Document: NRC Regulatory Guide
Document ID: 2704425a-c58a-45c4-93ab-8761721c3e7a
Document Type: regulatory_guide
Title: Evaluation of Reactor Pressure Vessels with Charpy Upper-Shelf Energy Less Than 50 Ft-Lb
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML0037/ML003740038.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.161
CFR Part: 
CFR Title: 

Content:
) DATA XI/O., .0125, .025, .0375, .05, .075,.l,.15,.2,.3,.4,5I DATA Y/.05, .25, .5, .8 / DATA YM/ 1.0,.99,.98,.96,.95,.91,.87,.80,.75,.66,.60,.55, 1 1.0,.94,.88,.83,.80,.76,.73,.68,.63,.55,49,.44, 2 1 .0,.88,.77,.69,.64,.59,.55,.49,.44,36,31,.27, 3 1.0,.72,.56,.48,.43,.38,.35,.29,.24,. 18,.15,.131 DATA YB/ i.0,98,97,.95,.94,.92,.89,85,.82,74,.66,.58, 2 1., .93,.88,.84,.80,.75,.72,.67,.63,.57,.50,.43, 2 1., .84,.71 ,.63,.57,.49,.45,.39,.35,.29,.23,.18, 3 1., .69,.50,.38,.29,.20,.14,.08,.05,.02,-.01,-.041 DATA Z/ 0.0, 0.5 / DATA ZM/.44,.55, .40,.48,.31,.31,.23,.17 I DATA ZB/.50, .62, .63, .67, .58, .50, .43,.32 I AOL = AAAI(2.0*BBB) AOT = AAAfTHH DO 100- I=1,3 J=I IF(Y(I+1).GT.AOT) GO TO 110 100 CONTINUE liONI =J N2 =J+l DO 1201= 1, 11 J=I IF(XI(I+1).GT.AOL) GOTO 130 120 CONTINUE 130 MI =J M2 = J+l FACI = (AOL-XI(M1))/(Xl(M2)-XI(M1)) XXI = YM(MI ,N1)+FAC I *(YM(M2,NI)-YM(MI,N1)) B-10 MU =YM(MIN2)+FACI*(YM(M2,N2)-YM(MI.N2)) FAC =(AOT-Y(NI)Y(Y(N2)-Y(Nl)) IF (AOT IT. 0.05 ) FAC 0.0 F (AOT.GT. 0.80) FAC 1.0 FMA = XXI + FAC*(XX2 - XXI XXI = YB(MINl) + FACI*(YB(tMNl)-YB(MINl)) xm -YB(miN2)+FACI*(YB(tMN2)-YB(MI.N2)) IFBA - XXI + FAC*(XM -XXI FAC I = AOL/0-5 XXI -ZKI.Nl)+FACI*(U4C2,Nl)-ZM(INl)) )m =zm(iN2)+FACI*(ZM(2,N2)-ZM(l.N2)) FMB = XXI + FAC*(3M-XXI) XXI - ZB(INl) + FACI*(ZB(2,Nl)- ZB(INl)) XM = ZB(IN2) +FACI*(ZB<2.N2)- ZB(I.N2)) FBB - XXI + FAC*(XM -XXI) RETURN END B-11 REGULATORY ANALYSIS 1. STATEMENT OF THE PROBLEM Appendix 0, 'Fracur Toughness Requircmencs,' to 10 CFR Part 50, 'Domestic Licensing of Production and Utilization Facilities,' requires, in part, that the reactor vessel bcltline materials '... must have Charpy upper-shelf energy of no less than 75 ft-lb (102J) initia"ly and must maintain uppcer-shelf energy throughout the life of the vessel of no less than 50 ft-lb (68J). unless it is demonstrated in a manner approved by the Director, Office of Nuclear Reactor Regulation, that lower values of upper-shcfenergy will provide margins of safety against fracture