ML20202C878
| 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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UNITED STATES
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NUCLEAR REGULATO' Y COMMISSION I$
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WASHINGTON, D. C. 20665 10 JUN 1986 i
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Docket Nos.: 50-369 and 50-370 i
LICENSEE:
Duke Power Company FACILITY:
McGuire Nuclear Station, Units 1 and 2
SUBJECT:
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 met with Duke Power Comp (MIC) to discuss plans to and Wilcox (B&W), and Metal Improvement Company 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 tubesheet region. Basically, shot peening'is a process of surface mechanical i
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 infomation on the viewgraph slides shown as l.
The meeting also included a review of results of eddy current tests of Unit 2 These steam generator tubes conducted during the current refueling outage.
results are shown in Enclosure 3.
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Darl Hood, Project Manager
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l 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
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SHOT PEENING. MEETING 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
ALVIN JENKINS/B&W 3.
SHOT PEENING 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 5.
SHOT PEENING
SUMMARY
DAN MAYES/DPC l
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Duke Power Company Presentation on B&W Shot Peening
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May 27,1986 Bethesda, Md i
Presented by Dan Mayes (704) 373-4211 I
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-.j Introduction i;
i 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
l 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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1 Parameters which affect PWSCC A.
Material susceptbility l
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Amealing terrporature and time 2.
Carben content 1
B.
Tensile Stress a
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Mechanical roll - residual stress a.
Rol transition I
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Rollbg irregularities 1
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Operating stress add to residual stress i-C.
Agessive environment - primary water 1.
Tenperattre Thot) = 617 F
1 Susceptibility of DPCo tubing to PWSCC J
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1.
Materials Database: Develop based on certified mill test reports Yield stress range low 40's to mid 70's a.
b.
temperature = 1750 F 2.
Establish manufacttring parameters i
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Rolling irregJarities 1.
Skiprolls 1
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Over rok 3.
Wall thinning ac high as 11%
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Remedial measures to prevent PWSCC A.
hnal stress reRef treatment i
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Local stress relief i
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Gobal heat treatment i
EL Nckel plating
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Explosive refonks i
D.
Strface rnechanical treatment which inouces compressive stress i
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Roto peening 2.
Shot peering
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4 S"OT PEENING i
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e B&W/MIC TEAM RELATIONSHIP CONTRACTOR B&W SUBCONTRACTOR MIC TECHNOLOGIES STEAM GENERATORS B&W NUCLEAR ENVIRONMENT SHOT PEENING MIC 4
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S H O I.
PEENING l.
WHY l
REPLACES TENSILE STRESS WITH THIN COMPRESSIVE STRESS LAYER KEY PARAMETERS i
l 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 FLOW DISTR.
NOZZLE DESIGN I
MASS FLOW PROCESS CONTROL VELOCITY PROCESS CONTROL' l
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PROPOSED SCHEDULE REYO (DEC85) 8b'
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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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PROVING RUN i
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o HOT PLANT ACTIVITIES SHOT CHANGES i
FILTER CHANGES TOOL HEAD INSTALLATION / REMOVAL
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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
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qualifications Demon'strated consistency in poening tubes Demonstrated consistency in peening I strips I
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s OPERATOR QUALIFICATIONS OPERATOR TRAINING Peening Equipment 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 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
.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 GOAL 100.000 PERSON-REM 1
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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.
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6.
Design with ALARA concepts in mind.
1, 7.
Small compact design for ice containment.
8.
Desigi for zero lost shot.
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