ML20154K158

Forwards Rept Re SG Tube Plugging Which Occurred During Unit 1 Cycle 9 Refueling Outage,Per TS 4.4.5.5.a.ISI of Unit 1 SG Was Completed on 980930

ML20154K158
Person / Time
Site:	Sequoyah
Issue date:	10/13/1998
From:	Salas P TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NUDOCS 9810160134
Download: ML20154K158 (8)

Text

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nn Tennessee Vaney Authonty Post Othce Box 2000 Soddy Daisy. Tennessee 37379 October 13, 1998 U.S.

Nuclear Regulatory Commission ATTN:

Document Control Desk Washington, D.C.

20555 Gentlemen:

In the Matter

)

Docket No. 50-327 Tennessee Valley Authority

)

SEQUOYAH NUCLEAR PLANT (SQN) - UNIT 1 STEAM GENERATOR (SG)

TUBE PLUGGING REPORT AND NOTIFICATION OF UNIT 1 SG TUBE INSPECTIONS - UNIT,1 CYCLE 91 REFUELING OUTAGE

,c As required by'SQN Technical Specification (TS) 4.4.5.5.a, this submittal provides a report of SG tube plugging during the Unit 1 Cycle 9 refueling outage.

The in-service inspection (ISI) of the Unit 1 SG tubes was completed on September 30, 1998.

In accordance with SON TS 4.4.5.5.b, TVA will submit a special report of the results of this inspection on or before September 30, 1999.

Pursuant to the reporting requirements of TS 4.4.5.5.c, NRC was notified of the SG tube inspections that fell into Category C-3.

Notification of these results was made during a telephone conference call on September 29, 1998.

In accordance with SQN TS 3/4.4.5, SGs 3 and 4 U-Bend inspections were classified as Category C-3.

The initial Row 1 and 2 U-Bend Plus-Point examination sang'_es were 146 tubes in SG 3 and 155 tubes in SG 4.

There were two tubes in SG 3 and three tubes in SG 4 that were determined to have primary water stress corrosion cracking (PWSCC).

These tubes are located in Row 1.

Since 100 percent of the Row 1 and 2 tubes were examined, no expansion was necessary.

TS 4.4.5.5.c also requires a written follow-up report.

TVA plans to provide this information in conjunction with SQN's 90-day alternate plugging report.

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e U.S.. Nuclear Regulatory Commi~ssion

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October 13, 1998 In accordance-with TS 4.4.5.5.d, notification was made to the l

L estaff during two conference calls on1 September 29 and' October 2, 1998.

The September conference call provided notification regarding four SG tubes having indications attributable to PWSCC.

The October conference call provided notification of a tube having both a circumferencial and an axial indication in the same tube support plate.

This indication was identified initially by bobbin examination as 1

an indication that would require a retest using a rotating

- coil.

The Plus-Point coil identified a circumferential.and axial'outside diameter stress corrosion cracking at the first hot support plate.

This tube was removed from service by l

- plugging.

Enclosed is a summary of the tubes plugged during the Unit 1 Cycle 9. refueling outage.

-]

i Please direct questions concerning this i ssue to me at' (423) 843-7170 or~J.

D. Smith at (423) 843-6672.

Sincerely, Pedro Salas Site Licensing and Industry Affairs Manager cc (Enclosure):

Mr.

R. W.

Hernan, Project Manager L

l Nuclear Regulatory Commission One White Flint, North 11555 Rockville Pike Rockville, Maryland 20852-2739 NRC Resident Inspector Sequoyah Nuclear Plant L

2600 Igou Ferry Road Soddy-Daisy, Tennessee 37379-3624 l

-Regional Administrator U.S.

Nuclear Regulatory Commission Region II Atlanta Federal Center l

61 Forsyth St.,

SW, Suite 23T85 Atlanta, Georgia 30303-3415

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t ENCLOSURE SEQUOYAH NUCLEAR PLANT UNIT 1 CYCLE 9 REFUELING OUTAGE STEAM GENERATOR TUBE' PLUGGING REPORT l

j

1 1

Steam Generator 15 Day Plugging Report Sequoyah Unit 1 Cycle 9 SG ROW COL INDICATION LOCATION RESOLUTION 1

1 39 SAI H07+10.57 PLUG 1

2 52 SAI HTS.29 PLUG 1

3 59 SAI H01+.51 PLUG 1

4 54 SAI HTS-2.01 PLUG 1

7 47 SCI H01+.00 PLUG 1

9 2

SCI H01+.01 PLUG / STABILIZE 1

17 55 SAI H01+.58 PLUG 1

23 88 SAI H01+.00 PLUG 1

26 41 SCI HTS.04 PLUG 1

35 77 SCI HTS +.00 PLUG / STABILIZE Total Number of Tubes Plugged This Generator =10 2

2 92 PTE HTS +.00 PLUG PREVENTIVELY 2

4 15 PI H02.06

'ULL/ PLUG 2

4 36 SAI HTS +.15 PLUG 2

8 32 41 H01.17 PLUG 2

10 25 SCI HTS.19 PLUG 2

10 34 36 H01+.06 PLUG 2

11 25 SCI HTS.17 PLUG 2

13 17 SCI HTS.12 PLUG 2

13 18 SCI HTS.14 PLUG 2

14 33 56 H02.12 PLUG 2

15 29 SCI HTS.10 PLUG 2

16 33 MCI H02+.12 PLUG / STABILIZE 2

16 53 SCI HTS.07 PLUG 2

16 78 SAI HTS-2.74 PLUG 2

17 30 SCI HTS.11 PLUG 2

18 30 59 H01.17 PLUG 2

19 24 SCI HTS.08 PLUG SAI = Single Axial Indication SCI = Single Circumferential Indication MCI = Multiple Circumferential Indication BLG = Bulge PTE = Partial Tubesheet Expansion PI = Axial ODSCC where APC applies i

~

j Steam Generator 15 Day Plugging Report Sequoyah Unit 1 Cycle 9 SG' ROW COL INDICATION LOCATION RESOLUTION 2

22 34 SCI HTS +.04'

' PLUG / STABILIZE 2

23 33 SCI HTS.03 PLUG 2

25 65 SCI HTS.08 PLUG 2

26 27 SCI HTS.08 PLUG 2

26 50 SCI HTS.06 PLUG 2

29 56 SCI HTS.13 PLUG Total Number of Tubes Plugged This Generator =23 3

1 89 SAI H07+3.60 PLUG 3

1 90 SAI H07+10.45 PLUG 3

3 53 42 H01.12 PLUG 3

58 52 H01.04 PLUG l

3 4

60 SCI H01+.02 PLUG 3

5 62 30 H01+.00 PLUG 3

6 45 44 H03.09 PLUG 3

6 54 SCI H04.21 PLUG 3

6 64 SAI HTS.29 PLUG 3

6 74 55 H01.30 PLUG 3

7 36 46 H05.08 PLUG 3

7 54 SCI H01+ 11 PLUG i

3 7

76 40 H02.24 PLUG 3

7 83 40 H01+.37 PLUG 3

8 3

49 H03.05 PLOG 3

9 67 43 H02+.05 PLUG 3

9 83 18 H01.07 PLUG 3

9 86 SAI H01+.01 PLUG 3

10 36 46 H01.06 PLUG 3

10 41 40 H01.14 PLUG 3

10 54 SCI HTS +.06 PLUG 3

10 85 80 H01.20 PLUG l

i l

l i

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I i l

l j

Steam Generator 15 Day Plugging Report Sequoyah Unit 1 Cycle 9 l

SG ROW COL INDICATION LOCATION RESOLUTION 3

11 19 SCI HTS.07 PLUG 3

11 74 46 H01 51 PLUG 3

12 48 SAI HTS.19 PLUG 3

12 71 SAI H01.06 PLUG 3

12 81 SAI H01+.67 PLUG 3

14 57 49 H01.06 PLUG l

3 14 84 41 H01.27 PLUG l

3 15 62 SCI H01+.17 PLUG 3

16 43 SCI HTS.12 PLUG 3

16 69 39 H01+.46 PLUG 3

18 74 51 H01+.31 PLUG 3

19 68 SCI H01+.03 PLUG 3

21 46 SC1 H01+.15 PLUG 3

21 74 SCI M01+.00 PLUG 3

23 76 57 HG2.18 PLUG 3

24 80 40 H01.19 PLUG 3

24 81 SCI H02.12 PLUG / STABILIZE 3

24 85 54 H01.03 PLUG 3

25 62 44 H01+.41 PLUG 3

25 76 SAI H01+.06 PLUG 3

26 75 SCI H01.15 PLUG 3

28 80 SCI H01+.01 PLUG / STABILIZE 3

29 80 44 H01.25 PLUG l

3 32 70 SCI H01+.17 PLUG 3

33 79 40 H01.01 PLUG 3

34 52 41 H01+.12 PLUG 3

34 72 SCI H02.10 PLUG / STABILIZE 3

34 76 BLG HTS +.00 PLUG / STABILIZE j

3 35 41 42 AV3+.03 PLUG 3

42 56 BLG HTS +3.55 PLUG / STABILIZE I

3 42 60 44 H03.11 PLUG 3

43 38 45 H01.18 PLUG 1

3 45 52 46 H02.07 PLUG i

i Total Number of Tubes Plugged This Generator =55 l

! u

Steam Generator 15 Day Plugging Report Sequoyah Unit 1 Cycle 9 SG ROW COL INDICATION LOCATION RESOLUTION 4

1 4

SAI HTS.56 PLUG 4

1 27 SCI H03+.30 PLUG 4

1 77 SCI H07+3.68 PLUG 4

1 80 SAI H07+2.93

' PLUG 4

1 81 SAI H07+4.07 PLUG 4

2 11 SCI H01.17 PLUG 4

2 56 43 H01.25 PLUG 4

3 12 SCI H01+.14 PLUG 4

3 16 SCI H01.15 PLUG 4

3 75 49 H02.10 PLUG 4

4 50 SCI H01+.30 PLUG 4

5 33 SCI H01.24 PLUG 4

6-15 SCI H03.07 PLUG 4

6 18 SCI H03.25 PLUG-4 7

10 SCI H01.19 PLUG 4

7 75 52 H01+.06 PLUG 4

8 46 SAI HTS.34 PLUG 4

9 38 SCI H01+.21 PLUG 4

10 4

40 H01+.03 PLUG 4

11 35 45 H04+.22 PLUG 4

11 77 52 H03.27 PLUG 4

12 29 SCI HTS.09 PLUG 4

13 15 SAI HTS 35 PLUG 4

13 37 SCI HTS.11 PLUG 4

13 46 SCI HTS.15 PLUG 4

13 61 97 H03.40 PLUG 4

15 59 38 H02.59 PLUG 1

i S$eam Generator 15 Day Plugging Report Sequoyah Unit 1 Cycle 9 SG ROW COL INDICATION LOCATION RESOLUTION 4

17 11 38 H01+.39 PLUG 4

17 53 40 H01.14 PLUG 4

18 33 SCI HTS.69 PLUG 4

20 44 SCI H01+.00 PLUG 4

21 57 35 H01+.40 PLUG 4

23 43 43 H01+.39 PLUG 4

25 22 MCI H01.03 PLUG 4

26 12 SAI H01+.00 PLUG 4

26 63 46 H02.29 PLUG 4

28 24 SCI H01+.00 PLUG 4

28 52 52 H01.09 PLUG 4

31 18 57 H01.33 PLUG 1

4 38 38 SCI H01.11 PLUG / STABILIZE 4

39 36 SCI H01-.11 PLUG 4

41 27 SAI HTS.10 PLUG Total Number of Tubes Plugged This Generator =42 i

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