ML18051A678

Notification of 831207 Meeting W/Util in Bethesda,Md to Rept Results of Steam Generator Insp at Plant,Including Depth Determination of Intergranular Attack & Proposed Plugging Criteria

ML18051A678
Person / Time
Site:	Palisades
Issue date:	11/29/1983
From:	Wambach T Office of Nuclear Reactor Regulation
To:	Crutchfield D Office of Nuclear Reactor Regulation
References
NUDOCS 8312020289
Download: ML18051A678 (22)

Text

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November 29, 1983 66cket No.50-255 MEMORANDUM FOR:

Dennis M. Crutchfield, Chief Operating Reactors Branch #5 Division of Licensing FROM:

Thomas V. Wambach, Project Manager Operating Reactors Branch #5 Division of Licensing

SUBJECT:

FORTHCOMINli MEETil'lG lHTH CONSUMERS PmJER CO!--'ifJP.NY Time & Date:

Wednesday December 7, *1 983 10:00 a.rn.

Location:

Rm 220 Landm*1 Building Bethesda, Maryland

Purpose:

To report results of Steam Generator Inspection at Palisades including depth determination of IGA and proposed plugging criteria.

Participants:

Consumers Power Company O. VandeWalle et. al.

MRC 13.D. U avi C.E. Cheng L. Frank H. Conrad cc:

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8312020289 831129 PDR ADOCK 05000255 p

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c. McCracken E. 1*1urphy D. Crutchfield T. Wambach Original signed by n10mas V. ifombach, Project Manager Operating Reactors Branch #5 Division of Licensing DSU seof

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NRG FORM 318 (10-80) NRCM 0240 OFFICIAL RECORD COPY USGPO: 1981-335-960 _j

UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 November 29, 1983 Docket No.50-255 MEMORANDUM FOR:

Dennis M. Crutchfield, Chief

, Operating Reactors Branch #5 Division of Licensing FROM:

Thomas V. Wambach, Project Manager Operating Reactors Branch #5 Division of Licensing

SUBJECT:

FORTHCOMING MEETING WITH CONSUMERS POWER COMPANY Time & Date:

Wednesday December 7, 1983 l 0:00 a.m.

Location:

Rm 220

Purpose:

Pa rt i ci pants:

Landow Building Bethesda, Maryland To report results of Steam Generator Inspection at Palisades including depth determination of IGA and proposed plugging criteria.

Consumers Power Company D. VandeWalle et. al.

NRC B.D. Liaw C. E. Cheng L. Frank H. Conrad C. McCracken E. Murphy D. Crutchfield T. Wambach

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Thomas V. Wambach, Project Manager Operating Reactors Branch #5 Division of Licensing cc:

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Mr. David J. VandeWalle cc M. I. Miller, Esquire Isham, Lincoln & Beale Suite 4200 One First National Plaza Chicago, Illinois 60670 Mr. Paul A. Perry, Secretary Consumers Power Company 212 West Michigan Avenue Jackson, Michigan 49201 Judd L. Bacon, Esquire Consumers Power Company 212 West Michigan Avenue Jackson, Michigan 49201 James G. Keppler, Regional Administrator Nuclear Regulatory Commission, Region III 799 Roosevelt Road Glen Ellyn, Illinois 60137 Township Supervisor Covert Townshi Route l, Box 10 Van Buren County, Michigan 49043 Office of the Governor (2)

Room l - Capitol Building Lansing, Michigan 48913 Palisades Plant ATTN:

Mr. Robert Montross Plant Manager Covert, Michigan 49043 U. S. Environmental Protection Agency Federal Activities Branch Region V Office ATTN:

Regional Radiation Representative 230 South Dearborn Street Chicago, Illinois 60604 Resident Inspector c/o U. S. NRC Palisades Plant Route 2, P. O *. Box 155 Covert, Michigan 49043 Lee E. Jager, P.E., Chief Environmental and Occupational Health Services Administration Michigan Department of Public Health 3500 N. Logan Street Post Office Box 30035 Lansing, Michigan 48909

NOV 8 1983 MEMORANDUM FOR:

Richard H. Vollmer, Director Division of Engineering THRU:

William V. Johnston, Assistant Director Materials, Chemical & Environmental Technology FROM:

B. D. Liaw, Chief Materials Engineering Branch

SUBJECT:

MEETING WITH CONSUMERS POWER COMPANY ON OCTOBER 25, 1983 TO DISCUSS INSPECTION OF PALISADES STEAM GENERATORS (VIEWGRAPHS ATTACHED)

The agenda covered the results of ongoing steam generator tube inspections, plans to complete 100% inspection of the tubes, proposed tube pulling and laboratory investigatory actions.

In 1982, circumferential cracks were found in two leaking tubes when 4 x 4 differentially linked surface riding pancake coil eddy-current probes were used.

In the present ongoing inspections, of which ~ 10% of the inspection data has been analyzed, approximately 26 tubes with similar circum-ferential cracks have been found.

Two other types of flaws of unquantifiable depth have also been found throughout the steam gene-rators.

Tube inspections have been expanded to include 100% of the steam generator tubes using the 4 x 4 technique supplemented as needed by multifrequency and rotating pancake coils to quantify flaw depth.

Circumferential cracks identified by the 4 x 4 probe, irrespective of depth, will be plugged.

Disposition of the remaining tubes with other type flaws will await the laboratory examination results of pulled tubes which will undergo ECT correlations with destructive metallurgical examinations.

Chemical analyses will also be conducted to determine causative species responsible for the observed degradation.

Corrective actions will be based on the results of the above investi-gations and others, such as in-situ strength testing of tubes as a backup to ECT depth determinations.

NOV 8 1983 Richard H. Vollmer 2 -

Tube pulling will commence before the eddy current testing is complete with laboratory results expected sometime in January 1984.

Enclosure:

Vugraphs cc:

W. Johnston

8. D. Liaw C. Cheng L. Frank H. Conrad V. Benaroya DISTRIBUTION:

Central File MTEB Reading File Pa 1 i sades File DE: MTEB LFrank:aj 10/

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DE:~U CC hen 10/7}6/ 3 Original sigr.ed by B. D. Liaw B. D. Liaw, Chief Materials Engineering Branch D~~

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lV\\ !83 oE\\JJ~~ET WJohnston l~/ ~/83

AGENDA CONSUMERS POWER COMPANY MEETING WITH NRC PALISADES PLANT STEAM GENERATOR PERFORMANCE OCTOBER 25, 1983 INTRODUCTION AND OVERVIEW WJBECKI us INSPECTION RESULTS AND PLANS JSJANDOVITZ TUBE PULLING AND ANALYSIS JRSCHEPERS LICENSING ACTIONS DJVANDEWALLE

OVERVIEW

1.

IN 1982 CPCO MADE A COMMITf1ENT TO* DEVELOP AN EDDY CURRENT PROBE THAT COULD SEE CRACKING IN THE LI-BEND REGION

2.

WE USED THE COIL WE DEVELOPED TO DO THE 1983*

INSPECTION.~ND HAVE SEEN Ml\\NY INDICATO~S IN THE PALISADES STEAM

3.

WE HAVE FORMED A TASK FORCE TO I~VESTIGATE AND MAKE RECOMMDmATIONS TO CPCO MANAGEMENT

PURPOSE OF THIS MEETING

1.

TO TELL NRC WHAT WE HAVE FOUND SO FAR

2.

TO TELL NRC WHAT WE ARE DOl~G ABOUT IT

3.

TO OBTAIN A[~ UNDERSTANDIUG OF NRC CONCERNS Al'~D TO UTILIZE Ai~Y EXPERTISE NRC MAY HAVE DEVELOPED

4.

TO OUTLINE WHAT i~RC REVIEWS WE ARE LIKELY TO.

NEED TO RETURN TO POWER AND BEGIN PLANNING THEN

ACTIONS TAKEN BY CPCO

1.

PROCEEDING WITH 100% EDDY CURRENT TEST OF BOTH STEAM GENERATORS USING 4C4 PROBE

2.

PROCEED TO PULL SAMPLES OF TUBING FROM THE STEAM GENERATORS

3.

PROCEED WITH PLANT SAFETY ANALYSIS CALCULATIONS WHICH ARE PARAMETRIC IN THE NUMBER OF STEAM GENERATOR TUBES PLUGGED

4.

DEVELOP THE ECT TECHNOLOGY TO RELIABLY DETERMINE DEPTH OF THE ATTACK

5.

INVESTIGATING IN-PLACE STRENGTH TESTING AS A BACK UP TO ECT DEPTH DETERMINATION TECHNOLOGY

t*

1982

SUMMARY

LEAKAGE OBSERVED IN A STEAM GENERATOR IN lST QUARTER OF 1982 TWO LEAKING TUBES NOTED; FOUND BY SECONDARY SIDE PRESSURIZATION TUBES WERE INSPECTED WITH VARIOUS EDDY CURRENT TECHNIQUES.

FLAWS CHARACTERIZED AS VERY TIGHT CIRCUMFERENTIAL CRACKS.

FLAWS NOT DETECTED WITH BOBBIN STYLE PROBE ADDITIONAL 9% OF TUBES INSPECTED WITH 4x4 PROBE -

STRAIGHT SECTIONS ONLY NO FURTHER INDICATIONS NOTED PLANT WAS RETURNED TO SERVICE Mll083-TF08-NS02

BOBBIN, SFW

.<..5,,

. 'i+

- SFW PROBE

- DIFFERENTIAL MULTI FREQUENCY

- CIRCUMFERENTIAL WINDING 4X4

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N EDDY CURRENT PROBES I

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- DIFFERENTIALLY LINKED

- SURFACE RIDING COILS

- PANCAKE COILS

.187"DIAMETER 11

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- DIFFERENTIALLY LINKED

- SURFACE RIDING COILS

- PANCAKE COILS

.187" DIAMETER e

1983 INSPECTION WASTAGE

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MULTIFREQUENCY BOBBIN PROBE u.lf_ >:S 0 fa 35 - 40% OF THE HL TUBES INSPECTED RESULTS INDICATE ESSENTIALLY ZERO WASTAGE GROWTH DENTING N" 1-rt?~

4 BLOCKED TUBES FOUND - 3 IN BIHL.

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AND 1 IN A/HL PROFILOMETRY PLANNED BUT NOT COMPLETED YET LESS BLOCK~D TUBES IN 1983 THAN IN 1979 AND 1981 SLEEVES INSPECTED WITH SLOW.PULL BOBBIN PROBE AND ROTATING PANCAKE COIL PROBE SLEEVES FOUND OK LOOSE PARTS PERIPHERY TUBES INSPECTED FROM TOP OF TUBESHEET TO FIRST SUPPORT INSPECTED WITH 100 Kz ABSOLUTE MODE BOBBIN TECHNIQUE NO INDICATIONS OF WEAR NOTED CIRCUMFERENTIAL CRACKS 3% SAMPLE IN A AND B HOT LEG <INCLUDING U-BENDS) 4c4 TECHNIQUE USED SEVERAL INDICATIONS NOTED, EXPANDED TESTING INITIATED MI1083-TF08-NS02

-x-0 I

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- -90 111 CI R.CUMFERENT I AL EXTENT

,2" ~XIAL EXTENT LOCATED AT UPPER OR LOWER EDGE OF SUPPORT, POSTULATED INDICATION CHARACTERIZATIDN

-XX-0 0

0 I' I,,

LESS THAN.1" AXIAL EXTENT

_..... 60° CIRCUMFERENTIAL EXTENT LOCATED IN AN X OR XS CONDITION SIMILAR TO 1982 LEAK INDICATIONS

-XS-0 0

0 LOCATED WITHIN TUBE SUPPORT PLATES "MMINIMUM AREA 360°X,2"

~NORMALLY ALSO EFFECTED

* ;;-

. OCCASIONALLY EFFECTED

NATURE OF INDICATIONS THE INDICATIONS WERE EVALUATED AND DETERMINED NOT TO BE REPRESENTATIVE OF THESE FLAWS:

WASTAGE PITTING DENTING PLATING MECHANICAL WEAR DEPTH OF INDICATIONS THE 4c4 PROBE IS NOT QUALIFIED FOR DETERMINATION OF CRACK DEPTH.

IF INDICATIONS OF CRACKING WERE OBSERVED IT WAS TO BE CONSIDERED PLUGGABLE.

CRACK DEPTH IS QUANTIFIABLE THROUGH THE ROTATING PANCAKE PROBE CRPC) TECHNIQUE.

SEVERAL CRACKS DETECTED BY 4c4 WERE SIZED WITH RPC AND DETERMINED TO BE 80 - 90% THROUGH WALL.

DEPTH CORRELATION dF THE x AND xs CONDITIONS IS CURRENTLY UNDERWAY AND AS YET DEPTH CANNOT BE QUANTIFIED.

HISTORY OF x, xs SEVERAL TUBES EXHIBITING x AND xs INDICATION WERE SELECTED AND THEIR RESPECTIVE BOBBIN HISTORIES WERE REVIEWED.

IN ALL CASES A SLIGHT (10%) INDICATION HAS BEEN PRESENT SINCE 1974 - 75 AND HAS NOT CHANGED THROUGH 1983.

ALSO, NINE (9) TUBES WERE SELECTED WITH 1982 4x4 RESULTS AND THE SIGNALS COMPARED.

RESULTS OF THE COMPARISON SHOW EVIDENCE OF THE SAME TUBE CONDITION IN 1982.

MI1083-TF08-NS02

TUBES S/G LEG INSPECTED/

A HL 780 A CL 704 B HL 575 B CL 682 1983 PALISADES STEAM GENERATOR EXPANDED INSPECIION INDICATIONS x

xx XS 12%

440 13

' 178 (10)*

10%

185 7

(6)*

279 9%

408 3

(3)*

1175 10%

175 3

(3)*

820

• NO OF TUBES WITH INDICATIONS.

Mll083-1F08-NS02 TUBES AFFECTED

• e 459 59%

421 60%

544 94%

591 87%

e

I

e.

100% INSPECTION STARTED ON OCTOBER 15.

ALL FOUR LEGS IN PARALLEL.

ALL TUBES TO BE INSPECTED WITH 4c4 TECHNIQUE SUPPLEMENTED AS NEEDED BY MULTIFREQUENCY AND ROTATING PANCAKE COIL.

INSPECTION RATE OF ABOUT 200 TUBES/DAY/LEG.

COMPLETION DATE SCHEDULE TO BE END OF NOVEMBER.

STATUS AS OF 10/24 SIG LEG TUBES TO BE INSPECTED TUBES INSPECTED*/ %

A HL 5703 1845 32%

A CL 5849 2583 44%

B HL 6012 1694 28%

B CL 6012 1365 22%

• DOES NOT INCLUDE TUBES INSPECTED IN ORIGINAL SAMPLE.

MI1083-TF08-NSO?.

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INTENDED INVESTIGATORY ACTIONS ET INSPECTION OF TUBES PULLED IN 1974 DEPLUG AND ET INSPECTION OF A SAMPLE OF TUBES PLUGGED IN 1974, 1975 AND 1976 DATA COMPARISON OF BOBBIN DATA FROM 1974 THROUGH 1983, AND 4c4 DATA OF 1981, 1982 AND 1983 INSPECTION OF IGA SAMPLES:

EXISTING LABORATORY IGA SAMPLES REAL S/G IGA TUBES LABORATORY SAMPLES FABRICATED BY CPCO TO SIMULATE THE PALISADES INDICATIONS INDEPENDENT DEPTH QUANTIFICATION STUDY MI1083-TF08-NS02

TUBE PULLING Objectives

1.

Validate x and xs ECT indications are defects.

2.

Attempt to corrolate ECT signals and defect depth.

3.

Attempt to determine the cause of the defects.

Candidates

- Secondary side

- Primary Side Schedule

- Tube Pull Complete

- Analysis Complete SG1083-0532A-NS04 "A" Steam Generator "Batwing" Area "B" Steam Generator 2nd TSP Mid-December Mid-January 1

2

(

LABORATORY ANALYSIS

- The analysis plan will be developed with assistance from EPRI SGOG.

- Candidate laboratories are the Vendor Labs and Battelle Columbus.

Two laboratories will probably perform independent analysis.

- The ana.lysis focus will be:

a.

Defect Morphology

b.

Extent of Defects (ECT Detectability)

c. Metallurgical Microstructure of the Tubing

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2 A-l~JT~

d.

Chemical Species Associated With the Defect SG1083-0532A-NS04

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LABORATORY RESULTS EVALUATION

1.

Eddy Current Testing

- Compare post pull ECT with actual defect depth data.

- Develop a signal to depth corrolation.

2.

Defect Cause

- Review the laboratory results for an assessment as to cause (and rate).

- Review Palisades secondary cycle operation.

- Perform stress analysis of selected steam generator locations.

- Review past ECT results (rate).

- Integrate and assign probable cause.

3.

Corrective Action

- Assess corrective actions based upon probable cause and rate of corrosion.

SG1083-0532A-NS04 3

LICENSING ACTIONS e

INSPECTION RESULTS e

ANALYSIS OF PULLED TUBES e

REPAIR CRITERIA e

REVISED OPERATING LIMITS AND SETPOINTS (IF REQUIRED)

STEAM GENERATOR TUBE PLUGGING CRITERIA CRITERIA ALLOWABLE DEGRADATION(%)*

OPERATING LIMIT

1.

TUBES MUST NOT BE 64 PRIMARY-TO-SECONDARY STRESSED BEYOND YIELD 8P ~ 1380 PSID**

STRENGTH DURING FULL RANGE OF NORMAL OPERATION

2.

THE FACTOR OF SAFETY 64 PRIMARY-TO-SECONDARY AGAINST FAILURE BY

/!JP~ 1380 PSID**

BURSTING MUST BE NO LESS THAN 3 DURING NORMAL OPERATION

3.

STRESSES INDUCED BY THE 64 PRIMARY PRESSURE COMBINATION OF LOAbS DUE

<. 2100 PSIA TO LOCA AND SSE SHALL NOT EXCEED LIMITS FOR FAULTED CONDITIONS (MEMBRANE + ~ENgING STRESS INTENSITY =

0, KSI)

4.

STRESSES INDUCED* BY LOADS 73 PRIMARY PRESSURE DUE TO A POSTULATED MAIN

< 2100 PSIA STEAMLINE BREAK SHALL NOT EXCEED LIMITS FOR FAULTED CONDITIONS

• ASSUMES UNIFORMLY THINNED TUBES

• • 1530 PSID DURING ANTICIPATED OPERATIONAL TRANSIENTS