ML20078B866

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Steam Generator Tube Inservice Insp Rept,Core 1 Refueling Outage
ML20078B866
Person / Time
Site: Sequoyah Tennessee Valley Authority icon.png
Issue date: 09/30/1982
From:
TENNESSEE VALLEY AUTHORITY
To:
Shared Package
ML20078B861 List:
References
NUDOCS 8309270287
Download: ML20078B866 (8)


Text

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STEAM GENERATOR TUBE INSERVICE INSPECTION REPORT SEQUOYAH NUCLEAR PLANT UNIT 1

- CYCLE 1 REFUELING OUTAGE SEPTEMBER 1982 i

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8309270287 030921 il\? PDR ADOCK 05000327 G .. _ .

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. CONTENTS TABLE I - Inspection Summary TABLE II - Inspection Summary S/G 1 TABLE III - Inspection Summary S/G 4 TABLE IV - tubes Recording Da'm age in S/G 1 TABLE V - Tutes Recording Damage f ri S/G 4 FIGURE 1 - Dent Size Frequency Distribution for S/G 4 Tubes Tested in 1981 and 1982 4

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I INSPECTION

SUMMARY

- SEOUOYAll UNIT #1 Steam Generators il & #4 f

S/G #1 S/G $4 Totals Inlet Outlet Inlet Outlet i

Tubes In Steam Generator '

(Straight Lengths) 13,552 3388 3388 3388 3388 Total Tubes Inspected (Straight Lengths) 525 267

, 0 220 39 Tubes Recording Severe Damage .'

(Approximate Wall Loss 40% a Greater) 0 0 0 ,0, 0 Tubes Recording Moderate Damage (Approximate Wall Loss 20% to 39%) 8 3* 0 5* 0 ,

Tubes Recording Minor Damage (Approximate Wall Loss Less Than 20%) 29 16 0 12 1 S/G ll: 2 tubes with lane blocker damag'e unchanged since 1981 1 tube recorded indication unchanged f rom baseline inspection S/G #4:

  • all 5 tubes recorded indications unchanged from baseline inspection 4

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. TABLE II INSPECTION

SUMMARY

Sequoyah Unit'#1 - Steam Generator $1 Total Hot Leg Cold Leg Tubes In Steam Generator $

(Straight Lengths) 6776 3388 3333 Tubes Inspected -

3 (Straight Lengths) 267 267 0 Tubes Recording Severe Damage (Approximate Wall Loss 40% & Greater) 0 0 0 Tubes Recording Moderate Damage (Approximate Wall Loss 20% to 39%) 3 3* 0 Tubes Recording Minor Damage (Approximate Wall Loss Less Than 20%) 16 16 0 Tubes Inspected For Row #1 U-Bend 184 92 92 Additional Inspected By Hand Probing 6 6 0 2 tubes with lane blocker damage present in 1981 1 tube recorded indication at baseline and is unchanged l

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TABLE III INSPECTION

SUMMARY

Sequoyah Unit #1 - Steam Generator #4 Total Hot Leg Co'1d Lee Tubes In Steam Generator (Straight Lengths) 6776 3388 3383 s i Tubes Inspected

( Straight Lengths) 258 220 38 Tubes Recording Severe Damage (Apprcximate Wall Loss 40% & Greater) 0 0 0 Tubes Recording Moderate Damage (Approximate Wall Loss 20% to 39%) 5 5* 0 Tubes Recording Minor Damage -

(Approximate Wall Loss Less Than 20%) 13 12 1 Tubes Inspected For Row #1 U-Bend 8 8 0 All indications were recorded by baseline inspection and are unchanged.

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XAdLE IV TUBES RECORDING DAMAGE IN STEKM GENERATOR S1

, Sequoyah Unit #1 Tube i Defect R C Oricin  % Location Notes INLET (HOT LEG)

, 1 1 OD 30 TS-1 External damage near lane bl-

device. Present in 1981 inspection.

1 5 ID 20 TS-1 : Internal imperfection unchanged-since 1981 inspection.

1 6 ID 20 TS-1 Internal imperfection unchanged since 1981 inspection. '

1 26 OD 20 2-3 Small volume external imperfection.

, Nct recognizable on-baseline.

1 78 OD 20 3-4 Small volume external imperfection.

Not recognizable at 400 kHz channel in 1982 inspection. Not recognizable on baseline.

1 90 OD 30 TS-1 External damage near lane blocker device. Unchanged since 1981 inspection.

1 91 00 20 TS-1 External damage near lane blocker device. Unchanged since 1981 inspection. -

1 92 OD 20 TS-1 External degradation near lane blocker device, unchanged since 1981 inspection.

1 94 OD 20 TS-1 External degradation near lane blocker device, unchanged since 1981 inspection.

5 26 OD 20 1-2 External imperfection, present on baseline.

5 61 ID 25 6-7 Internal flaw, present on baseline.

5 76 ID 20 TS-1 Internal imperfection present on baseline.

9 36 ID 20 6-7 Internal imperfection, not recognizable on baseline.

13 11 ID 20 TS-1 Internal imperfection, not recognizable on baseline.

17 16 ID 20 5-6 Internal imperfection, not recognizable on baseline.

25 36 ID 20 5-6 Internal imperfection, not recognizable on baseline.

25 51 ID 20 6-7 Internal imperfection, not recognizable on baseline.

29 11 ID 20 2-3 Internal imperfection, not recognizable on baseline.

41 26 ID 20 TS-2 Multiple internal imperfections.

Not recognizable on baseline.

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TUBES RECORDING DAMAGE IN STEAM GENERATOR 44 Sequoyah Unit #1

. ' Tube f Defect R C Oricin  % Location- Notes INLUT (HOT LEG)

-1 3 ID <'20 TS-1 & 2-3 Multiple' internal imperfections,

-' unchanged since 1981 inspection.

51 56 ID < 20 1-2, 2-3 & .

3-4 Multiple internal imperfections,.

present on baseline.

13 61 ID < 20 TS-1 Internal imperfection. Not -

. recognizable on baseline.

. 17 56 ID 30 4-5 Inte rnal flaw, present on baseline.

17 81 ID < 20 1-2 & 3-4 Multiple internal imperfections, present on baseline.

25 31 ID < 20 7-U-bend Internal imperfection unchanged since 1981 inspection; present on baseline.

25 81 ID < 20 5-6 Internal imperfection. Not

, recognizable on baseline.

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29 11 ID < 20 TS-1 Internal imperfection unchanged since 1981 inspection; present on baseline.

29-56 ID < 20 TS-1 Internal imperfection present on baseline.

29-83 ID 30 5-6 Internal flaw, unchangel since 1981pinspection; present on baseline.

30-46 ID 25 2-3 & 3-4 Mult'iple internal flaws, present i on baseline.

H 33 46 ID < 20 4-5 Internal imperfection. Not recognizable on baseline.

Intbrnal imperfection.

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33 76 ID < 20 2-3 Not recognizable on baseline.

34 79 ID < 20 TS-1, 1-2

& 5-6' Multiple internal imperfections, unchanged since 1981 inspection; present on baseline. '

37 20 ID <20' l-2 & 67 b Multiple-internal imperfections.

37 35 ID 30 TS-1 Internal f'l aw , recorded in 1981 inspection (25 % ) '; present on

,. . baseline.

46 45 ID 25 4-5 ' Internal flaw; present on baseline.

UTLET (COLD LEG)

. 41 13 ID < 20 CTS-Cl Internal imperfection unchanged sincp 1981 inspection.

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