CPSES-200301005, Relief Request C-2 for the Second 10 Year ISI Interval for Unit 1 and C-7 for the First 10 Year ISI Interval for Unit 2 from 10 CFR 50.55a for the Purpose of Invoking Code Case N-562-1

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Relief Request C-2 for the Second 10 Year ISI Interval for Unit 1 and C-7 for the First 10 Year ISI Interval for Unit 2 from 10 CFR 50.55a for the Purpose of Invoking Code Case N-562-1
ML032600942
Person / Time
Site: Comanche Peak  Luminant icon.png
Issue date: 09/11/2003
From: Madden F
TXU Energy
To:
Document Control Desk, Office of Nuclear Reactor Regulation
References
CPSES-200301005, TAC MB7947, TAC MB7948, TXX-03159
Download: ML032600942 (11)
v • d • e


Text

@hTXU TXU Energy C.Lance Terry Comanche Peak Steam Senior Vice President &

Electric Station Principal Nuclear Officer P.O. Box 1002 (E01)

Glen RoseTX 76043 Tel 254 897 8920 Ref: 10 CFR 50.55a(3)(i)

Fac 254 897 6652 10 CFR 50.55a(g)(4)(iv) lance.terry@txu.com CPSES-200301005 Log# TXX-03159 September 11, 2003 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555

SUBJECT:

COMANCHE PEAK STEAM ELECTRIC STATION (CPSES)

DOCKET NOS. 50-445 AND 50-446; RELIEF REQUEST C-2 FOR THE SECOND 10 YEAR ISI INTERVAL FOR UNIT 1 AND C-7 FOR THE FIRST 10 YEAR ISI INTERVAL FOR UNIT 2 FROM 10 CFR 50.55a FOR THE PURPOSE OF INVOKING CODE CASE N-562-1.

(UNIT I SECOND INTERVAL START DATE AUGUST 2000 UNIT 2 FIRST INTERVAL END DATE: AUGUST 2004)

(TAC NOS. MB7947 AND MB7948)

REFERENCE:

TXU Energy Letter logged TXX-03046 dated March 5, 2003 from C. Lance Terry to the NRC Via the referenced letter TXU Generation Company LP (TXU Energy) requested relief from the ASME Code pursuant to IOCFR50.55a. After a review of the subject Relief Requests, the NRC staff requested additional information with respect to ASME Code Case N-562-1. TXU Energy is supplementing its request for relief from the ASME Code based on the additional information requested by the NRC staff. The changes are clearly identified by the revision bars in the attachment to this letter.

A member of the STARS (Strategic Teaming and Resource Sharing) Alliance Callaway

  • Comanche Peak
  • Diablo Canyon
  • Palo Verde
  • Wolf Creek

Q TXU TXX-03 159 Page 2 of 2 This communication contains no new licensing basis commitments regarding CPSES.

TXU Energy requests approval of this relief request by September 30, 2003. The approval date was selected to allow use of this relief request during the seventh refueling outage for Unit 2, scheduled to start October 4, 2003. If you have any questions regarding this request, please contact Jack Hicks at (254) 897-6725.

Sincerely, TXU Generation Company LP By: TXU Generation Management Company LLC, Its General Partner C. L. Terry Senior Vice President and Principal Nuclear Officer By: &l 'arAL

/Med W. Madden Nuclear Licensing Manager JCH/jch Attachment/Enclosure c- T. P. Gwynn, Region IV W. D. Johnson, Region IV M. C. Thadani, NRR Resident Inspectors, CPSES Terry Parks, Chief Inspector, TDLR J.C. Hair ANII, CPSES

Attachment I to TXX-03159 Page I of 4 TXU GENERATION COMPANY LP COMANCHE PEAK STEAM ELECTRIC STATION UNIT 1 SECOND TEN-YEAR INTERVAL ISI RELIEF REQUEST NO. C-2 AND UNIT 2 FIRST TEN YEAR INTERVAL FOR ISI RELIEF NO. C-7 PROPOSED USE OF SUBSEQUENT ASME CODE EDITION AND ADDENDA PURSUANT TO 10 CFR 50.55a(g)(4)(iv) AND INVOKING CODE CASE N-562-1 I. ASME Svstem/Component(s) Affected:

All ASME Class 3 Moderate Energy (i.e. less than or equal to 200TF or less than or equal to 275 psig maximum operating conditions) Carbon Steel Piping Systems.

II. Applicable Code Edition and Addenda:

ASME Code 1986 Edition (No Addenda),Section XI, IWD-4120 requires that the defect be removed or reduced in size in accordance with Article IWA.

III. Proposed Subsequent Code Edition and Addenda and Code Case:

TXU Energy proposes to use 1998 Edition, ASME Section XI IWA 4000 and invoke Code Case N-562-1, to repair the piping section or similar conditions found in other Class 3 piping during the corrosion monitoring program (CPSES procedure STA-730, "Corrosion Monitoring Program").

Relief is requested from removing defects and repairing in accordance with the design specification or the original construction code for internal wall thinning or pitting resulting from conditions such as, but not limited to, microbiological corrosion; cavitation induced pitting; erosion/corrosion and/or localized pitting corrosion.

The ASME Section Xl Code Committee recognized that an alternative existed for internal wall thinning of Class 3 piping systems which have experienced degradation mechanisms such as flow-assisted corrosion (FAC) and/or microbiological corrosion that would provide an acceptable repair configuration. This alternative repair technique involves the application of additional weld metal on the exterior of the piping system, which restores the wall thickness requirement. Code Case N-562-1 was approved by the ASME Section XI Code Committee on July 30, 1998. However, it has not been incorporated into NRC Regulatory Guide 1.147 (or Draft Guide (DG) 1091) and thus is not presently available for application at nuclear power plants.

This code case is denoted in NRC Draft Guide (DG)-l 112 with the comment that,

"[N]either the ASME Code or the Code Case have criteria for determining the rate or extent of degradation or the repair or the surrounding base metal. Reinspection requirements are not provided to verify structural integrity since the root cause may not be mitigated."

to TXX-03159 Page 2 of 4 TXU GENERATION COMPANY LP COMANCHE PEAK STEAM ELECTRIC STATION UNIT 1 SECOND TEN-YEAR INTERVAL ISI RELIEF REQUEST NO. C-2 AND UNIT 2 FIRST TEN YEAR INTERVAL FOR ISI RELIEF NO. C-7 PROPOSED USE OF SUBSEQUENT ASME CODE EDITION AND ADDENDA PURSUANT TO 10 CFR S0.55a(g)(4)(iv) AND INVOKING CODE CASE N-562-1 CONT.

In response to this concern, the TXU Energy plans to implement Code Case N-562-1 through the industry standard NSAC-202L-R2, "Recommendations for an Effective Flow Accelerated Corrosion (FAC) Program," for calculating the wear rates, forecasting remaining life, and conducting inspections of FAC degradation at CPSES, Units I and 2.

This is proceduralized in STA-730, "Corrosion Monitoring Program."

Pursuant to 10 CFR 50.55a(aX3)(i), relief is requested to use Code Case N-562-1 on the basis that the proposed alternative will provide an acceptable level of quality and safety.

This relief request applies to ASME Class 3 moderate energy piping system (i.e., less than or equal to 2000 F and/or less than or equal to 275 psig maximum operating conditions) carbon steel piping.

IV. Basis of Using Subsequent Code Editions and Addenda and Code Case:

A number of alternatives (e.g., Generic Letter GL 90-05 "Guidance for Performing Temporary Non-Code Repair of ASME Code Class 1,2, and 3 Piping", Code Cases N-513 "Evaluation Criteria for Temporary Acceptance of Flaws in Class 3 Piping,Section XI, Division 1" and N-523-1 "Mechanical Clamping Devices for Class 2 and 3 Piping,Section XI, Division 1") are currently available and approved by the NRC for evaluating and repairing of piping wall thinning and pitting (including through wall leaks). Nonetheless, these alternatives have limitations and do not always encompass the specific situations that arise from a piping leak.

While the guidance provided by GL 90-05 and Code Case N-513 could be used to evaluate and accept the leaking condition, if the structural integrity of the piping can be ascertained, the leak would most likely continue to increase in size over time and would pose more significant housekeeping difficulties. On the other hand, if the flaw exceeds the acceptance criteria provided by GL 90-05 or Code Case N-513, an emergency code repair (which may include up to full piping replacement of the affected sections) would be warranted.

Therefore this would pose a significant hardship on plant operations to isolate and drain the affected piping sections (some of which are not isolable and would require extended plant shutdown). For that reason, TXU Energy requests that relief be granted to use a weld overlay in lieu of a code weld repair on Class 3 moderate energy piping. This would provide additional insurance that an unscheduled plant shutdown could be avoided.

Code Case N-562-1 provides an additional alternative to the IWA-4000 requirements for the repair of internal piping system defects or degradation. Please note that the ASME XI Code Committee determined that such a weld overlay would restore the minimum piping wall thickness at the flawed location and would ensure that an adequate level of quality and to TXX-03159 Page 3 of 4 TXU GENERATION COMPANY LP COMANCHE PEAK STEAM ELECTRIC STATION UNIT 1 SECOND TEN-YEAR INTERVAL ISI RELIEF REQUEST NO. C-2 AND UNIT 2 FIRST TEN YEAR INTERVAL FOR ISI RELIEF NO. C-7 PROPOSED USE OF SUBSEQUENT ASME CODE EDITION AND ADDENDA PURSUANT TO 10 CFR 50.55a(g)(4)(iv) AND INVOKING CODE CASE N-562-1 CONT.

safety is maintained.

The primary purpose for implementing this alternate repair method (installation of a weld overlay) is to avoid the need to extend an outage to perform code repair and possibly piping replacement. It also allows for adequate time to perform additional evaluation of adjacent piping so that pipe replacement can be properly identified and scheduled to reduce impact on system availability, increase safety of plant operations, and reduce cost for replacement materials and labor.

Additionally, TXU Energy is proposing the following restrictions on the use of the Code Case N-562-1, to assure that the use of the Code Case will provide an acceptable alternative pursuant to 10 CFR 50.55a(a)(3)(i):

  • The scope of the alternative repair techniques in Relief Request C-2 for Unit 1 and C-7 for Unit 2 is limited to repairs of ASME Class 3 moderate energy (i.e., less than or equal to 200° F and/or less than or equal to 275 psig maximum operating conditions) carbon steel plant service water piping systems.
  • Repairs are limited to internal thinning or pitting caused by general localized corrosion, such as microbiological corrosion; cavitation induced pitting; erosion/corrosion and/or localized pitting corrosion; but excluded are conditions involving corrosion-assisted cracking or any other form of cracking.
  • TXU Energy will evaluate the use of Code Cases N-513 "Evaluation Criteria for Temporary Acceptance of Flaws in Class 3 Piping, Section Xl, Division 1," or N-523 "Mechanical Clamping Devices for Class 2 and 3 Piping,Section XI, Division," or N-597 "Requirements for Analytical Evaluation of Pipe Wall Thinning,Section XI, Division 1", prior to use of Code Case N-562-1, for the identified Class 3 moderate energy (i.e., less than or equal to 200° F and/or less than or equal to 275 psig maximum operating conditions) piping system repairs resulting from phenomenon such as flow-assisted corrosion and/or microbiological corrosion. When engineering evaluation determines that the aforementioned guidance or code cases are not suitable, the repair technique described in Code Case N-562-1 may be utilized for the particular defect or degradation being resolved.
  • The repair will be considered to have a maximum service life of one fuel cycle.
  • The SMAW, GTAW processes may be used for these repairs on piping that is empty; however, only the SMAW process may be used on water backed piping. This process,

Attachment I to TXX-03159 Page 4 of 4 TXU GENERATION COMPANY LP COMANCHE PEAK STEAM ELECTRIC STATION UNIT 1 SECOND TEN-YEAR INTERVAL ISI RELIEF REQUEST NO. C-2 AND UNIT 2 FIRST TEN YEAR INTERVAL FOR ISI RELIEF NO. C-7 PROPOSED USE OF SUBSEQUENT ASME CODE EDITION AND ADDENDA PURSUANT TO 10 CFR 50.55a(g)(4)(iv) AND INVOKING CODE CASE N-562-1 CONT.

SMAW, may only be used on water backed piping with the special requirements as stated in Code Case N-562-1.

  • An evaluation of the degradation mechanism will be performed to determine the reexamination schedule to be performed over the life of the repair.
  • The provisions for implementing these alternative repair techniques will be addressed in CPSES Repair and Replacement Program Procedure.
  • Weld repairs will not be performed on surfaces that are wet or exposed to water, such as those from small leaks in the piping system.
  • The initial re-inspection of the weld overlay and its surrounding areas will be performed within a period of no greater than 6 months.

TXU will implement Code Case N-562-1 through the industry standard NSAC-202L-R2, "Recommendations for an Effective Flow Accelerated Corrosion (FAC) Program," for calculating wear rates, forecasting remaining life, and conducting inspections of FAC degradation at CPSES, Units 1 and 2.

Therefore, the proposed alternative is justified per IOCFR50.55a(a)(3)(i) as the proposed repair will provide an acceptable level of quality and safety.

V. Duration of Proposed Alternative:

This relief is requested for the Comanche Peak Steam Electric Station Unit 1, second 10-year interval, and for Unit 2 first 10-year interval.

Granting of this relief request will not have an impact on plant quality or safety and will not adversely impact the health and safety of the public.

VI. Precedents:

1) Southern Nuclear Operation Company's Hatch Plant, Units 1 and 2 (Reference SER dated May 31, 2000, TAC Nos. MA6123 and MA 6124).
2) Entergy Nuclear Northeast's James A. Fitzpatrick Plant (Reference SER dated November 14,2002, TAC NO. MB3750)

Enclosure I to TXX-03159 Page 1 of 5 CASE Nt562-1 CA !r ASME BOf AND FSUREM VM CoM

£ptvalC At Wls ,"a

$M tMeAC *wx br exph*n and SW AL-nmom SIM Cae N-S621 Cas ha aply. In adwlyt w.e thkne Allrtatvaw Requ~rements for Wal TiWham of filler mea applied ova mple rpirs dul o Rallon o ~aus 3 Modmt Ewr Caron exee dte al mama thckess of the pipg.

fteel D'l Seedl= AI Division I AInqhr As an ahenmti to aptuament or bnma .O IML EVALUATION weld sqa. wha rq n may be appried for -le mae benath t mie o wa wchfwiel wall dti5cmesn ican n of Om 3 modcr=:ney ovalay Is to be applied shal be auaed oo etsh aibon sl ppi sym t khave spermeaced t cxisting avege wUll t n nd nex lans wall dhining or piifng from condans such nd wanfigotr d *xdea eo be reed by hwe as. but x limbd o.% iow-ssLed CDwoSl and mi- weld ovefa. Cr_*hl sAll be given iodieas arohlgical ==ion? ofdeWubtk. Te extent of adation ihe ppn ad Se dr= of Orep& oan t piping shafl be R*q4 Isk espialon of Ot Cbmmie th ar evaluaed In arance with IWA 4106 of Chu 3 modate e y (L. les than of qal to 200'F or and kess ataequal 10 275 p8ig mi-mm opwxing conditons) carbo ste piping expe eacing intbrnal ining or pIbing my ha"k the wAD 30 DESIGN tices saind cxtnally by mas of a weld-deposIe cabon cr low- aye redfesm on c ouside vfa of tde pIng In accardac with fi) Un otherwis esabSld by dtercl at the olwing requamems Excuded fmm tew p- experimentiaalysi or by prof Wtin as povid vW=en ame moultimn Invotving e vosianssisted for in Piam M. or paLs 3A. the foM Uticmeu of the aacking cc ay atea km of racking. welT ovrlay ghl e d I dt C of at Ulet J I acu diection beWod t aue pedie eave dte desin life of dt h res ion to f p aquitnd &kbcu4 U GENERAL REQIUEMDUS f() ekwAD thickn mat o be perfoned In awcordance with a RepaidReplacernent Plan saatlsing tc reqirtmeas of WA41MISO R-m outer "dus of the camoonen Wb Toe vaai AU=kes vtramioc shal meet the to.-Oominal wal tickness fthecompowe nnquirmnts of IWA.4 vicept as state in ft Cast Edges ofthe wed ova h be p o the (c) If die minimum xting pipng a at A Ma" an&(le

" in ied knes of depoited weld mea secssary io zatify de rquiments of Fig. 1)of 45 deg. Final eoofiguation of th en e-puL 3.0 Is guter the nminal dckness for die mmt $ pemit te eaminain ad c tnls sie and shedulef the pipin t povisdons of tdis euied hrin, icldn any required prsrvic or sevice examinatio of encompamd or aae

'IWA4140 b te 1599 an wfit c 1Me 3 1"AdWa fwlb 1991 1d. IWA4130 (1Ami bt w in ii 19 Edsmog

  • fic 1990 d ad aliensIWU d JAddcL vWAAu I in 193 Ede Uvi t 191 Addnd ftol

'AIA4MWMnAO sl tWi.Mow= a A*Cab ie.n aie W5 Edtbn IWmA4130 (Rqpir hunIn in 1 EIt9RW wkb 1,9 Man wibh ft 1990 Adkd and dwhr Eam sd t 1990 Addb And sfer EMdm ad A&Sh Aida. 'Dsign aidmos as pted by dIhCdawacOn Coe 9W9 6.2 - N

Enclosure I to TXX-03159 Page 2 of 5 CASE (contnued)

N-562-1 CAMF Of MUhI MMI* AiM NtEMW VEMD.CM

() The thickness sal be sufficien to mXain (1) the base rtal isof the ame PNo. and rosup required thckea fr fth predicted lif of the aepai. Number when ipact properties am applicable. as tde S& xoe for e taperd edges. the overay shall basue waW tse have a niaorm thicknes. (2) te secified minimum tensile strngt of ik (c) The i strength of Ih weld Wr metal for item, does mot exce dtha spe= fed for the base m eal the ewforcement all te at kea specified for tested. .

tbe bx =ul to which it Is apled (3) fth avrgeticns of do overlay wen is (d) VWe predicted Maximum diegradaidon of the ove- at least the shcka of the mociup plug, m; id piping nd the overly ever Oe design f of (4) dhe overl apn the fDA thickwne of base incal.

the mtastmda sa be considered In te design. The S. is at kis that of the mockup; predicted ftdegadton of the pipng shl be based Wmo (S) die transidion angl at the ieredges of the lsitud inspection and established data for similar bas overlay, a. is amt grater than that of the mockup; menls If te weld overlay is predctd to become Ed)she overa y suface finish Ii smi lar to or exposed to the cocrodin medi=m Me preictd degrads. smoother tan tdw Useted; Von of te overly s be band upon esublished daa (7) the maximum. proporttonate axial dimension.

fhr base metals or weld mtds with similar hemic LAD. is met Ior tan that tested; comoitin to that of the fille mctii wed ft Me (8) the maximut proportionate circumferential. di-wed overy. mnension. CAD. is amr ame ta that tested-(e) MMeffc of weldd oay pplcation on knenior f9) the nosninal diameter Isams less Omaone-haf aft dhll be aulessed Inhe Reu ac nt a rm or thang two trmes ihe diam ete ested; plan (Rerair PoRCmi. (10) die macsinaIlik eselnee ratio. W .Dis not kas than one-hlf v c mome ihan three mimes td e W. "so Sested, 3.2 Design Ib) 'Tbe mockup bas shall csist of aew basn TM design of weld overlays am Fp ale by Mterial of similar configurationt orype of m as V== 33. . or 3.5 all be In accordsace with the te ken to be overaWd A rounded-coe eg t of applicabk sequcrments of t Constrion Code or fs base material s be removed to mpeent Oe D-O3100 ad ND-MM Ifluding Appendix 11. nd mnaxinmum propotonate sie aa dnsion of Land sha consider h wed ov"eay a an integral pmrlon eircundirentialdimension of C) andloction of thinning of she piping or vorrponent Wpon which it Is appfied or pitting to be compensatd fodrby t weld overay.

no as a wek Th alowale sWm ve of fth A plug of the me bse mea ad of munirm thcmess base al shall apply to fte design of t deposited a, which al of exced the sallea ayaW tkness weld el T Mollowing (mctUs be considered. on which the overlays will be permnently applied, a aplicable. in he desi and aplication of the shl be foil-penetraton welded wounid the opening and lash wit t outsid surfce of tc piping. Aterna-(a) Ue shrzne effects. if any, o te piping. verly, an equivaln volume of base mel may be

0) Stres Concentrations caue by applicstion of removed ftm die inside sfasce oft mo pby dw oveday or resulting tMM existing and predicted machinin or grindn without teed fo weldg in a piping interual suface cofgudm closure plug.

(c) The mtocimp weld overlay shal be applied in accordance wifh te dsig or spcfied configiration 33 Prof Tat Qoaification as a Pkpn Product using te specified weld file metl Mximmseaction At alternative so design. the conftion of weld dtickness at the overlaid opening (weld mea phu base overlays my be qualified by pedrmance of proof eal plu&g + w) sal sot ex d 71% of the testing of a snockup to accordance WMithe fofllowing umna ticess of the pig.

fd) Staight pipe equivalent so a Minimtm of one (a) A satisfactory mockup burst test shl qua pipe diameter. or onehalf disamer for Piping Ovr he design or coniguration for applicam on i 1h ame NPS 14. ahall be provided butt-welded In she mcump.

onentatiosatheswoe t of kem. and qhe saun if acessary) beyond both eads of he oeray. The location on litings. when th folloig coaditons WC piping sa be upped and he eonrpleted mockup ified (we Fig. It assembly sha be tougl vented and kydzsbtically SMP. 2 - MC 920

Enclosure I to TXX-03159 Page 3 of 5 CASE(conthwed)

N'562-1 CAMS OF AMS OM MO n M W aOn I- re tested to bwst To qiaify the design for pmvided alt of the following cooditios at satisfied

&enel applaton win Me 1m o pafsF3Xs In Fig. 1:

b=s pCMs SWal Act be les than: (a) All of the ssquiremew~ of pam. 3.11 ap*ly s m t >~~~j9- (b) Ile provisions of pru 3.3(e) dll be m (c) bc full AM* s of weld overlaSha exceed a maiuoum axial length of die cream of six

i. or de o uade dam of te piping.

whats ( r finihed ovela sa be dalar. onval. $A-P-minimu-tm acceputble, bumn pmswre, psi dicmferential. Or rectangular in saxpe.

t- minimu Specified thiciaeSs (excludng =Mn. ft) For each fepahs, he a dimensiont-facoving solerance) of the base Metal beig penated by i cIrcula overlay stall am %xned

% dhe notn Ltraid diamtr of the piping.

Suct' ve*tepfldectu2l Wremie iength of te base metal (2) Rectangula overas shall be aligned puallel being w d.psi with or prtpendi&Az so the uis of de piping, ad D.- Outside &imeterof doe Pipe, in. mers shl be rounded with dl hiss ta due aoey tinem (e) if Raggibiit analysis was equire by the original (3) For aWoverlays. fte ad radii *all so be Constlutim O&4coe the effect of the weld owerft shall - less than 'afiI. and the als of the overly shl be reconciled with the ulgina vanalyis In *bi cms. be aligned pasllel with w pepenfficu to the as Ibr r iar-shaped overl as n piping designed la of *e Piping.

?4D-36S0 and Aligned paralle w perpendicul arso th I e The dista~nce between toes of adjacent overlays rits of the pipbing vunl- a kiwar -s kantenifcation shall am be les than s.

bacto (SUF or I) I extablishd, an SEP (i)of 2.1 shal be applied ifor ovelays onstralght pIpe and acn 4A Wkaaced Applicetios welds, a - muMM14pr of 1.? shall be applied so the SIF (I) for standard ulbows- and an SWF () of 2.1 (a) Manual application of s-aey an watervaclid shall be applied for ms and beach connections when piping Dall be r icted to P-No. I base ateis the toe of fte ovefta is mt less d=:e124/i; SMt WediMg of Bud Overlays alusthe SHAW rocs any branch idel fcrvnent Inj ft. 1. ad low-hydre eactrades. h addon.ecsurfce taunination required In,pars 60 shal be performed 34 hroo Tau QuuMklalour for' 8pedft °o socce tha 48 hor afe completion of welding For such oveays consderaton should be gtiven to As an altmratdve to depg by faalyis cc proof usin a %=4we bead technique similar so that described I~stquaifiatio a piitnOf 3~kxudote design or confgagration of wel overlays may be quabfied itt 0() SPIpin with wall hthikns less han she diaee limited sertice conditin using the prv*Isons ef ,of he lectode ds be depressurized befar welding.

N~D49OO. "wod Taut ao Ettsablih Desipn ftesture.

am~pt tha coaipnent hydroastaic testing is vot requird (other thn = required by IWA-40OO~ Mm macimps S rSTALATION shal be fabriaewd and ftnsed in accordance with the (f) fu eni s face wea to which die weld overy xrvisian ot pu. 3.3(b). (c). and (d), ad ahall be is so be applied shll be examined usIng the Squid applied in accordance wishthedprvisions and conditions vaenant if Magnetic panldce method with acRepanc Of pUra 33(4) The Provisions of PMra 3x3e) shal atra in a dccedae with ND-25Of X for' Ihe ptod-ack tr ase metal or Id) nvolved.

3S Prealulfied Design b)11 throug-wal Meaims are requed so satisfy dhe acceptan citera, or weut from application of the Application of VWel overlays an strigt pipe. polions of kms go less than 2W% toi any breach EAvAsa k a t9 MdBaa @* e t9t A dt feInlf"rocmet in prg. I standard elbows, and amaccatd et 19&dm M-d O 1916eUde wi& tic 195 Adtnod tvogh do IM Wm ft Se M da. IE-20 Ad90 vdeds to cmrect litaited degradation "hl be exaempt in w 16 Efiata h te Os 3937 Addea UVtA WV aw and Iuz fte requiremnemr of pams 3.2 throuh pars 3A, Addo 921 sunW. a- NC to TXX-03159 Page 4 of 5 CASE (contiued)

N-562-1 weld oveay, they shall be gfoplished by sealing (c) Weld overlays a be voimnetically examined with weld metal using a qualified weld procedure as base meti repthr when uuqird by fte Caawmeon suitable for open-root welding Tihs weld l be Code. except U follows:

examined in acorda with paa 5.0(al In adition (I) Wed overlay not exceeding to in.2 sarike th Am layer of overlay over Ihe ,epaied area sAO area ae exempt f(m voiwnetric eamninaion.

be examined la accorac with parL 5.0(&) (2) Othe weld overlays shall be exasupt from (rc Overlay weld Me shal be deposited Wm a volumetric ciambuatln when the fished applied thick.

VeCwelWing procedu qualified hi accordance with mss (wIn Ft. 1) does uo exceed.

Section IC ad the Canastrction Code.Section X ad ta) 1/ for r S % in.

Section M. or IWA.610 and ehher IWA-4620 ct (i 44 in. fix 16 in. t S 21/' in.

IWA46S Th qTalified mimum hikness specified M)The ler of % in. ot 10% oat for >

In fI weld procedure does not appl t th weld overeayor associated base metal repai.

rd ili surface ct te weld overly shall be prepared I- finished tdI-mection thickness of compensated by machining or grinding. as aecessary. to permit area (eg .w+i, In Fig. 1)

Performance of surface and volumetrc examloadons When volumetric exaninaion is inquired. she fal required by parn. U1 Fer altrasonic ex-mina a voiwne of te finished overlay. acldng he Wered suriace Snish of 2SO RMS or bemer is requircd. edges, but Wncuding the volume of base metal required for fthdesgn lfe of the overay, shall be examined using eer te ultrasonc or radiographic method, and shall to dhe depth et the surface oftbe gm ing piping.

sus the acceptac eria for wednents of the 4.0 EXMINATMON Consmiction Codc r ND-53Q. The vcum of the to) Tke completed weld oveday shall b examined existing ppng benat the weld overlay, uken credit usig thc Eqiuid peneum or magnetic particle medhod for infte design, Sh satsfy te voluewtric acceptance and shall satisfy gme surfjacexamiation acceptance afteria of ND-25030 for the product form. or riterla for welds of the CGstroctrHo Code orNDS300 IWA-3000!

(b)rhe weld ovrlayt. Incuding the existing Piping (d) Follow-up Inspecton shall be scheduled as aces-upon which k is applied shall e exmined to verify m7to confirm any design assumptions relative Io rate acceptable wall thiciness. or extent of fte degradatih 7.0 DOCUENTATION WA-SX dn-A IWA-SlO or IWA-40 t o9S9 E oan Use of this Cae shall be documented an an NIS-2 wkh e 399 Addesaf fruM WCLoa IWA- loar3WE42=0 I IeS 9t6 AtIon VA&w I1OU Addkfd ftw 1989 EhON w be 1190 AddoWL 3-= or £WE4Q in dhe 16 M =

mi& t e 917 Adenatw e r Admsuapd Addend xIWAo100 WatIWR.4 In de IS9 Edian Oin *e 190 I acepinio w IWAAM Addena m4a 1ile Ed nd A4&el&

SUPP. 2-C Me 922 to TXX-03159 Page 5 of 5 CASE continud)

N-562-1 CAMU Orsm ASM = £lWWmmz= VZWX =

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