ML20128F934

Forwards Eddy Current Exam,Ue Callaway Nuclear Power Station,Unit 1 SGs B & C. Rept Documents Final Conam Insp Results.Special Rept 92-03 Consisting of Results of Sixth SG Tube ISI Also Encl

ML20128F934
Person / Time
Site:	Callaway
Issue date:	01/29/1993
From:	Campbell W UNION ELECTRIC CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML20128F938	List: ML20128F934 ML20128F947
References
ULNRC-2757, NUDOCS 9302120086
Download: ML20128F934 (16)

Text

canunam Pau Cnia Bu (20

. * ': funan. Macun liS251' Union January 29,1993 Etscrusc a

U. S. Nuclear Regulatory Commission Document Control Desk Washington, D. C. 20555 ULNRC-2757 Gentlemen:

DOCKET NUMlu.R 50-483 CALLAWAY PLANT UNIT I FACILITY OPERATING Ln~FESE NPF SPECIAL REPORT 92-03' (SOS 92-1293)

RESULTS OF TIIE SIXTII STEAM GENERATOR TlillE INSERVICE INSPECTION Ref: ULNRC-2637, dated 5/13/92 The enclosed Special Report is submitted pursuant to the requirements of Callaway Technical Specification 4.4.5.5.b concerning the sixth Inservice Eddy Current Inspection of Steam Generators 'B' and 'C' performed in April 1992, during Callaway Plant's fifth refueling outage. This report documents'the final Conam inspection results.

/

L W. R. Campbell-'

l Manager, Callaway Plant WRC/SES/MAIUlrj Attachments: 1) Tables 1 & 2-

2) Eddy Current Examination Conam Nuclear, Inc.  :

cc: Distribution attached

!- 9302120086 930129 3

. DR -ADOCK 0500 aA Qk.

+ ,

• \

+

cc distribution for ULNRC-2757 hir. A. Bert Davis' hir. L. Raynard Wharton

-Regional Administrator ' U. S. Nuclear Regulatory Commission U. S. Nuclear Regulatory Commission OWFN -hiail Stop 13E21 Washington, D. C. 20$55

~

Region III 799 Roosevelt Road Glen Ellyn,IL 60137 hianager, Electric Department hir. Art hiah hiissouri Public Service Commission Wolf Creek Nuclear Operating Corp.

P. O. Box 360 P. O. Box 411

-Jefferson City, hiO 65102 Burlington, Kansas,66839 Records Center . hir. I. N. Jackiw Institute of Nuclear Power Operations Chief, Project Section 3C. .

Suite 1500 U. S. Nuclear Regulatory Commission 1100 Circle 75 Parkway Region IIIJ _ .

Atlanta, GA 30339 799 Roosevelt Road' .

Glen Ellyn, IL -60137 '

NRC Senior Resident Inspector

_ . , . . v. m-y

EDDY CURRENT EXAMINATION UNION ELECTRIC COMPANY CALLAWAY, UNIT 1 STEAM GENERATORS B & C APRIL 1992 o

CONAM NUCLEAR, INC

a

s SPECIAL REPORT 92-03 RESULTS OF SIXTII STEAM GENERATOR tulle INSERVICE INSPECTION This report is submitted in accordance with Technical Specification (T/S) 4.4.5.5.b which states:

"The complete results of the steam generator tube inservice inspection shall be I

submitted to the Commission in a Special Report pursuant to Specification 6,9.2 within 12 months following the completion of the inspection.

This Special Report shallinclude:

(1) Number and extent of tubes inspected, (2) Location and percent <3 all-thickness penetration for each indication of an imperfection, a...

(3) Identification of tubes plugged."

In April 1992, with the plant in Mode 6 - Refueling for the fillh refueling outage, the sixth plant Steam Generator (S/G) Eddy Current Inservice Inspection was performed. S/G's _'B' and 'C' were inspected. The inspection was performed by Conam Nuclear, Inc. and their formal results are detailed in the Eddy Current Examination (ECE) which is submitted with this Special Report.

Although the Conam ECE provides details on the inspection, the results are summarized below and are numbered to correspond with the information requested by T/S'4.4.5.5.b:

(1) Number / Extent ofInspected Tubes (a) Inspection Summary:

S/G 'II' S/G 'C' S/G 'D' Tubes Plugged (Refuel 5) 15 14 2 Tubes Previously Plugged 9 19 28 Total Tubes Plugged 24 33 -30

Page 2 SPECIAL REPORT 92-03 S/G 'll' S/G 'C' Tubes evaluated with 5617 5607 standard bobbin coil

^

Tubes plugged previously 9 19 '

~

Total Tubes 5626 5626 Tubes further evaluated with MRPC probes' .

l 0711 - 07C 0 244 03C - 02C 2 1 04C - 03C 0 2 OlC - TSC 0 1 ,

FBC - TSC 0 1 FEH - FBH 0 1 -

TSH - FBli 1 0-TSH - TSH 603 4 05C - 05C 1 0 OIC - OlC 1 0 TSC - TSC 4 4 07C - 07C 0 1 4

OlH - OlH 0 1 Tubes evaluated with probetype 8xt:

07H - 07C 0 11

. (

Page 3 -

SPECIAL REPORT 92-03 (b) Steam Generator 'B' One hundred percent of the unplugged tubes or five thousand six-hundred seventeen (5617) tubes were tested fu!! length using the standard bobbin coil probe. In addition to the bobbin probe examination,603 hot leg tube sheet interfaces were examined using a three-coil MRPC (motorized rotating pancake coil) probe.

This probe utilizes one pancake coil, one coil sensitive to axial indications and one coil sensitive to circumferential indications.

There were no indications reported at the tube sheet interface, During this outage, there were eleven (11) tubes plugged in Steam Generator 'B' for anti-vibration bar (AVB) indications above 40 percent .

through wall depth. Union Electric elected to plug four (4) additional q tubes with indications above 35%. -

(c) Steam Generator 'C';

One hundred percent of the unplugged tubes or five thousand six hundred seven (5607) tubes were tested full length using the bobbin coil probe. In addition to the bobbin probe examination,- all Row I and 2 U-bends were examined with a three-coil MRPC probe.

Fourteen (14) tubes were plugged in Steam Generator 'C'. Seven (7) tubes were pluggeo when anti-vibration bar indications exceeded 40 [

percent. Union Electric elected to plug seven (7) additional tubes with indications of 29,33,36,37,38,39 percent, and an undefined '

indication (UDI).

y

Page 4 SPECIAL REPORT 92-03 Tube, Row 2 Column 98, was reported as having an UDI 1-1/2 above the seventh cold leg support plate. As a result of this anomaly, this tube was included in the fourteen (14) removed from service. Another tube, Row 40 Column 106, was reported as having an indication at the fourth AVB that measured 79 percent through wall with a voltage response of 34 volts This large volume indication prompted an 8xl probe (8 surface-riding coils) examination of selected tubes with AVB wear =

indications to determine if the wear was on one or two sides of the tube. The results of this 8xl examination showed that all AVB indications were on one side of the tube only, (2) Location / Percent of Wall-Thickness Penetration for Each Indication of Imperfection See Tables 1 and 2 (Percent of wall-thickness penetrations are shown for indications >f > 15%j (3) Identification ofTubes Plugged from the Sixth In crvice Inspection Union F..ctric replaced all Westinghouse Inconel 600 mechanical tube plugs in the hot legs of all four (4) steam generators with Inconel 690 plugs.

Thirty-seven (37) plugs were replaced: 6 in S/G 'A', 6 in S/G 'B',

15 in S/G 'C', and 10 in S/G 'D'. All tubes plugged in the sixth inservice inspection used Inconel 690 plugs.

IL Page$

3PECIAL REPOllT 92-03 STEAM GENERATOR 'll STEAM GENERATOR 'C'

% INI)l-  % INI)),-

ROW COI,11M N CATION ItOW C O I,II M N CATION 30 9 35 32 10 38 41 19 44 41 19 39 41 20 49 44 22 51 41 22 38 43 23 44 49 28 41 44 23 33 51 32 44 45 24 29 51 69 T9 45 34 53 23 70 39 12 56 41 47 73 48 41 64 51 51 73 48 2 98 UDI 32 81 47 44 101 57 47 84 46 41 104 37 51 93 42 40 105 36 44 101 56 40 106 79 32 113 44

Page 6 3PECIAL REPORT 92-03 In addition, two tubes were plugged in S/G 'D' as a precautionary measure, using data from the fifth inservice inspection. These tubes were plugged since they were of a similar profile to a tube plugged in the 'C' S/G. The tubes are:

S/G 'If Ro_w Cohen ,

33 11 15 37 KEY - TAllI.ES 1 AND 2 avl,2,3,4,5,6 - Anti-Vibration Bars 0211,07H,07C, etc. - Tube Support Plate Numbers / Cold Leg (C), Hot Leg (H)

TSH - Tubesheet Hot

j SPECIAL REPORT

' TABLE 1 TUBE IMPERFECTIONS - STEAM GENERATOR 'B' _ _ _

INDICATION % _ _

INCH (+) FROM - _

ROW COLUMN WALL THINNING LOCATION LOCATION-29 9 27' AV5- 0.00 30 9 35 AV2 0.00 30 9 24 AV5 0.00 32 11 28- /.V6 0.00-32 12 32 AV4 0.00 33 12 20 AV3 0.00 37 18 25 AV2 0.00 37 18 28 AV3 0.00 39 18 24 AV4 -0.00 t 36 19 24 AV3 0.00-37 19 25 AV4 0.00 41 19 44 AV4 0.00-37 20- 28 AV4 0.00-41 20 31 'AV3 0.00-41 20 49 AV4 0.00 41 20 34 AV5 0.00' 41 22 38 AV4 0.00 42 23 20 AV4 0.00-42 24 21 AV2. 0.00 42 24 28 AV4 0.00' 42 24- 23 AV5 '0.00

.45 24 28- AVS 0.00 5 27 20 06H 2.71 49 28 26 AV2 0.00 49 28 33 'AV3 0.00 ,

49 28 37 AV4 . 0.00 ^

49 28 41- AV5 0.00 49 28 24- AV6 0.00 50- 28 26- AV5- 0.00.-

I' 49 31 25 AV5 0.00 Page 1 of 5-

4 SPECIAL REPORT--

TABLE 1 TUBE IMPERFECTIONS - STEAM GENERATOR 'B' - -

INDICATION % , INCH ( +) FROM ROW COLUMN - WALL THINNING LOCATION - - LOCATION 39 32 20 AV2- 0.00-1 51  ?? 44 AV2 -0.00 51 32 35 -AV3 0.00-

-51 32 39 AV4 0.00 51' 32 -30 AV5- 0.00 49 33 29 AV2 0.00  ;

49 33 31 AV3 0.00' 41 35- 21 AVS 0.00 32 40 27 OH1 27.79 26 4J 21 AV2 0.00 26 43 24 AV6 -0.00 35 43 31 AV3 0.00-35 45 26 AV3 0.00 35' 45 21 AV5 0.00 47- 45 29 AV3 0.00 47 45 20- AV4 0.00 50 47 23 -AV3 0.00 50 47 27 AV4 0.00

'50 47 30 AV5 0.00 50 47 -21 AV6 0.00-

'39 49 21 AV3- 0.00 .-

50 .53 28. AV4 0.00-26 54 30 -01H 28.25

--47 59 ~ 24- AV4_  : 0.00 -_

27 63 23- 06H- 0.00 40 64 3S AV3 0.00 -

40 64' 23 AV4 -0.00 26 -65 25 AV5 0.00-47 ~65 20 AV1- 'O 00 Page 2 of 5

1. 4, 4 h-

[ SPECIAL REPORT.

. TABLE 1-TUBE IMPERFECTIONS STEAM GENERATOR 'B' INDICATION % INCH ( & ) FROM ROW COLUMN Wall THINNING - LOCATION LOCATION-47 65 20- AV3. 0.001 47 65 37 AV4 0.00 -

40 66 27 AV4- 0.00 47 G6 '25 AV2 0.00.

54 67 25 ~AV4 0.00 41 68 33 AV2 0.00 42 68 24 AV3 0.00 42 68 25 AV4 'O.00 42 68 23 AV6 0.00 47 69 26 AV2 0.00-51 69 31 AV2- 0.00 51 69 34 AV3 . 0.00 51 69 39 AV4 0.00-51 69 38 AV5 -0.00 12 70 24 02C -27.00 23 70 39- AV6' O.00 55 71 24 AV4 ;0.00 55 71 24 -AV5 0,001 55 71 23 AV6- - 0.00:

50 72 22 -AV3 - 0.00 ~

~

47 73 39' .-AV3 0.00 47 73 48 AV4 0.00 51 73 30- AV3= -

= 0.00 -

51. '73 48: AV4 - 0.00:

51 73 32 AV5 0,00-51 73- 24 AV6 10.00-41' 74 '35 AV4 0.00 L 41 74- 37- AV5- 50.00 -

37 76 -32. AV4 -0.00 37 76- 23_ AV5 0.00 _

32 81- 30 -AV1 'O 00.

Page 3 of 5

l SPECIAL REPORT '

- TABLE 1 TUBE IMPERFECTIONS STEAM GENERATOR 'B':

INDICATION % INCHl + ) FROM. '

ROW COLUMN WALL THINNING- LOCATION LOCATION :

l 32 81 27 AV2: -0.00 32 81 27 AV3 0.00 32 81 32 AV4- 0.00-32 81 47 -AV5' O.00 26 83 24 AV5 0.00 ~

29 -84 25 04H' 29.00-47 84 43 AV2 0.00 47 84 46 AV3- 0.00 47' 84 37 AV4 0.00 -'

47 84 22 AV5 0.00' 43 85 21 AV3- 0,00 46 86 24 AV3 0.00 50 86 34 AV4 0.00 50 86 36 AV5 0.00 46 88 20 -AV2 0.00- .

'40 0.00-89 35 AV3 40 89 28 AV4 0.00 42 90 25 AV4. 0.00 --

46 '91 22 AV2- -O 00 46 91 24 AV4- 0.00 50 91 27 AV1 0.00 50 91 21 AV3 . 0.00.

50 91' 32 AV4 0.00' 51' 93 22' AV3 0.00-51 93 39 AV4 0.00 51 93 42 AVS 0.00 51 93 29 .AV6 0.00-

'42 ' 98' 27 AV3 O.00.

42 98 27 AV5 0.00 -

44 98 28 AV5 0.00 48 98 21 AV4 0.00 ,

Page 4 of 5 -

- - ~

SPECIAL REPORT ,

. TABLE 1 TUBE IMPERFECTIONS - STEAM GENERATOR 'B' INDICATION % INCH (+) FROM ROW - COLUMN WALL THINNING LOCATION LOCATION 40 100 22 AV3 0.00 41 100 22 AV5 0.00 44 101 39 AV2 0.00 44 - 101 33 AV4 0.00 44 101 56 AV5 0.00 44 101 25 AV6 0.00 34 110 25 AV3 0.00-32 112 22 s V5 - 0.00 30 113 21 AV5 0.00 32 113 25 AV2 0.00 32 113 41 AVS 0.00 Page 5 of 5

'. , a, _

1 SPECIAL REPORT TABLE 2 TUBE IMTERFECTIONS - STEAM GENERATOR 'C' INDICATION % INCH (+) FROM ROW COLUMN - WALL THINNING LOCATION ' LOCATION -

28 8 31 AV1- 0.00 3 29 9 20 AV5 0.00 32 10 38 AV2 0.00 32 10 32 AV5 ' O.00 34 15 20 AV2 0.00 37 18 25 AV3 0.00 37 19 20 AV3 0.00 41 19 39 AV2 0.00 41 19 31 AV3 0.00 41 19 25 AV4- 0.00 40 20 22 AV4 0.00 ~ ,

44 22 51 AV4 0.00 44 22 48 AVS 0.00 43 23 44 AV5- 0.00-44 23 22 AV4 0.00 44 23 33 -AVS 0.00 45 24 29 AV5 0.00 50 28 24 AV5 0.00 50 28 22 AV6 0.00 45 34 22' -AV3 0.00 45 34 53 AV4 0.00 46 35 22 AV4 0.00 40 37 27 AV3 0.00 r .40 37 25 AV4 0.00 46 37 27 AV4 -O.00 L 27 39 25 'AV5 0.00 l

50 45 21 AV2 0.00 l 50 45 22 AV3 0.00 t-l' L

L Page 1 of 3 l

. . - ~ - , ,

i

-t . , .

l m J. .

- SPECIAL REPORT 4- TABLE 2 TUBE IMPERFECTIONS STEAM GENERATOR 'C' INDICATION % INCHl+) FROM:

ROW- COLUMN - WALL THINNING- . LOCATION . - LOCATION 50 45- 30- AV4 0.00 --

49 48 25 AV3 0.00 16 50 28 04C: 23.30 .

12 56 41 TSH -0.86 46 56 24 AV4 0.00 51 57 22 07H- 0.57 47 58 21 AV4- 0[00

-18 63 21 AV5 0.00 54 63 36 AV3 -0.00

-0.00 54 63 34 AV4 54 63 30 AV6- 0.00

-41 64 51' AV2 0.00-41 64 20- AV3.- 0.00 41 64 20 AV5 0.00 38 71 39' '03C 29.01 l 44 71 32 AV4 0.00 ~

44 71 34 AV5 0.00-7 77 '21. .TSH 25.30 41 81 -23 AV3 0.00 53 90 31 AV5 0.00 47 91 31 AV4 0.00'

47. 24- AV5 10.00--

49 :93 24 'AV5 0.00

_43 94 24 AV4 0.00

_ - -49 95 26 AV4 0.00 Page 2 of 3 w %-- g y v , + -

4 -

.c.

] . ..

. SPECIAL REPORT . ,

TABLE 2.

. TUBE IMPERFECTIONS - STEAM GENERATOR .'C'-

INDICATION % INCH ( +1 FROM ROW COLUMN -- WALL THINNING- _ LOCATION LOCATION _ j 40 100' 22 -AV5 -0.00-44 101 39 AV3 0.00 = {

44 101 31 AV4 0.00 44 101 57 AV5 l 0.00 -

45 101 32 AV4 0.00 -- y 40 103 28 AV5 0.00: -j

=41 104 25 AV3 0.00 41 104 37 AV4 0.00 j 41 104 27 AV6 0.00 s

39 105 24 AV4- 0.00- 4 40 105 -36 AV4 0.00-41 105- 28 =AV4 0.00 41 105 33 AV5 0.00 41- 105 AV6 0.00

=

21 40 106 26 AV3' .0.00 ,

40 106 79 AV4' O.00 40 106 20 AVS 0,00 t 40 106 45 AV6 0.00 17 109 28 TSH 16.00-32 109 29 AV5 0.00

30. 114 '32. AV2- - . 0.00 --

30' 114 34 AVS 0.00'

't Page 3 of 3 '

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