ML20140D089

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Summary of 851213 Meeting W/Util,Epri & Structural Integrity Assoc in Bethesda,Md Re Contingency Plan for Repairing Safe end-to-nozzle Welds Involving Use of Temper Bead Repair Technique.Agenda & Viewgraphs Encl
ML20140D089
Person / Time
Site: Hatch  
Issue date: 01/21/1986
From: Rivenbark G
Office of Nuclear Reactor Regulation
To:
Office of Nuclear Reactor Regulation
References
NUDOCS 8601290129
Download: ML20140D089 (25)
v • d • e


Text

{{#Wiki_filter:. January 21 1986 0 Docket Nos. 50-321/366 DISTRIBUTION 0 ELD Docket File GRivenbark NRC PDR EJordan local PDR JPartlow PD#2 Reading BGrimes LICENSEE: Georgia Power Company DMuller ACRS (10) Plant File NRC Participants FACILITIES: Hatch Units 1 and 2

SUBJECT:

SUMMARY

OF DECEMBER 13, 1985 MEETING WITH GE0PGIA POWER COMPANY ON A SAFE END-TO-N0ZZLE WELD REPAIR PLAN A meeting with Georgia Power Company (GPC) representatives was held in Bethesda, Maryland on December 13, 1985 to allow GPC and its consultants to describe to the staff, a contingency plan for repairing safe end-to-nozzle welds. The plan involves the use of the " temper bead" repair technique. GPC consultants described the development work that had been performed on this repair technique. The agenda for the meeting and discussion slides as well as a list of meeting attendees is enclosed. Original signed by/ George Rivenbark, Project Manager BWR Project Directorate #2 Division of BWR Licensing

Enclosures:

o As stated cc w/ enclosure: See next page 1 ( A DB PD#2 DBL 1#2 SN r s:rc GRi nbark 01/; 7/86 01/g/86 G601290129 860121 PDR ADOCK 0500 1 P

Mr. J. T. Beckham, Jr. Edwin I. Hatch Nuclear Plant, Georgia Power Company Units Nos. I and 2 CC* G. F. Trowbridge, Esq. Shaw, Pittman, Potts and Trowbridge 1800 M Street, N.W. Washington, D.C. 20036 Mr. L. T. Gucwa Engineering Department Georgia Power Company P. O. Box 4545 Atlanta, Georgia 30302 Mr. H. C. Nix, Jr., General Manager Edwin I. Hatch Nuclear Plant Georgia Power Company P. O. Box 442 Baxley, Georgia 31513 Mr. Louis B. Long Southern Company Services, Inc. P. O. Box 2625 Bimingham, Alabama 35202 Resident inspector U.S. Nuclear Regulatory Conpission Route 1, P. O. Box 279 Baxley, Georgia 31513 Regional Administrator, Region II U.S. Nuclear Regulatory Commission, 101 Marietta Street, Suite 3100 Atlanta, Georiga 30303 Mr. Charles H. Badger Office of Planning and Budget Room 610 270 Washington Street, S.W. Atlanta, Georgia 30334 Mr. J. Leonard Ledbetter, Comissioner Department of Natural Resources 270 Washington Street, N.W. Atlanta, Georgia 30334 Chaiman Appling County Comissioners County Courthouse Baxley, Georgia 31513 .- 7

Meeting Attendance List Georgia Power Company - Hatch Plant December 13, 1985 Name Affiliation G. Rivenbark NRC-BWR/DL P. Riccardella Structural Integrity Associates J. D. Heidt GPC/NSL J.A. Edwards GPC/NSL \\ W. J. Childs EPRI i L. T.Gucwa GPC f P. P. Norris GPC - Plant Hatch W. Hazelton NRC - BWR DL W. Koo NRC - BWR DL 5

1 CONTINGENCY PLAN FOR REPAIR WELDING 0F N0ZZLE-TO-SAFE END WELDS GEORGIA POWER COMPANY PLANT. HATCH DECEMBER 13, 1985 0 INTRODUCTION - L. GUCWA 0 DEVELOPMENT PROGRAM - W. CHILDS O O DEVELOPMENT DETAILS METALLURGICAL /M0CK UP - P. NORRIS ANALYTICAL DETAILS - P. RICCARDELLA 0 CONCLUSION - L.T. GUCWA 1 e

l CONTINGENCY PLAN FOR TEMPER BEAD WELD OVERLAY OF SAFE-END TO N0ZZLE WELDS PREPARED BY GEORGIA POWER COMPANY AND STRUCTURAL INTEGRITY ASSOCIATES PARTIALLY FUNDED BY ELECTRIC POWER RESEARCH INSTITUTE DECEMBER 13, 1985 i o

INTRODUCTION CONTINGENCY PLANNING FOR REPAIR OF POTENTIAL IGSCC FLAWS IN SAFE-END T0 INLET N0ZZLE WELDS TRADITIONALLY, TWO ALTERNATIVES FOR REPAIR REPAIR / REPLACE AND PWHT TEMPER BEAD REPAIR USING SMAW CURRENT PROGRAM FOCUSED ON DEVELOPMENT OF A THIRD ALTERNATIVE: TEMPER BEAD, INCONEL 82 WELD OVERLAY REPAIR USING MACHINE GTAW PROGRAM PARTIALLY FUNDED BY EPRI FOR GENERIC USE - EPRI REPORT WILL BE ISSUED. l 4

COMPARIS0N OF ALTERNATIVES PWHT: COSTLY AND DIFFICULT PROCESS TO IMPLEMENT ON OPERATING PLANT VESSEL LONG OUTAGE, HIGH EXPOSURE POTENTIAL FOR INTRODUCING HIGH RESIDUAL STRESSES ELSEWHERE IN VESSEL IF IMPROPERLY DONE APPLICABLE PRIMARILY TO REPLACEMENT PROGRAM EXPERIENCE OF OTHER UTILITIES SUPPORTS AB0VE TEMPER BEAD REPAIR USING SMAW: PERFORMED LOCALLY AT PILGRIM DURING N2 SAFE-END REPLACEMENT, ASME SECTION XI PROCEDURE CURRENTLY IN PLACE DIFFICULT PROCESS TO CONTROL SINCE MANUAL PROCESS ALMOST EXCLUSIVELY USED WITH REPLACEMENT MANUAL SMAW OVERLAY WOULD HAVE HIGH MAN-REM IMPACT AT SAFE-END LOCATION

COMPARIS0N OF ALTERNATIVES l (CONTINUED) TEMPER BEAD / WELD OVERLAY USING GTAW: PARAMETERS DEVELOPED BY B & W IN EPRI PROGRAM TO GIVE PROPER TEMPERING RECENTLY APPROVED SECTION XI CODE CASE INCORPORATES THESE RESULTS PROPOSED OVERLAY PROCEDURE MEETS INTENT OF CODE CASE (TEMPERED P3 MATERIAL) i CAN BE SHOWN EFFECTIVE FOR AT LEAST ONE FUEL CYCLE (PROBABLY SEVERAL) ALLOWS PLANNING 0F ORDERLY PIPE REPLACEMENT IF NECESSARY i MINIMUM IMPACT ON OUTAGE LENGTH I i i e

1. N0ZZLE TO SAFEND WELD-INCONEL BUTTER AND BUTT WELD 2 f4. THREE LAYER TEMPER BEAD WELD 5-6. OVERLAY AND GROOVE COMPLETED WITH WATER BACKING A. LOCATION OF MICR0 HARDNESS SURVEY BEND R. ~ l _ AREA IN l w l 4 l sos \\. _ _ _1__s._f'~l I iTENSILE' 4l f-

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N0ZZLE/SAFEND OVERLAY WELD PROCEDURE QUALIFICATION SEQUENCE OF OPERATION (OVERLAY M0CK-UP AND GROOVE) TEMPER BEAD (NOTE 1) 1. PREHEAT TO 350*F-HOLD 1/2 HOUR 2. DEPOSIT FIRST TEMPER BEAD LAYER (AS SHOWN ON SKETCH) 3. DEPOSIT SECOND TEMPER BEAD LAYER 4. DEPOSIT THIRD TEMPER BEAD LAYER REPEAT STEPS 2 THROUGH 4 FOR THREE AREAS AS SHOWN ON SKETCH 5. HOLD PREHEAT TO POSTHEAT 6. POSTHEAT 450-500'F FOR 3 HOURS-SLOW COOL 7. FILL MOCK UP WITH WATER, FLOW APPR0X 3 GPM 8. HELD BALANCE OF OVERLAY AND GROOVE WITH PARAMETERS FROM STEP 3 (SECgND TEMPER BEAD LAYER) WITH PREHEAT-INTERPASS 70-110 F NOTE 1-N0ZZ(EAND$UTTERONN0ZZLEWEREHEATTREATEDAT 1150 F + 25 F FOR 20 HOURS TO SIMULATE AS-INSTALLED CONDITION OF VESSEL

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WELDING PARAMETERS Modified Procedure F from EPRI NP-3614, Volume 2, July, 1984 Layer 1 Layer 2 Layer 3 Layer 4 Layer 5+ Current (A) 180 200 220 180 200 Voltage (V) 11 11 11 11 11 Wire Feed (ipm) 39 59 65 39 59 Travel (ipm) 8.5 7 6 8.5 7 Bead Overlap (%) 50 50 50 50 50 Preheat (OF) 300 300 300 300 300 Max. Interpass (OF) 500 500 500 500 500 Jules/in 14,000 18,900 14,200 14,000 18,900 (WaterBacked) Wire Diameter -- 0.035 Inch Shielding Gas -- AR 18 CFH Electrode -- 2% Thoria Tungsten; 5/32-Inch Diameter; 2-1/2-inch Total Stick-out (With Long Gas Cup); Tip: 22.50 Included Angle NOTES: 1. NO LAYER 3 PARAMETERS ON STAINLESS STEEL SIDE OF WELD 2. PREHEAT (250-3500F) ON FIRST 3 LAYERS AND POST WELD BAKING (1450-5500F) AFTERWARDS 3. PlPE FILLED WITH WATER AFTER FIRST 3 LAYERS

CHARPY "V" TEST RESULTS 40*F CV FT-LB % SHEAR .ATERAL EXPANSION A 67 60% 36 MILS B 88 70% 66 MILS C 69 50% 51 MILS BEND TEST NOTE - 7 BEVEL FUS10fl LINE IS NOT SUITABLE FOR SIDE BEND TEST BECAUSE THE BASE METAL AND WELD METAL DIFFER f1ARKEDLY IN BENDING PRO-PERTIES. BOTT0'i 0F GROOVE HAZ IS REPRESENTEp IN THE. SIDE BEllD SIMILAR TO AN ASME SECTION I QW-161,5 LONGITUDINAL BEllD TEST. TENSILE TEST RESULTS: TWO SAMPLES (93.2 KSI" 92','8 KSI) BOTHFAILEDINBASEN$TAL i f

"o Mardness Talues s Match Overlay Weld ~~ ~ o ,,' ' i.:: - Saup1e 00-5 ovfAL M H)?f >H ATh $*b*:' D$ ~! ...... s ".-54:.:ed.W~J' 'T 04'26 t - 8 7.' ~' ' t l '.~ D : - Distance fras Veld Fusion Line Row 1 Row 2 100 g ; 315 302 300 302 290 500 296 290 800 305 292 Base Metal 22) 1000 290 279 1200 266 256 1400 248 243 1600 246 229 1800 231 Sampie 01-2. GRooVf VVfLP NM M A007' area l Distance from ~ beside l Weld Fusion Line Ro s 1 Row 2 weld 100 m, 349 351 i 300 330 340 500 319 332 Base Metel 2N 700' 364 329 l 900 332 351 l 1100 334 312 1300 285 287 1500 248 259 17.0.0

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ANALYSES PERFORMED T0 QUALIFY PROPOSED OVERLAY PROCEDURE RESIDUAL STRESS ANALYSIS SIMULATED BUTT WELD RESIDUAL STRESSES IN WELDS-2 FINITE ELEMENT MODEL TEMPER BEAD OVERLAY PROCESS PRODUCES COMPRESSIVE STRESSES FOR SIGNIFICANT PORTION OF PIPE WALL l CRACK GROWTH ANALYSIS CORRELATION BASED UPON LIMITED EPRI DATA FOR CREVICED INCONEL SAMPLES IN AGGRESSIVE ENVIRONMENT DA/DT = 1.08 x 10-8 K.26 2 CRACK GROWTH RESULTS SHOW AT LEAST ONE FUEL CYCLE OF REPAIR LIFE )

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Distance from Inner Surface (In.) DVERLAY SEGMENT 34 DVERLAY SEGMENT 34 FINITE ELEMENT RESULTS - RESIDUAL STRESSES AFTER WELD OVERLAY

Upper Bund Ornnec Sensitirt c) ~ da 'dt 5.65s10~hK)3 UI 7 / [@ Best Estimate Ikeld Sensitired ) 3 ~ A daldt 8 2.27s10'8th)2 26 A/ -{ 8 'f / Estimate for inconel da/dt = 1.078x10-8 2.26 K i / p O / /mh / i...t /7 / 1 G',/ v hp 5 v { v V i = 4,. ,g e 9 f t i 3 A I se a a se se = ,,.iii.=*s sm a use C atk Growin Rate Curves to be Used in Fla. Evaluation Analysis and Supporting Data (From [PRI NP-2872) O st=s.'.sec.' use' so e.. T H

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RESULTS/ CONCLUSIONS . A CONTINGENCY REPAIR PROCEDURE IS BEING DEVELOPED AND QUALI-FIED FOR INCONEL-82 WELD OVERLAY REPAIR OF N0ZZLE TO SAFE-END WELDS. . PROCEDURE USES GTAW TEMPER BEAD PROCESS SIMILAR TO THAT DE-VELOPED UNDER EPRI SPONSORED PROGRAM AND RECENTLY APPROVED SECTION XI CODE CASE. . METALLURGICAL TESTING SHOWS THAT HEAT AFFECTED ZONE IS TEMPERED WITHOUT P HT, AND IS. CONSISTENT WITH THE RESULTS OF AB0VE EPRI PROGPAVCODE CASE, . ANALYSIS SHOWS THAT: - RESIDUAL STRESSES ARE HIGHLY FAVORABLE (SIMILAR TO CONVENTIONAL OVERLAYS) - CRACK GROWTH IN INCONEL-82 OVERLAY MATERIAL ACCEPTABLE FOR AT LEAST ONE FUEL CYCLE UNDER WORST CASE ASSUMP-TIONS.}}

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