required to justify the use of the RTMAX-X screening criteria in Table 1 of 10 CFR 50.61a as required by Paragraph (f)(6)(vi) of 10 CFR 50.61a. To use this procedure the following equations are needed. Equation numbers identical to those in Paragraph (g) of 10 CFR 50.61a are used for consistency. Equation (5) is the embrittlement trend curve (ETC). CRP MD T + = Δ 30 (5) 5.0 471 .2 ) 13 .6 1( ) 0.001718 - 1( e C t Mn P T A MD ϕ × × × + × × × = (6) where:      = − − − for welds 10 x 417 .1 plates for 10 x 561 .1 forgings for 10 x 140 .1 7 7 7 A ( ) ( ) ( ) e e e t Ni Cu g P Cu f Ni B CRP ϕ , , , 77 .3 1 191 .1 × × × + × = (7) where:       = welds for . vessels ed manufactur g Engineerin Combustion in plates for . vessels ed manufactur g Engineerin Combustion - non in plates for . forgings for . B 0 155 2 135 5 102 3 102    > ≤ = wt% 072 .0 for )] ( , [ wt% 072 .0 for 0 Cu Cu MAX Cu MIN Cu Cu e e    = materials other all for 301 .0 80 243 .0 ) ( welds Linde for Cu MAX e DG-1299, Page 6 ( ) [ ] [ ]      > > × + − ≤ > − ≤ = 008 .0 072 .0 for 0.008) - ( 359 .1 072 .0 008 .0 072 .0 for 072 .0 072 .0 for 0 , 0.668 0.668 P and Cu P Cu P and Cu Cu Cu P Cu f e e e ( ) ( )   − × − × + + = 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 / /