ML20202C878

Forwards Summary of 860527 Meeting W/Util Re Unit 1 Steam Generator Tube Shot Peening Plans & Unit 2 Tube Insp Results

ML20202C878
Person / Time
Site:	Mcguire, McGuire
Issue date:	07/09/1986
From:	Hood D Office of Nuclear Reactor Regulation
To:	Pearl W NWT CORP.
References
NUDOCS 8607110455
Download: ML20202C878 (1)

Text

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Docket Nos.: 50-369 and 50-370 0 9 JUL 1986

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Mr. W. L. Pearl, President NWT Corporation 7015 Realm Drive San Jose, California 95119

Dear Mr. Pearl:

As requested in your June 19, 1986, letter enclosed is a copy of the summary of the May 27, 1986, meeting with Duke Power Company to dis-cuss McGuire Unit 1 steam generator tube shot peening plans and Unit 2 tube inspection results.

Sincerely, l55 Darl Hood, Project Manager PWR Project Directorate #4 Division of PWR Licensing-A

Enclosure:

Meeting Sumary

, DISTRIBUTION:,

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NRC POR Local PDR PRC System PWR#4 Rdg MDuncan BJYoungblood Rdg DHood 3_V .95f b PWR R-A PWR#4/DPWR-A PWR#4/DPWR-A M e mac .DHood BJYoungblood 07/C /86 07/ q /86 07/ g /86 8607110455 860709 PDR ADOCK 05000369 P PDR

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1. UNITED STATES I 9,,

$ o NUCLEAR REGULATO'RY COMMISSION WASHINGTON, D. C. 20665 y I i

10 JUN 1986 D..".... e i Docket Nos.: 50-369 and 50-370 i

LICENSEE: Duke Power Company FACILITY: McGuire Nuclear Station, Units 1 and 2

SUMMARY

OF MAY 27, 1986 MEETING REGARDING MCGUIRE UNIT 1 STEAM GENERATOR TUBE SHOT PEENING PLANS AND MCGUIRE UNIT 2 TUBE INSPECTION RESULTS any (the licensee), Babcock On May 27, 1986, the NRC and Wilcox (B&W), and Metal Improvement Company met with Duke Power Comp (MIC) to discuss plans to l

perfom shot peening of the McGuire Unit 1 steam generator tubes during the i current refueling outage. Meeting attendees are listed in Enclosure 1.

lf Shot peening of the Unit 1 steam generator tubes is planned as a preventive

- measure against primary water stress corrosion cracking (PWSCC) within the i

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 l consisted of presentations of the infomation 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.

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

Enclosures:

As stated t ,

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ATTENDEES MAY 27, 1986 .

NAME ORGANIZATION THR?fHood PWRf4/DPWR-A/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 B&W H. F. Conrad NRC/NRR/BWR/EB

. Philip E. Troy South Carolina Electric & Gas Co.

Sanford Hellman B&W 7

. *Lynn Connor Doc-Search Associate Jeff Gorman Dominion Engineering

• Part Time e

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DUKE /B&W/NRC SHOT PEENING. MEETING

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BETHESDA, MARYLAND -

MAY 27,1986 ,

AGENDA l'

1. INTRODUCTION DAN MAYES/DPC ,

2. PROBLEM DEFINITION DAN MAYES/DPC

-- PSCC

-- ELEMENTS OF PROBLEMS

-- APPROACHES TO PROBLEM I-

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 CORROSlON TESTS I o EFFECT ON EC -

4. APPLICATION AT McGUIRE A. ROGER ALVIN JENKINS/B&W

! B. REMOTE CONTROLS ALVIN JENKINS/B&W C. EXPOSURE ESTIMATES / TERRY KEANE/DPC ALARA PLAN I

5. SHOT PEENING

SUMMARY

DAN MAYES/DPC l

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Duke Power Company Presentation on .

B&W Shot Peening

) May 27,1986

, Bethesda, Md ,

i Presented by Dan Mayes (704) 373-4211 ,

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Introduction i;

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Problem: Primary water stress corrosion j .. cracking (PWSCC) within tubesheet region.

• Aware of PWSCC shoe fan 1984 I

• Ntlated deshy1 study b January 1985 l

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• Contracted B&W to do shot peenho h Decnii,er 1985 e

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PW8CC Design 8tudy January 1985 Objectives

1. hvestigate parameters which affect PWSCC failures.

2. Determhe the susceptt2ty of DPCo steam generators.

3. Evaluate and reconnend remedal actions to prevent PWSCC.

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Parameters which affect PWSCC

! A. Material susceptbility '

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1. Amealing terrporature and time 1

2. Carben content a

B. Tensile Stress j 1. Mechanical roll - residual stress '

a. Rol transition I b. Rollbg irregularities 1

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, C. Agessive environment - primary water '

1. Tenperattre Thot) = 617 F

1 Susceptibility of DPCo tubing to J PWSCC -

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.. Materials Database: Develop based on certified mill test reports

a. Yield stress range low 40's to mid 70's

b. temperature = 1750 F

2. Establish manufacttring parameters i

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a. Rolling irregJarities 1

1. Skiprolls 3 2. Over rok

3. Wall thinning ac high as 11%

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) Remedial measures to prevent PWSCC .

A. hnal stress reRef treatment -

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1 i 1. Local stress relief

2. Gobal heat treatment i .

EL Nckel plating

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C. Explosive refonks i

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1. Roto peening

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4 S"OT PEENING i

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SUBCONTRACTOR TECHNOLOGIES B&W -

STEAM GENERATORS NUCLEAR ENVIRONMENT MIC -

SHOT PEENING 4

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S H O I. PEENING .

l. WHY l REPLACES TENSILE STRESS WITH .

!' THIN COMPRESSIVE STRESS LAYER KEY PARAMETERS -

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COVERAGE INTENSITY

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SHOT PEENING ,

s PARAMETERS VARIABLES CONTROL SHOT -

SIZE .

SHAPE FIXED BY .,

COVERAGE MATERIAL SPECIFICATION INTENSITY HARDNESS '

IMPACT ANGLE NOZZLE DESlGN

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e ROGER EXPERIENCE O USED AT THIRTEEN PLANTS FROM MARCH 1984 TO PRESENT (OTSG AND RSG)

O USED FOR EDDY CURRENT TESTING OF APPROXIMATELY 32,OOO TUBES O USED FOR PLUGGING OF APPROXIMATELY T

. 850 TUBES O USED ALSO FOR:

PROFILOMETRY (500 TUBES)

SLEEVING (10 TUBES)

TUBE END REPAIR- ( 280 8 TUBES)

PLUG REMOVAL AND NEW WELD PLUG

. INSTALLATION (52 PLUGS)

TUBE PULLING l

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I PROVING RUN i

o ROGER / PEENING SYSTEM INTERFACt.

, o HEPA FILTERS -

l o HOT PLANT ACTIVITIES i

SHOT CHANGES .

FILTER CHANGES TOOL HEAD INSTALLATION / REMOVAL

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. s l SHOT PEENING QUALIFICATION O PROCESS e

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PROCESS QUALIFICATION

OBJECT.LVES l O SHOT PEENING' IMPROVES TUBE'S RESISTANCE TO PWSCC 4

, O SHOT PEENING DOES NOT CAUSE AN O~.D. PROBLEM -

p O SHOT PEENING DOES NOT ADVERSELY AFFECT EDDY CURRENT EXAMINATIONS -

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e EQUIPMENT OUALIFICATION .

o Equipment used in the f,1 eld paened The NaOH corrosion test samples o Equipment functionally checked out to a detailed procedure including ability to repeat original equipment performance o Field equipment used in formal process and operator

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qualifications, similar to welding I ~

. qualifications Demon'strated consistency in

poening tubes Demonstrated consistency in peening I strips I

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., OPERATOR QUALIFICATIONS OPERATOR TRAINING Peening Equipment i Peening Procedures Control Computer I

DEMONSTRATED ABILITY TO OPERATE EQUIPMENT Peen I Str1pm Peen & Escamine Tubem f .

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OPERATORS ARE CERTIFIED AS HAVING MET ALL REQUIREMENTS l

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QUALIFICATION

SUMMARY

o Process Qualified Significant improvement in resistance to PWSCC

. l Peen 1ng does not cause an OD prob 1mm Eddy current i s' not advermely affected T

o Equipment Qual 1fied Thorough testing and check out Used to pean corrosion samples o People Qualified Operator Training Operator Performance Testing e

_.... . .. . - - . . . . . - = . - . . . . - . = . - - - - - - .

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McGUIRE UNIT 1 SHOT PEENING DOSE REDUCTION e EQUIPMENT AND PROCESS DESIGN REVIEWS s PROCEDURE REVIEWS 7 .

e DETAILED EXPOSURE ESTIMATE e EXTENSIVE MOCKUP TRAINING e SHIELDING G

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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 o 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 0UT (15 ea) LABOR 4.410 o HEPA CHANGE HP .060 (5 ea) LABOR .320 0 SYSTEM MAINT HP'

' .300 MAINT/ ENGR 1.800 0 CLEANUP'/ INSPECTION HP .150 (CHANNEL HEAD) MAINT/ ENGR 2.970 0 PLATFORM & EQUIPMENT HP .150 REMOVAL / TEARDOWN MAINT/ ENGR 1.425 LABOR .705 26.155 r

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HP 2.515 PERSON-REM MAINT/ ENGR 10.175 LABOR 13.465 r ,

TOTAL PER GENERATOR 26.155 4 GENERATORS 104.620 CONTINGENCY 10.48 TOTAL FOR JOB 115.100 1

GOAL 100.000 PERSON-REM w

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i I. 2. ._______L_

r Summary of Shot Peening Factors i

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.. 1. Protection against PWSCC by inducing compressive stress.

2. Minimirn increase in OD stress.

! 3. Peen all geornetries and rollirig irregularities. .

j 4. Peening parameters are forgiving.

5. No effect on eddy ctrrent inspection. 4 l

) 6. Design with ALARA concepts in mind.

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7. Small compact design for ice containment.

8. Desigi for zero lost shot.

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