ML17261A431

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Summary Exam Rept for 1987 Steam Generator Eddy Current Insp, Summarizing Observations & Corrective Action from Insp Performed During Feb 1987 Outage
ML17261A431
Person / Time
Site: Ginna Constellation icon.png
Issue date: 03/05/1987
From: Curtis A, Henry G, Saporito M
ROCHESTER GAS & ELECTRIC CORP.
To:
Shared Package
ML17261A430 List:
References
NUDOCS 8703160084
Download: ML17261A431 (39)
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Text

ROCHESTER GAS AND ELEC/FR[C CORPORATION 89 EAST AVENUE, ROCHESTER, NY 14649 RESEARCH AND SCIENCES DEPARTMENT MATERIALSENGINEERING AND INSPECTION SERVICES SECTION

SUMMARY

EXAMINATIONREPORT FOR THE 198? STEAM GENERATOR EDDY CURRENT INSPECTION AT R.E. GINNA NUCLEAR POWER STATION MARCH 5, 1987 PREPARED BY: A G.L. Henry, NDE echnician Eddy Current Level IIIExaminer DATE:

Z 5

87 REVIEWED BY:

Michael J. Saporito, Supervisor Materials Engineering Laboratories Level IIIExaminer DATE:

APPROVED BY:

A.E. Curtis III, Manager, Materials Engineering and Inspection Services

'Level IIIExaminer DATE:

8703i60084 870309 PDR ADOCN 05000244 PDR

~

~

1 1

TABLE OF CONTENTS

1.0 INTRODUCTION

PAGE 1 OF 30 2.0 DATA ACQUISITION PROGRAM PAGE 2 OF 30 3.0 DATA ANALYSISRESULTS'

SUMMARY

PAGE 5 OF 30 4.0 OBSERVATIONS PAGE 16 OF 30 5.0 CORRECTIVE ACTION PAGE 19 OF 30

U'.0 INTRODUCTION The following report is a summary of the results of the multifrequency eddy current examination performed during the February 1987 Annual Refueling and Maintenance Outage at the R.E. Ginna Nuclear Power Station.

The examination was performed on both the "A" and "B" recirculating steam generators which are westinghouse Series-44

design, containing 3260 Inconel Grade 600 tubes having an outside diameter of 0.875" and a nominal wall thickness of 0.050".

The examination was performed by Rochester Gas dc Electric (RGdcE) personnel that have been trained and qualified in the eddy current examination method to at least a Level I certification.

The initial data analysis review was performed by a team of ZETEC Inc. personnel.

An independent data analysis review was performed by RGAE and BRW personnel subsequent to the Zetec analysis.

The data analysis was performed, by both teams, utilizing the Zetec DDA-4 Digital Data Analysis System.

In addition, Zetec's Automated Data Screening System was utilized as a third review of the data.

Final resolutions of all data analysis was performed by RGRE Level IIIpersonnel.

The purpose of the eddy current examination was to assess any corrosion or mechanical damage that may have occurred during the operation cycle since March 1986.

Particular attention was given to detecting intergranular attack (IGA) and intergranular stress corrosion cracking (IGSCC) in the tubesheet crevice region; pitting and wastage between the tubesheet and first tube support plate; denting at all tube support plate intersections; and wear fretting at the antivibration bar to tube intersections in the U-bend region.

PAGF. 1 OF 30

2.0 DATA AC UISITION PROGRAM The eddy current examination of the "A" and "B" steam generators was performed utilizing the Zetec MIZ-18 Digital Data Acquisition System.

The frequencies selected were 400,

200, 100 and 25kHz, all of which were run in the differential and absolute modes.

The examination was performed primarily with a standard 0.740" or 0.720" O.D. bobbin coil, with smaller diameter probes used to traverse the smaller radius U-bends.

Prior to examination of the steam generators, an inspection program was established for the inlet sides of both the "A" and "B" steam generators.

The philosophy in generating this program is to provide 100% examination coverage of each steam generator tube from the tube sheet up to the first tube support plate, along with 3% of these tubes being selected and examined for their full length.

In addition, all previous tubes with indications greater than 20% through wall depth were examined as a

minimum to the location of their'egradation.

Table 1

is a

breakdown, by steam generator, of all tubes examined and to the extent inspected.

PAGE 2 OF 30

STEAM GENERATOR "A" 1987 EDDY CURRENT EXAMINATIONRESULTS PRIOR TO CORRECTIVE ACTION EXTENT INSPECTED FULL LENGTH NUMBER OF TUBES 124 PERCENTAGE 3.8%

PART LENGTH FROM INLET HTS

¹1 TSP H

¹2 TSP H

¹3 TSP H

¹4 TSP H

¹5 TSP H

¹6 TSP H

1 2907 77 5

0 0

3

< 1%

91.1%

2.3%

< 1%

< 1%

U-BEND

¹6 TSP C

¹5 TSP C

¹4 TSP C

¹3 TSP C

¹2 TSP C

¹1 TSP C

CTS

< 1%

SLEEVED TUBES 12

.3%

TUBES PERMANENTLY PLUGGED 126 3.8%

TABLE 1 PAGE 3 OF 30

STEAM GENERATOR "B" 1987 EDDY CURRENT EXAMINATIONRESULTS PRIOR TO CORRECTIVE ACTION

. EXTENT INSPECTED FULL LENGTH NUMBER OF TUBES 103 PERCENTAGE 3.2%

PART LENGTH FROM INLET HTS

¹1 TSP H

¹2 TSP H

¹3 TSP H

¹4 TSP H

¹5 TSP H

¹6 TSP H

0 2724 20 5

0 0

3 83.8%

< 1%

< 1%

< 1%

U-BEND

¹6 TSP C

¹5 TSP C

¹4 TSP C

¹3 TSP C

¹2 TSP C

¹1 TSP C

CTS

< 1%

< 1%

< 1%

< 1%

SLEEVED TUBES 201 6.2%

TUBES PERMANENTLY PLUGGED 201 6.2%

TABLE 1 (CON'T)

PAGE 4 OF 30

0 DATA ANALYSISRESULTS

SUMMARY

The initial and independent review data analysis was'erformed using the Zetec DDA-4 Digital Data Analysis System.

Edition 18.1 Rev. 4.2 of the data analysis software was used to analyze data from the MIZ-18 digital data acquisition system.

This system provides on-line data digitization and storage on to a magnetic data cartridge.

All digital data (up to 8 channels) is sent directly to the HP-9836 computer from the data cartridge.

A message block is available should any comments be desired during data acquisition.

All data cartridges were reviewed by displaying the 400 kHz data on the CRT along with the vertical component of the differential and absolute mix outputs in strip chart form.

Other frequencies and their components were selected as needed for final resolution.

All recordable indications were logged into the computer and stored on floppy disk.

The final report form summarizing all crevice and

>20% through wall dimension (TWD) indications for each steam generator (inlet and outlet) can be found in this section.

An explanation of the abbreviations and nomenclature used on these lists has been compiled for ease of interpretation.

Table 2 has been compiled to show a list of the total number of dents at each axial elevation and Table 3 is a breakdown of defects by percent TWD. The dent indications on this table are only those with signal amplitude of 5 volts and greater, which would approximate about a.0025" dent on the diameter of the tube.

PAGE 5 OF 30

'LIST OF )20% INDICATIONAND CREVICE INDICATIONNOMENCLATURE To of List Information SG-Steam Generator and Leg (ie: 1 = A, 2 = B and 1 = Inlet, 2 = Outlet)

ROW ROW number from the tube identification.

COL Column number from the tube identification.

VOLTS P-amplitude of the measured indication signal response.

%TWD - Percent through wall from O.D. based on measured signal.

CH¹ - Channel from which indication was determined.

LOCATION Location of indication relative to tubesheet or support plate.

Information Under %

<20 - Measurable indication less than 20% through wall.

SQR - Multiple indications interferring with a depth determination (IGA-SCC).

XX The measure percent through wall of the deepest penetration.

IGSCC - Integranular Stress Corrosion Cracking (SCC)

ADS - Absolute Drift Signal Indicative of IGA.

IGA - Intergranular Attack WAS - Wastage Information Under CH¹ 1 - Indication determined and measured with 400 kHz differential for final interpretation.

M2-Indication determined with absolute mix, depth cannot be accurately determined, but based upon amplitude is felt to be above 40% IGA.

PAGE 6 OF 30

LIST OF )20% INDICATIONAND CREVICE INDICATIONNOMENCLATURE(CON'T)

Information Under LOCATION/ELEVATION HTS SF Secondary face of inlet tubesheet.

TSP - Tube Support Plate CTS SF Secondary face of outlet tubesheet.

AVB-Antivibration Bars

-XX.X Depth below the secondary face of the tubesheet or support plates where the indication is located.

+XX.X-Height above the secondary face of the tubesheet or support plate where indication is located.

H-Hot Leg C - Cold Leg PAGE 7 OF 30

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5. 46 PAGE 8 OF 30

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18. wO"
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RGE-878 Steam Gener ator 8

QUERY'LL DEFECTS y ) 1 P / TN y y ALL VOLTS y ALI ELEV

( ALL TUBES ) y ALLSL ROW-CQL OUTAGE ELEVATION INDICATION TN VOLTS 1-35-36-8-

Z 38-28-Z8-36-ll 27 Cg

'77-

~88-

'97-8-

4 17-14-9-

58 58 58 59 61 63 63 64 64 64 65 65 67 69 72 75 75 75 77 77 78 78 79 7'7 80 82 84 84 85 86 86 86 89 RGE-878 RGE-878 RGE-878 RGE-878 RGE-878 RGE-878 RGE-878 RGE-878 RGE-878 RGE-878 RGE-878 RGE-878 RGF-878 RGE-878 RGE-878 RGE-878 RGE-878 RGE-878 RGE-878 RGE-878 RGE-878 RGE-878 RGE-878 RGE-878 RGE-878 RGE-878 RGE-878 RGE-878 RGE-878 RGE-878 RGE-878 RGE-878 RGE-878 RGE-878 RGE-878 RGE-878 HTS HTS HTS HTS HTS HTS HTS HTS HTB HTS HTS HTS HTB HTS MTS HTS HTB HTS HTS HTB HTS HTS HTS HTS HTS HTS HTS HTS HTS HTS HTS HTB HTS HTS HTS HTS BF SF SF SF BF SF SF SF BF SF SF SF SF SF SF SF SF SF SF SF BF SF SF SF SF SF SF SF SF SF SF SF SF SF SF SF 17.60" 17 c (}II 18.40H 16.30" 18

~ 70H 0.50"

1. 60" 1" 90" OOH
l. 70" 1

500

1. 70" f8.0" 17 50"
18. 30"
17. 40"
15. 90" 17.40" 16.80" 17.40" 17.70" 17 50" 16 ~ 10" 17.20" 17.60" 16 40" 18.fo"
17. 80" 17.40" 18 ao" 18.20" 19.00"
18. 80" f8 WOII 18 90" QD OD OD OD QD OD OD OD OD OD OD OD OD OD OD QD OD OD OD OD QD OD OD OD OD OD OD OD OD OD OD OD OD OD QD OD SCC SCC BCC SCC SCC WASTAGE WASTAGE SCC WASTAGE WASTAGE WASTAGE WASTAGE SCC SCC SCC SCC SCC SCC BCC BCC BCC SCC SCC SCC SCC BCC SCC SCC BCC SCC SCC SCC SCC SCC SCC SCC 75 85 97 90 96 22 Pf 70 Vf 59 73 94 66 89 87 92 86 83 83 99 84 97 81 83 47 47 75 73 1.40 i.'O,
0. 83
0. 60
i. 19
0. 87 3 ~ 20
0. 66
5. 38 3 ~ 36
4. 19 5 ~ 59 2 ~ 22
4. 84
1. 51 I t03
1. 16
2. 57
10. 96
1. 07
1. 0'7
3. 45
1. 09 57
1. 84 0 ~ 88
1. 19 1.80
i. 14
4. 49 j

t2

5. 23 V. 10
4. 83 3 ~ 37
6. 82 PAGE 12 OF 30

DENT TABLE FEBRUARY 1987 INSPECTION STEAM GENERATOR "A" ELEVATION DENT (VOLTS) 1.

2.

3.

4, 5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

15.

16.

17.

18.

19.

20.

21.

22.

23.

24.

25.

26.

27.

28.

29.

30.

31.

32.

33.

34.

35.

36.

37.

38.

39.

40.

41.

HTS PF HTS MID HTS SF HTS-Hl Hl Hl-H2 H2 H2-H3 H3 H3-H4 H4 H4-H5 HS H5-H6 H6

>H6 AVB1

>AVB1 AVB2

>AVB2

>AVB3 AVB3

>AVB4 AVB4

>C6 C6 C6-C5 CS C5-C4 C4 C4-C3 C3 "C3-C2 C2 C2-Cl Cl Cl-CTS CTS SF CTS MID CTS PF OTHER

<10 0

5 190 3

95 3

2 0

0 0

0 0

0 0

1 0

0 0

0 0

0 0

0 0

0 4

0 0

0 1

0 0

0 1

0 1

0 2

0 0

0 10-<20 0

2 88 3

85 0

8 0

0 0

0 0

1 0

3 0

0 0

0 0

0 0

0 0

0 4

0 0

0 1

0 1

0 2

0 1

0 0

0 0

0 20-<30 0

0 6

0 40

>=30 0

0 0

0 28 0

1 0

0 0

0 0

3 0

4 0

0 0

0 1

0 0

0 0

0 0

0 TOTAL 0

7 284 6

248 3

16 0

0 0

0 0

4 0

11 0

0 0

0 0

0 0

0 0

0 9

0 0

0 2

0 1

0 4

0 2.

0 2

0 0

0 TOTALS:

PERCENT:

308 51.4 199 33.2 55 9.2 37 6.2 599 TABLE 2 PAGE 13 OF 30

DENT TABLE FEBRUARY 1987 INSPECTION STEAM GENERATOR "B" ELEVATION DENT (VOLTS) 1 ~

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

15.

16.

.17 18.

1'9.

20.

21.

22.

23.

24.

25.

26.

27.

28.

29.

30.

31.

32.

33.

34.

35.

36.

37.

38.

39.

40.

41.

HTS PF HTS MID HTS SF HTS-H1 H1 H1-H2 H2 H2-H3 H3 H3-H4 H4 H4-HS H5 H5-H6 H6

>H6 AVB1

>AVB1 AVB2

>AVB2

>AVB3

AVB3,

>AVB4 AVB4

>C6 C6 C6-CS CS C5-C4 C4 C4-C3 C3 C3-C2 C2 C2-C1 C1 C1-CTS CTS SF CTS MID CTS PF OTHER

<10 0

0 204 4

4 0

0 0

0 0

0 0

00.

5 3

0 0

0 0

0 0

0 0

0 0

1 0

0 0

0 0

0 0

0 0

0 0

0 0

0 10-<20 0

2 111 0

7 0

0 0

0 0

0 0

0 0

0 0

0 0

0 0

0 0

0 0

0 0

0 0

0 0

0 1

0 0

0 0

0 0

0 0

0 20-<30 0

0 12 0

7 0

0 0

0 0

0 0

0 0

0 0

0 0

0 0

0 0

0 0

0 1

0 0

0 0

0 0

0 0

0 0

0 0

0 0

0

>=30 0

0 3

0 12 0

0 0

0 0

0 0

0 0

0 0

0 0

0 0

00.

,0 0

0 1

0 0

0 0

0 0

0 0

0 0

0 0

0 0

0 TOTAL 0

2 330 4

30 TOTALS:

PERCENT:

221 58.5 120 31.7 21 5.6 4.2 378 TABLE 2 (CON'T)

DEFECT TABLE FEBRUARY 1987 INSPECTION STEAM GENERATOR A Defects (Inlet) 0 - 19% TW 325 20- 39% TW 98 40- 49% TW 0

50 - 100% TW 15 SQR Defects (Outlet) 0-19% TW 4

20- 39% TW 8

40- 49% TW 0

50 - 100% TW 0

ADS 17 U Bend 0-19% TW 0

20- 39% TW 2

40-49% TW 0

50 100% TW 0

Defects (Inlet) 0-19% TW 160 20- 39% TW 27 40- 49% TW 4

50 - 100% TW 64 SQR 10 STEAM GENERATOR B Defects (Outlet) 0-19% TW 3

20- 39% TW 5

40- 49% TW 0

50 - 100% TW 0

ADS 72 PAGE 15 OF 30

4.0 i

OBSERVATIONS The results of the examination indicates that intergranular attack (IGA) and intergranular stress corrosion cracking (IGSCC) is still active within the tubesheet crevice regions on the inlet side of each steam generator.

The IGA/IGSCC is primarily located in the "B" steam generator with 153 total indications detected.

In the "A" steam generator 34 indications were detected.

Table 4 shows the steam generator IGA history.

GINNA'S STEAM GENERATORS CREVICE CORROSION INDICATIONHISTORY B-Steam Generator (A-Steam Generator)

Not Sizeable 0-25%

26-50%

51-75%

76-100%

A-S/G B-S/G TOTAL TOTAL March 1979 0

December 1979 0

April 1980 19 November 1980 2

April 1981 0

February 1982 1

October 1982 27 April 1983 11(3)

March 198'4 5

March 1985 23 February 1986 3(2)

February 1987 82(17) 3(1) 9(2) 15 0(1) s(1) 7(1) 9(1) 14(1) 16(3) 16 15 27(1) 25 46(13)

(0)

(0)

(0)

(0)

(0)

(0)

(4)

(2)

(5)

(34) 31 14 13 59 51 69 52 153 TOTALS 173(22) 27(3) 4s(2) 80(6) 138(14)

(47) 466 TABLE 4 PAGE 16 OF 30

<J

The cause of the inlet tubesheet crevice corrosion indications is intergranular attack and intergranular stress corrosion cracking of the mil-annealed Inconel 600 tube material.

This form of corrosion is the result of the tubesheet crevices forming an alkaline environment.

This crevice environment has developed over the years as deposits and active species like sodium and phosphate, have reacted, changing a neutral or inhibited crevice into the aggressive environment that presently exist.

A large volume, typically <20%

TWD (Through Wall Dimension) wastage type condition exists just above the tubesheet secondary face.

A small percentage of the tubes, generally toward the center of the bundle, have this condition. Several of these tubes did have penetrations

>20% TWD.

These tubes were affected by the original water chemistry conditions when phosphate was used as a buffering medium and have not seen further degradation since 1975.

Small indications of probable copper deposits were also found in the tubesheet crevice region randomly located throughout each steam generator.

Based on studies performed with copper plated on Inconel tubing and the phase relationships of these signal responses at the different inspection frequencies the indications can be attributed to copper deposits and not a defect condition.

Minor denting has been detected at the tubesheet secondary side face for many years in both steam generators, primarily on the inlet side.

Denting was also detected at the

1st, 2nd and 6th tube support plates randomly throughout the generator, and in most cases was of greater magnitude in size.

No tubes were found which obstructed the passage of a 0.720" O.D: probe.

In general, minor distortions of most of the tube support plate signals were seen.

PAGE 17 OF 30

4.0 OBSERVATIONS (CON'T)

The denting phenomenon and minor distortions at the tubesheet and support plates can be attributed to secondary side corrosion product build-up in the annular region between the tube outside surface and the carbon steel support member.

Comparisons with previous data does not indicate any change in the extent or magnitude of denting from what has been detected by previous inspections.

Several indications were detected in the cold legs of the "A"* "B"steam generators in and around tube R23-C46.

A review of previous years data revealed these indications to be present.

They appear as a shallow ID indication <20% which were confirmed visually to be an expansion of diameter within the tubesheet.

This was caused by a cam-lock expansion device which was used in earlier years to suspend lead blankets from the tubesheet primary face.

In summary, the "A" Steam Generator had thirty four (34) tubes that were found to have tubesheet crevice indications.

The "B" Steam Generator had one hundred fiftythree (153) tubesheet crevice indications.

One tube in the "A" Steam Generator had two (2) indications at the third and fourth anti-vibration bar intersections.

These indications are greater than 20% but less than the repair limit, and have not changed since the 1986 Inspection.

This tube will be re-examined at the next inspection to determine if there is an active fretting wear damage mechanism going on.

In light of the fact that only this tube exhibits these indications, AVB fretting wear is not a major concern.

PAGE 18 OF 30

5.0 CORRECTIVE ACTION Table 5 has been generated to identify the tubes with crevice indications or with indications which exceed the repair criteria.

This table also shows the location and axial extent of the indication and what corrective action was taken on these tubes.

All tubes requiring repair had hot leg tubesheet crevice indications which were identified by an absolute drift signal of the Mix-2 Channel and/or quantifiable intergranular stress corrosion cracking (IGSCC) indications by the 400 kHz data.

Several squirrel type (SQR) indications, multiple IGSCC, were also identified and have been placed on the list of tubes requiring corrective action.

A total of 24 sleeves and 10 plugs were installed into the "A" steam generator.

The "B" steam generator required a total of 80 sleeves and 73 plugs to be installed.

One plug is attributed to a sleeve installed this outage which had to be removed from service due to unacceptable ultrasonic examination results of the upper weld.

As part of the Inspection Program for the "B" steam generator, a

750 PSI Hydrostatic Pressure Test was performed from the secondary side to locate any tubes, sleeves or plugs which were leaking.

The results of the visual examination of the "B'ot leg tubesheet during the hydro indicated that 2 tubes, 2 1980 Test

Sleeves, 11 Westinghouse Explosive
Plugs, and one CE.Mechanical plug in the cold leg were identified as leaking.

The 2 tubes identified were confirmed by eddy current testing to have high percent through wall indications

()80% TWD) in the midspan of the hot leg tubesheet which are probable intergranular stress corrosion cracks (IGSCC).

Five of the explosive plugs were drilled out and replaced with a welded "Top Hat" plug.

The remaining six explosive plugs were left in service as their leakage rate was extremely small.

The CE Mechanical Plug in the cold leg was removed and replaced with another CE Mechanical Plug.

PAGE 19 OF 30

CORRECTIVE ACTION (CON'T)

~

'he 2 sleeves identified as leaking were B*W 36" Brazed Sleeves which were installed in 1980 as part of a test program.

An eddy current inspection using annular differential magnetic bias probe was performed on these sleeves and the 3 other test sleeves installed in 1980, in addition to the 20% random inspection of all sleeves installed.

The results of data analysis for the sleeves of the braze/expansion regions as well as the lower roll transitions revealed no detectable degradation or deviation from the eddy current signature seen in the other sleeves or from the 1986 Inspection Data.

An ultrasonic inspection of the braze regions, performed in 1983, showed that the brazed bonding of the sleeve to the parent tube marginally met the acceptance criteria.

At that time it was resolved that these sleeves would be considered leak limiting, not hermetically sealed, and be left in service until leakage was detected.

The analysis for the parent tube showed that Tube 21-47 has a

deep IGSCC indication (estimated at 94% TWD) and Tube 24-47 has three deep IGSCC indications (deepest estimated at 97% TWD) located in the midspan of the tubesheet region.

A review of the 1986 Data for these parent tubes also revealed the existence of these deep flaws.

An increase in the volume (based on the amplitude of the signals) was noted when comparing the 1987 to the 1986 data.

Based on the detection of a through wall defect in the parent tube and the braze condition of the sleeve, existence of the primary to secondary boundary leak has been confirmed.

These 2 sleeves have been removed from service using a B*W explosive plug.

PAGE 20 OF 30

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04) lo p)) sooooo EIARccc)r. I 00x 00 oaoaso Pa8e "Steam Benevatav-A REPORT-TUBES REQUIRINB CORRECTIVE ACTION ROW COL VOLTS DEG IND CHN LOCATION COMMENTS EXTENT TAPE PRB il 11 11 1 i.il 11 11liiliiii 11 11il 11 11 11 11li 11ii 11llll 11 11lill 11 11 11 11 11illl 11 24, 21 20 21 21 278li 18 39 15 21 15 1*26 31 17 17 19 30

<<> ~r 8

88 215 10 10 13 15 19 20 20 26 28 34 35 36 36 37 38 46 50 51 51 53 54 54 54 54 55 61 65 66 67 68 69 71 1. 73

0. 72 1

~ 08 2 ~ Si

1. 00
1. 73 3 ~ 22 1. 56
0. 8 1
8. 85 1

~ 70

.55

1. 25
0. 43 3 ~ 8'9
0. 79
a. Oi 3.21 6.39
7. Si 2 ~ 25
3. 54
2. 86 3 ~ 55 0 ~ 55 5.40
0. 71
1. 74 1

~ 94

1. 69

.89 2 ~ 98 4 ~ 93

4. 05 2 ~ 27 66 60 1$6 51 58 41 57 81 53 47 35 43 129 61 35 266 87 30 40 51 76 47 607 49 27 45 PP 9 31 70 79 80 84 ADS 74 86 ADS ADS 92 80 77 ADS ADS 90 ADS 90 ADS ADS SQR ADS 94 85 ADS 90 7<<>

ADS 84 SQR 76 ADS ADB ADS 72 ADS ADS ADS 27 M

M M

M M

M M

M M

I'I M

M M

I'I M

M M

M M

M M

M M

M M

M M

M M

M M

M M

1 1

122 1

1 2

1 1222 1

122 2

122 HTB HTS HTS HTS HTS HTS HTS HTS HTB HTS HTS MTS HTS HTS HTS HTS HTB HTS HTS HTS HTS HTS HTS HTS HTB HTS HTS HTS I-ITS HTS HTB HTS HTS HTS HTS HTS 18.

1

17. 3
18. 2
15. 0
18. 1
15. 1
14. 3 17 ~ 8
17. 9 17.?

17

~ 1

16. 7
13. 7 iS. 2
13. 2 18

~ 0 11.

1

17. 9 18 ~ 2 3 ~ 1 11

~ 0 1$. 1

17. 0
18. 6
16. 4 9.7

] 4 ~ 2r

14. 3 13 ~ 0 lb. 4
17. 0 18 ~ 4
15. 5 18.

1 16 ~ 8 17 ~ 1 PLG PLG PLG PLG SLV SLV SLV SLV SLV SLV SLV SLV PLG SLV PLG PLG PLG SLV SLV SLV PLG SLV SLV SLV SLV SLV SLV SLV PLG SLV SLV SLV SLV SLV SCC BCC IBA SCC SCC ISA IBA SCC SCC SCC IGA IBA BCC IGA SCC IGA IGA SCC IGA BCC SCC IGA SCC SCC IGA SCC SCC IGA IGA IGA IGA SCC IGA IGA IBA IGA

¹1

¹1

¹1

¹1

¹1

¹1

¹1

¹1¹1¹1

¹1

¹1

¹1¹1

¹1¹1

¹1¹1¹1¹1¹1

¹1¹1

¹1

¹1¹1

¹1¹1

¹1¹1

¹1

¹1 TSP TBP TSP TBP TSP TSP TSP TSP TSP TSP TSP TSP TSP TSP TSP TBP TSP TSP TSP TSP TSP TBP TSP TSP TSP TSP TSP TSP TSP TBP TBP TBP TSfi F/L

¹1 TSP

¹1 TSP M

H H

H H

H H

H H

H H

H H

H H

H H

H H

H H,

H H

H H

H H

H H

H H

H H

H 8888888 1

1 1

22 447744444 48555 66 740 74C) 740 740 740 740 740 740 740 740 700 740 740 740 740 740 740 740 740 740 740 740 740 740 740 740 740 740 740 740 740 740 700 740 740 TABLE 5 PAGE 21 OF 30

STEAM GENERATOR "A" TUBES RECEIVING CORRECTIVE ACTION FEBRUARY f987 PLANT'INNA GENERATOR A

TOTAL TUBES:

3260 S ~ CE ET'LEEYES (24)

P ~ CE PLUSS (io)

TOTAL TlSES ASSISNHL 34 r p h

-es l

oK

- Ro

- jo I

I I

I I

R INLET (Hot Leg)

Pt iaery Fece I

I I

I I

I I

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B REPORT-TUBES REQUIRING CORRECTIVE ACTION SG VOLTS DEG IND CHN LOCATION COC'IMENTS E XTENT PRB 21 21 21 21 21 21 21 21 21 21 21 n j 2a 2a 21 21 2j.

21 21 21 212f 21 21 21 21 21 21 21 21

~a 21 21 21 21 21 2f 21 21 n j 21 21 21 21 21 21 21 n j 11 18al5 1 r) 8 15 2

11 24 9J 18 18 18 148 28 ns 38 28 21 36 21 31 12 21 40,9 9

26 323 36 34 6

3a 11 1

16 1'9 11 6i9ll ns 36 7

78 13 13 13 14 14 14 15 15 16 1.6 16 1*

16 18 18 18 20 24 24 25 25 25 34 34 p7 37 38 u'9 4n 42 42 44 44 44 45 45 45 46 4*

47 48 4s 48 49 50 51 52 54 54 54

0. 99 1.49
1. 85
1. 58
1. 72 2 ~ 47 1 32 1

~ 49

1. 84 1.80 1. 99 4, 27
4. 48
1. 61
2. 50 57 1..1 4 ~ 62
1. 83
3. 11
2. 86 2 33

'4t 5o

4. 73
3. 48
1. 95
0. 61 0 ~ 7
1. 46 1.0

~

0. 37
0. 69
1. 46 0 ~ 58
0. 75 2 ~ 55
1. 29 r). 51
2. 3r) 5, 2(.)

1.34 ot 33 1

~ 63

0. 38
0. 45
0. 51
2. Ou 2-5?
0. 90

.'. ~ 3(.)

4. 56

.58

(.l 40

0. 90
1. 74
1. 04
2. 74
8. 27 r)...9
1. 40 O. 61
2. 56
5. 77 19 16 74 45 178 128 134 146 62 138 61 204 101 110 115 17 69 174 143
  • 7 113 n9 19 28 65 66 77 87 43 85 86 51 58

+3 lub 156 5 Q 20 50 166 37 57 85 87 48 40 86 84 z9 308 ul 46 50 17 65 80 10

.60 45 30 46 55 47 83 97 ADS ADS ADS ADB ADS ADS 67 47 ADS ADB ADS ADS BQR ADS ADS ADB SQR ADS ADS SQR ADS ADS 75 81 65 76 90 57 67 85 88 so SQR ADS ADS ADS6 79 81 97 77 50 96 84 77 78 ADS ADS 94 7?

88 85 86 85

~ 5 71 SQR SQR ADS 94 ADB ADS N

1 ra a

1 1

t'I 2 t'I 2 t'I CC 2 N 2 rc 2 N 2 t"I 2 t'I 2 M 2 N 2 M 2 M 2 M 22 N

N 2 M 2 N 2 t'1 2 N 2 t'I 2 N

1 M

1 1

t"I 1

N 1

N 1

t'I 1

1 M

1 t"I 2 1

1 N

N 2 N

1 N 2 f1 1

N 1

1 t'I 1

1 N 2 1

1 N

M 2 N 2 C'I 1

M 1

M 2 M

N 2 M

t1 1

N 2 t'I 1

t'I 2 M

1 C I 2 C'I 2 HTS HTS HTB HTS HTS HTS HTS HTS KTB HTS HTS HTS HTS HTS HTB HTB HTS HTS HTS HTS HTS HTS HTS HTS HTS HTS HTS HTS HTS HTS HTS HTB HTB HTS HTB HTS HTS HTS HTS HTS HTB HTS HTS HTS HTS HTS HTB HTS HTS HTB HTS HTB HTB HTB HTS HTB HTB HTS HTB HTB HTS HTS HTS HTS HTS HTS HTS HTS HTS HTB

18. >

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18 ~ 3

18. 2
17. 3 lb. 8
17. 7 j.*.9
17. 2
16. 9 17 ~ 7
17. j.

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17. 6
17. 6
17. 5
17. 5
17. 8
13. 4
17. 7 1.8 ~ 5 17

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17. 7 j.b. (.)
16. 3 lb. 9
16. 5
18. 6
18. 2 17.7
17. 9 15

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18. 5 7.6 5.7
18. 5
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16. 6
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17. 2
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16. 7 PLG PLS PLG PLS PLG SLV SLV SLV SLV BLV PLS SLV PLS PLG SLV PLS PLG PLG SLV SLV PLG SLV BLV PLG BLV SLV SLV PLG PLG PLG PLG PLG PLG SLV SLV PLG SLV SLV SLV SLV SLV PLG BLV BLV PLG PLG SLV SLV SLV SLV PLG PLG PLS SLV F'LG PLS SLV SLV SLV PLG SLV SLV SLV SLV SLV SLV SLV BLV SLV PLG SCC BCC SCC SCC SCC IGA IGA IGA ISA ISA IGA SCC SCC IGA IGA IGA IGA BCC IGA IGA IGA SCC IGA ISA BCC IGA ISA BCC SCC BCC SCC BCC SCC SCC BCC SCC SCC SCC SCC SCC IGA IGA IGA SCC SCC SCC SCC SCC SCC SCC SCC SCC SCC IGA IGA BCC SCC SCC SCC SCC BCC SCC SCC BCC SCC SCC IGA SCC IGA ISA Nl TSP Na Tsp Ni TBP Ni TSP Na TSP N j. TSP Nl TSP Nl TSP N 1 TSF'i TSF'iTSP Nl TSP Ni TSP Nl TSP Ni TBP Ni ISP Na Tsp Nl TSP F/L Nf TSP F/L Nj TSP Na TSP Nl TSP Nl TSP Nl TBP Nl TSP Ni TSP Na TBP Ni TSP Nf TBP Nl TSP It:a Tsp F/L Ni TBP F/L Nl TSP Nl TSP Na TBP Ni TBP Ni TSP Nf TSP Ni TSP Na TBp Nl TSP Ni TSF N1 TSP Nl TSP N

a'BF'l TSP Nl TSP Nl TBP Nl TBP Nl TBP Nl TSP Na TBP Ni TSP N1 TSP Nl TBP Nl TBP N 1 TBI='iTSP N 1 TBF'iTBP Nl TSP Nl TSP Nl TBP Ni TSP 1

TBP TSP H

H H

H H

H H

H H

H H

H H

H H

H H

H H

H H

H H

H H

H H

H H

H H

H H

H H

H H

H H

H H

H H

H H

H H

H H

H H

K H

H H

H H

H H

H H

H H

H H

H 10 1 r) 1 1

1 22 2

2 22 2

P 3

4 44 jr) 4 555555 555 fJ5b5 105 105 1066

?r)0 7VO 740 74r) 740 740 740 740 740 740 740 740 74V 740 740 740 74r) 740 700 740 740 74r) 7 4(.)

740 740 740 740 740 740 740 740 74(.)

740 70(.)

74(b 700 74V 740 74(:)

74(.)

740 740 740 740 700 740 700 740 740 740 740 740 740 700 700 700 740 740 740 740 740 740 740 700 740 700 740 700 74(.)

740 TABLE 5 (CON'T)

PAGE 23 OF 3I)

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GINNA Qs (QQT oatM AH tttttt QAQeaev I eax eo. tAtttt PBBe Gener ato(:

REPORT<<

TUE(ES REQUIRING CORRECTIVE ACTION ROM COL VOLTS DEG IND CHN LOCATION COMNENTS EXTENT TAPE PRE(

21 21 21 2}

21 21 21 21 2f2f 21 21 21 2f 21

?12}

2}

21 2f 2f 21 2}

21 21 212!

21 21 2}

2}

21 21 21 21 21 21 21 2}

2f 1

22 2}

21 21 2}

2f 212f 21 22 n}

21 21 21 22 7

35

.:"6 27 42 34 8

~I~

48 31 32 24 38

}4 28 3*

17 36 4

52 58 11 m'3 4

13 35 11 24 18 24 14 279 24 262 27

&2 27 288 ng C J 55 55 55 55 55 55 56 57 57 58 58 58 58 58 5'9 59 60 bv 61 61 61 61*2 63 64 64 65 65 65 65 65 65 66 66 66 67 67 67 67 67 67 68 68 68 68 69 69 69 69 70 70 70 71 71 71 72 72 72 75 75 75 75 76 77 77 78 78 79

1. 64
3. 46
l. 91 3 ~ 9}

2 ~ 39

j. 25 1.

99'.13

1. 95
1. 40
2. 9(.)
3. 97
l. 00
0. 83
0. 60
2. 15
3. 79
1. 19
4. 07
1. 26
2. 44

>. 19

3. 71
3. 01

.66

4. 19
1. 04
2. 22
4. 21
3. 36
1. 89 4 ~ 84
l. 51 2 ~ 71
4. 11
3. 34 4 ~ 34 4 ~ 25
3. 84 5 ~ 41
4. 76 f,. 03
3. 52
2. 68
3. 72 2 ~ 30
1. 74
1. }6
2. 04
6. 07
4. 39 2 ~ 89 1

~ 69

4. 87
i. 76
2. 85
3. 98
2. 67 2 ~ 57 10 ~ 96
1. 28
1. (j7
0. 83
3. 45
l. 09
2. 57
1. 84 57 31 38 40 126 80 20 35 44 47 51 22 56 44 37 47 25 18 11 41 39 56 42 29 23 58 46 42 17 39 28 26 53 28 l}2 3}

32 31 53 5(j 27 28 56 34 54 37 27 3i 48 75 63 35 112 49 70 38 74 227 ADS ADS ADS ADS SQR 96 ADS ADS 50 ADS ADS 75 85 97 ADS SQR 90 ADS ADS ADB SQR ADS ADS

'96 ADS SQR 91 ADB ADB ADS ADS 70 91 ADS ADS ADS ADS ADS ADS ADS ADS 59 ADS ADS ADS ADS ADS 73 ADS ADS ADS ADS ADS ADS ADS ADS ADS ADS 94 66 ADS 89 87 ADS 86 83 83 ADS N

M M

M N

N M

N M

M M

M N

N M

M M

M M

I"I I"I I"I M

M M

M N

N N

M N

N N

M M

M N

M M

M N

M M

M M

M M

M M

N N

M M

M N

M M

I"I N

2 12 1

122 1

1 2

1222 22 12 1

1 2

1222 22 2

22 1

2 2222 22 1

2 1

1 1

1 HTS HTS HTB HTS HTS HTS HTS HTS HTS HTS HTS HTB HTS HTS HTS Hrs HTS Hls HTS HTS Mrs HTB HTS HTS HTS HTS HTS HTS HTS HTB HTS HTS HTS HTS HTS HTS HTS HTS HTS HTB HTS HTS HTS HTS HTS HTS HTS HTS HTS HTB HTB HTS Hrs HTS HTS HTS HTS HTS HTS HTS HTS HTS HTS HTS HTS HTS HTS Hrs HTS HTS 14

~ 6

13. 4
16. 2
15. 3
16. 5
16. '9
17. 1 6 ~ 0 18.

1

17.
  • 17 ~ 7 17 ~ 6
17. 5
18. 4
16. 3
17. 3
17. 5 18 ~ 7 17

~ 0 16.

1

17. 2
17. 2
15. 2 fB. 1 17 ~ 9 f6. 1
15. 8
18. 3 lb. 3 lb. 4 14 ~ 9

}3 ~ 0 17 ~ 5

18. 3
13. 7
12. 3
14. 3 16 ~

1

15. 9
15. 9 lb. 7

}5. 0

17. 4 15

~ 6 lb. v lb. 1 lb. 1

16. 7 15

~ 9

16. 7 lb. 3 16 ~ 5 16.

1

17. 6
15. 7 lb. 3
17. 4
16. 6
15. 6
17. 4
16. 2
16. S 16 ~ 8
17. 4 lb. 1
17. 7
17. 5 lb. 1
17. 2 17

~ 0 SLV PLG SLV SLV PLG PLG PLG SLV PLG PLG PLG PLG PLG PLG SLV SLV SLV PLG SLV SLV SI V PLG SLV BLV PLG SLV SLV PLG SLV SLV SLV PLG PLG PLG SLV SLV BLV PLG SLV SLV SLV SLV PLG SLV BLV SLV PLG SLV SLV SLV PLG PLG SLV SLV SLV SLV PLG SLV PLG PLG PLG BLV PLG PLG BLV PLG PLG SLV PLG PLG IGA IGA IGA IGA SCC BCC IGA IGA SCC SCC IGA IGA SCC SCC SCC IGA SCC SCC IGA IGA IGA SCC IGA IGA BCC IGA SCC SCC IGA IGA IGA IGA SCC SCC IGA IGA IGA IGA IGA IGA IGA IGA SCC IGA IGA IGA IGA IGA BCC IGA IGA IGA IGA IGA IGA IGA IGA IGA IGA SCC SCC IGA SCC SCC IGA SCC SCC SCC SCC IGA

¹1

¹1 Qi

¹1

¹1

¹1 Qf.

Ql Qi

¹1 Ql

¹1

¹1¹1 Qi

¹1

¹1

¹1

¹1¹1

¹1¹1

¹1 Qi Qi

¹1¹1¹1

¹6 Ql

¹1

¹1 Ql

¹2¹2¹f.

Qi

¹1¹1

¹1¹2

¹1¹1

¹1 Ql Qf

¹1

¹1 Qi

¹1 Qi

¹1 Qi

¹1¹2 Qi

¹1¹1

¹1¹1

¹1

¹1 Ql

¹1¹1¹1

¹1 TSP TSP TSP TSP TSP TSP H

H H

H H

H lSP TSP TSP TSP TSP TSP TSP TSP TSP TSP TBP lBP TSP TSP TSP TSP TSP TSP TSP TBP TSP TSP TSP TSP TSP TSP TSP TSP TSP TSP TSP TSP TSP TBP TSP TSP TBP TSP TSP rsp TSP TSP TSP TSP TSP TBP TSP TSP TSP TSP TSP TBP TSP TSP TSP TSP TSP TSP H

H H

H H

H H

H H

K H

H H

H H

H M

H H

H H

H H

H H

C H

H H

H H

H M

H H

H H

H H

H H

H H

H H

H H

H H

H H

TSP M

TSP" H rsp H

TSP H

TSP H

TSP 666666666 1066 66 fO66*666666 10 6

106 77 7

7 76 7

7 77777777 77 777 7

7 7

77 77 7

777 7

7 777 7

7 7

7 8

740 740 740 74(3 740 740 740 740 740 700 740 74(j 740 740 700 740 740 740 740 740 74v 740 740 740 700 740 70(3 740 74(.)

740 740 740 740 740 740 740 74'>

74(3 74C>

740 740 740 740 740 740 740 740 740 740 740 740 740 740 740 740 740 740 740 740 740 740 740 740 740 740 740 740 740 740 740 TABLE 5 (CON'T)

PAGE 24 nF 3tI

~oi Roc c TUB4N

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Plant;-GINNA 2y

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Page Steam Guet atat B

REPORT-TUBES REQUIRING CORRECTIVE ACTION COL VOLTS DEG IND CHN LOCATION COMMENTS EXTENT PRB 21 21 21 21 21'1 21 4,

p3

~7 8

17

'1 lli 1"

2 79 7'P 80 80 82 84 84 85 86 86 Bb 87 87 0 ~ 88

l. 19
1. 80
1. BC)
1. 14
4. 49
1. 32
59. 10 4.8" 3 ~ 37
1. 53 82 41 54 43 80 38 19 1'P 54 40 24 74 40 99 84 ADB 97 Bi 8"

47 47 75 cjl2 73 ADS 1

M 1

M 1

1 M 2 1

M 2 M 2 M 2 M 2 M 2 HTS HTS HTS HTB HTB HTB HTS HTB HTS HTS HTB HTS HTS 17

~ 6

16. 4 18.

1

17. 8
17. 4
18. 3 18.

~

19. 0
18. 8 18.

~

18. 3
18. 9 SLV SCC BLV SCC PLG IGA PLG BCC PLG BCC PLG SCC PLG SCC PLG SCC PLG SCC PLG BCC PLG BCC PLG IGA PLG SCC Qi TSP H

01 TSP H

Q 1 TSP H

41 TSP H

Cl TSP H

Ol TSP H

41 TBP H

01 TBP H

Ni TBP H

Ql TSP H

Cl TBP H

41 TSP H

Ql TSP H

88888888 740 740 740 740 740 740 740 740 700 700 700 700 700 PAGE 25 OF 30

STEAM GENERATOR "B" TUBES RECEIVING CORRECTIVE ACTION FEBRUARY f987 PLANT:

GINNA GENERATOR B

TOTAL TUBES'260 P ~ PLU66EO 7lSES f987 P5)

S ~ CE 27'LEEVE (80)

TOTAL TUBES ASSISHED:

155 P

P P

P C4 o8 P

3 P

P P

h

-25 20 IV

- ca

~ P PP P

- 10 33$

3 P

I I

I I

I 8

I ZHLET SOL'dg)

PPfddPQ FdCd COLWHS HAtlfAV I

I I

I I

I I

I I

I I

I R

Q

'Q R

Q I

)3 R

R 8

S 8

Q

TABLE 6 STEAM GENERATOR TUBE INSPECTION AND CORRECTIVE ACTION HISTORY DATE NO.

TUBES INSPECTED PRIMARY TO SECONDARY

~LEAKAEE.

TOTAL TUBES REQUIRING CORRECTIVE ACTION NO.

DEFECTS TYPE OF DEGRADATION REQU )RING REPAIR

>40%

NO.TUBES PLUGGED NO. TUBES SLEEVED NO.TUBES PULLEE COMMENT A

8 Hot Cold Hot Cold A

8 A

8 A

8 A

8 A

8 IN FACTORY APRIL 1972 MARCH 1974 NOV.

1974 MARCH 1975 JAN.

1976 FEB.

1976 APRIL 1976 Q APRIL 1977 JULY 1977 JAN.

1978 APRIL 1978 FEB.

1979 100 1025 75 2003 268 1525 268 300 2049 2049 325 325 1714 375 1714 375 1050 3259 516 1098 516 1701 430 672 39 2174 442 1931 442 53 3192 3192 3247 3247 0.005 A 8/G 0.091 8 S/0 0.099 8 S/0 0.012 8 8/0 0.060 B 8/0 39 13 2

2 15 I

15 0

0 19 0

2 0

46 ll WASTAGE WASTAGE CRACKINO/WASTAGE WASTAGE WASTAGE CRACKINO WASTAGE IO CRACKINO CRACKINO/WASTAGE IO CRACKING CRACKINO/WASTAGE 2-IOA 19 13 0

0 0

11 2

2 IS I

5 8

15 6

I 0

0 19 0

2 0

46 11 0

2 39 2

0 15 13 I

DEC.

1979 APRIL 1980 3139 325 3182 375 0.007 8 S/0 13 31 I I-IOA, 2-WASTAGE "A" PITTINO/

13 13 13 I

31 NOV.

1980 MAY 1981 FEB.

1982 SEP.

1982 APRIL 1983 MARCH 1984 MARCH 1985 FEB.

1986 FEB.

1987 3138 325 3138 325 3137 526 3138 382 3137 633 3137 717 3135 3135 3134 623 3128 TOTALS 3151 375 3141 400 3140 526 3129 893 3096 832 3093 963 3087 3087 3083 770 2884 700 8 8/0 15 34 171 I

32 78 10 Sff 153 537 "8" IOA IOA IOA. WASTAGE IGA. MECH.

OAM IOA IOA.

SCC IGA.

SCC IOA. SCC.

WASTAGE IOA. SCC, WASTAGE IOA.

SCC

'17 145 28 23 I

33 34 4

74 I

9 70 49 2

4 2

87 27 6

30 78 368 10 136 73 24 80 274 36 281 2

0 5

6 7

16 16 19 I3)

(4)

(5)

(6)

(7) 18) 5.2 16 4

4 ~ 4 11 3

4 ~ I 8 ~ 4 1 I 8 ~ 6

~ 3

STEAM GENERATOR TUBE INSPECTION AND CORRECTIVE ACTION HISTORY COMMENTS FROM TABLE 6 (1)

Pulled R15 C55 and R17 C41 from the hot leg and R17 C40 from the cold leg to determine IGA conditions in the "B" steam generator.

R17 C41 and ECT indications at all frequencies, R15 C44 had just 100 kHz Absolute ECT indication and R17 C40 had no ECT indication.

Both hot leg tubes had approximately 5096 IGA, R17 C41 had a 60% SCC indication associated with the IGA.

(2)

Manually sleeved five (5) tubes with nickel plated - Inconel 600 thermally treated sleeves.

Three tubes had IGA indications, two others were preventatively sleeved.

(3)

Sleeved 16 tubes with co-extruded sleeves, 13 with defects with 3 preventatively.

Pulled R21 C46 with a 100 kHz ECT indications, R7 C45 and R28 C45 which were clean. Alltubes pulled were from the hot leg.

(4)

Recovery from the January 25, 1982 Tube Rupture Event included removing 26 tube sections by EDM and ID Cutters along with the one tube pulled from the secondary side.

(5)

The four tubes identified with IGA in the "A" steam generator were sleeved with 22" tubesheet sleeves.

The 78 tubes identified in the "B" steam generator with IGA and/or SCC in the crevice were repaired as follows:

41 tubes were sleeved with 36" brazed sleeves 9 tubes were sleeved with 28" brazed sleeves 24 tubes were sleeved with 22" tubesheet sleeves 1 tube and 2 sleeves were plugged 1 tube R34 C54 was pulled for metallurgical analysis TABLE 6 (CONST)

PAGE 28 OF 30

STEAM GENERATOR TUBE INSPECTION AND CORRECTIVE ACTION HISTORY COMMENTS FROM TABLE 6 (6)

The two tubes identified with IGA in the crevice in the "A" steam generator inlet were sleeved with 20" tubesheet sleeves.

One indication

>40% TWD in

'the U-bend was permanently plugged.

The 70 tubes identified in the "B" steam generator were repaired as follows:

56 tubes were sleeved with 20" tubesheet sleeves 10 tubes were sleeved with 36" brazed sleeves 3 tubes were mechanically plugged (CE removable) 1 tube was explosively plugged 1 tube was sleeved with a 36" brazed sleeve due to the domino effect.

(7)

The five tubes identified with crevice indications in the "A" steam generator inlet were sleeved with 27" Combustion Engineering Sleeves (CE).

One tube identified with general O.D. indication above the secondary side tubesheet was also sleeved with a CE 27" sleeve.

The 57 tubes identified in the "B" steam I

generator were repaired as follows:

27 tubes were sleeved with CE 27" Sleeves 27 tubes were mechanically plugged (CE removable) 3 CE Mechanical Plugs installed in 1985 were removed and sleeved with 27" sleeves The present sleeve installation status is 83 brazed sleeves, 88 tube sheet sleeves, 30 welded CE sleeves in the "B" steam generator with 6 tubesheet sleeves and 6 welded CE sleeves in the "A"steam generator.

TABLE 6 (CON'T),

~

PAGE 29 OF 30

STEAM GENERATOR TUBE INSPECTION AND CORRECTIVE ACTION HISTORY COMMENTS FROM TABLE 6 (8)

The 34 tubes identified with crevice indications in the "A" steam generator inlet were repaired as follows:

10 tubes were mechanically plugged (CE Removable) 24 tubes were sleeved with CE 27" welded sleeves The 153 tubes identified with crevice indications in the "B'team generator inlet were repaired as follows:

72 tubes were mechanically plugged (CE Removable) 80 tubes were sleeved with CE 27" welded sleeves 1 CE welded sleeve (installed in 1987) was plugged with a CE welded sleeve plug due to rejection of the upper weld.

Other repairs required in the "B"steam generator are as follows:

2 BRW test brazed sleeves (installed in 1980) were plugged due to the loss of the primary to secondary pressure boundary as detected by Hydro Test.

5 Westinghouse explosive plugs installed prior to 1987 were removed due to leakage and replaced with CE welded plugs.

1 CE Mechanical plug on the cold leg was removed and replaced with a CE Mechanical plug 4

CE welded sleeves (installed in 1987), are considered leak limiters due to the marginal acceptance of the upper welds.

TABLE 6 (CONST)

PAGE 30 OF 30

(4

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