ML20210U052

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Summary of 860922 Meeting W/Util Re once-through Steam Generator Tubes to Be Pulled During Cycle 6 Outage.Util Handouts & List of Attendees Encl
ML20210U052
Person / Time
Site: Three Mile Island Constellation icon.png
Issue date: 09/30/1986
From: Thoma J
Office of Nuclear Reactor Regulation
To: Stolz J
Office of Nuclear Reactor Regulation
References
NUDOCS 8610090391
Download: ML20210U052 (12)


Text

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September 30, 1986 O 'en d - C /s po_ >-

MEMORANDUM FOR: John Stolz, Director PWR Project Directorate #6 Division of PWR Licensing-B FROM: John Thoma, Project Manager PWR Project Directorate #6 Division of PWR Licensing-B

SUBJECT:

MEETING

SUMMARY

OF OTSG SELECTION CRITERIA On Monday, September 22, 1986, GPUN met with the NRC staff to discuss criteria for selecting 0TSG tubes to be pulled during the Cycle 6 outage. Meeting attendees are provided in enclosure (1). Enclosure (2) contains the handouts provided by GPUN. At the end of the meeting, GPUN was asked to provide-specific ECT history data on nine tubes from which at least three will be selected for pulling and laboratory analysis.

ORIG!flAL S10'iED BY j John Thoma, Project Manager PWR Project Directorate #6 Division of'PWR Licensing-B

Enclosures:

As stated

'cc w/ enclosures:

See next page i

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MEETING

SUMMARY

DISTRIBUTION Licensee: GPU Nuclear Corporation

  • Copies also sent to those people on service (cc) list for subject plant (s).

i NRC PDR L PDR PBD-6 Rdg JStolz JThoma TPoss RWeller 0GC-MNBB 9604 Edordan BGrimes ACRS-10 NRC Participants RWright LMarsh KWichman CYCheng DCrutchfield JRajan

^

t 09/22/86 OTSG Tube Selection Criteria NAME ORGANIZATION John 0. Thoma NRC/NRR/PWR-6 Thierry Ross _

NRC/NRR/PWP-6 Julien Abramovici GPUN Rick McGoey- GPUN LICENSING Shelley Kowkabany GPUN LICENSING Scott Giacobbe GPUN - MATERIALS ENGINEERING Robert Wright NRR/PWR-B/EB L. B. Marsh NRR/PWR-B/EB Keith Wichman NRR/PWR-B/EB C. Y. Cheng NRR/PWR-B/EB Dennis Crutchfield NRR/PWR-B Jai Rajan NRR/PWR-B/EB d

9 LABORATORY ANALYSIS OF TMI-1 OTSG TUBES GPU NUCLEAR CCRPORATION SEPTEMBER 22, 1986 i

TUBE PULL PROCESS

1. TUBE RELAXATION (TIG)
2. TUBE CUT (WHIP CUTTER)
3. SEAL WELD REMOVAL
4. TUBE PULL AND SECTION AS NECESSARY

8 TUBE SELECTION CANDIDATE IDENTIFICATION:

1. IN SERVICE -0TSG A
2. GOOD SIGNALS (20-50% TW)

CANDIDATE EVALUATION:

1. IGA POTENTIAL - MULTIPLE INDICATIONS IN CLOSE PROXIMITY
2. " GRAIN DROPOUT"- DECREASE IN T.W. CALL WITH INCREASED SIGNAL AMPLITUDE
3. T.W. EXTENT APPROACHING PLUGGING LIMIT
4. REMOVAL CAPABILITY - ADEQUATE SAMPLE LENGTH
5. SCREENED INDICATIONS - UNCONFIRMED BY 8 X 1 CANDIDATES IN ORDER OF PREFERENCE *:

A-141-3 /( 1, 2, 5)

A-8-45 (1)

A-35-83 (3, 4)

  • SUBJECT TO REVISION BASED ON 6R EDDY. CURRENT EXAMINATION 4

,. j J

,s LABORATORY ANALYSIS - 3 TUBES 1

i OBJECTIVES:

1. CORRELATE FIELD EDDY CURRENT DATA 4

WITH DESTRUCTIVE ANALYSIS RESULTS

2. FURTHER EVALUATE EDDY CURRENT SENSITIVITY AND ACCURACY
3. DETERMINE EXTENT AND TYPE OF DEGRADATION IN EACH TUBE
4. CHARACTERIZE SURFACE FILM OXIDE BY MICROANALYTICAL TECHNIQUE 1

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4 s LABORATORY ANALYSIS - 3 TUBES 1 GENERAL REQUIREMENTS GPUN: 1. PERFORM IN GENERATOR EDDY (ONSITE) CURRENT INSPECTION

2. PERFORM OUT OF GENERATOR EDDY CURRENT INSPECTION EITHER ONSITE OR AT LABORATORY LABORATORY: 1. ANALYZE AT LEAST THREE (3) EC INDICATIONS (OFFSITE) AS IDENTIFIED BY GPUN.
2. DOCUMENT THE AS-RECEIVED CONDITION OF THE TUBE SAMPLE BY PHOTOGRAPHY.
3. PERFORM EDDY CURRENT TESTING OF TUBE SAMPLES IN ACCORDANCE WITH GPUN PROCEDURES.
4. MACROSCOPICALLY CHARACTERIZE THE SURFACE TOPOGRAPHY AND MORPHOLOGY IN THE IMMEDIATE VICINITY OF EACH EDDY CURRENT (EC)

INDICATION.

5. MEASURE CIRCUMFERENTIAL AND/OR AXIAL EXTENT OF EACH CRACK, PIT OR OTHER DEFECTS ON TUBE SECTIONS IDENTIFIED BY GPUN FOR METALLURGICAL EVALUATION.
6. ANALYZE CRACK FACES AND CORRODED AREAS FOR CONTAMINANTS BY ESCA AND AUGER.

'O

, SAMPLE SECTIONING

1. SECTIONING SHALL BE DONE TO LIMIT

. DISTURBANCE OR CONTAMINATION OF THE EDDY CURRENT INDICATION. CARE SHALL BE TAKEN SO AS NOT TO CUT THROUGH ANY EC INDICATION.

2. INITIALLY, SELECTED TUBE SAMPLES SHALL BE SLIT LENGTHWISE TO EXAMINE THEIR ID SURFACES. PHOTOGRAPHS SHALL BE TAKEN WITH A HIGH-QUALITY CAMERA TO RECORD THE GENERAL CONDITION OF INTERNAL SURFACES. CLOSE UPS SHALL BE TAKEN OF ALL EC INDICATIONS, AS WELL AS CORROSION DAMAGE NOT DETECTED BY ECT.
3. THE INSIDE SURFACE OF EACH TUBE SHALL BE EXAMINED FOR CORROSION DAMAGE (CRACKS AND PITS) USING A STEREO MICROSCOPE. PARTICULAR ATTENTION SHALL BE GIVEN TO THE AREA OF THE SUSPECT DEFECT.
4. THE CIRCUMFERENTIAL/ AXIAL EXTENT OF EACH EC DEFECT SHALL BE MEASURED UNDER A STEREO MICROSCOPE WITH A RECTICLE MARKED OFF IN MILLIMETER OR MIL UNITS AND RECORDED. FOR THOSE INDICATIONS WHICH ARE NOT GOING TO BE ANALYZED BY MICROCHEMICAL METHODS FLUORESCENT DYE PENETRANT TESTING MAY BE USED TO HIGHLIGHT THE DEFECT FOR DIMENSIONING PURPOSE.

P

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. METALLOGRAPHY al M

1. METALLOGRAPHY SHALL BE PERFORMED ONATHREE EC INDICATIONS TO DETERMINE THE SIZE AND CHARACTERISTICS OF EACH INDICATION.
2. METALLOGRAPHIC SPECIMENS SHALL BE GROUND, POLISHED IN SMALL INCREMENTS OF ABOUT 10 MILS OR AS DIRECTED BY GPUN OVER THE ENTIRE LENGTH.0F THE DEFECT. MAXIMUM AXIAL AND RADIAL DIMENSIONS SHALL BE RECORDED FOR EACH INCREMENT. MEASUREMENTS SHALL BE MADE WITH A RECTICLE MARKED OFF IN MILLIMETER OR MIL UNITS.

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  • 'SEM/ MICROCHEMICAL ANALYSES
1. ONE EC DEFECT SHALL BE EXAMINED IN THE SCANNING ELECTRON MICROSCOPE.
2. MICRO-CHEMICAL ANALYSES SHALL BE PERFORMED ON THE SURFACE SCALE AND THE MECHANICALLY OPENED IGA FACES. TECHNIQUES SHALL INCLUDE ENERGY DISPERSE X-RAY ANALYSIS (EDX) FOR ELEMENTAL COMPOSITION OF SURFACE SCALE AND DEPOSITS, AND ELECTRON SPECTROSCOPY (ESCA)

FOR IDENTIFICATION OF CHEMICAL FORM OF ELEMENTS IN SURFACE FILMS ON THE TUBE INSIDE DIAMETER AND IGA FACES.

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PRELIMINARY SCHEDULE - 6R EDDY CURRENT .

INSPECTION AND. TUBE PULL ACTIVITIES NOV.86 DEC.86 JAN.87 FEB.87 1

MAR.87 7 14 21 28 5l 12 19 26 2 9 16 23 30 6 13 20 27 6 13 2C PLANT SHUTDOWN / 1 NOV. Os NOv.

COOLDOWN EDDY CURRENT TESTING / 13 NOV.( l17 DEC.

EVALUATION SUBMIT TSCR INCLUDING 17 DEC.[}l9 DEC.

PRELIMINARY ECT RESULTS FUEL SHUFFLE COMPLETION (SUCCESS ORIENTED SCHEDULE) h JAN. 17 PULL TUBES 20 NOV. R 22 NOV.

PACKAGE / TRANSPORT 22 NOV .026 NOv .

1 LABORATORY ANALYSIS 26 NOV.l l 17 DEC.

PREPARE SUBMITTAL WITH 17 DEC.I l 7 JAN.

PRELIMINARY RESULTS

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