ML20070Q225

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Requests NRC Approval of Encl Design & Repair Package,Per Generic Ltr 88-01, NRC Position on IGSCC in BWR Austenitic Stainless Steel Piping. Crack-line Indications Found in heat-affected Zones During Augmented Exams/Insps
ML20070Q225
Person / Time
Site: Peach Bottom 
Issue date: 03/21/1991
From: Beck G
PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:
NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
GL-88-01, GL-88-1, NUDOCS 9103280256
Download: ML20070Q225 (27)
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PHILADELPHIA ELECTRIC COMPANY x

NUCLEAR GROUP HEADQUARTERS 955 65 CHESTERBROOK BL L WAYNE. PA 19087 5691 (sis)ssosooo March 21, 1991 Docket No.-

50-277 License No. DPR U.S._ Nuclear Regulatory Commission Attn:1 Document Control-Desk Washington,'DC 20555 SUBJ ECP:

Peach Bottom Atomic Power Station, Unit 2 Request for NRC Approval of Design and Repair Package in.Accordance-with Generic Letter 88-01 L ear Sir:

D In1accordance with the " Staff Position on Reporting

Requirements" provided innthe Generic Letter 88-01 ("NRC' Position on IGSCC :in BWR Austenitic Stainless Steel Piping"), Philadelphia Electric Company (PEco). requests NRC: approval of a design and -. repair

_ package 1(attached) associated with the repair of a crack-lixe

. indication in the weld of the Reactor WaterLCleanup System (RWCU) piping. _Your approval is requested by March'28, 1991-such that Peach Bottom-Atomic Power Station, Unit 2 can1 return to operation from its current outage.

_ Generic Letter-88-01 provides thelNRC position on 1

intergranular. stress. corrosion cracking (IGSCC) in BWR austenitic 1

stainless stoel piping.

As' stated-in the " Staff Position on-Reporting RequirementsP-of this Generic Letter, "if any cracks:are identified that-dornot meet the criteria for continaed-. operation 1

without evaluation givenin-Section XILof the Code, NRC approval of flaw evaluations'and/or repairs in accordance withJIWB'3640-and IWA 1413011s required =before resumption of operation."

Philadelphia Electric Company is satisfying;this position.via this-letter.

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A crack-like indicationLin the heat affected zone of a L

. weld was found at Peach Bottom Atomic Power Station,_ Unit 2 during

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'the performance of augmented examinations.

These augmented L

Inspections were conducted in accordance.with the. Peach' Bottom

' Atomic Power Station, Units 2 and 3, " Inservice Inspection (TSI) 0v(

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' Program Second: Ten Year Interval" (PECo Specification M-733, Revision 0), AUG-1 examination program.

The indication is locatiMI 9103280256 910321

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PDR ADOCK 05000277

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'U.S.' Nuclear Regulatory Commission March 21, 1991 Page 2 in the four (4) inch Reactor Water Cleanup System return line (from the Regenerative Heat-Exchanger), adjacent to check valve 2-12-62.

.The indication was identified as IGSCC and exceeds the ac; aptance standards of ASME Section XI, Article IWD-3000, 1980 Edition through Winter 1981 Addenda.

A Nonconformance Report (NCR) was originated to address this IGSCC concern.

The disposition of the NCR is to repair the weld using a standard design weld overlay, as allowed by Generic Letter 88-01 and NUREG-0313, Revision 2.

The weld overlay was designed by General Electric for PECo in accordance with the requirements of ASME Section XI.

A final package containing all necessary information concerning completion of the weld repair shall be transmitted by April 5, 1991.

If you have any questions, please do not hesitate to contact us.

Very truly yours, Ca%u/k

/G. J.

Beck, Manager Licensing Section Nuclear Engineering & Services cc:

T. T -. Martin, Administrator, Region I, USNRC J.

J.

Lyash, USNRC Senior Resident Inspector, PB l

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e Ocsign and Repair Package Summary of Attachments

' Veld overlay design provided by General Attachment I s

Electric, transmitted via letter dated March 19, 1991, Rev. 1.

General Electric Specification 1 (P50YP225, Rev. 3) which was used as a guideline by PECo for preparing the Work Instructions as defined in Attachment I.

Attachment III -

Work Instructions (WI-206, Rev. 1) created by PECo for performing the wcld overlay.

Resolution of differences between the Work Instructions and the G.E.

Specification was performed by PECo Engineering.

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l' Narch 19, 1991 To;-

P..A. Tutton (PECO) cc:

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Ranganath-J.P. Clark from:

C.D. Frederickson (CE)

Subject:

Full Structural Overlay Design for RWCU Piping Veld 12 1 1D at PB2 A circumferential.. indication was found at the inner surface of the RWCU

, piping near veld 12 I-1D at Peach Bottom Unit 2 (PB2).

This indication located in_the vicinity of t.he weld (about 0.8 inches from the-weld centerlino) was determined to have a n,imum depth of 0.14 inch and a circumferential length of approximately 2 1,d es.

The affected pipe section H

is-4" ochedulo 80 made of ASTM.A 376 TP 304 stainless steel.

The thicknoss of-the pipe wall-vas measured as 0.40" around the indication.

"A full structural overlay has'been desi ned to repair this section of pipe.

Thel overlay dasign_is shown on Pigure 1.

The full structural weld overlay. has been designed in accordance

-o with Section XI of-.the ASME' code,

'The attached Reference 1-specification.may be used for guidance to o

develop _La site specific-overlay procedure.

Some specific exceptions which may be taken to this specification are outlined below.

The overlay thickness.has been determined as 0.20 -inches. - Local o

regions of the overlay' may -have a minimum. thickness as: low-as 0.175 inches.-

The _ forrite content of each weld pass shall-be measured per paragraph 3.2.3 of Reference 1.

The first weld pass:

-may be included in the total overlay thickness -if the average q

ferrite content is at least 7.5FN.

If, the ferrite ' numt er of the first: weld pass is less than-7.SFN due, to dilution, the overlay thickness must be 0.20 inches in' addition to the' first veld pass-thickness.

The thickness of the first_ weld pass 11s not important-as long as the overlay thickness is_ determined as described above.

L ou The-full structural overlay. design is conservative in;that'the-L cracking:is' assumed to extend through-wall for the full 360' L

circumference of the pipe.

The overlay material.alone is thus l

. designed to be sufficient:to support design loads with a factor of safety of 3'0 to collapse _ consistent with the ASME code.

In actuality, the existing flaw extends less. than 40% through wall for less than 20% of the pipe circumference.

It is also unlikely that this flaw will grow significantly because the heat shk welding overlay procedure creates compressive ::esidual stresses in the pipe which will arrest crack growth.

CDF9108.VP / Rev. 1 1

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Because no credit is being taken for the effect of weld residual stresses in arresting crack growth, the cooling water flow and temperature requirements S ven in section 3.6 of Reference 1 need i

not be strictly enforced.

These values shall serve as a guide

only, o

As sheen in Figure 1, the overlay vidth shall extend at least 1.50 inches past the indication in the direction away from the valve.

At the base of the overlay, the width shall be an additional 0.20 inches.

This vidth is designed both to meet structural requirements and to ensure that UT inspection of the indication is possible after the overlay is completed, o

Weld overlay shrinkage should be measured to provide information only.

Distortion during the veld overlay process does not in: pac t the veld overlay design nor is it addressed in Section XI of the ASME code.

Therefore, the distortion control 6 ven in paragraph 1

3.7.4 of Reference 1 serves ac a guide only and is not inandatory.

This distortion control is on the variation of shrinkage measured at four azimuth locations, not on the absolute value of the shrinkage.

The design records for this overlay are contained in DRF(i137 0010, SASR6 91 26.

If there is any further clarification needed on this design, please contact me.

Sincerely, d/N WAt?Y I'

C.D. Frederickson Senior Engineer, Structural Analysis Services (408) 925 2699 Reference 1:

GE Document () P50YP225, Rev. 3,

' Process Specification for Weld overlay for Auster.itic Stainless Steel piping Welds,"

July 13 1987, CDF9108.VP / Rev. 1 2-

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Peach Bottom Unit 2 RWCU Weld 12-1

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.. ca p 4 GE Peach Rottom Unit 2 RWCU 12 1 1D Tull Structural overlay Design Pipe and Plaw Dirensions:

Piping Leads:

Pape ID:

3.700 (in)

Pressure, p:

1000 (psi) wall Thickness, de 0.400 (in)

Axial Loads:

Deadwetoht, Td 0 (1bs)

Pipe ODs 4.500 (in)

OBE seismic, Tsi 0 (1bs)

Pipe Area, Apa 5.152 (in*2) Moments:

Deadweight, Md 24905 (in.lts)

Pipe Inertia, Ip: 10.929 (in*4) obr seismic, Men 22222 (in.lbs)

1) Assumed Flaw Depth, ai 0.400 (in)

Overlar Dimensions Piping Stressess overlay Thickness, 7 0.175 (in)

Hombrano, Peps 3756 (psi)

Min. Overlay Length, L 1.109 (in)

( Pmp = (p(PI/4)!D*2+Fd*Fe) / Apl

[L.

At on each side of indication)

Bending, Pbps 9702 (psi)

[ Pbp = (Md*Me) 00 / (2 Ip) )

Pipe + Cverley Oirensions:

Pipe overlay Stresses Wa11+0vrly Thickness, to 0.578 (in)

Hombrane, Pmos 2506 (psi)

[t=T+d)

[ Pmo = (p(PI)Ria2+Fd*Fe) / A )

Pipe Inner Radius, Ris 1.8$0 (in)

Bending, Pbot 6363 (psi)

Overlay Outer Radius, Ros 2.425 (in)

[ Pbo = (Hd+He) Ro / 3 )

Heminal Radius, R:

2.138 (in)

Tactor of safety, FCI 3.00 cross sectional Area, Ai 7.722 (in*2) HIN Critical lending Stress:

24101 (psi)

Sending 2nertia, In 17.961 (in*4)

( Pbc > FS (Pmo+Pbo) - Prr.o l Material Properties critical Bending stress calculations Pipe Materials TP 30e 33, ASTM A-376 Neutral Axis Angle, B:

0.6143 (rad)

Overlay Haterial Type 308L ss

( B = P! (1.a/t.Pmo/Sf) / (2-aft) )

Design Stress, $ms 16950 (psi)

Critical Bending stress, Pbei 24339 (psi)

Flow Stress, 8f = 3 Sm:

50850 (pel)

[ Pbc = 2 (Sf/PI) (2.a/t) sins )

critical tending Stress, Ptc =

24339 (psi)

Notes is greater than the Required

1) The pipe is conservatively assumed critical Bending Stress of 24101 (psi) to have a 360 degree through. wall Therefore, the overlay Design crack for this full structural Thickness of T =

0.175 (in) overlay design.

and Length of L =

1.109 (in) is sufficient.

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BUSINil$ OrtitATIONS ATTM_HMGh1T IC

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SCOPE or autoestically This specification defines the requirements f or machine 1.1 deposited weld buildup on the outside diameter of stainless steel pipe at butt weld locations.

These deposits are made using heat sink (pipe water cooling) techniques.

1.2 Definitions. For the purposes of this specification the following definitions shall apply:

Buyer: The procurement activity of the General Electric Company. orFor the subcontractors to General Electric, invoking this specification.

products produced within General Electric canufscturing f acilities which are not processed through procurement organizations, submittsIs to the Bayer ref erenced in this specification shall be directed to the appropriate engineering or quality assurance organizations according to existing policies and practices.

Weld Overlav.- A weld metal buildup on the outside surface of a jiipe or fitting butt weld joint and adjacent base metal for providing additional structural material and' added stress corrosion protection to the existing pipe weld.

Ys11 Thickness-W:11 thickne s s shall be the de sign minimum well thickne ss unle ss otherwise specified.

Restricted Access We h Any weld which anst be performed with secess f or welding in any direction restricted to less than 14 inches.

2.

APPLICABLE DOCMGN73 The_ f ollowing documents form a part of this 2.1 General Electrie Doenmentn spoolfication to the extent specified herein.

2.1.1 Sunnortina Doonment:

None 1

2.2 Codes and Standardim The following documents of the latest issue (or specified specified issue) form a part of this specification to the extent herein.

2.2.1 Ameriesu Society of Mechanical Enaineers ( ASME) Boller and Pressure Vessel Code Scotion II, Material Speelfications n.

Section III, Division 1, Nuclear Power Plant Component s b.

Section V, Nondestructive Examination o.

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Ssetion II. Welding and Brazing Qualific4tionsSection II. Division 1. Enles for Inservice Inspection of Nuclear Power e.

Plant Components 2.2.2 AE.t.r.lenn Weldier Seelety (AFJ) Standardi

- Standard Procedores for Calibrating Xsgne tic Instraments to AWS A4.2 Measure the Delta Ferrite Content of Austenitic Stainless Steel Weld a.

Metal 3.

RB2UIREMENTS 3,1 General Reauirements i

All velds shall be perforned in accordance with-the requirement s of 3.1.1 ASMB Section XI to the extent specified in the document (s) invoking this i

The veld. overlay shall be considered a structursi bulldop and specification.

shall be analyzed and qualified accordingly.

t Application of weld overley to piping velds containing indications f

3.1.1.1 exceeding the acceptance standards of ASXB Section II shall require approval of the Buyer, l

Application of weld overisy to installed piping where longitudinal or 3.1.2 circumf erential shrinka ge could af fect sy stem e ssembly stresse s or adj acent components and fittings shall require approval of the Bayer.

shall be performed using detailed written welding j

3.1.3 All welding j

procedures that contain all applicable essentisi and nonessentis! varlebles All 1

of ASNE Section II and additions 1 requiresents of this specification.

welding and cooling procedures.shall be approved by the Buyer prior to use.

3'.1. 4 Continnons water cooling of the ID pipe surf ace in the vicinity of the

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veld joint and overlay shall be employed during alj welding.

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R340Fik The dimensions of the veld overley shall be in accordance wit j

3.1,$

Figure 1 with the values of W and T being determined by analysis and supplied by th e B uy e r,

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FIGURE 1 WEI.Ii OVERLAY DIXENSIONS m e..r u uv. 4.i.o l

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3.2.1 Rene Material. De base material shall be austenitic stainless steet 1

- ripins or fitting. P8 of ASME Section IX.

Weldine Material. The velding materials shall be Type ER308L stainless 3.2.2 The anziana carbon steel in accordance with ASKE Section Il Part C. SFA 5.9.

content-shall be 0.02 percent.

For all stainless steel velding asterials the average 3. 2. 3 f,gy,ti t o Con t r o l.

shall be a miniana of 8FN (Ferrite Number, FN) with no ferrite ced ont individual reading less than 5FN.

Ferrite content shall be determined on undiluted weld deposits, by magnetic measurements as specified in ASME Either Magna Cage or Ferrite Section III, Division 1 (Winter 1976 or later).

Scope type ins'truments calibrated in accordance with Ak'S A4.2 shall be used.

1.3-Mises11ansons Material Reanfrements ne shielcing gas for velding shall be welding stade 3. 3.1 - Shieldina Gant l

Argon.

3.3.2 -Coolanti - The coolant for production overlay velding shall be -

I domineralized water that meets the following requirements.

Domin. Water Conductivity (naho/cm at 25'C) 3 Waz.

1 ppe mer.

Chloride

{

1 ppa sex.

Sulphide 1 ppe sax, Finoride 5.3 to 8.0 a t 25'c pg 3.4 ' Overlav precarntlen tecnirements De-surf aces to be wold overisyed shall be cleaned to remove grease,

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The ares to be 3.4.1 oil.- slag, spatter, moisture or other deleterious materials.

overleyed shall be examined in scoordance to Paragraph 4.1.1.1 requirements.

3.4.2 Wald Reinforaement for E11atine Weids The crown or reinforcement on exisOns butt welds need 3.4.2.1 Entt Weldsm:

not be removed f or-overley velding.

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3.4.2.2 Lonritudiesi velds.

In the zone to be overinyed, the reinforcemih D -

hcisht on longitudinal seam welds shall not exceed O',062 inch, and shall blend amoothly (maximum of 3:1 slope) into the base metal, j

3.4.3 Treesfer of Yeld Location < ne centsrline and edges of the existing circumf erential butt veld shall be mark 9d ',y a Bayer approved technique f or subsequent location beccath the weld overlay.

Acceptable techniques include i

match marks or slailer ref erence linen adjacent to the weld overlay at a minimum of four equally spaced azimutha around the pipe.

3.4.4 Ultrasonic Thietness Measurement.

When used to verify overlay thick:ess (Paragraph 4.2.2), the referez.co thicknean of the existing weld and base material shall be determined in accordance with ASKE Section V.

Snbsection A, Article 5 requirements.

Ref erence thicbe sa measurements shall be determined at a minimsm of four equally spaced azimuths, and at a minimum of every 0.5 inch over the width of zone to be overinyed. The 0.5 inch spacing positions shall be measured and recorded relative to the reference marks or lines required in Paragraph 3.4.3.

3.4.5 Distortion Centrol.

Suitable reference marks shall be located adjacent to be overlayed f or measuring the longitudinal shrinkage due to to the zone Measurements shall be made at a minimum of four azimoths, overl ay weldina.

and aLall meet Paragraph 3.7.4 requirements at the completion of overlay welding.

3.5 Qcalification Reaultements The velding overlay procedure shall be qualified to ASME 3,$.1 Procedure.

Section 11 criteria for structural welds, with flowing water cooling as an additional essential variable.

Operator performance qualifications shall be in 3.5.2 Performance.

accordance with ASMB Section II criteria.

3.5.3 Moekun Reanirementa A sockup veld overlay shall be perf ormed by the f abricator 3.5.3.1 Gagarab for each velding position (horizontal-fired, vertical-fixed, etc) to be A wockup is also required for 1) a restricted s'ocess veld, 2) pipe to fitting or fittin6 to fitting welds where the angle of the OD surf ace qualified.

(relative to the run of the pipe) on to be overisyed is greater than 305 either side of the veld, and 3) joint secestries or piping system locatione Hockup where the water flow provisions of Paragraph 3.6 cannot be assured.

qualification on any given pipe aise will gas 11ty for other pipe sizes withis the f ol.oving limitations Pies Sire Quallflad

_ Pine Site of Mockno

.>4 to i size of mockup

< 10 inch 2,10 inch 2.10 j

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ATme_3M93T E 3.5.3.2 Weekne Materialsi. Unless otherwise specified, the base and filter 7 o p. q, catorial used in the nookup shall be the saso type sad grade as used in p8 matterial may be substituted for say other P8 production.

However, any caterial.

3.5.3.3 conflanrstion. no mockap configuration shall simulate the prodnetion confisoration as closely a6 practiosi.

As a minians, restricted access, adj acent components, fixturing, and water cooling techniques (where applicable according to Paragraph 3.6) shall be simulated.

3.5.3.4 Y,,gj d i n n.

The sociop shall be velded in accordance with the approved solding procedure with no added precautioes which will not be need in Welding shall be monitored and records of welding parameters, production.

start and stop positions, longitudinal shrinksge, repairs. or any other events af fecting the goality or reprodacibility nf the mockup welds shall be retained.

3.5.3.5 Accentance criteria.

Unless otherwise specified, the following shall constitute cause for rejection of the scokup:

Osmission of, or deviation f rom the specified mockup requirements and a.

Buyer approved description.

Failure to pass examinations specified in Paragraph 4.1.2.

b.

Fa!!ure to maintain l' ngitudinal shrinkage within the limits of Para-o c.

graph 3.7.4.

3.5.3.6 Oeerator Proficiency._ Each velding operator shall demonstrate adequate proficiency on the overlay mockup with all access restrictions, overlay positions, and equipment configurations that simulate production welding in place. Adequate proficiency shall also be demonstrated by each operator for remote monitoring and/or remote control of the process. Acceptable mockup welding proficiency shall be formally documented and' certified by the l

fabricator for each operator.

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3.5.3.7. Alternate Mockun cualification._ For situations requir ng the performance of a mockup by the fabricator according to the requirements of Paragraph 3.5.3.1 a formal, detailed record ofrec l

the mockup. This document shall be submitted ~to the Buyer for and Engineering approval prior to the start of production welding,ience shall contain as a minimum sufficient description of the exper to allow verification that the requirements of Paragraph 3.5.3 were

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met for each situation for which relief from mockup fabrication is requested. When prior experience is sttbmitted for process mockup qualification, the operator profiancy requirements of paragraph 3.5.3.6 shall still apply.

certification of operator proficiency can be based on an operator's recent mockup experience, with Buyer approval obtained prior to l

{ production welding.

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3.6 Yster Cooline Reanirements 3.6.1 General.

De water cooling technique for overley velding shall comply with the requirements of this document. Water flow conditions shall be varified by a mockup or other Buyer approved technique if the production weld is located in a portion of the piping system where the minimum flow velocities of this specification cannot be asscred.

3.6.2 Wster Flow Velocities ne minimum flow velocities shall be as follovst a.

Water Flev Velocity Ploe Tvee Borizontal Pipe Butt Welds. Properly 1.6 Ft/sec Pitched Horizontal Pipe Butt Welds. Unpitched 3.9 Ft/sec Vertical Pipe Bott Yelds 2.6 Ft/sec Pipe to Fitting Butt Welds 3.9 Pt/see 3.9 Ft/see All Other Joints 6

b.

Demonstration of Coversge: (WhenParagraph3.6.2requirementscannot be met).

(1) For velds in special fittings or in locations where the minimum flow voloolty specified in Paragraph 3.6.2.a above cannot be assured. it shall be demonstrated by-use of the sockup, or other buyer approved technique, that-flowing cooling ocotra continuously during velding, around the entire.tD surf ace of the veld root. weld joint counterbore and pipe base metal beneath the veld overlay.

(2) It shall be demonstrated that the minimum water flow rate can be i

usintained during voiding.

Flow rates shall be recorded during velding.

Properly pitched. pipe f or the purposes-of this specification is considered to have a minimum slope of 0.25 inch per i foot of run pipe length, nao sera (nav. ielso

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~3 RUSINESS OPIRATIONS ATTAG44Ed 3.

p 3.6.2 (Continued)

Alternate Techniques - As access permits, special dams, sir tubes or water c,

spargers may be used to provide local water cooling.

Such techniques shall be evaluated in the mockup, and approved by the Buyer prior to use.

d.

Flow velocitie s le ss than specified in Paragraph 3.6.2.a above shall be g

approved by Buyer prior to use.

3.6.3 Hiscellanecos Water Cooline Reantrementa:

a.

The maximum inlet temperature of the water shall be 120'F.

'l b.

Welding shall not be initiated on wet surfscos.

3,7 General Weldine Reanfrements 3.7.1 The veld overlay shall be deposited using mechanized pipe woldtus equipment that controls welding current and voltage. wire feed speed and travel speed a s a minimum.

3.7.2 Individual veld layers of the buildup shall consist of a row of circumf erentially-deposited weld pa s se s.

Each weld layer shall be comple ted for its entire length along the pipe prior to depositing the next layer.

except that passes may be added to the ends of the overlay as required to meet minimum slope or veld overlay tie-in requiremente.

3.7.3 The maximum interpass temperature for all velding shall be 350'F (177'C).

Distortion Control. n o weld stop and start positions, and if 3.7.4 necessary, the weld rotational direction shall be sequenced to provide uniform

. longitudinal abrinkage of the pipe assembly.

Longitudinal shrinkage shall be considered uniform if held within 0.02 Y (Figure 1), or 0.032 inches.

whichever le greater, when semanred at the completion of overlay welding at a

minimes four equally spaced azimuth locations.

This lisit obs11 be appiled to all mockup and production weld overlays.

3.8 Renair Reanirements 3.8.1 Repair of weld-overlay buildups shall be performed with the re strictions listed below.

If pipe size and pipe thickness criteria conflict.

then pipe thickness shall determine the repair requirements appilcable.

In pipe sizes less than 10 inches. or,for pipe design wall thickness less a.

than 0.625 inch!

shall be one (1) no weld repair, !! deeper than the layer in progress, or more in11 circumf erential passes, including cironsf erential preparation a s necessary by O *nding or machining. Buyer approval is l

required for veld repairs which extend into the base metal.

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10 GEN ER AL $ ELECTRIC P30 m 25 sm wucuAntwinov r"6

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Rev 3 BUSINEs$ 0?titATIONS ATTAC M194T '.1L 1

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3.8.1,a (Continued)

W (2) The weld repair, if in the layer in progress, shall be blend ground f or velding as neces sary.

The veld repair shall be one or more circumferential passes extending a minimum circumferentisi distance of five (5) inches, b.

In pipe sizes 10 inches and larger, or f or pipe wall thichne ss greater than or equal to 0.625 inchi (1) The veld repair shall be blend ground or machined prior to welding a s necessary.

The weld repair shall be one or more circumf erential passes and shall extend a minimum circumferential distance of five inche s f or each 0.12 inch in depth, but not less than five inche s.

Buyer approval is required for veld repairs which extend into the original veld or pipe base material.

3.8.2 Grinding (not requiring local weld fill) is acceptable, providing the requirement s of Paragraph 3.9 are mot.

3.8.3 All veld repairs of weld overlays shall be performed using qualilled procedures with ID cooling por this specification and approval of the Buyer prior to use.

3,9 overlav Finishina Reanireventa 3.9.1 Weld overlay buildups shall meet the dimensional requirements of this specification in the final finished condition.

At the junction of the wold overlay with the base material, the height of reinf orcement or depth of undercutting shall not exceed 0.032 inch.

3.9.2 The transition slope between the pipe and the overlay top surf ace shall be free of overlap or abrupt ridges and valleys greater in any dimension than 0.06 2 inch.

3.9.3 The top surf ace of tha veld overlay shall be prepared for subsequent interrice sitrasonio examination in accordance with the requirements of Figure 2.

Ptt o 407 A (MEV. t e/tt )

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3.9,3 (Continued) a.

General Sarface Finish SURFACE FINI5R 250 MICROINCHEs. OR BETTER ALL TOP SURPACE EXCEPT SLOPED AREAS f

n - _ -

v-b, Local Areas of Underf111 (-r Reinforcement MAXIMUM DEPTH =0,031 INCH,PER INCH OF t.ENGTH 6:1 MINIMUM ' SLOPE ALL AROUND E ---

MAXIMUM HEIGHT 0.062 N

9 c.

Surface Flatness' MAXIMUM CONVEXITY OVER WIDTH =.025W (WHERE W = WIOTH PER FIGURE 1) l~

I!

] HAXINVH CONCAVITY OVER WIDTH 0.025W l

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Minimum overisy thickness per Figure i nest still be saintained.

FIGURE 2 DVERLAY SURFACE RBQUIREMENTS Neo nota (s,ey,se/sig

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QUALITI ASSUltANCE REQUIREMENTS

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4.1 Eramination

. l 4.1.1 Nondestructive Examication of Production Feld Overlays 4.1.1.1 Prior to applica tion of the weld overlay, the ba se me tal, weld surf aces and adjacent base metal for 0.5 inoh on either side of the edge of the area to be built up shall be liquid penetrant examined in scoordance with ASXE Section III, NB5000.

4.1.1.2 The surf ace of the first layer and of the final weld overlay plus adjacent 0.5 inch of the base metal shall be liquid penetrant examined in accordance with NB5000.

4.1.1.3 The final weld overlay shall be volumetrically examined by radiographic - technique s according to NB5000.

Al t e rna t e ly, ultrasonio czamination according to NB5000 may be used.

3 4.1.1.4 For all welde subjected to inservice inspection provision of ASMB Section I.I, a new baseline examination shall be performsd for the existins butt weld.

A ba seline-examination shall also be perf ormed for the weld overlay buildup, except that the width of the area to be examined need only be y as defined on Figure 1.

The overlay shall be included in the required ultrasonic calibration standards.

De finished weld overlay shall be examined for unif ormity of longitudinal abrinkage according to Paragraph 3.7.4 requirements.

4.1.2 Eramination of Wold Hockuo, As a minimum, the examinations required for the production welds shall be required for the mockup.

In addition, a radiographic examination shall be performed in accordance with the ASME Code,Section III, NB5000.

Nockup welds which do not meet the acceptance criteria of Subsection NB5220 shall be rejected.

4.2 Overlav Thickness Examination 4.2.1 De finished weld overlay, shall be examined per Paragraph 4.2.2 or 4.2.3 to determine that minimum thickness requirement s of this

{

specification have been met.

4.2.2 "Ultrasonio Thickmens Determination ne overlay thickness shall be determined by measuring the final 4.2.2.1 thickness. of overlay, the thickness of the first layer of the overlay and the j

underlying pips / pipe weld in accordance with ASMR Section V, Subsection A, Ar ticle 5 requirement s, no overlay thicknees shall be the dif f erence between the total thickne ss measurement and the ref erence thickness (Paragraph 3.4.4) minus the thickness of the first overlay layer.

Measurements shall be taken at a minimum of font equally paced asianths, and at a minimust of 1.0 inch ovar the width (W) of the overlay.

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<m GENER AL @ ELECTRIC 13 n mas so.

NUCtEAR ENERev A

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IUSINEss OPERATIONS AYKAkWT E 4.2.2.2 U1erssonic Thiciness Criteri q he overlay shall mee t the e n en thickness defined in Paragraph 3.1.5.

The thickness of the designed overlay should be at least two layers of weld metal after the surface has passed surface examination by penetrant inspection (PT).

If credit is taken for the thickness of the first layer, it must be shown by actual test to contain a minimum of 8% ferrite, and the original surface must have passed PT.'

4.1.3 Altereste Dimenstocal Thickness Measurement 4.2.3.1 As an alterns te to Paragraph 4.2.2, dimensicas! mea surements may be taken at the ends of the weld overlay at a minimum of four equally spaced stimuths to determine the finished overlay thickness.

4.2.3.2 Dimension Thickness Criteris (Minimum),

ne minimcm ove rlay thickness for dimensional measurement ersmination shall be the sum of:

The minimum of Paragraph 3.1,5 a.

b., The measured conesvity in the veld overlay for the correspondins azimuth.

4.2.3.3 Deleted 4.3 Meterist_Centrol.

All welding filler l

shall be controlled identified, and traceable to the Certified ma t e ri al s Materiala Test Reports required by ASME Code.

4.4 Ove rl ay Fe rri t e Me umagit 4.4.1 Delta f errite mea surements shall be in accordance with Parasreph 4.4.1.1 f or each weld overlay layer.

Measurements shall be evaluated assinst the acceptance criteria of Paragraph 4.4.2.

4.4.1.1 Measurement procedures are as follows:

Magna Gage or Ferrite Scope instruments, per A'fS A4.2, shall ' c used c

i a.

l k

for all measurements.

b.

Messurements shall be taken at font squally spaced azimuths around the joint on the as-deposited weld surf ace.

(Grinding or finishing of the surf ace shall not be perf ormed prior to ferrite measurement s. )

Measurements at each azimuth shall be taken at the approximate weld center and edge of the. weld crown in the overlay layer. When using c.

double tip probes, measurements shall be taken as pairs with the probe:

rotated 90' between individual readinas.

I 4.4.2 Ferrite acceptance criteria are the following:

a.

Averase 8FN minimum b.

No individual reading less then dFN i

0

GENER AL $ ELECTRIC NUCLRAR INEROY rsur:25 3x 14 IUllHR$5 OPERATION $

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'SUDWIITALS AND RECORDS p l( of IS

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$.1 The following procedures shall be submitted to the Doyer for approval prior to use.

5.1.1 Hociuo Description _ned Procedure 5.1.2 weldles Procedures 5.1.2.1 For veld overlay buildup.

5.1.2.2 For repair welding.

5.1.3 Water coolins Procedores 3.1.4 Nor. destructive Examination Procedures u.

Liquid Pene trant Examination b.

Radiographio Examina tion c.

Ultrasonic Examina tion 5.1.5 Dimensional Checkinz Procedures 5.2 The following information shall be recordsd during the course of work, and submitted to the Buyer as a fabrication data package.

5.2.1 Detailed records of each repair made af ter the overlay was coupleted, including location, size of cavity, probable cause, and repair technique.

5.2.2 Dimensional or ultrasonic thickness test results and longitudinal distortion meaanrements.

5.2.3 Nonde structive examination resni ts.

Mao set A (nev, safen)

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  • NC4 06, Rev. 1-#P91714,(option f3) pm / g 4 WI-2 MRF 49101668-DATE 03/21/91

SUBJECT:

' Work instructions for veld overlay to be performed on Reactor Water-Clean-Up Weld #12-I-1D.

- PBAPS, Unit No. 2 I.

Clean syrfaces to be overlayed to remove grease, oil, s149, moisture, etc.

Job Leader /SuF i-8.

In order to document the-longitudinal shrinkage due to welding, take initial reference measuring points (scribe lines) at four equally spaced azimuths ( 0, 90, 180, 270 degrees)_on each side of the weld overlay area using e calibrated tool..: Document the distance between each two

corresponding measuring points:-

-Calibrated Tool I.D.-#

0 degree points!

90-degree points 180-4egree points 270'(egree points Job Leader /Supv i

3e NDE Ser ices to-perform P.T. and U.T. thickness exam-

-ination of pipe surface to be overlayed. As a minimum, a 6" wite' band (360 degrees) shall be P.T. examined..

Documeny.results by including NDE report-Within MRF-packagej Acceptance criteria-for_P.T. exam shall be-Paragraph NB-5000 of'ASME'Section III, 7980 Edition withadpendathruWinter1981,by.

U.T.. Th;,ckness measurements shall-be taken as follows:

-A B-C D

E 0 degree points 90-degree: points 180-. degree points

~

'270~-. degree points Notes:

l',= Reference-points A, B, and'C shall be equally

_NDE Services

, spaced across the width of weld overlay I

L WI-206, Rev. 1 l

l R

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ArtAcuerasr TH.

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4 ~. 3 Verify with operations that water flow.through the pip han been. established.-Water flow shall be

maintalped throughout entire welding process.

Job Leader /SupV Beginwhldingoverlay.as_perattachedWIDsheet 5 ~. -

Land NCR P91214.-

16.1 Upon completion of first weld layer, Metallurgy Lab Technician to perform _ ferrite. content examination on the:first weld layer using a Magna Gage or~ Ferrite

ScopeJ(or equivalent). Acceptable ferrite content
shall be(7.5FH (ferrhte number) or-greater.
Measured. Ferrite Number =

1 a

Note:

If ferrite number is less than 7.5FN, then i

credit will not be taken for thickness of i

first' weld layer. Measurements taken in I

step 8 shall,then-be: considered as baseline.

Met Lab Tech.

L (7.: : Prepare' surface'for-P.Tc and U.T. thickness exam-

.inationa.-

Job Leader /Supv

. 8 ~.

NDE ServicesLto. perform P.T.-and:U.T. thickness

=i examina41ons:of the first> weld overlay layer.

'Acceptancp crive la for P.T. exam shall be Paragrash NS-5000~of ASME Section III, 1980' Edition

with addenda thru Winter 1981,.by-U.T.oTh:.ckness measurements shall be-taken asTfollowsi

'A B'

C D

E

O deggee points-90.degyee points-l E
180! degree points' l270:deg{ekpaints-I Notes:L'

'1.jReference points A, B,.and C shall be.cqually

]

4spacedacrossthe.widthofweldoverlay NDE Services

j

'9 = TApplyLeecond' layer ~cf weld overlay,1 staying ~within L

guidelines _as specified on attached WID sheet and NCR P91214

,e f:

WI-206, Rev. 1 P

1

A77bcknwr EE PAcur 3 of c, 10.

Upo..n~ completion of second weld layer, Metallurgy Lab Technic $an to perform ferrite content examination on the second weld layer using a Magna Gage or Ferrite

' Scope (or equivalent). Acceptable ferrite content shall b9 an avera e of 8FN (ferrite number) or greater with no ndividual number less than SPN.

MyasuredFerriteNumber=

Met Lab Tech.

11 Prepare' surface for U.T. thickness examinations (information only).

Note: Job Leader to confer with Maint. Eng. to determine if steps 11 and 12 may be deleted.

If U.T. measuements are not rTquired, then N/A steps 11 and 12.

, Job Leader /Supv 12.

HDE Services to perform U.T. thickness examination of the pecond weld overlay layer.

U.T. Thickness measurements shall be taken as follows:

}

A B

C D

E 5

O degree points 90 degree points 180 degree points 270 degree points Notes:

lj Reference points A, B,

and c shall be equally j spaced across the width of weld overlay NDd Services

~

13.

Apply third layer of weld overlay, staying within guidelines as specified-on attached WID sheet and NCR P91214.

14.

Upon'cohpletionofthirdweldlayer,MetallurgyLab k

Technician to perform ferrite content examination on the thlyd weld. layer using a Magna Gage or Ferrite Scope (or equivalent). Acceptable ferrite content shall by an average of 8FN (ferrite number) or with no individual number less than SFN.

greater e Measured Ferrite Number =

Met Lab Tech.

f WI-206, Rev. I l

l I

87DkWMWr TE juu 4 or c 15.

Prepare, surface for U.T. thickness examinations

.(information only).

Note: Job Leader to confer with Maint. Eng. to determine if steps 15 and 16 may be deleted.

If U.T. measuremonts are not required, then N/A steps 15 and 16.

Dob Leader /Supv 16 NDE Services to perform U.T. thickness examination of the third weld overlay layer.

U.T. Th(ckness measurements shall be taken as follows:

A B

C D

E 0 dagiee points 90 degree points 180 degfee points 270 degree points Notes:

1, Reference points A, B, and C shall be equally spaced across the width of weld overlay NDE Services 17.

If the third weld overlay layer is considered the final pass, then N/A steps 18 through 20. Prepare surfaco for final N E examinations and contour measurements per GE requirements in NCR P91214 to be performed in steps 21, 22, and '26.

I 180 Apply fpurth layer of weld overlay (if required) staying within Quidelines as specified on attached WID sheets.

19.

Upon completion of fourth weld layer, Metallurgy Lab Technician to perform ferrite content examination on the fourth weld layer using a Magna Gage or Ferrite Scope (or equivalent. Acceptable ferrite content shall be an average o)f 8FN (ferrite number) or greater, with no individual number less than SFN.

Measured Ferrite Number = _

Met Lab Tech.'-

200 Prepare; measurements per GE requiremonts in surface for final NDE examinations and contour; NCR E91?l4.

Job Leader /Supv 1

WI-206, Rev. 1 i

0

Arixminr.7]Z Take'cobtourmeasurementsoffinalpreparedsurface psce s u c, 21

~

.beforehhefinalP.T. examination.Verifycontourat four equally spaced quadrant readings are per NCR P91214 and record on attached data sheet.

Maintenance Eng l

l 22 NDE Services to perform P.T. examination of final overlay', surface. Document results by including NDE report ylthin KRF package. Acceptance criteria for P.T. exam shall be Paragraph NB-5000 of ASME Section:III, 1980 Edition with addenda thru Winter 1981 NDE Services 23.

NDE Sorylces to perform U.T. thickness examination of the fourth weld overlay layer.

U.T. Th;.ekness measurements shall be taken as follows:

A B

C D

E 0 degnee points 90 deauee points 180 deg(ee points

~

270 degree points Notes: 2 lj Reference points A, B, and C chall be equally

spaced across the width of weld overlay NDE Services 24.

Post welding measuring points shall be taken usirc a calibrated tool at four equally spaced azimuths

( 0, 90, 180, 270 degrees on each side of the deld overlay area to determine)the longitudinal shrinkage due to velding. Document the distance between each two corresponding measuring points:

Calibrated Tool I.D. #

0 4egree points 90 degree points 180 degree points 270 degree points IEb Loader /Supv WI-206, Rev. 1 1

Ar7bckarer.7E

~25.

W intenance. Engineering to document the overall

  • M

,. shrinkage' below. Refer to: NCR P91214

  • Final Shrinkage values:

l-Step #3 Step #24 Values minus values O degree points

=

90 degree points

=

180 degree points 270: degree points

~

=

=

26..

Perform final U.T. examination and baseline U.T.

examination in accordance with U.T. procedure C2-UT-103 provided by GECo. The recorded data shall!bp reviewed and evaluated in accordance with Paragraph NB-5330 of ASME Section III, 1980 Edition with addenda thru Winter 1981 and in accordance with Article IWB-3000 of-ASME Section XI, 1980 Edition'with~ addenda thru Winter 1981, by PECO's U.T. Level II".

NDE Services

.I I

.l.

l

.Il WI-206, Rev. 1 l

1 l

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