ML20198K646
| ML20198K646 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 12/28/1998 |
| From: | Dromerick A NRC (Affiliation Not Assigned) |
| To: | NRC (Affiliation Not Assigned) |
| References | |
| NUDOCS 9812310119 | |
| Download: ML20198K646 (46) | |
Text
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December 28, 1998
' 'CENSEE: Britimors Gas and Electric Company i . ACILITY: Calvert Cliffs Nuclear Power Plant, Unit Nos.1 and 2 7
SUBJECT:
SUMMARY
OF THE DECEMBER 2,1998, MEETING REGARDING CALVERT CLIFFS NUCLEAR POWER PLANT, UNIT NOS.1 AND 2
_ On December 2,1998, Baltimore Gas and Electric (the licensee) met with the NRC staff at the NRC Headquarters in Rockville, Maryland to discuss its proposed Technical Specification (TS) s smendment allowing installation of sleeves in defective steam generator tubing in Calvert Cliffs Nuclear Power Plant, Unit Nos.1 and 2. The licensee submitted the TS amendment on November 30,1998. Meeting attendees are listed in Enclosure 1. The presentation slides J provided by the fict,1see are in Enclosure 2.
The licensee proposed sleeve is based on ABB-CE leak limiting alloy 800 sleeve design. Two s!eeve designs were prcposed: one is applied to cepairing tube flaws in egg crate support elevations and the otheris applied to repairing tube flaws in the expansion transition zone at the tope of the tubesheet. The major feature of the sleeve is the use of Alloy 800 and the use of a series of hydraulic expansion in the sleeve-tube joints to provide structural support and to limit potential leakage.
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The licensee presented installation process; eddy current and visual inspection; corrosion and ]
mechanical tests; and structural analysis. The staff asked the licensee questions regarding 5
sleeve design, including corrosion tes'. results and structural tests. The staff indicated that it ;
i may issue a formal request for additional information as its review progresses.
The licensee requested staff approval of the sleeving amendment by October 1,1999, so that ]
alloy 800 sleeves may be used during the Unit refueling outage in the spring of 2000.
Sincerely.
ORIGINAL SIGNED BY:
Alexander W. Dromerick, Senior Project Manager Project Directorate 1-1 Division of Reactor Projects - t/ll Office of Nuclear Reactor Regulation
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Docket Nos. 50-317 and 50-318
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Enclosures:
- 1. List of Attendees I
- 2. Presentation Slides O j cc w/encis: See next page ;
DOCUMENT NAME: G:\CC1-2\MTS12298.WPD
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W DATE 12/M/98 12/JE/98 () 12/31/98 Official Record Copy
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/ 9812310119 981228 PDR ADOCK 05000317 p PDR
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" " l NUCLEAR REGULATORY COMMISSION !
f WASHINGTON, D.C. 2066M001 I
%, # December 28, 1998 LICENSEE: Baltimore Gas and Electric Company FACILITY: Calvert Cliffs Nuclear Power Plant, Unit Nos.1 and 2 i
SUBJECT:
SUMMARY
OF THE DECEMBER 2,1908, MEETING REGARDING CALVERT CLIFFS NUCLEAR POWER PLANT, UNIT NOS.1 AND 2 On December 2,1998, Baltimore Gas and Electric (the licensee) met with the NRC staff at the NRC Headquarters in Rockville, Maryland to discuss its proposed Technical Specification (TS) amendment allowing installation of sleeves in defective steam generator tubing in Calvert Cliffs 1 Nuclear Power Plant, Unit Nos.1 and 2. The licensee submitted the TS amendment on November 30.1998. Meeting attendees are listed in Enclosure 1. The presentation slides provided by the licensee are in Enclosure 2.
The licensee proposed sleeve is based on ABB-CE leak limiting alloy 800 sleeve design. Two sleeve designs were proposed: one is applied to repairing tube flaws in egg crate support elevations and the other is applied to repairing tube flaws in the expansion transition zone at the tope of the tubesheet. The major feature of the sleeve is the use of Alloy 800 and the use of a series of hydraulic expansion in the sleeve-tube joints to provide structural support and to limit potentialleakage.
The licensee presented installation process; eddy current and visual inspection; corrosion and mechanical tests; and structural analysis. The staff asked the licensee questions regarding sleeve design, including corrosion test results and structural tests. The staff indicated that it I may issue a formal request for additional information as its review progresses.
The licensee requested staff approval of the sleeving amendment by October 1,1999, so that alloy 800 sleeves may be used during the Unit refueling outage in the spring of 2000.
Sincerely, M v Alexander W. Dromerick, Senior Project Manager Project Directorate I-1 Division of Reactor Projects - 1/il Office of Nuclear Reactor Regulation Docket Nos. 50-317 and 50-318
Enclosures:
- 1. List of Attendees
- 2. Presentation Slides cc w/encis: See next page
Calvert Cliffs Nuclear Power Plant Baltimore Gas & Electric Company Unit Nos.1 and 2 cc:
President Mr. Joseph H. Walter, Chief Engineer Calvert County Board of Public Service Commission of Commissioners Maryland 175 Main Street Engineering Division Prince Frederick, Md 20678 6 St. Paul Centre Baltimore, MD 21202-6806 James P. Bennett, Esquire Counsel Kristen A. Burger, Esquire Baltimore Gas and Electric Company Maryland People's Counsel P.O. Box 1475 6 St. Paul Centre :
Baltimore, MD 21203 Suite 2101 Baltirnore, MD 21202-1631 Jay E. Silberg, Esquire
- Shaw, Pittman, Potts and Trowbridge Patricia T. Bimie, Esquire 2300 N Street, NW Co-Director Washington, DC 20037 Maryland Safe Energy Coalition P.O. Box 33111 Mr. Bruce S. Montgomery, Di ector Baltimore, MD 21218 ,
NRM ~
Calvert Cliffs Nuclear Power Plant Mr. Loren F. Donatell I 1650 Calvert Cliffs Parkway NRC Technical Training Center Lusby, MD 20657-4702 5700 Brainerd Road '
Chattanooga, TN 37411-4017 Resident inspector Mr. Charles H. Cruse c/o U.S. Nuclear Regulatory Vice President- Nuclear Energy Commission . Baltimore Gas and Electric Company P.O. Box 287 Calvert Cliffs Nuclear Power Plant St. Leonard, MD 20685 1650 Calvert Cliffs Parkway ,
Lusby MD 20657-4702 Mr. Richard 1. McLean, Manager Nuclear Programs Power Plant Research Program Maryland Dept. of Natural Resources Tawes State Office Building, B3 Annapolis, MD 21401 Regional Administrator, Region i U.S. Nuclear Regulatory Commission 475 Allendale Road -
King of Prussia, PA 19406 1
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HARD COPY Docket File -
PUBLIC PDl-1 R/F
' A Dromerick OGC ACRS cc: Ucensee & Service List (with all enclosures)
E-MAIL (w/ encl.1 only)
. S. Collins /R. Zimmerman B. Boger
- J. Zwolinski
- S. Bajwa S. Uttle T. Martin (e-mail to SLM3)
- John Tsao Emmett Murphy Robert Hermann
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List of Attendees Baltimore Gas and Electric Company l 1
December 2.1998 Name .
'Oroanization -
Alexander W. Dromerick NRR/DRPE/PDI-1 James P. Williams BGE/ DEI Getachew Tesfaye BGE Elliott Flick 'BGE l Edward P. Kurdziel ABB-CE !
David Stepnick ABB-CE I John P. Lareau ABB-CE 1
. Stewart Magruder NRR/DRPM John Tsao NRR/EMCB Emmett Murphy NRR/DE/EMCB l Robert Hermann NRR/DE J i
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1 I
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ALLOY 800 SLEEVE PRESENTATION BGE/NRC MEETING AGENDA - DECEMBER 2,1998 l 1
0 INTRODUCTION GETACHEW TESFAYE BGE O REPAIR OPTIONS ELLIOT FLICK BGE O ALLOY 800 SLEEVE ED KURDZIEL ABB i
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- DESIGN CONCEPT
- INTRODUCTION l
SUMMARY
OF RESULTS l
- ACCEPTANCE CRITERIA l
- INSTALLATION PROCESS
- NDE
- CORROSION
- MECHANICALTESTS
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- STRUCTURAL ANALYSIS
- PROCESS VERIFICATION
- EFFECTS ON OPERATION
SUMMARY
0 OPEN DISCUSSION ABBlBGEINRC Enclosure 2
Steam Generator Tube Sleeve Comparison l
Welded Sleeve Alloy 800 Sleeve Nickel PIating
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Installation Rate 25/ day 75/ day 16/ day ;
Sleeve Cost High Low Moderate Waste Cost N/A N/A High ;
Dose Moderate Low Mod'erate Tube Cleaning Brush Abrasive / Brush Brush Method t Vertical Range TSP-3 Full Full l Repair / Inspection Difficult Moderate Difficult Repair Above No No Yes Heat Treatment Yes No No i
Leak Tightness Yes No Yes Creep No No Concern i
Tube Stress Moderate Low None NRC Topical Approved Submitted Submitted 1
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ALLOY 800 MECHANICAL SLEEVE OVERVIEW u .d n,f.l T December 2,1998 '
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ALLOY 800 .
- MECHANICAL SLEEVE OVERVIEW ;
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ALLOY 800 SLEEVE
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PURPOSE OF PRESENTATION !
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E Identify CRITICAL issues
+ Leak Limiting Design i
+Use ofIncoloy 800 ,
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a Summarize qualification work & licensing tre jg report
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LICENSING REPORT 4
m Introduction m Summary of Results i a Acceptance Criteria j i
a Installation Process Description i
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ALLOY 800 SLEEVE DESIGN CONCEPT i
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- a Leak Limiting Design 1
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a Differential Thermal Expansion i
+ Incoloy 800 > Inconel 600 E Low Residual Stress in Tube (<.5% strain) j:
a No Heat Treatment Requirements f'
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i ALLOY 800 SLEEVE DESIGN COKCEPT e All Aspects of Sleeve Bounded by Previous Experience
+ Smaller Tube Expansion i
+ No Weld or PWHT .
+ Roll Joint Equal to TIG Sleeve
+ Inspection Less Difficult
!n!! + ExceIIent Corrosion History of Alloy 800 4 .. ..i
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-l ALLOY 800 SLEEVE i DESIGN CONCEPT i
f a Advantages To The Industry i
+ Holds Potential to be a Safe, Cost Effective Repair
+ Installation Rate and Cost Comparable to Plugging
+ Flow Margin Reduction ~3% of Plugging t i
+ Life of Plant Repair h)i q
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. ALLOY 800 SLEEVE DESIGN CONCEPT a Tihange 2 Management Report About Steam Generator Tube Repair Methods
+ "This sleeve is qualified to the ASME Code for a maximum lifetime of 40 years" p
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ALLOY 800 SLEEVE DESIGN COKCEPT Plant S/G Type Year Exp. Joint Location Total Tihange 3 E Series 1995 0.1-0.2% 2 x44 mm T/S 20 Kori i Series 51 1996 2.0-2.5% 2 x 44 mm T/S 1205 Tihange 3 E Series 1996 0.1-0.2% 2 x 44 mm T/S 104 Tihange 2 Series 51M 1997 0.1-0.2% 6x8mm T/S 10 Krsko D Series 1998 0.1-0.2% 6x8mm T/S & TSP 135 13 j
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. ALLOY 800 SLEEVE INTRODUCTION .
a Generic Licensing Report No. CEN-633-P t a Licensing report provides information to support a technical specification change u Two types ofleak limiting sleeves
+ Expansion Transition Zone (ETZ) i + Egg Crate Support (ECS)
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ALLOY 800 SLEEVE
SUMMARY
OF RESULTS u Leak Limiting Repair
+ Leak rate is small allowing a large number of sleeves to be installed
+ Structural repair per ASME Section III aNDE -
+ VT for tube preparation jj! + ECT per Appendix H
!. j u Life of Repair Qualification
!9 yi (1! + ABB TIG welded joint corrosion history j{ lj + Alloy 800 European corrosion history
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ALLOY 800 SLEEVE
SUMMARY
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a Sleeve meets the following requirements:
+ Designed, analyzed & tested per Section III of ASME Code -
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+ Incoloy 800 material procured per ASME Sections II and III with stricter property tolerances per s ABB-CE material purchasing specification lit yy + Installation per Section XI of ASME Code
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ALLOY 800 SLEEVE ACCEPTANGE CRITERIA m Sleeve / tube structuralintegrity
+ Confirmed by analysis & tests a Corrosion Resistant
+ Confirmed by tests & experience E NDE sufficient to show structural adequacy
[ + Appendix H qualification n
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ALLOY 800 SLEEVE ACCEPTANGE CRITERIA a Limit leakage during normal operating and accident conditions
+ Low leakage rates
+ Allowable leakage established by user technical specifications 2
+ Maximum number ofinstalled sleeves based on I above limits
' 'i , a Sleeve effect on system flow rate & heat transfer is
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ALLOY 800 SLEEVE INSTALLATION PROCESS DESCRIPTION i
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a ETZ Sleeve - Design Concept i
+ Up to 25"in length l
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+ Spans defects at ETZ (top of T/S) i l + Fully inspected with ECT
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+ Hydraulic expansion near upper end l
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ALLOY 800 SLEEVE .
INSTALLATION PROCESS DESCRIPTION a ETZ Sleeve -Installation Steps
+ Mark tube end '
+ Condition /VT tube ID Ry <10 microns through process control 100% visual inspection using micro camera 1
(surface absent of axial scratches) k,II; + Insert / Expand sleeve
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ALLOY 800 SLEEVE INSTALLATION PROCESS DESCRIPTION e
+ Up to 20"in length
+ Spans defects at supports
+ Fully inspected with ECT-
+ Hydraulic expansion near upper and lower end l-r 1
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ALLOY 800 SLEEVE INSTALLATION PROCESS DESCRIPTION t t
a ECS Sleeve -Installation Steps l
+ Mark tube end
+ Condition /VT tube ID
+ Insert / Expand sleeve -
6 expansions at each end
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i a VisualTesting of tubeID to confirm:
+ Completion of the surface conditioning process i
+ Absence of axial scratches in area of hydraulic expansion .
a ECT technique
+ Presence and location of all the expansions
- 9 + Absence of defects in pressure boundary portion 11 of the sleeve and tube my >.
.::!jit + Exceeds Appendix H. requirements i -
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ALLOY 800 SLEEVE CORROSIO:N u Corrosion assessment of sleeve / tube based on:
+ Historical performance of Alloy 800 S/G tubes, rolled tube plugs and sleeves
+ European-based corrosion tests on Alloy 800 sleeve samples
+ TIG sleeve corrosion program I
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+ ABB corrosion tests on Alloy 800 sleeve samples
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O ALLOY 800 SLEEVE CORROSION us Historical performance of tubes, plugs and sleeves
+ Incoloy 800 used as steam generator tube material in Europe with success at operating temperatures up to 6180F I
+ Recent steam generator replacements in Europe
, with Incoloy 800 at Doel, Almarez and ASCO.
M@as + Incoloy 800 mechanical plugs in service in Europe
+ Incoloy 800 sleeves installed in Kori, Tihange and g{jfjj;!jf;j Krsko. Plus Point inspections aft ^er i fuel cycle at ff.i ,
Tihange 3 and Koriindicated no degradation of l Ej!!}[gg"ij the sleeve or tube hydraulic expansion. l e te x j
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ALLOY 800 SLEEVE CORROSION 9 E European-Based Corrosion Tests
+ Caustic corrosion tests performed by Laboreiec for Tihange 3
+ Goal for sleeve joints to last 3 cycles
+ Roll Transition Zone baseline specimens t
represent one cycle oflife
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ALLOY 800 SLEEVE STRUCTURAL ANALYSIS a Analysis per the requirements of:
+ Section III of ASME Code
+ 10CFR50 Appendix B a Normal Operating and Faulted conditions considered l m Sleeve wall degradation per Reg Guide 1.121 1
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+ ~55 % -
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%9' a Sleeved tube vibration ...
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.i ALLOY 800 SLEEVE PROCESS VFsRIFICATION i
t a Tube Conditioning Qualification
+ Performed for:
Surface preparation
- Elimination ofloose particles 1
Elimination of axial scratches
+ Tests on clean, air oxidized and autoclave tubing
% + 100% video verification
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ALLOY 800 SLEEVE PROCESS VERIFICATION a Expansion Qualification
+ Three key variables:
Number of expansions Axial length of each expansion Diametrical extent Y: + Computer-controlled expansion h
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Sleeve & tube yield considered l WM } Sleeve / tube contact monitored.-
l : jj j Load / deflection curve generated in real time t
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ALLOY 800 SLEEVE PROCESS VERIFICATION a Rolled Joint Qualification .j
+ Sleeve rolled joint based on Incoloy 800 plugs
+ Computer controlled, based on torque i
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' 1 ALLOY 800 SLEEVE EFFECTS ON, OPERATION !
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m Heat transfer effects:
- + Negligible ,
a Primary system flow rates:
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+ ~ 30 sleeves / plug -
m Potential for leakage during cold system hydro test q.. -
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SUMMARY
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a Sleeve is designed and tested to applicable ASME sections a Based on test programs (mechanical, corrosion, NDE and process verification): t
+ Sleeve meets all de. sign criteria a Low leakage rates
.,j S m ABB Incoloy 800 sleeve is a safe and cost effective g.c a.
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