ML20236E920

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Forwards Steam Generator Tube Plugging Rept,Summarizing Tubes Plugged as Result of Insp Performed During Recently Completed Steam Generator Tube Rupture Outage
ML20236E920
Person / Time
Site: North Anna Dominion icon.png
Issue date: 10/26/1987
From: Stewart W
VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:
NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
87-663, NUDOCS 8710300064
Download: ML20236E920 (23)
v • d • e


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,. - i- . VIRGINIA ELbCTHIC AND POWER COMPANY Ricnwown, VIRGINIA 20261 w.L.sys w ur-

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October 26, 1987

l United States Nuclear Regulatory Commission' Serial No.87-663.. l Attention
Document Control Desk -N0/FFB .

j Washington, D. C. 20555 Docket-No. 50-338 ,

License No. NPF-4

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'i Gentlemen:

~I Virginia Electric'and Power Company 4

' North Anna Power Station Unit 1 I

. Steam Generator Tube Plugging Report 1 i

' Enclosed is- the ' Steam Generator Tube Plugging Report required by Technical Specification 4.4.5.5.a.. This is a summary of tubes plugged as'a result of the l inspection performed during the recently completed Unit 1 Steam' Generator Tube Rupture (SGTR) outage. Should you require additional information, the complet.e -

y report will be maintained on file at North Anna Power Station and the corporate f office, g

i Very..truly yours,

l. I b M. k W. L. Stewart .

1

Enclosure:

i Virginia Electric and Power Company North Anna Power Station Unit i Steam Generator Tube Plugging Report SGTR Outage - September / October 1987 p

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8710300064 871026  ;

PDR ADOCK 05000338 i a PDR j

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cc: U.S. Nuclear Regulatory Commission 101 Marietta Street, N.W.

Suite 2900-Atlanta, GA 30323 Mr. J. L. Caldwell NRC Senior Resident Inspector North Anna Power Station i

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l ENCLOSURE VIRGINIA ELECTRIC AND POWER COMPANY NORTH ANNA POWER STATION UNIT 1 STEAM GENERATOR TUBE PLUGGING REPORT SGTR OUTAGE - SEPTEMBER /0CTOBER. 1987 l

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Steam Generator Examination j Virginia Electric and Power Company '

North Anna Power Station Unit No. 1 Steam Generator's A, B. & C Tubes Plugged Summary l

l The attached tables list the. tubes plugged in North Anna Unit 1, during the 1987 SGTR outage.

i Table No. 1: Total number of tubes plugged during the 1987 SGTR outage in Steam Generator A.

Table No. 2: Total number of tubes plugged during the 1987 SGTR outage in Steam Generator B.

Table No. 3: Total number of tubes plugged during the 1987 SGTR outage in Steam Generator C. i i

The attached plots indicate tubes out of service for each steam generator:

Plot No. 1: Indicates location of tubes out of service prior to the 1987 SGTR outage.

Plot No. 2: Indicates location of tubes taken out of service during the 1987 SGTR outage.

Plot No. 3: Indicates location of tubes out of service following the 1987 l SGTR outage. l I

1 l

l

Tablo No. 1: Total number of tubes plugged during the 1987 SGTR outage in Steam Generator A.

1. The following tubes (25) were plugged based on eddy current indications. I Row Column Row Column '

l 4 19 28 48 27 30 31 48 j 38 33

  • 5 53 45 36 11 53 21 38- 45 54 **  ;

22 38 40 56 23 39 6 61 13 43 13 63 14 43 11 65 15 46 5 68 32 47 12 88 15 48 15 90 25 48

  • Plugged because of broken probe in tube.
    • Plugged because tube would not pass 8x1 probe. j i

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_ _ _ _ _ _ _ _ _ _ . _ _ _ _ _ _______ _ _ J

1 TableIh). 1 (Continued) Total number of tubes plugged during the 1987 SGTR outage in Steam Generator A.

i

2. The following tubes (80) are not properly supported by AVB or are adjacent to a plugged' tube that is.not properly supported by AVB. These tub es were plugged with. mechanical plugs on the hot leg side and with Sentinel plugs on the cold leg side.

Row Column Row Column i

9 2 9 45 10 2 10 45 8 3 9 46 10 3 10 46 11 3 11 46 12 3 9. 47 13 3 10 47 1 8 4 11 47 j 10 4 9 48 11 4 10 52 10 5 11 52 11 5 12 52 10 7 10 53 11 7 12 53 10 8 9 54 11 8 10 54 9 14 11 54 9 24 12 54 9 32 9 59 10 32 10 59 4 10 33 11 59 9 35 9 60 10 35 11 60 10 36 9 61 10 37 10 61 11 37 11 61 9 38 9 66 10 38 10 72 11 38 10 73 10 39 10 76 11 39 10 77 9 40 10 78 10 40 11 78 11 40 12 78 9 41 10 79 10 41 11 79 11 41 12 79 9' 42 10 93 9 43 11 93 10 44 12 93 i

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t_______________ _ _ _ _ _ _ _ _ _ _

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t Table No. 2: : Total number of tubes plugged'during the 1987 SGTR outage in Steam Generator B.

L 1. The following tubes (27) were plugged based on eddy current indications.

Row Column Row Column s 12 21 13 45 )

9 25 26 46 i 11 25 15 48 12 26 23 48 13 26 15 49 7 33 15 50 19 33 45 54

  • 44 33 3 58 12 34 2 59  !

28 34 19 62 11 35 29 70 16 35 8 77 39 35 4 79 22 37

  • Plugged because tube would not pass 8x1 probe.

I l

Table No. 2: (Continued) Total number of tubes plugged during the 1987 SGTR outage in Steam Generator B.

2. The following tubes (12) are not properly supported by AVB or are adjacent to a plugged tube.that.is not properly supported by AVB. These tubes were j plugged with mechancial plugs on the hot leg side and with Sentinel plugs j on the cold leg side.

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Row Column 10 2 11 2 11 3 12 3 13 3  ;

9 23 .

9 30 I 9- 34 .

9 44 l

10. 93 11 93 12 93 l

C________._______

4 Table No.3: Total number of tubes plugged during the 1987 SGTR outage in Steam Generator C.

1. The.following tubes (38) were plugged based on eddy current indications.

Row Column Row Column 4 3 12 43 4 8 13 43 37 25 13 44 9 27 14 44

-4 28 13 46 .!

4 29 13 47 12 29 14 47 15 30 24 47 5 31 32 47 22 31 11 48 5 32 13 48 9 32 31 49 21 32 46 49 19 34 10 51  :

13 36 11 51 20 38 2 54

  • 13 40 45 54 **

12 41 .. 16 71 1 42 41 *

  • 11 43
  • Plugged because of broken probe in tube.
    • . Plugged because tube would not pass 8x1 probe.

- _c____.__ _ __ _ _ - _ _ _

i Table No. 3 (Continued) Total number of tubes plugged during the 1987.  :

SGTR outage in Steam Generator C. l

2. The following tubes (58) are not properly supported by AVB or are adjacent' to a plugged tube that is not properly supported by AVB. These tubes were-plugged with a mechanical plug on the hot leg side and with a Sentinel plug on the cold leg side.

Row Column Row Column  !

10 2 11 30 11 2 9 31 12 2 10 31 10 3 11 31  ;

10 4 10 32 10 5 11 32 10 6 9 37 9 15 9 42 9 17 9 44 10 18 9 45 9- 19 10 45 i 10 19 9 46  !

10 20 10 46 10 '22 9 47  !

10 23 10 47 9 24 10 48 10 24- 9 49 11 24 9 56 9 25 9 61 10 25 9 63 11 25 9 64 10 26 9 65 11- 26 9 66 10 27 9 67 9 28 9 68 10 28 9 75 10 29 10 93 9 30 11 93 10 30 12 93 l

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3. The following tubes were plugged with a mechanical plug on the hot leg and  :

a Sentinel plug on the cold leg fdllmiing the stabilization of the failed

-tube (Row 9 Col. 51). ,

Row , IColum'n < Row Column .

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8 50 12 51 ]

9 50 8 52 /- l 10 50 9 52 -

11 50 10 52.

12 50 11 :52' i'l '

8 51 12 52 '

9 51

  • s 9

'* Failed tube. Stabilized the cold leg remnant with a hydraulically . expanded segmented spear; stabilized the hot leg remnant with a cable type stabilizer

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'j y extending from the hot . leg tube'nheet to approximately 30' past the tangent point. at the hot leg U-bend. Pressure boundary closure on the hot leg was accomplished with a mechanical plug; on the cold leg, a welded plug was used. '

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