ML19304C552

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Summary of 412th Meeting of ACRS on 940804-05 Re Proposed GL, Voltage-Based Repair Criteria for Westinghouse SG Tubes
ML19304C552
Person / Time
Issue date: 09/12/1994
From: Kress T
Advisory Committee on Reactor Safeguards
To: Selin I, The Chairman
NRC COMMISSION (OCM)
References
ACRS-R-1572, FACA, NUDOCS 9409300175
Download: ML19304C552 (3)
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WESTINGHOUSE PROPRIETARY CLASS 2C WCAP-14179 NRC/ WESTINGHOUSE STEAM GENERATOR INFORMATIONAL MEETING PRESENTATION MATERIALS R. F. KEATING D. D. MALINOWSKI B. R. NAIR l l SETTEMBER 1994 l l This document is the property of and contains proprietary information owned by Westinghouse Electric Corporation and/or its subcontractors and suppliers. It is transmitted to you in confidence and trust, and you agree to treat this document in strict accordance with the terms and conditions of the agreement under which it was provided to you. l Westinghouse Electric Corporation L Nuclear Technology Division P.O. Box 355 Pittsburgh, Pa. 15230 (c) 1994 Westinghouse Electric Corporation All Rights Reserved l

WESTINGHOUSE PROPRETARY CLASS 2C A tour of the Westinghouse Waltz Mill Site in Madison, Pennsylvania was conducted on Septernber 1,1994 for personnel of the Office of Nuclear Reactor Regulation. The objective of the meeting was to provide information on steam generator tube inspection, repairs, and real hardware and field procedures. The Westinghouse presentation materials provided to the NRC staff during the tour are contained herein. l I

, ESTNGHOUSEPROPRETARYCLASS20 NRC/ Westinghouse SG Informational Meeting September 1,1994 l Final Agenda Tonic Presenter Ilma Welcome V.J. Esposito 8:30 Inspection Probes and Objectives Malinowski 8:45 Bobbin, Cecco, and UT j 1 Probes Analysis of EC data Mockup Demonstration Driggers 9:15 1 ROSA, Probes, inspection Demonstration U bend Mockup Sleeving Description Nair 10:00 Direct Tube Repair Description Nair Laboratory Demonstrations Nair 11:30 Laser Welded Sleeve Samples DTR Working Lunch - Questions and Discussions 12:15 Field Operations Supporting APC Keating 1:00 Tube Expansion Tube Section Removal (VUTEC) In-Situ Leak Testing Wrapup Discussion and Questions All. 1:30 Adjourn 2:00

PGH00SE PROPRETARY CLASS 2C NRC / Westinghouse Informational Meeting September 1,1994 l Steam Generator Tube Inspection Probes and Objectives O _,...-....-_-.-..,m,. -.c--

WE3TINGHOUSE PROPRETARY CLASS 20 l Inspection Probes Eddy Current Probes = - Bobbins: Gtandard, Crosswound, Segmented - Rotating probes: Pancakes, Directional Coils - Array Probes: Cecco,8x1, Profilometry = Ultrasonic Probes - Axial, Circumferential shear; radial - UTEC: Combination of RPC and UT Transducers 9 ~, --w-

WESTINGHOUSE PROPRETARY Cl. ASS 2C Objectives for NDE Probes l = Bobbin Probes = General purpose l - Excellent for detection of undeformed tube i degradation and profile discontinuities l -Insensitive to circumferential cracks - Blinded by dents and profile changes = High speed acquisition (12-24" per/sec), rapid or automatic analysis = Baseline EC signatures l l

, STINGHOUSE PROPRETARY CLASS 2C l Rotating EC Probes =RPC - Surface riding coils (1 or more) - Helical translation - May use pancake or solenoid windings to achieve desired directional preference axial winding for circumferential flaws circumferential winding for axial flaws pancake for general detection - Slow acquisition (0.2"/s), more tedious analysis - Reduces unwanted interference from geometrical discontinuities -Impedance or transmit / receive (Ghent) coils

3-COIL OD 40% 08/27/94 OUTLET UNIT: 1 SG: 11 REEL: 5 SEC WESTINGHOUSE PRO?RIETARY CLASS 20 __E p t _= 1 ~ I E i N e c l b l E mesmE s a !,S ,g a x l ell

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, gTNGHOUSE PROPR!ETARY CLASS 20 '1 Array Probes = Combinations of pancake coils distributed to provide complete coverage with bobbin acquisition speeds = Provides localized probe detection sensitivity = May employ conventional impedance coil or transmit-receive technology = Present options include EC profilometry and Cecco (transmit-receive) probes = Screening probes to limit RPC requirements I I I i -e

\\ WESTINGHOUSE PROPRIETARY CLASS 2C 1 i l 1 Cecco Probe Options C3 i = - Non-contact transmit / receive array probe plus bobbin coil - Optimized for detection of circumferential cracks - Reduced liftoff sensitivity - Conventional differential signal formation l l =C5 - Adjusted to provide approximately equal detection l sensitivity for axial and circumferential cracks = Both probes provide detection sensitivity in tube sections bobbins can't inspect 1 w -4 _____.____________,,___-_-_----------rm----w,-n-,m = - v --,-- e e -r

WESTif4 HOUSE PROPfuf,TARY CLASS 20 Cecco - Bobbin Probe Combined Westinghouse NSD/AECL a, c, e Technology 2 Bracelets of Transmit coils and Receiving Pairs for Complete Coverage i R1 R2 R3 R4 ! eeeeeese R5 R6 R7 R8 eeeeeeee v Sensing Area (16 Total) + High Speed Examination . Can be Used as Full Length Test . Fast Screening for Potential Cracking at Transitions . Conventional Differential Signal Display + 5ensitive to Circumferential and Axial Cracking . Applicable to Sleeve Inspections + Can be Combined with a Standard Bobbin Coil l l L-----.---- -

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5 _ESTINGHOUSE PROPRIETARY Ct. Ass 2C W L Ultrasonic Testing Probes UT is commonly used in conjunction with laser weld sleeve joints to perform weld acceptance tests Historically UT examination was regarded as too slow for SG tube examination -acquisition slower than RPC, much slower than l straight pull bobbins or array probes = UTEC development has matched RPC l speed and faster acquisition rates are feasible - Multiple look UT transducers (3) and RPC on one probe provide enhanced detection, discrimination, and resolution -2 Axis full servo control of probe motion and 360 samples per rotation l l i __.n_,

l l WESTINGHOUSE PROPRIETARY CLASS 2C UTEC' Probe i a, c, e Circumferentially Pancake Aimed Transducer E/C Coil l l i f ? [ \\' l Axially Aimed Radially A!.ned 4 Transducer Transducer A Axially Aimed Transducer p is Sensitive to Circumferential Cracking h O I Circumferentially Aimed Transducer is Sensitive to Axial Cracking Radially Aimed Transducer ( is Sensitive to Thinning, r Pitting and Volumetric IGA l RPC Coil Correlates Ultrasonic data with Eddy Current inspection and Locations. i

) pLSTWGHOUSE PROPR!ET/R(CLAS3 20 l l UTEC Inspection Features = Data station emp oys a high speed processor, high resolution graphics, card mounted acquisition instrumentation, and optical disk storage = Data intensive A-Scan capture and display, C-Scan / B Scan color and amplitude plotting l u Near real time graphics capabilities of all UT i and EC channels 4 l = A-Scan capture allows data analysis after acquisition, including depth analysis t = Combined UT and EC allows precise position and overlay capabilities UT overcomes EC difficulty with magnetic and conductive interferences l -r

WESTWGHoljSE PROPRIETNiY Ct. ASS 2C 1 Data Analysis l = Digital data transmitted over ocal area fiber optics to site ana ysis work stations or l transmitted by T-1 lines to Waltz Mill = Networked computers manned by certified analysts (QDA, Level ll,Ill) used for data analysis performed in duplicate = ANSER analysis software used to faci!! tate display, calibration, mixing, and reporting = Supertubin DBMS performs comparisons of duplicate anaiysis, contemporaneous reporting, graphical and statistical summaries = ANSER ON-LINE DATABASE and TASK MANAGER development near completion will greatly improve all aspects of data processing

MSTNGHOUSE i'ROPRIETARY CLASS 20 Formulation ofInspection Plans Reg. Guide 1.83 specifies minimal sample size and provides advice for testing steam generator tubes in zones e indicated by pertinent industry experience and prior inspection results. J Westinghouse has promoted broader inspection scope, full length probing, diverse sensor application, redundant analyses, and diagnostic analysis: Scope to provide for detection of phenomena rationally expected. Degradation modes are not limited to inlet portions of tubes. Not all locations are adequately evaluated with production bobbin probes. m..un e-------

_ESTNGHOUSE PROPRIETARY CLASS 20 W Inspection Probes Specification Each steam generator to be inspected is first probed with general purpose sensor, e.g. bobbin EC probe. All straight lengths and tubing bends over full length for requisite number of tubes as specified in the l Technical Specifications. l l Portions of tubes not adequately inspected with general l purpose probes are inspected with other appropriate probes:

  • Expansion zones may be inspected with rotating pancake coil (RPC) probes or other qualified technique-(e.g. send / receive EC probes, UT) l population selection may be based on related service experience and pertinent technical l

considerations t

  • Small Radius U-bends (Rows 1,2) may require RPC probes or other qualified technique.
  • Dents and other strong interference sources which obscure bobbin flaw responses should be sampled with alternate probes qualified for such conditions.

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plN3 HOUSE PROPRIETARV CLASS 00 Qualification of NDE Techniques EC techniques for steam generator tubes have been qualified to meet ASME Code Appendir.11 requirements. Probe performance with ASME tubing standards. l Validation of detectability in simulated configurations, e.g. dents in support plates, I l expansion transitions, U-bends l l l EPRI Appendix H performance demonstration attempts to l verify qualification of NDE techniques by recourse to l available pulled tube database and by providing statistical l l basis for new techniques. l Westinghouse is formulating its program to establish Appendix H qualification for its inspection systems. P DD600ne es3199

i ESTWGHOUSE PROPRIETARY CLASS 2C l Qualification of EC Analysts i ASNT and Code requirements for analyst qualification i establish minimum competency. i Pulled tube results and analysis history have demonstrated a need for continual analyst updating to develop highly i skilled practitioners. { Signal-to-noise criteria and signal degeneracy contribute to the prevalent modes of analysis dimculty. Signal to Noise: Identification of Gaw signal usually made but reporting criteria relating S/N to evaluation of the potential Haw may cau.se inappropriate signal classification... l Signal Degeneracy: The tendency of Haw signals to l combine with interference signals causes behavior atypical of the simulatt 3 Gaws used as the basis for analyst training. DDec.14 enatet

pGHOUSE PRO *RIETARY CLASS 2C Qualification of EC Analysts l Institution of conservative reporting criteria have reduced the potential for missed calls. Update of analysis I guidelines spreads new intuition to practicing analysts. The practice of rotating pancake coil probe confirmation of potential bobbin indications permits application of conservative bobbin reporting criteria with reduced unnecessary tube repairs. Appendix G to the EPRI Steam Generator Inspection Guidelines represents an attempt to institutionalize the process of continuing education by using an industry common database to promote universally higher experience after basic qualification via performance demonstration. Westinghouse is cooperating with this industry effort to implement Appendix G for our analyst corps. 1 DDh00149313

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1 i Tubesheet Sleeve a, c, e r N,# itiermany Treased ! moy 690 saceve A 1 4.0-(100 mm) [uppet== nye.*c Wood i 1 1 Orpensson 8 nog \\ en o" 3 W j L O i /v M V o 5 i \\ 4 0* (100 rnrn) ( U i Hydraube ( N p; j O 6 Fgwehn Regios. ( M T G =.,... 1 i ga Hard Ro8ed j Regaon l< 1 I ' +a, } 'Q l l sta== tas wona 8 815 D39363 000 l i Westinghouse Proprietary

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i State-of-the-Art Laser Welding Technology is Superior to Conventional Processes 1 l

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- Less tube distortion M - Less weld shrinkage gi - Smaller heat affected zone Cm

  • More tolerant of field conditions than conventional methods E!

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I l Laser Welded Sleeve Joint Design Maximizes Weld Integrity and Inspectability 1 I

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- Hydraulic expansion of ends to 0.003" maximum tube deformation - 4 g . - Partial penetration groove weld 0.015" minimum width at interface - 85 percent maximum tube penetration ll 3i

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'jj - Upper joint identical to support plate sleeve g; - Lower joint hydraulically expanded and hard rolled to El 4-6 percent sleeve wall thinning - Partial penetration seal weld in clad zone eam 224 D39I22.006 t

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Our Current Laser Welded Sleeving Capabilities include 1 Both Westinghouse and CE Steam Generators l - Qualified processes and tooling systems for 7/8 inch j and 3/4 inch tubing ,5 Generic LWS licensing reports for Westinghouse g Models 44,51, D, E, F and CE generators i a 9m a @ I.vy." _ ^ y 41681 A. 6

l l LASER WELDED SLEEVING HAS BEEN IMPLEMENTED SUCCESSFULLY IN FOUR CAMPAIGNS t O ABOUT 650 TUBESHEET SLEEVES AND TUBE SUPPORT PLATE SLEEVES INSTALLED AND OPERATING FLAWLESSLY SINCE APRIL l 1992 igl 0 TUBE SUPPORT PLATE SLEEVES INSTALLED UPTO THE SIXTH I SUPPORT PLATE INTERSECTION g l 0 WELD ACCEPTANCE SUCCESS RATES BETWEEN 97 TO 100 PERCENT $l 0 SLEEVED TUBE RECOVERY SUCCESS RATE FROM 86 PERCENT THE h FIRST TIME TO 100 PERCENT DURING LAST CAMPAIGN E! =: 0 REPAIR WELDS IMPLEMENTED IN THREE CAMPAIGNS Ml i Westinghouse Proprietary [

WE ARE CURRENTLY COMPLETING THE LARGEST SLEEVING CAMPAIGN IN THE HISTORY OF THE INDUSTRY AT DOEL-4 0 11,425 ELEVATED TUBESHEET SLEEVES (12 INCH) INSTALLED 100 PERCENT UT INSPECTED 98.5 PERCENT WELD ACCEPTANCE RATE '{ 0 150 FULL LENGTH TUBESHEET SLEEVES (30 INCH) INSTALLED 100 PERCENT UT INSPECTED E 99.3 PERCENT WELD ACCEPTANCE RATE R 'l l E i O 1616 HEJ SLEEVES (36 INCH) LASER WELD REPAIRED { I 100 PERCENT UT INSPECTION IN PROGRESS l APPROX. 70 PERCENT WELD ACCEPTANCE RATE O TUBESHEET COVERAGE OF 97.3 PERCENT stsv-cane.wer

SEVERAL NEW PROCESSES,

SYSTEMS, AND TOOLING WERE DEVELOPED TO A VERY CHALLENGING SCHEDULE 0

3/4 INCH LWS WELD HEADS AND WELDING PROCESS 0 36 INCH HEJ SLEEVE WELD REPAIR PROCESS 0 VACUUM DRYING SYSTEM 0 FLEXIBLE ELEVATED HARD ROLL SYSTEM R D OSCILLATING, MULTI-PROBE HEAT TREATMENT SYSTEM O CECCO-3/ BOBBIN EC INSPECTION SYSTEM !n! ALL OF THESE PERFORMED IN OUTSTANDING FASHION AT DOEL 1 O l 1

i l ^ Laser Welded Sleeving Provides Utilities with a Proven State-of-the-Art Process for Extending Steam Generator Life i Addresses PWSCC and ODSCC degradation Addresses degradation in tube sheet and tube fl support plate regions High quality zero leakage joints R 2 Tolerant of field variations in sleeve / tube fitup 9 Fully inspectable by UT l$l Gradual hydaulic expansion process limits parent tube distortion l Provides repair capability i ^:: ^ +== r.;:-,

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STINGHOUSE PROPRIETARY CLASS 3C ] l Axial and ,5 Circumferential [f))( ( Degradation Degraded {f R glon 1 [ a) Degraded Tube ,g,.en - i m.,,, p i f,.q-c j-3 " u k,r-l J l Laser DTR Region Original t - n Degraded f h'ii I (Partially Completed) Reglon %, P s Laser Beam i i b) DTR in Progress Westinghouse Propnetary

8 Primary Objective of Development Program is to Develop Tube Repair Process that Extends Steam Generator Life Restore tubes to a condition that permits continued t service Licensable under NRC approval rules { 3 More economical than sleeving a; 1 E i h i n S l r ^ g- -- Propneasy 41530.5 l e 2

Current Remedial Actions to Address Steam Generator Tube Wall Degradation Have inherent Drawbacks

  • Plugging removes tube from service ig l

- Loss of heat transfer area s li - Reduction in flow rate I e Sleeving reduces flow rate l 5 - Unable to repair above an installed sleeve 5 - In-service inspection difficult because of double-wall configuration Westinghouse Proprietary 323 D39103 003

I DTR Process Offers Many Advantages Over Sleeving l

  • Negligible impact on steam generator performance E
  • Versatile repair process for:

i a - Areas above existing sleeves and dented tubos E - Axial and circumferential indications j "s - Primary or secondary side indications E i o

  • Enhanced inspectability l

Wesianghouse Proprotary 233 D39103 005 i

I i DTR Process Offers Many Advantages i Over Sleeving h e improved productivity with fewer operational steps l

  • Peripheral access not an issue I!

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  • Less radwaste ii

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  • Lower radiation exposure 5

i s e More economical 8 i 8 l i L i Westeghouse Propretary i 233 039 t03 006

i Design Objectives Have Been Established for the DTR Process Repair capability 7/8 in. and 3/4 in. tubing 60% to 86% tube wall penetration g s 1-1/2 in. axial length e l ta i Environment g Compatible with non-cleaned tubes f! y$ Tolerant of stress. corrosion cracking Unaffected by secondary side conditions Inspection compatible with eddy current and ultrasonic techniques- =. c. e Tooling compatible with laser welded sleeving system i eam 41530.6 _j

l Design Objectives Have Been Established for the DTR Process (Continued) Repair process applicable to all regions in the straight section of tubing - Free span g j - Support plate intersections l l - Roll trhnsition regions l 5 O: S l W Propr W 41530.7 l

+ Key DTR Technical and Licensing Issues Robustness of weld process Mechanical and corrosion properties of repair on degraded I samples g Impact on residual partial depth cracks on mechanical properties, including crack propagation g Effect of stress relief on corrosion life i = i Inspectability of repair Field implementation tooling and processes x Securing a utility sponsor for the first-time field implementation NRC interactions l l N Pr W 41530.8

l l OUR INITIAL FOCUS WAS ON A] INGLE PASS AUTOGENOUS PROCESS r O GOOD PENETRATION CONTROL, INSPECTABLE-WELD SURFACE l 0 MICRO-CRACKING.WITH HEATS OF ALLOY S00 TUBING HAVING SULFUR CONTENT HIGHER THAN 0.004 PERCENO .d.c g j i 0 ODSCC PERFORMANCE LESS THAN EXPECTED gl g i U E n i suva. -

I TWO LIMITED FIELD DEMONSTRATIONS OF.THE DTR PROCESS WERE COMPLETED IN 1993 O BEAVER VALLEY UNIT 1 IN APRIL Ih 0 FARLEY UNIT 2 IN NOVEMBER j l 8 i e 3 O4 0 a E i SLEVGW.WPF WE m e (MBE N N TMr

1 i Scope of Beaver Valley DTR Demonstration t Tube cleaning UTEC (RPC + UT) examination g j DTR at two S/P intersections in one tube l m Bobbin EC + UTEC examination j Stress relief of DTR weld l e l Tube removal E Plugging i Channel head closeout 1 I v l

RESULTS FROM THE BEAVER VALLEY DEMONSTRATION WERE POSITIVE O INSIGNIFICANT TUBE DISTORTION O PERFECT LOCATION OF WELDS 0 CRACK-FREE WELDS e O PENETRATION RANGE 30% TO 60% g 0 EXCELLENT TENSILE TEST RESULTS 5 BARE TUBE: 67 KSI YIELD E l DTR WELD: 64 KSI YIELD E g; O WELD SURFACE REQUIRES IMPROVEMENT M i O ACCELERATED OD CAUSTIC CORROSION TEST ON ONE WELD l TERMINATED AFTER EQUIVALENT OF ONE OPERATING CYCLE I WITHOUT LEAKAGE i 0 OVERALL RESULTS CONFIRMED CORRELATION OF LAB AND FIELD DATA {

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l l FARLEY DEMONSTRATION WAS SIMILAR IN SCOPE TO THE i BEAVER VALLEY PROGRAM i i a,b,c 0 WELDS WERE CRACK-FREE O WELD PENETRATION CONTROL EXCEEDED DESIGN OBJECTIVE gl 0 WELD SURFAC'E FINISH WAS CONDUCIVE TO UT AND EC 5 INSPECTION $i 0 ELECTRICAL NOISE PROBLEMS DURING ONE WELD IMPLEMENTATION CAUSED BLOL! HOLES IN A SMALL PORTION OF 5 i 4 WELD LENGTH E j g O LASER SYSTEM HARDENED TO ELIMINATE THIS PROBLEM E "l i i R 4

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GOOD PENETRATION CONTROL i } O GOOD SURFACE FINISH g s E $ll O EXCESSIVE AXIAL WELD SHRINKAGE LIMITED POTENTIAL NUMBER OF 8 APPLICATIONS IN A SINGLE TUBE 3 5 k o i l

1 l OUR CURRENT FOCUS IS ON A FILLER-BASED PROCESS I C PRELIMINARY RESULTS WITH I-690, EN-72, AND EN-82 INSERTS HAVE YIELDED GOOD RESULTS l 60 PERCENT PENETRATION INTO TUBE WALL 1 i 0.020 INCH THICK INSERT 'l O CORROSION TEST SPECIMENS IN PROGRESS $jl O INSERT DELIVERY METHODS BEING EVALUATED m 0 LARGE-SCALE DTR DEMO IN RETIRED S/G PLANNED BY YEAR-END 5i ii! O LICENSING REPORT COMPLETION BY YEAR-END j EN 1 1 l SLEV-CAMP.WPF WESTNGHotAEFROMETART i O

i WEF,TINGHOUSE PROPRIETARY CLASS 2C _b NRC / Westinghouse S/G Information Meeting W Waltz Mill Site September 1,1994 Field Options Supporting APC E Tube Expansion at TSP's & Tube Section Removal (VUTEC) E in Situ Leak Testing R. F. Keating SG Technology & Engineering Nuclear Services Division NRC_0901,OVH September 1,1994

WESTINGHOUSE PROPRIETARY CLASS 2'J Tube Expansion at TSP's I e issue - TSP Movement During SLB O Expose Tube Degradation at TSP's O Increase Potential for Leakage O Increase Potential for Burst l l 9 Solution - Anchor TSP's O Stayrods Prevent Motion at Selected Locations O Additional Stayrods would Resolve issue O Convert Plugged Tubes to Pseudo-Stayrods O Maintain Leak Rate at Near Normal Operating Level NRC 0901.OVH Expansion - 1 September 1,1994

ESTINGHOUSE PROPRIETARY CLASS 2C Tube Expansion at TSP's e Conversion of Tubes to Stayrods O Expand Tube at TSP to Restrict Motion a Single Expansion for Uni-direction Restraint a Double Expansion for Bi-direction Restraint O Position Using ECT Bobbin Probe a Offset Method a Internal Probe Method a ~ 1/32" Accuracy Achievable to Centerline e Expansion Process O Hydraulic Using Internal Bladder O Computer Controlled Expansion Pressure a Time Controlled Following Detection of Yield O Expansion Pressure ~ 10,000 psi to 12,000 psi O Diametral Expansion a ~ 60 to 80 mils Relative to Hole Diameter a - 100 mils Maximum Relative to Tube OD NRC_0901.OVH Expansion - 2 Septenh 1,1994 I

WESMCdiOUSE PROPRtETARY CLASS 20 Tube Expansion at TSP's e Axial Restraint Required 1, b, C O Suppression of First Five Mode Shapes O Maximum Load Imparted During SLB ~ 1600 lb, O Maximum Load Decreases if Energy Absorbed e Axial Restraint Provided By Tube - Test Results 1, d, c O For 3/4" Diameter Tubes in Smooth Bore Holes a Expansions Centered within 1/8" Force - 1000 lb, for 0.1" Motion a Force - 1750 lb, for 0.2" Motion a O Stiffer for 7/8" Diameter Tubes O Expected to be Stiffer for TSP Holes O Slippage at Joint Dissipates Energy O Stiffness Doubled with Internal Sleeve NRC_0901,OVH Expansion - 3 September 1,1994

Tube Expansion at TSP's e Reliability of E.xpand.ed Tubes a, b, c O Risk of Burst During Expansion is Negligible O Maximum Hoop Strain ~ 11% to 13% a Less Than Other Applications Resolved by Plugging O Minimal Corrosion Concerns a SCC Rates at 550*F ~ 14% of Rates at 620*F Hydraulic Expansion Benign Relative to Other e Processes, e.g., Rolling or Kinetic l l i 1 unc_osoi.ovs Expansion - 4 s ept. m b, i, ie u

M.STNGHOUSE PROPRIETARY CLASS 2C Tube Expansion at TSP's e Benefits a, b, c O Minimum Burst Pressure ~ 2.5 Times SLB Pressure a For Displacement of 0.2" a Obviate Need to Consider Burst Pressure as a Function of Bobbin Amplitude O Reduced Potential for Leakage a 'Jsed in Conjunction with in Situ Leak Testing sac _osoi.ovs Expansion - 5 sept.mber 1 m4 l

WESTINGHOUSE PROPRIETARY CLASS 20 \\ VUTEC e issue - Tube Removal is Exposure & Expense Intensive O Several Feet Removed to Obtain Small Area of In'terest a Removals Not Always Successful i O Issues With Remaining Remnant u Expansion into TSP e Stabilization O Time Consuming e Solution - Remove Only Tube Region of Interest O VUTEC - Attemative to Tube Pulls e ALARA l i a Quick & Cost Effective O Minimize Damage During Removal e Characterize Morphology a Reconstitute for Leak Rate & Burst Testing e in Situ Leak Test Before Removal l l VUTEC - 1 september 1,1994 NRC_O901.OVH

ESTNGHOUSE PROPRIETARY CLASS 26 VUTEC e Reconstitution a,b,c O Weld Removed Window into Surrogate Tube a Electron Beam or Laser YAG Weld More Uniform i a 1.5 mil Contraction Across Crack u No Change in NDE Response O Burst Test Produced Comparable Results a Additional Testing Required for Qualification O Effect on Leak Rate to be Tested a Expected to be Quantifiable a Consistent l VUTEC - 2 sept.mt* 1,19H Nac osoi.ovs

WESTINGHOUSE PROPRIETARY CLASS 2C VUTEC e Other Benefits l a, c, e O Sampling of Undisturbed TSP Crevice O Visual Examination Through Window a Other Secondary Side Locations i a,c,e e On Board RPC Accurately Locates Indication 1 i VUTEC - 3 s.pt.mb.r 1,1994 NRC_0901.OVH

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O a, C, 9 -Tubig Bode &&,vSUV.. &sM ~ - ~O ,. J " us v i v L/ g Leak Rate and \\ M j Sample Retieval Burst Test g $l l O O a l! L l m v Surrogate Tube E.B. or Laser Weld i Tubing Sample Reconstitution l

usTm PROPRIETARY CLASS 2C In Situ Leak Testing e issue - Leak Characteristics Affected by Tube Pull O Free-Span Test Rate >> In Situ Leak Rate a Demonstrated by Electricitie de France Negligible Rates for Entire SG a O Post-Pull Morphology Deerent from Pm Pull Degradation Exposed to Pull Loads a a Post-Pull Bobbin Amplitudes Are Larger a Increased Leak Rate Likely a Decreased Burst Pressure Possible O Tube Removalis Exposure & CostIntensive Leak - 1 sept.mber 1.1994 NRC_0901,OVH

WESTINGHOUSE PROPNit.i Ani LLads a In Situ Leak Testing e Solution - Measure Leak Rate in Place O EdF Approach to Measure Entire Generator a Misses Individual Leak Rate Characteristics i O Lesk Test of Individual Indications Desirable a Characterize Behavior of Plant e increase Database of Leak Rate information O Reduce Number of Tube Pulls a Reduce Exposure to ALARA a Reduce Maintenance Expense l l l Leak - 2 s.ptenk 1,1994 NRC_0901.OVH

WES11NGHOUSE PROPRIETARY CLASS 20 in Situ Leak Testing e Design Objectives a, c, e O Measure Leak Rate of Through Wall Cracks in SG Tubes a 3/4" & 7/8" OD SG tubes a 0.001 GPM s Leak Rate s 3 GPM J 1000 psi s Differential Pressure s 3000 psi s O Apply to Individual Indications Initial Application for Straight Leg Only a l e TSP Indications a Free-Span Indications e Requirements O Very Limited TSP Displacement During SLB Probably ~ 0.1" to 0.2" a Single End of Indication Limited Leak Rate e O Tube Leg Without Sleeve Free Span Indications a Leak - 3 s ptember 1,19H NRC_0901.OVH

r WESTINGHOUSE PROPRIETARY CLASS 20 in Situ Leak Testing 1 e Design C.oncept a, c, e O Mandrel with Expandable Bladders at Each End a Similar to Sleeve Expansion Mandrels a Could Seal with O-Rings O Bladders Pressurized to ~ 4000 psi to Effect Seal O Water Introduced into Space Between Bladders a Monitor Rate of Water Introduced into System a Leak Rate Versus Pressure Reported O Mandrel Design Can Simulate Capped End Condition NRC_0901.OVH Leak - 4 sept.mber 3. m4 E

@TNGHOUSE PROPRIETARY CLASS 2C In Situ Leak Testing e Benefits O ALARA Alternative to Tube Removal O Efficient Testing of Multiple Locations O Potential for Significantly Larger Database O Can Also be Used as a Hydrotest a Greater Pressures Achievable e Status O Functional Requirements Established O Controls Concept Designed O Mandrel Concept Designed O Test Equipment on Order L e Application O Fall Outage Season for 7/8" Demonstration Leak - 5 s.pt.n*, i.1994 une_osoi.ovs l __}}

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