ML20134J878
| ML20134J878 | |
| Person / Time | |
|---|---|
| Issue date: | 02/06/1997 |
| From: | Birmingham J NRC (Affiliation Not Assigned) |
| To: | Matthews D NRC (Affiliation Not Assigned) |
| References | |
| NUDOCS 9702120385 | |
| Download: ML20134J878 (13) | |
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UNITED CTATES NUCLEAR REGULATORY COMMISSION f
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February 6, 1997 1
MEMORANDUM T0:
David B. Matthews, Chief Generic Issues and Environmental Projects Branch Division of Reactor Program Management Office of Nuclear Reactor Regulation FROM:
Joseph L. Birmingham, Project Manager Generic Issues and Eny' onmental Projects Branch I
M rogram Man %,/'n b Division of Reactor ageme Office of Nuclear Reactor Regulation j
l
SUBJECT:
SUMMARY
OF JANUARY 28, 1997, MEETING WITH B&W OWNERS GROUP AND FRAMATOME TECHNOLOGIES ON PLANS FOR ALTERNATE REPAIR CRITERIA l
FOR INTERGRANULAR ATTACK On January 28, 1997, representatives of the B&W Owners Group (B&WOG) and Framatome Technologies (Framatome) met with U.S. Nuclear Regulatory Commission staff to present information about plans for alternate repair criteria (ARC) j for intergranular attack (IGA) in once through steam generators.
The Owners Group and Framatome presented an overview describing the need for ARC, the approach to be used, the regulatory framework within which ARC could be used, and a tentative schedule for implementation. The overview was followed by a discussion of the technical basis for the ARC to be used for IGA, supporting programs and projects, results of tube pulls with various defects, and the rer,ults to date of a probability of detection study. Additional details are in Attachment 2 which is the slides presented at the meeting.
During the course of the presentations, the industry representatives indicated that the proposed ARC will be based, in part, on the draft steam generator tube integrity rule and regulatory guide. The NRC staff commented that because the draft rule and regulatory guide are not yet finalized, guidance on risk-based aspects of the rule including severe accidents is subject to change until issued.
The staff also indicated that, in order to expedite the review process, it would be amenable to reviewing the Owners Group's results as portions became available. is a list of the meeting attendees and Attachment 2 is the slides fl presented by the Owners Group and Framatome.
Attachments: As stated cc w/atts:
See next page f,7-;t9
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19 A (W t 3DN gNM 9702120385 970206 AG hnY PDR TOPRP ENVBW
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i B&W Owners Group Project No. 693 i
Mr. Robert W. Keaten, Chairman Mr. W. W. Foster, Chairman B&WOG Executive Committee B&WOG Steering Committee Vice President & Director of Director of Safety Assurance Technical Functions Duke Power Company GPU Nuclear Corporation Oconee Nuclear Station One Upper Pond Road PO Box 1439 3
,i Parsippany, NJ 07054 Seneca, SC 29679 j
Mr. R. B. Borsum, Manager Mr. J. H. Taylor, Manager Rockville Licensing Operations Licensing Services l
Framatome Technologies, Inc.
Framatome Technologies, Inc.
1700 Rockville Pike, Suite 525 P.O. Box 10935 Rockville, MD 20852-1631 Lynchburg, VA 24506-0935 Y
d
V, D. Matthews is a list of the meeting attendees and Attach:nent 2 is the slides presented by the Owners Group and Framatome.
Attachments: As stated cc w/atts:
See next page i
Distribution: Mtg. w/B&WOG dapuary 28. 1997 Central File (w/atts 1&2)
PUBLIC PGEB r/f OGC ACRS E-Mail (w/att 1)
F. Miraglia R. Zimmerman A. Thadani T. Martin D. Matthews B. Sheron G. Holahan B. Boger J. Mitchell G:\\JLB\\01-28MTG. SUM /fl.,f DOCUMENT NAME:
'g C/PGEh:h 0FFICE PCEB:DRPM de SC/PREk:N t
n NAME JBirminghad.:sw FAkstkeNcz DMatthTs DATE 02/ 4 /97 02k/97 02/[./97 0FFICIAL RECORD COPY 9'7 cRV M BLE c h ig.[g u py
B&W OWNERS GROUP MEETING ATTENDEES JANUARY 28, 1997 N_AM ORGANIZATION A
W MORRIS SAMPLE DUKE POWER BLAKE LOWERY DUKE POWER W K DAVIS DUKE POWER DEWEY ROCHESTER DUKE POWER GENE NAVRATIL GPU NUCLEAR RICHARD FREEMAN GPU NUCLEAR MICHAEL SHEPHERD TOLEDO EDIS0N RICH ACKERMAN TOLEDO EDIS0N PATRICK PETERSON FLORIDA POWER JOHN MAKAR FLORIDA POWER LARRY trXTON FLORIDA POWER JOHN IFFITH FRAMATOME JONATHM COBURN FRAMATOME BRIAN HERDICH FRAMATOME JEFF BROWN FRAMATOME J0E BIRMINGHAM NRC\\NRR\\PGEB PHIL RUSH NRC\\NRR\\EMCB TED SULLIVAN NRC\\NRR\\EMCB EMMETT MURPHY NRC\\NRR\\EMCB JACK STR0 SNIDER NRC\\NRR\\EMCB JOHN TSA0 NRC\\NRR\\EMCB STEPHANIE C0FFIN NRC\\NRR\\EMCB Attachment I
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B&V1 OWNERS GROUP i
NRC PRESENTATION
[
PLANS FOR ALTERNATE REPAIR CRITERIA FOR INTERGRANULAR ATTACK JANUARY 28,1997 j
=
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B&W OWNERS GROUP / NRC MEETING j
SUMMARY
AND OBJECTIVES
]
I
- SUMMARIZE B&WOG PLANS FOR ALTERNATE l
REPAIR CRITERIA FOR INTERGRANULAR ATTACK
- SUMMARIZE PROGRESS OF B&WOG PROBABILITY OF DETECTION PROJECT
- OTHER PLANS
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4 r
ALTERNATE REPAIR CRITERIA FOR IGA l
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- OBJECTNE
- PROPOSEDWORKSCOPE h
- SCHEDULE
- PRESENTSTATUS
- DECISION POINTS / RELATED ISSUES GENERIC ARC FORIGA
- PURPOSE
- Develop Technical Basis for Alternate Repair Criteria for Intergranular Attack
- NEED FOR ARC
- Most Significant Degradation Mechanism Currently Affecting OTSG's
- Recent Tube Pull Results Confirm IGA
- Historically Difficult to Depth Size by NDE
- 40% TW is Overly Conservative for Some Morphologies (Un-necessary Plugging) 4
= eammes amaw
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REGULATORY FRAMEWORK FOR PLUGGING CRITERIA I
l
- DRAFT SG INTEGRITY RULE & REG. GUIDE
- Supplernents RG 1.121
- Provides Guidelines for Development of Tube Repair Criteria and NDE Qualification
+ INDUSTRYDOCUMENT(NEI)
- Intended to Provide for Consistent Industry Application of Rule
. GENERIC LETTER 96-05
- Guidelines forimplementing ARC for TSP ODSCC
- General Approach for Probabilistic Criteria DRAFT SG INTEGRITY RULE j
ALLOWS TWO OPTIONS
- Deterministic e Spec 46es Reg. Guide 1.121 Criteria and ASME Code Section M Design Margins
- Probabilistic e Limits Probablitty of Tube Rupture and Accident Laekage Exceeding Allowebles i
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= commes ename
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l PROPOSED APPROACH FOR IGA PURSUE PROBABILISTIC CRITERIA
- Avoid Un-necessaryTube Plugging j
= Maximize safe se service Ufe
- Significant OTSG IGA Pulled Tube Database Already Exists
- Initial Data Evaluation Suggests Likely Success I
B&WOG OTSG COMMITTEE SUPPORTING PROGRAMS AND PROJECTS TUBE PULL
- Cooperative B&WOG Effort
- Proactive Tube Sample Removal & Analyses for increased Understanding of OTSG Flaws
- Funded into 1998, Expected to Continue TUBE INTEGRITY
- NDE, Leak & Burst Testing, Destructive Exam of Laboratory Flawed Tube Samples
- Approximately441GASamples
- AllTesting Completed, Being Documented
=
B&WOG OTSG COMMITTEE SUPPORTING PROGRAMS AND PROJECTS
- TUBEPLUGGINGCRITERIA
- Update Tube Integrity Analyses for Revised Loads and Currently Known Flaw Types
- To Be Completed 1997
- OTSG TRENDING REPORT
- Yearly Report
- Compares and Contrasts Experience for All B&WOG Plants
- Identify Emerging Degradation Trends
=
B&WOG OTSG COMMITTEE SUPPORTING PROGRAMS AND PROJECTS
- CHARACTERIZATION OFIGA
- Ongoing Project to identify Most Appropriate NDE Technique for Detection and Sizing oflGA
= PROBABILITY OF DETECTION / HUMAN FACTORS
- Determine Realistic POD Based on Field Analysis
- Uses Pulled Tube Database
.-=
SUMMARY
OF B&WOG TUBE PULLS SUPPORTING ARC FOR IGA
- TUBE PULLS
- CR-3 (1992,94)
- ANO-1(1978,82,84,96)
- TMl-1 (1982,86)
- OCONEE 1(1994)
- OCONEE-2 (1988,96)
- OCONEE 3(1993)
EXISTING DATABASE
- Approximately 118 Samples of Volumetric IOA in 26 Pulled Tubes
- Lab Exam in Progress for Additional 6 Tubes WORKSCOPE
- Characterization of Dama2e Mechanism
- Correlate Structural and Leakage Performance with NDE Measured Parameter
- Determine NDE Measurement Uncertainty
- Quantify Growth Rate
- Develop Model to Determine Probability of Burst and Leakage TopicalReport a
4 4
SCOPE OF WORK, CONT'D.
CHARACTERIZE DAMAGE MECHANISM
- Determine Range of Flaw Sizes to be Addressed
- Determine Location in OTSG
- Supported by Existing B&WOG Programs 1
m Tube Pull i
e Tube Pull NDE o Plant to Plant Trending
)
SCOPE OF WORK, CONT'D.
TUBEINTEGRITY ASSESSMENT
=
- Establish Burst Chwacteristics
- Establish Leak Characteristics
- Assess Integrity for Remaining Operational Loads (i.e.,
axial, bending)
- Supporting Programs e Tube Pull e TubeIntegrity e Tube Plugging Criteria
=
SCOPE OF WORK, CONT'D.
1 i
ADDITIONALWORK FOR TUBEINTEGRITY
- Structural Integrity for Non-Burst Conditions s To Be Addressed Analytically
- Leakagelntegrity n Additional Data to Assess Leak Rate & Probatniity of Leak n Sample Fabricatkm (Laboratory) e Hot Leak Testing MAtl SCOPE OF WORK, CONT'D.
NDE E"ALUATION
=
- Determine Best NDE Technique / Parameter
- Probability of Detection
- NDE UncertaintyI Human Factors
- Supporting Programs a Tube Pull n Tube Integrity e Characterizaticn of IGA e 900 i Human Factors o Probe Wear
- AdditionalWorkRequired a Combine and Correlate Data to Structural and Leakage WYY
=
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4 SCOPE OF WORK, CONT'D.
4 j
GROWTH RATE
=
j
- Based on ECT Data Re-Analysis e Based on ECT Database on in4ervice Tubes d
a Normalize Calibrabons a Based on Chosen NDE Parameter
- Evaluate Over At Least Three Cycles
- Incorporate Data From All Plants as Available
- Verify Consistent Plant-to-Plant Behavior i
l
=--
L G fl SCOPE OF WORK, CONT'D.
BURST AND LEAK PROBABILITY MODEL
- Statistical Approach Consistent with Prior ARC Submittals
- Compute Probability of Burst and Leakage for a Given Distribution of Flaws
- includes Allowances for NDE Uncertainties
- Ured for Past Cycle Evaluation and EOC Prediction TOPICAL REPORT
- Summarizes Criteria
- Documents Basis (All Previous Tasks)
=
l PRESENT STATUS CHARACTERIZATION dF DAMAGE MECHANISM
\\
- Completed, Documented j
TUBE INTEGRITY-8TRUCTURAL
- Analysis in Progress TUBEINTEGRITY-LEAKINTEGRITY
- Specification for Lab Samples in Prog ess PROBABILISTic MODELDEVELOPMENT
- In Progress POD
- In Progress INDUSTRY / NRC INTERFACE INVOLVEMENT OF EPRI / INDUSTRY ARC COMMITTEE
- Maintain Consistency with Other Industry Submittais
- Plan to Present Technical Basis to EP'll ARC Committee for independent Review Prior to Submittal to NRC NRCINTERFACE
- Periodic Meetings / Reviews Desired i
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SCHEDULE TOPICAL REPORT PREPARED FOR UTILITY REVIEW BY LATE 1997 i
TOPICAL REPORT SUBP8'TTED TO NRC BY END OF
=
1997 FIRST POSSIBLE USE SPRING 1998
+
=__
i
l NRC MEETING ON ARC
= BWOG POD Project Plan Presented to NRC in i
August 1996
. Eddy Current Analysis Performed in September 1996
- Progress of POD Project to Date j
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=_
PURPOSE OF PROJECT POD Can Be Used for Many Purposes a
- Alternate Repair Criteria
- Operating Cycle Duration
- Examination Scope Requirements
- Damage Spec!fic Management
- Draft NRC Rulemaking Determine Appropriate POD Numbers
- Voltage Relation
- Depth Relation
- Damage Mechanism Relation
=
1 d
TEST STRUCTURE
= Analysis Structure
- Typical Primary / Secondary / Resolution Analysis
- Ten OTSG Production Analysts and 5 Resolution i
Analysts
- Total of S independant Analysis Groups
- Analyst Selection
- Random Selection based on Availability
- Spectrum of Experience i
- All QDA Certified i
- Duke, Rockridge and FTl
- mm m,.w TEST STRUCTURE (cont)
- AnalystTraining and Testing
- Common OTSG Analyels Guideline
- Analysis Guideline Training
- Stressed Calling individual Indications In' Regions of Multipleindications
. Data Evaluation Protocol
- Individual Analyst Setup for Each Cal Group
- Normal Field Analysis Process independant Primary and Secondary Analysis
- Approximately 1 Week for Analysis Phase
- Simulated Field Production Analysis Pressure
4 1
ECT DATA USED Pulled Tube Data
- POD is based on Pulled Tube Samples Only
- True Depth Based on Metallography
- Data from Multiple OTSG Plants
- Bobbin Coll Eddy Current Data Only Flaw Mechanisms in Data Set i
- Volumetric intergranular Attack (IGA)
- AxialIGA / SCC
- Erosion 1 Corrosion
- Wear
=
ECT DATA USED (cont)
Summary Of Eddy Current Data
- Datt bets Were Constructed from Original Field Cal Groups where possible
- included 169 indications with DE results '
= Volumetric IGA 118 m AxialIGA / SCC 33 j
= Erosion 1 Corrosion 7
m Wear 11
- Total of 796 Tubes
- There were 26 Pulled Tubes with DE results
- Representative spectrum of other signals
- Approximately 65 % NDD tuben,
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I POD RESULTS VOLURETRC GA O'.TRALL macaru we uxusrc
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0.s 0.8 POD
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0.4
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0.2
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0 20 40 00 80 100 1
DLPTH(% TW)
= emanas amow POD RESULTS VOLTAGE POD f
va ernuena 1
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0.8 -
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Oe pod g..
04 0.2
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a RESULTS EVALUATION
= POD Evaluation
- SSPD Was Not Used due to Data Format - No 'C' Files Supplied
- Detections Tabulated versus Max Depth, Average Depth, Voltage, and Burst Pressure
- POD Evaluated by discrete (EPRI Guidelines) and logistic eMrossion (NUREG / CR4227) methods
= Performance Evaluation
- Main Evaluation is Resolution Performance for Five Analysis Groups
- POD Calculated for each Defect Mechanism
- POD Project Statistics Similar to Field With a Few Exceptions
=
RESULTS EVALUATION
= POD vs Field Analysis
- Avcage Number of Calls in POD Analysis are consistent with Field Analysis
- POD Analysis had More calls in Several dal Groups due to the Evolution of Recording Techniques
=ommonsamour
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POD RESULTS LOGISTC REGRESSON POD Amal IGA 1 SCC M RESOLUTIONS
. - AW DEN ) f,,,,
08 fi POD 04 f-0.2
./
0 -$ /
0 20 40 60 80 100 AVERAGE DEPTH (% TW)
0.8
..g...
0.6 POD 04 02 I I 7""
0 0
20 40 60 80 100 DEPTH (% TW)
=enumesemeur
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I POD RESULTS l
l LOCHETC REGRESSON POO WhenmHcIGA ALLRESOLLmONS 1
f'
,..d 08
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POD 04 0.3
' ' [ -.-- au suso 0
20 40 60 80 100 DEPTH (% TW)
= emmensnumer POD RESULTS RURST PRESSURE POD nem m ecc
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- g.
0.s 0.6 POD 04
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- c son amo ese sus me oms emo ines tune BURST TEST PRESSURE (PSI)
- esmoso summe
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TUBE-TO-TUBESHEET ROLL TRANSITIONS ALTERNATIVES TO ADDRESS PWSCC NDE RESULTS
- AxlalIndications in Hat Log Transitions at Four Plants
- Confirmed via Tube Pull at Davis Besse a 1 Tube, Spring 1996
- Laboratory Exam of Additional Tubes in Progress OPTIONS BEING CONSIDERED BY B&WOG i
- Tubesheet Re-roll a NowUnderDevelopment j
- Alternate Repair Criteria a Besed on indicated Crack L.ength from NDE
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POD RESULTS LOGesTC REGRESSION POD j
Wear-ALL RESoumONS i
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=_
SUMMARY
Preliminary Results Indicate that Logistic Regression for Resolution Analysis Should be Used ARC Project Will Determine the Correct
=
Parameter for Defect Severity Perform Additional Evaluation of Data for Axial IGA / SCC, Erosion / Corrosion, and Wear