ML20199D465

Summary of 860527 Meeting W/Util,B&W & Metal Improvement Co in Bethesda,Md Re Plans to Perform Shot Peening of Unit 1 Steam Generator Tubes.Results of Unit 2 Tests of Steam Generator Tubes Also Reviewed.Attendee List Encl

ML20199D465
Person / Time
Site:	Mcguire, McGuire
Issue date:	06/10/1986
From:	Hood D Office of Nuclear Reactor Regulation
To:	Office of Nuclear Reactor Regulation
References
NUDOCS 8606200331
Download: ML20199D465 (31)

Text

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.w Pi a Docket Nos.: 50-369 10 m M and 50-370 LICENSEE: Duke Power Company FACILITY: McGuire Nuclear Station,= Units 1 and 2 SU8 JECT: SUMARY OF MAY 27, 1986 MEETING REGARDING MCGUIRE UNIT 1 STEAM GENERATOR TUBE SHOT PEENING PLANS AND MCGUIRE UNIT 2 TUBE INSPECTION RESULTS On May 27, 1986, and Wilcox (B&W),the andNRC Metalmet with DukeCompany Improvement Power Comp (any)(the MIC to discuss licensee),

plans to Babcock perform shot peening of the McGuire Unit 1 steam generator tubes during the

-current refueling outage. Meeting attendees are listed in Enclosure 1.

Shot peening of the Unit I steam generator tubes is planned as a preventive measure against primary water stress corrosion cracking (PWSCC) within the tubesheet region. Basically, shot peening is a process of surface mechanical treatment which improves a tube's resistance to PWSCC by replacing tube tensile stress with a thin compressive stress layer. The process is scheduled.to begin in early June 1986, with B&W as contractor responsible for the steam generator's nuclear environment and MIC as subcontractor responsible for conduct of the shot peening operation. The meeting discussion consisted of presentations of the information on the viewgraph slides shown as Enclosure 2.

The meeting also included a review of results of eddy current tests of Unit 2 steam generator tubes conducted during the current refueling outage. These results are shown in Enclosure 3.

\ST Darl Hood, Project Manager PWR Project Directorate #4 Division of PWR Licensing-A

Enclosures:

As stated 8606200331 860610 PDR ADOCK 05000369 P PDR _

.M Y PWR#4/DPWR-A PWRf4/DPWR-A DHood/mac h8JYoungblood 06/q /86 06/q /86

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Mr. H. B. Tucker Duke Power Company McGuire Nuclear Station cc:

Mr. A. Carr -Dr. Jchn M. Barry Duke Power Company Department of Environmental Health P. O. Box 33189 Mecklenburg County 422 South Church Street 1200 Blythe Boulevard Charlotte, North Carolina 28242 Charlotte, North Carolina 28203 Mr. F. J.~Twogood County Manager of Mecklenburg County Power Systems Division 720 East Fourth Street Westinghouse Electric Corp. Charlotte, North Carolina 28202 P. O. Box 355 Pittsburgh, Pennsylvania 15230 Chairman, North Carolina Utilities Connission Mr. Robert Gill Dobbs Building Duke Power Company 430 North Salisbury Street Nuclear Production Department Raleigh, North Carolina 27602 P. O. Box 33189 Charlotte, North Carolina 28242 Mr. Dayne H. Brown, Chief Radiation Protection Branch J. Michael McGarry, III, Esq. Division of Facility Services f

Bishop Liberiaan, Cook, Purcell Department of Human Resources and Reynolds P.O. Box 12200 1200 Seventeenth Street, N.W. Raleigh, North Carolina 27605 Washington, D. C. 20036 Senior Resident Inspector c/o U.S. Nuclear Regulatory Comission Route 4. Box 529 Hunterville, North Carolina 28078 Regional Administrator, Region II U.S. Nuclear Regulatory Commission.

l 101 Marietta Street, N.W., Suite 2900 Atlanta, Georgia 30323 l L. L. Williams l~ Operating Plants Projects

!- Regional Manager Westinghouse Electric Corporation - R&D 701 P. O. Box 2728 Pittsburgh, Pennsylvania 15230

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ATTENDEES MAY 27, 1986 NAME ORGANIZATION ErT Hood PERN7DPEGI/NRR Julio Torre DPC Jerry Day DPC James Gutzwiller B&W Alvin Jenkins B&W Robert Gill Duke Dan Mayes Duke

-Ted Sullivan NRC/NRR Terry Keane Dominion Engineering James Daly Metal Improvement Company C. W. Hendrix, Jr. Duke C. D. Sellers NRC/NRR George Johnson NRC/NRR/PWR-A/EB R. B. Borsum D&W H. F. Conrad NRC/NRR/BWR/EB

Philip E. Troy South Carolina Electric & Gas Co.

l Sanford Hellman B&W T *Lynn Connor Doc-Search Associate Jeff Gonnan Dominion Engineering

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, SHOT PEENING MEETING BETHESDA, MARYLAND MAY 27,1986 AGENDA

1. INTRODUCTION DAN MAYES/DPC 1

2. PROBLEM DEFINITION DAN MAYES/DPC l -- PSCC

-- ELEMENTS OF PROBLEMS l -- APPROACHES TO PROBLEM 1

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3. SHOT PEENING

\ - ALVIN JENKINS/B&W A. PROCESS & PROCESS CONTROLS B. PEENING EQUIPMENT

! C. QUALIFICATION OF PROCESS JIM GUTZWILLER/B&W o OD STRESS o CORROSION TESTS o EFFECT ON EC

4. APPLICATION AT McGUIRE A. ROGER ALVIN JENKINS/B&W t B. REMOTE CONTROLS ALVIN JENKINS/B&W C. EXPOSURE ESTIMATES / TERRY KEANE/DPC ALARA PLAN

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5. SHOT PEENING

SUMMARY

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..i Duke Power Company -

s Presentation on ~

B&W Shot Peening ,

May 27,19 86 i

Bethesda, Md Presented by Dan Mayes I

(704) 373-4211 s

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. I Introduction -

Problem: Primary water stresa corrosion oracking (PW8CC) within tubesheet region.

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Aware of PWSCC since Fall 1984 Ntiated design study h January 1985 contracted saw to do shot % h December 1985 I

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c. Locations of Alloy 600 Tube Cracking f

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PW8CC Design 8tudy January 1985 .

Objectives i

1. hvastloate parameters whkh affect PWSCC fahres,

2. Determine the auncepttsty of DPCo steam generators.

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3. Evaluate and reconmend remedal actions to prevent PWSCC.

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A. Material susceptbility j 1. Anneedng termerattre and time J

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Mechanical roll - residual stress i a.

Roll transition j b. RolRng irregularities i

2. Operating stress add to residual stress

. C. Agessive environment primary water i

1. Termerattre Thot) = 617 F 1

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e Susceptibility of DPCo tObing to ~

I PWSCC .

1. Materials Database: Devekv based on certife' d mill test reports

, a. Yleid stress range low 40's to mid 70's i

j b. ten 1perattre = 1750 F i,

I i 2. Establish manufacttsing parameters i

a. Roling irreal irities i

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2. Over rolls i 1

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3. WaN G ac ac high as 11%

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Remedial measures to prevent PWSCC .

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A. Thermal stress relief treatisent

1. Local stress relief

2. Gobal heat treabinent i

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1. Roto poening

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BABCOCK & WILCOX .

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B&w/MIC TEAM RELATIONSHIP B&W -

CONTRACTOR MIC -

SUBCONTRACTOR T

TECHNOLOGIES i

B&W -

STEAM GENERATORS l

NUCLEAR ENVIRONMENT MIC -

SHOT PEENING l

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S- O' PEENING '

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REPLACES TENSILE STRESS WITH -

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KEY PARAMETERS l

COVERAGE INTENSITY

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i SHOT PEENING ,

1 PARAMETERS VARIABLES CONTROL i

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SIZE SHAPE FIXED BY COVERAGE 1

MATERIAL SPECIFICATION  :

INTENSITY HARDNESS i

. IMPACT ANGLE NOZZLE DESIGN FLOW DISTR. NOZZLE DESIGN

, MASS FLOW PROCESS CONTROL ,

i VELOCITY PROCESS CONTROL TIME PROCESS CONTROL 4

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BEAVER VALLEY 2- SHOT PEENING

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PROPOSED SCHEDULE REYO (DEC85)

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ROGER EXPERIENCE I

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1 O USED AT THIRTEEN PLANTS ' FROM l

MARCH 1984 TO PRESENT (OTSG AND l RSG)

O USED FOR EDDY CURRENT TESTING OF APPROXIMATELY 32,000 TUBES O USED FOR PLUGGING OF APPROXIMATELY r -

850 TUBES O USED ALSO FOR:

PROFILOMETRY (5OO TUBES)

SLEEVING (10 TUBES)

TUBE END REPAIR (2808 TUBES} j' 1

PLUG REMOVAL AND NEW WELD PLUG INSTALLATION (52 PLUGS) l TUBE PULLING l

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o ROGER / PEENING S YSTEM INTERFACE i

j o HEPA FILTERS '

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i SHOT CHANGES '

s FILTER CHANGES TOOL HEAD INSTALLATION / REMOVAL l

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SHOT PEENING QUALIFICATION O PROCESS O EQUZPMENT W

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1 PROCESS QUALIFICATION OBJECTIVES O SHOT PEENING IMPROVES TUBE'S l RESISTANCE TO PWSCC l

O SHOT PEENING DOES NOT CAUSE AN O~.D. PROBLEM O SHOT PEENING DOES NOT ADVERSELY AFFECT EDDY CURRENT EXAMINATIONS -

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EQUIPMENT QUALIFICATION o Equipment used in the field penned The NaOH corrosion test samplem I

o Equ1pment functionally checked out to a detailed procedure including ability to repeat original equipment performance o Field equipment used in formal process and operator qualifications, sim11ar to welding i -

qualifications Demonstrated consistency in peaning tubes i

Demonstrated consistency in paening I strips l

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OPERATOR QUALIFICATIONS OPERATOR TRAINING Peening Equipment Peening Procedures Control Computer DEMONSTRATED ABILITY TO OPERATE EQUIPMENT Peen I Strips Peen & Examine Tubem f

OPERATORS ARE CERTIFIED AS HAVING MET ALL REQUIREMENTS 4

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QUALIFICATION

SUMMARY

o Process Qualified Significant improvement in resistance to PWSCC Peening does not cause an OD problem Eddy current is not adversely affected T .

o Equipment Qualified l

Thorough testing and check out Used to poen corrosion samples o People Qualified Operator Training Operator Performance Testing i .

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. t McGUIRE UNIT 1 SH0T PEENING DOSE REDUCTION t

e EQUIPMENT AND PROCESS DESIGN REVIEWS k

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e PROCEDURE REVIEWS e DETAILED EXPOSURE ESTIMATE e EXTENSIVE NOCKUP TRAINING e SHIELDING l

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McGUIRE UNIT 1 SHOT PEENING DOSE ESTIMATE o PLATFORM & EQUIPMENT HP .200 SETUP / INSTALLATION MAINT/ ENGR 3.840 (INCLUDING 1 ROGER MOVE) LABOR .480 0 CALIBRATION AND TEST HP .670 (14 ea) MAINT/ ENGR .140

, LABOR 6.300 0 SHOT CHANGE HP .250 (5 ea) LABOR 1.250 I

! O DUST FILTER / COLLECTOR HP .735 CHANGE 0VT (15 ea) LABOR 4.410 o HEPA' CHANGE HP .060 (5 ea) LABOR .320 0 SYSTEM MAINT HP .300 MAINT/ ENGR 1.800 t o CLEANUP / INSPECTION HP .150 (CHANNEL HEAD) MAINT/ ENGR 2.970 0 PLATFORM & EQUIPMENT HP .150 r

REMOVAL / TEARDOWN MAINT/ ENGR 1.425 LABOR .705 1

26.155 l

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e HP 2.515 PERSON-REM MAINT/ ENGR 10.175

. LABOR 13.465 r _

TOTAL PER GENERATOR 26.155 4 GENERATORS 104.620 CDRIINGENCY 10.48 TOTAL FOR JOB 115.100 GOAL 100.000 PERSON-REM e

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Summary of Shot Peening Factors

1. Protection against PWSCC by inducing compressive stress. -

1 1 2. Minimum increase in OD stress. -

3. Peen all geometries and roling 'rregularities.

4. Peening parameters are forgiving.

5. No effect on eddy current inspection.

{ 6. Design with ALARA concepts in mind.

j 7. Small compact design for ice containment

8. Design for zero lost shot.

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. 'e Enclosure 3 McGuire Unit 2 SG Tube Inspection Results Steam Generator A B C D No. of tubes inspected 565 F 419 F 127 P 62 P (F = full length; P =

partial length)

Row 1 tubes plugged 114 114 114 64 Tube sheet indications 0 0 2 1 plugged Tube sheet minor 79 107 45 53 1rregularities noted T

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MEETING

SUMMARY

DISTRIBUTION

- I hcket File ) NRC Participants WRC Pux L PDR NSIC PRC System PWRf4 Reading File .

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Project Manager " 'I --

M. Duncan 3,- gg Attorney, OELD J. Partlow -

E. Jordan B. Grimes ACRS (10)

OTHERS bec: Licensee & Service List i

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