ML20078R736

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Plain Carbon Steel
ML20078R736
Person / Time
Site: 05000605
Issue date: 09/07/1981
From: Garber N
GENERAL ELECTRIC CO.
To:
References
408HA414, 408HA414-R01, 408HA414-R1, NUDOCS 9412270184
Download: ML20078R736 (17)
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DEC 14 '94 06:13pM GE NUCLO:R BLDG J P.E eenA414 se 2 SENERAL $ ELECTRIC 1 N_UCd.fAM.EN_aRFi 11. ints documant describes the allowable grades and supplementary requirements SCOPE These carbon of plav carbon steel components to be used in tlWR systees. 1.1 steel grades are intended for use within the GE scope of supply as well as the balance of plant and, as a minimum, are to be used in all ASME Section III Class 1 and Class 2 piping systems and components. Code specifications and their paragraphs referenced in this document are from 1977 ASME Cooe. to The document also considers the application of corrosion allowance: 1.2 carbon steels. This document presents a set of fatigue design rule criteria for use in mitigating potential corrosion fatigue crack initiation of carbonThese rules are to 1.3 steel within BWR coolant enyfronntents. carbon steel piping and safe end design for components within the GEIII, Class 1 and scope of supply and are to be used for all ASME SectiotClass 2 conducted. 2. GE-NPSED FOSITION Carbon steel is used extensively for piping and other componen 2.1 inp.ction cooling piping, and various drain and vent lines; t BWR systems. The emergency heat removal pipf'ig, and for various heat exchanger shells. progressively increased usage of carbon steels in moving from BWR-2 te BWR-6 demands that high quality matertel, consistent with design require-ments and costs, be impimented. The NPSED position on carbon steel usage is that intrins 7.2 Class 2 piping systems with the exception of any and all components not wetted by coolant. (See DRF 688-0020.) As an example, SA'06 - Grade 8 which must piping is not to be used. Instead, SA333 - Grade 6 piping,0 achieve 13 ft-lbs of Charpy impact energy absorption at 50 F (per ASHEIn additio material specification), is to be substituted. piping cust tre ordered to supplementary MPSED notorial specifications, The acceptable grades for each carbon steel in this case, 850YP157. form are detailed within subsequent sections of this document. Throughout this document, it is explicitly understood that ASME Coos requirements for post weld heat treatment examptions and 2.2.1 Charpy impact testing exemptions still apply. t Extensive experimental and analytical studies on environmental / mechanical interactions of carbon steel in RWR environments indicates ] 2.3 Fatigue crack initiation that total imunity does not exist. accelerated by BWR aqueous environments-is possitrie; wttigation of si.in ' ~' m9n e On

DEC 14 '94 06814PM GE m g 9,pg y P.4/17 <-, g m.. - . * -. "...;- ".m ....-r't.W r..c.. 4 i, y... m f. M..,1., s..;"'-- 6 ;' @. h, ; *..,,0.'c f S,..'.* 8.4 ~5 ~b .w 4 Wv. Y. a. ' 3.,i.. c..:. ".. v ', ' c, ~.T.-Y T .,., 7. m'.;,b. # 3 .n. e. .......a., s:.:.. , !. h..,. *.Ne. p.;... 3 .a ~

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'- * ' ~. .. - ~ ' * ~. 6 '.:.s. '; M. ~.l.7 ':' & ;.5 M e % % + b, ? s ,. l. ......I -...': :\\. f..L. yR. . ibility.is besti resolved,. by 'esinteniace. of sofficient / design .rl.thidw. W.:The. stress rules:irf teria.herein.:which 'are' used in c'onjunctio'n s real A$NC Code:fettgue;desfonTastnods! are'useif.~to providt.' " angi 'hsshan,cel that~a'dqu' ate destyn abgftvexist).for ' specific components .sith, ~ l 3. PIP. IN. G. 3,1 Seamless pipe' .5eamless' plats:cerben steel. pipe -shall.'bir.: ? : .i SA333-6 ordered to GE. .i r specf.ficetfon 350VP157.* Ilherever pos.$1bles. seamless pfpe is,to 1.1.1 be usedjfnstia(of welded l. pipe;J The.lalter.can'be used where necessit'ated by higher code allowabTe design. stresses.or by non-4 availability of large disketer (greater than'22") seamless pipe i (see Paragraph 3.2). The,850YP157 specification for seamless. P pe supplements tAe SA333 specification.as.follows: J 4 [ The steel shall be produced by a fine grain malting practice and 3.1. 2 shall be silicon plus aluminum killed. Chemical composition shall conform to SA333-6 except for the 3.1. 3 i following: Phosphorus '$' !.0;037.it/o: max. V 0".'030.Wo ', max. l Sulfur j I 3.1.4 Impurity level ' targets are sumarized below, and analytical resuits ? for each of these alenents shall be reported for information only: .l .'l Tin 0.02 max., Aluminum 0.04 max. Vanadium 0.01 max. Arsenic 0.03 max.. l Chromium 0.25 max. Antimony 0.007 max. ~ 7 Cobalt 0.005 max. Copper 0.30 max. Aluminum is used. in the deoxidation process (with silicon)',.but l Vannitum excessive aluminum will produce a " dirty" microstructure. i and chrosium are controlled for similar reasons. Arsenic.and 1 antimony in excessive quantities can promote ductility Toss, and cobalt is limited because of subsequent deposition and radioactlitity. { \\ 1 i The SA333-6 piping shall be heat treated in accordar.ce with SA333 6' Paragraphs 5.4.1~.1 or 5.4.1.2 only nomalized or neraalized and 3.1.5 i tempered'. l shed SA333-6;. pips shall ha.yt an avenge 1 3.1.6. ' he microstrdeture of fi T .No."S or finer,with.no grains coarser ' ferrite grain size of ASthan ASTM Mo. 3. as measured in.accordance

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7.;? k. 9ENER AL $ ELECTRIC 408HA414 pom. 4 ' 9 eROY nav 1 M ausmassenour ........ ~ - 3 l 3,2 pelded Pipe _ 4, Welded plain carbon steel pipe shall be SA155 - Grade KCF70 ordered +!

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3.2.1 Use of this material instead of to GE specification B50YR160. p SA333-6 should be Ifmited to piping applications requiring the s j higher design allowable htress for SA155-XCF70 or where the diameter l is so large (greater than 22 inch) that seamless SA333-6 cannot 3 Th'e GE specification for welded pipe l supplements the SA155 specification as follows: j I be readily obtained. o The impact properties of the finished pipe and weld r:etal shall a$ i l 3.2.2 seet the required impact properties of SA333 - Grade 6 piping; W 1.e.,13 ft-1bs min. at : 500F. i H l The microstructure of finisnsd SA155-KCF70 pipe shall have an average ferrite grain size of ASTM No. 8 or finer with no grains 3.2.3 j coarser than ASTM No. 5, as measured in accordance with ) i ASTM E-112. ( All plats from which welded pipe is made shall be heat treated J. - in accordance with SA516', Paragraphs 5.2 and 5.3, normalized. 9 3.2.4 The welded pipe shall bejnormalized and stress relieved in .f accordance with specification SA155 Paragraphs 4.6.4 and 4.6.5. t M Melting practice (deoxidhtfon), chemistry control, and impurity 2

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Paragraphs 3.1.2, 3.1.3.i and 3.1.4 'above, ~. ( y The NPSED position discourages the use of SA106 - Grade.B. SA53 - Grade 8, s In no l '3,3 or A120 piping in any pressure retaining application in the SWR r) applications in either the General Electric or Architect-Engineer d scope of. supply. h i 4* .P,LAT,E,

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'Piain. carbon steel plate shall be SAS16 ordered to GE specification ] BSOYP15..Y This specification for plate suppTements 'the SA516' c! 4.1 6 1 specification as follows: ,R By %.s d cted ant.the' impact properties must. 4 r b ..' meet,;thgrejQhytts/sust-e. con udMrit0 oC.SA333 /Grada. 6h 1'.e.,13.ft-Chary,ingett 4.2: i W.* % Q. ;ggMY'.l. " '. ' '.'i:khisses3fejute" shill.he; heat.treate'd in accord 3 MSA516 afspWphi. 5.2 ap 5(3 Wormalized' j' .4'.3.IA11st diioMhtion'.p'r'attipekchemfcat com' position:controlo impurity "i f ..l . AD ! h!.E M.... .s '}. % 42 M)ieiiictii soffer'riSgra.in size}equirements ere'identicat toJSA33$5 i M S .."4 '. f'.

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DEC 14 '94 06:15PM GE f0 CLEAR BLDG J P.6/17 q i mucusadmisnay GENEKA1M.EI.ECTRIC 408HA414 =5 nev 1, o puemeereneur ' l l' I "~'~EEeYshi'SA515 or 5A285 pla$ is discouraged and in no case are these l grades to be used in any A$ME.C$ ass 1 or Class 2 application. I ! S, FORGINGS Pf afn carbon' steel forginhs sha i be SA350 - Grade LF2 ordered to GE specification 55,0YP159. nis s)ecification supplements the SA350 5.1 specification as follows: The forgings shall be heat trea'ted by reors211 ring or normalizing and 5.2 tempering, j I Impact properties shall meat the requirements of 5A350 - Grade LF2, 5.3 Tables !!! and ZY. l The microstructure of the finished forging shall have an average ferrite grain size of ASTN Mo. 8 or finer with no grains coarser than ASTM No. 5. 5.4 j as measured in accordance with $5TH E-112. Melting practice (deoxidation) ; chemistry control, and isfurity target limits are identical for SA333-6 and Paragraphs 3.1.2, 3. 3, and 5.5 I 3.1.4 above. The use of $A105' forgings is discouraged and in no case is this material 5.6 to be used in any ASME Class 1 or Class 2 application. f l 5.7 The use of SA508 - Class' 1 forgings is acceptabis, 6. CASTINGS Plain carbon steel castings shall be SA352 - Grade LC8 ordered to GC specification' 050YP158. This specification supplements the 5A352 6.1 specification as follows: l The chemical composition and impurity target limits are identical to 6.2 that for SA333-6 and Paragraphs. 3.1.3 and 3.1.4 above. The use of SA216 castings is discouraged and in no case is this material ,l to be used in any ASNE Class 1 or Class 2 application. 6.3 1 i 7. FITTINGS Plain carbon steel fittings shall be SA420 - Grade WPL6, ordered to GE l The SA420 WPL6 specification calls out a 7.1 speciffr.ation 650YP155.consistant set of tough grade components, specifically 5A333-6 Pipe SA350-LF2 Forgings 2 SA516-70 Plath j i Tubd r SA334-6 t l This listing is to be ned.in 84 service for. pyin carboo stasi F a - - -. -gf. l... _ -....~... -.... _ s _- -....-- 'a. L.'r:.L ~T* + hN5$$y . r., e isMnan j neee ner. .iGnMikMT1r.:Mrs.::,;:.= J ' ' br - = i

DEC 14 '94 06:16PM GE MEM M J P.7/17 mm.m,m.,_ ,ny,k * , qpn.g'$q;. ' N 4. @ .0MMCh><_ 3 = ao 5 GENERAL $ ELECTRIC ] 408"A'"' . e.y,, c Each of the above materials specifications is to be ordered to its corres-I In the case of SA334-6 7.2 pending.GE specification, as outlined herein. tubes, the material sh i t 3AD3-6. Tt.e use of SA234 fittings is discouraged and in no case is this material specification to be us'ed in any ASME Class 1 or Class 2 7.3 application. l8. C03R0$10N ALLOWANCES The allowances for metal loss caused by general corrosion ~ I 8.1 Document No, 409HA104. The allowences are based onLwater temperature, oxygen' content, and velocity of flow. This document states (sheet no.; 7) that p{tting corrosion has not been Pitting becomes a 8.2 accounted for in these general corrosion allowances. significant factor for carbon steel corrosion during exposure to stagnant / j low flow, air saturated water at ambient temperatures to about 2500F. Document No. 409HA104 provides a general corrosion allowance for these conditions. l Exact numerical values for pitt.'ing allowance under various S 8.3 being reviewed, and a110wance7 kf11 be provided in M&P Ha

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F.o.' 409HA104 8.4 The existance of a. crevice can often cause accelerated corroslon rates, andlsucJrbehavior has been observed.for carbon steel. A' crevice isWhere possible. def t'ned. in' Figure 1.- compohe.n'ts 'fabrfcated'such tha't'crevicat exist and are not readily ,0.q reklaceabl.a should be, elfeinated by: redesign or by sealing;(such as aanA weld' deposit). Where: cr'avises In addition, a.fsetor:of thiaee.(3) .sust:.be 'c'on' trolled (see'$ectio P). . I, thias' the general'corivsf on..all mance must be. applies to ancrevicad region. i.ror' example, if the genere). corrosion allowance ...t,h',$,jrsiiced rejion must be 0.0p481'nch/yr/ surface. l . ;' I . w.. r u.*.. w a>. ? - T..EkWI'RMyNJAf.'.F T 40 C" CINITTATION-DESIGN. Rut.E5 '[4 '/ 9. GG:y!/ SQ K'('g'.'W.. ;sa.?..' liasign strass rul'e' criteri42. T, } i .\\./r 9.1!.1his,.' t" ti.a' tfo crack initiation-of cafhosi.ste@ exposed j f W favid lied' to'.carben. } ..g. ?.W ' 'a ryntants'.?"j' ^ese, rules', are. to be a" 'of Jand' des for,c'esponents wf thi thfGEs i, W - coo and W. '.: sed f: 1 ASME'Secties!!b C1Ms/1:aed' ass 2 i ' g'u.J' /;l. ' st 101 tpng fstas1 Gift' ems for whf k ;:fatighe.' basis: stress anatistilfa' . Y,u '" --~~ - - a yf D.

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l ngn y.:QEN &,OV. iN -wm WT M' A.' & _. } j, . w,K. 0%. _ W:lO!. 1 lrm.. } h.$. Nf&N '} j & Q. Q f & if.l1;[ ? W t'.],:/17..;c + tud at:darsovirenanntal/seashanical 'l f.pxperistatsi ' ' '.... h.i onso ~ ' eth . {,. Ms'fl !1hitisdee.0,e/ + k. Q'.9J.yExte ra i ~ 561'e:S d ijtW1' '88 I t: I 7.5,(y $7 'cE c..afi et : 6' l l g will"ptNV.ipe'- i dai (, d- ~)fadejin' exists ' F.b Eoi tW WR?pri,$iat.1 enviichlient'.. i cr ' 'a'(4 f6r' p(ci ic'.t 6(]i. ssN . l..'. M B : W. 4,.,f * ? '. ' '. ;I h - U. " '. U :: ):: k.,'? 6 , Stres's corrosief 'ct'ackfng 8f.' carbon steel pipingin'op4etting SIAL plant r. 9.3 has not bs PafobTenMidweverf,highfteipperats(ig4cNidi'nhMve; b i si ginited weter;. In' accelerated fatisse"c4C'otcGrein i addition,'appyoxTeate,1y ff fty o)currercas:6(' fat "ence':of' lant i T reported in sus 1T 7 diameter. carbon stee11pibe.used:inithe Sin'.ge eskiince has phown that.sionificah 1 esents#j . F fatigue performance can'.be madel through detalled desiilii' ipio'veldnts nd" systems'. l es. and,c t'i te'rla.l'gfien 'MreiW havfjeen'.l. evaluations, the design) tress. developed to assure that, suffic ent design margin' against craclCinttfitig } ~ l exists for carbon steel compone t in the mf(eMironment; l' A detailed discussion of the technical basis for.derivattion.of these stress rules is. giveri.in the dokument "Fatijpse Design Rules for Carbun 9.4 Steel Components", by 5, Ranganathi as part of.the Ma l This detatted.derivat1on'.is als published in NEDC-163226 *ttRlEnvircre i i j sental Cracking Margins for Carbon Steel. Piping"'In tMs'la%nnual r 4th.Ses t tth report, i I. Repert. EPRI Contract No. RP1248-1, July 1960. derivation of'thienvironental' parameter is. presented.irittiin tha) se'ction entitled "An Altes'r. ate Stress Rule Formulation!forf.fetiguit-Crack Initiatioh"'. J.0< Heald. lThe final synthesized 'and: reffned set of da' sign rule's.as: presented hbrain, are discussed irt usra detati'.at part of the ingin.eering Team rehponse to the Design Review Rfport.' - 9.5 Exemptions and Apolicabilitt Although th'e fatigue stress rul; s are used in conjunction with the A%E e Code fatigue design inethods, there are a number of cite.umstances wtiere i the rules do n'ot. apply and, sho'uld not be used. to suppienent the normat Code feticluet design procedures.l The exemption $. f alr(sdy substantially conservative. design' foQelected piping. system. i 'to their use are sinearized in 'the diagrearof'Figurt.2,a ,j 8 f 9.5.1' Fati ue stress rule evaluations are t'o bh ffenils"fsrirEiclEhiM$i'4UWfhdn'.. n d Mtedhtppygg(@sticsl. stet piping systans ind' .Secti.ofIllfat.ipvedesihsa,' plastig;apatyii.fsn.!d j t th i ~ nozzle'. safe edds any be.used to. show adequacy rather;that'.requirfag'm. e I 1 manufs.cturer. tof provide /that analystsJ.TWanstysis' ., a 4 reactor yess3 Wh y f ' iv .i. RF i.18.lE9.4513h( i f.h o t NEGOSh7 1ThFrui ~ 'not spqWy htNe _.,,, A . v J' U.4 d d d. j j [] ] tere...j$',h - /

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DEC 14 '94 06:19Pt1 GE TAJCLESR BLDG J P.11/17 mmo. IC ' >j sosHA414 SENERAL$ ELECTRIC o =1 nua.eu.ennev susamsonour / Elbows. tetts, and valve bodies are exempted from fatigue design rules avlysts; these components already have large safety margins N[ j j 9,6.2 when designed in accordance with A5ME Code procedures using the p l stress indicies given in'.M8-3600, 'h j Transients having tom cycle times of ten seconds o f 9.5,3 14 provided that the oxygen. content of the water does not exceed $x Y 0.3ppe. All transients where the. metal temperature does no't exceed 3500F g are exempted from fatf ve design rules application. 9.5.4 3 i y 9.5.5 All systems containing only air or gases, wtth tha exception of g.- steam / water mixtures, are exempted froe fatigue design rules g applications, 3i 9.S,6 The da' sign rules apply where tensile loadino occurs and ders i 1.1 The~ stress range shall be defined by the anximu y 4 \\ range for the non-exampted conditions. -' 1 In situations where the P+Q stresslisits are exceeded, the A$ MEI I' b,. 9.5.7 Code requires plastic analysis. rules tre applicable only when the AM Code simplified elastic-is u

'-'l f

plasticanalysis(N6-3228-3) When detailed finite element analysis is used to d j[ ...E correction would be required on a case by case basis. The latter analysis is not ordinarily done at present. ?* Application of Fatigue Desip Rules to Carbon Steel Pipino and .h 3 9.6 ] Safe Ends The design rules consist of four factors that supplement the presen j Code fattgue design procedures, and are categorized as fo11ov5: 9.6.1 ~ A new set of fatigue strength reduction factors for butt welds 4 m a. only (K ) f ) based on the Nether analysis to account i b. A notch factor ( local yielding. j for the effects o i A acan stress correchton factor (Km) c. l An environmental corfection factor (Ken) d d. { 1 ping fatigue j With the inclusion of these four factors for $y l analysis. the peak stresp amplitude is given 4 i i f Sa.h 1/2K Kn e enK $n KK a i f j i ~~~) f w rungs ~sf"httoMstlarpetaryvtecuneey strePA 1 .salesfat.ed..usJng cesse.nt.iesai A$E Cees p : M -es --dev T.-- ~', N.v ' Ed. ..q.:. b et v ~" -Q "^ , - l: } .wu. S A-S* {- \\ -= g -=- -"'W gi

DEC 14 '94 es:1 W GE m m u y P.12/17 _... n v,,,,..<.., _., f" h . v %..P,. '. p.%. : d 'ff;'.!.,u ;t 'Wl .:b,.,, f' N u ' !f

,..hkhkh k,((h

[ 408HA414 s m 11- [k nev 1 i. 'b" i autefE48eno0P 3 s and'(eplastic straficoifactied factor-(based on simplified elastic- ~ ~ ~ ~ ' plastic analysis) spectft.ed in NB-36$3,6 of the ASME Code. iur new factors follows. Prior to iritfal ~ i I The spe[ific fore of e'acn'of..the f alplication o'f.theM' factors and.tde.above.equationi the. designer is urged to i9.6.2 revtew the refere'nced documents. fora thorough understanding of the origin i l i and ' derivation. 9.6.2.1 Fatioue Strenoth Reductio Factor (Kg) Pipind Analysi(s_ i i 9.6.2.1.1 Fatigue evaluation of piping components is typically ' performed using the stress index values specified in l Table M8 3683,z.1 of the ASME Code. How2ver, for the { fatigue stress'irule evaTuation, the stress indices i specified in Table I shall be used. These values are the same as those 'specified in the ASME Code except that the 2 stress index for girth butt welds are somewhat higher. K 2 value In computing the other factors for piping, the X shall be used as the fatigue strength reduction factor K. l f 9.6.2.1. 2 Notches For notches in. carbon steel components, the fatigue strength factor is determined as follows: For Notches: i K.) g Kf=1+y,g where: t = theoretical stress concentration factor of the notch K p'

  • unterial Constant
  • 0.019 in, for carbon steel

= notch not radius (in.) o } 9.6.2.2 Notch Factor _ (Kn) The not.:h correction factpr Kn depends on the ratio Sn/33, where f f .. = ME Code. allo ble dGSign stress intensity-value--..- ) for carbon steef t i -l[..,w.. ;.; NCOG $07 L .... X;l' L ~ a .g

1 k,) !]3 t a

s. /

,X T.',tLE I 't e-STRE5S PIOLCES ftl1 ESE titTM ttpAtl0N5 Im NS-3650 n t. j k Otot Apritcable for n,/t Ice) f .; 4 .j-: / e. _ 1befuel y Momeet ,,,7 Leedtag i laternal toad 19g ~ [ i..~- ~, m ssure h E K C3 h 3 Cg 9 2 Cg 2 1 8 Il ?! W a' 1.c I I.'j,.hlag Products.and.)etnts 0.5 1.0 1.0 1.0 1.0 1.0 1.c fu ' i..y. h ttles

'Stydght' pf pe remote *from isales er other discoetettth twlt wid,between steelst pipe er between 0.5 1.0 1.1 1.0 1.0 1.1 1.0 0.5 1.1 I

1.0 C.5 1.7 h ;'h fpipe end butt weldtag cimponents o 0.5 1.1 1.7 1.0 1.0 0.5 1.1 1.2 1.0 1.4 2.5 1.0 0.5 1.7 rq ' ' fa Cftesh ~ - ' -.(b[i n-welded.t 3/IS* (and 8/t<0.1) (W - v;

(ci,hi-ugided r 3/16* -Loe,5/t>0.1)

$. 's. ='-l 0.75 2.0 3.0 1.5 F.1 2.0 1.8 1.0 3.0 !gu'C4.m, }s.,'<"y$htrtR f111et.weid.to.soetet w lAfttttags, slip a [.,..,.b,e(P.anges. eisecket welding tiantas .m:- h i 0.5 1.0 1.1 1.0 1.0 1.1 1.0 1.1 1.0 t.2 1.3 3.0 1.2 gk p , tang %udtaaV bestt welds.ta strafg t p pe r 1.c i.e ..,',;.- L61as welded.t>3/16*. 0.5 1.1 %.2 ~ '1.7. 7 1.3 8 {n o.5 1.4 2 1.~ t.o f(. >.fl,ep flesh - s

g. '.0 Q,

lLcT as e lded sc3/15" 9 6 1,g 3,1 (%, '. ' {eM trusttfon joints per M 4425 and Fig. 1.3 1.7 1.0 4 1.4 1.7 /rf 0.5 1.2 1.0 { '--

  • MM{a)1, flesh or no girth weld closer than 0.5 1.3 1.0 1.7

,, (b) 'as welded 1.0 2.0 1.7 h coruwttleas 'per 118-3643 3 1.0** 1,0 0.5 1.5 er butt inaldfey elbows per ANSI Bl6.9 II h 1.0 1.0 Carved p)i f6.28 w & M 1.c'* i.0 c.5 i.0 i.0 1.s 4.c c.k Buttrweldhg-tees per Mil 516.9 or 'D 1.0 9.5 1.$ ... a.j ; ..ms.s spea - 1.0 N )$ M14 tan.70'ars per M51816.9 or 1.0 .f. ? y.. ~ ~ M,MN. ens .c -."h.ift ..pi pl .,pn .,s'. n. s,1 i 2 C .8 . ?.R E t&M e wIwfe t = naulaal pipe thtctness ,.,.,'*g.Q The calculated peak stress shalf not te less then that obtateed if ~.4%s. tt we.d equattees of Sectica 5 ae used. 9p $$ the tiet .1 d - ;;.':3 'X' .O N {;;g!;-qj g m". -- m't wr.'u mws, f JL v g.;_.3_ i l

DEC 14 '94 06:21PM GE NJCLEAR DLDG J P.14/17 ^ :r e ngt 't. ~.*r .~ . L. - s.* A,...s . a V.s <,-.. ,._,a, .lr. s .. p ;., ^l:;. u....> nuct.unssendf GENE (AC TELECTRIC W" = T3 3 'n::.-

  • l 1

_______ a 4 etmNessenour. f ,=--s u' For E v theff ari thret casts to consider, ss fc110ws! [ n Sn 1 g.I for 0 1 z s y (k to.sn.1) (K (g).)] 3 s, I T

  • W
  • 1 f
  • I+-f

~ ' ' ' ' K y) n f 8 '" f6f - 2:. I K, = Kf 9.6.2.3 Mean Stress Correction Fa'ctor (Km) is# The mean stress correctio'. factor Km depends on the type of loadirg h,, n being considered. as follows: f ty For fully reversed load cycling (tens 19n-compression): i K, = 1 ii 1 v E For load-controlled cycling at any R-ratio: U, t 2 ( b* (1-RJ \\ where: Smin/5,,x and R >= minimum not section r, tress for the stress cycle being Sogn = analyzed,and msximum net section stress for the stress cycle being S, x = analyzed. 7: a. ' r ,i h 4 l 5 tdE50 807 (

-..... g.?,.15'17; DEC 14 '94 06:21m Gt rm y GEIIERAL $f LECTRIC j"l* n.u.c.LgA.n. 0.o.S,Y ENEA I, to a maximo deflection and return: i for 0 1 1 Em " E I 0.32 (2 - s" ) 1 Sn 42 [

    1. % *75 y e 1.1 +

3 (2 ) In 2 i g.1.1 for g i L Environmental __ Correction [ag (Ken) 9.6.2,4 depends on the ratio The envirorr. ental correction factor, Ker.,tants N and N', as foll.us: Sn/3Sg(1-R) as well as.td empirical' cons S' fir 0 4 3,,j 4.35 Q=1 33 gh,y < 1 -0.35) for 0.35 4 Ken

  • I + H (3

.g} g Sn I Ken " "' f " 35,t1.RJ l The constants H and n' have the following values: t Environment i Water Unstant Mr I o.1 ta 073p,w oxygen {> 0.3ppe or Unc.J3 ~ 3.5 H 1.0 2.0 3.3 N' , 1.6 2.3 F 4 . = - r ,,m - d' .$%. 8 '.s?N-; Yhk.1$0k'@Y$$A$$5hS C f ** ~ 4 98 . egg g

  • es e'

e.*** 4 supuutus

.. ~. LCC 14 '94 06 21PM x M m m 3 P.1g,, -.,,...,~.,--.7, ...~ ney p 4:.. t.c.,.v;.... .Ns ~ i p.s.,,uic.e y. :u..y", s.,'v.p* * . f. s.. -. ;.3'%: ... c+ Q '.:L :-+%.---.'.:...-.k' ... ;h.,N: :. ' ?' t-htals orbact W12Mi licaF e,only.edien the water TteJ',epyj de ag' th h ent1 fati ue cycle. If a c ..ypAs,syg.4p'.?to'g'Tgreeterthan i-Is.or i .. ensiin,, a 2 .T i to} app . 7...... <n : ... i 1 4 ~.y tud. s.... ~. aefo(ses the transition point t Eor ttiefmal'trensfa"g :....... Y<, . 9.,: s........t.. ,the ...s (Seefi9dre),.ths;fo;.ng multip;1( Jsf.1,1sgjeg.'on the :pfsctor only. i T jf ;U/. [ ? ~. ?.l. 4700F ) Tj i M = 1/ Ken for T < 470 F j 0 a 2 u I-470 [470 - T ) 3 2 0 for T2 > 470 F 3 Q+ M= Tj i T squation assigns the environmedal factor only to that part of the stress range which occurs during the time when T > 470"F. This If the fatigue usage factor re4uirements for a specific couponentof m 9.6.3 cannot be actfeved using the r ne ysis of the couponent using only stress rule criterion, thenthe maxinum principal tensile stresses (sub If after this reenalysis the 4 range of stresses) can be conde:ted. fatigue usage factor requirenents.are still not achieved, the destper is urged to censuit with Plant Materials and Machanics Tact nology. [ i The desip rules described.here havh mean applied to approximately 50 data potats ressittag frors pipe and fatipe spectuen testing 9.7 (notched and s.nooth) at 560 F in vafious af r and water 0 Figure 2 shows that tha design rule equations are able to correct current date ao c.1mply with the 4 Code section 111 design curve and, at the same time, the eqmetions are not sve-ly comervative w' respect to the Code saw 4te curve'. t "l tws.. ~. e e e q, p

EC 14 '94 06:2 M E m m u y P.17,i e m w m s m ~' 1. m w o m a m r m s Q;rp., u,e.a g ga .a

w. > m,w >1
  • .~ 4 p r m mm.. A; w:.

...,, m. :., - y 6* 4 . 'i ~ y - g -- -.- o ' $dk . F. F,wj 1 - g g. i 1 o n.& e .uan s u:-. o o 3: ) by, a Jj L'@.110, p 8 n' ....o i i i; f E \\ ' d.' W & ed eN = }'

t a.

a 1 . a. fi "l 2 w, y E ~ 5 o* h i E e5 g EN u d g?g.?g.*g.'s*g: 3 0 ',

  • ?

a r ~ s g "., ose<<n> ". I t h f 1 'I. ]{ 9 g E_ 4 '4 u8 L j

  • h

'j T~~ E o i b .l a '] C

l j

s .-1 a e B e, 3 2, y 3 g E e M h 4 M E.': [- )i esu U' : y g 4 I *- m t5 N, .a a g.; 5 d a i... i d i.m a s - v4 7,* hi L.. i I. Ja i, % l A E.5www L. iai.;$ Gin %L :.:h=n ~=&". hn, 9 9 .,e W,., .}}

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