Text

Results of the Fourteenth Steam Generator Tube Inservice Inspection
	ML070860222
Person / Time
Site:	Wolf Creek
Issue date:	03/19/2007
From:	Garrett T; Wolf Creek
To:	; Document Control Desk, NRC/NRR/ADRO
References
	ET 07-0005
	Download: ML070860222 (39)
	v • d • e

WLF CREEK NUCLEAR OPERATING CORPORATION Terry J. Garrett March 19, 2007 Vice President, Engineering ET 07-0005 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555

Subject:

Docket No. 50-482:

Results of the Fourteenth Steam Generator Tube Inservice Inspection Gentlemen:

Attachment I, the Steam Generator Tube Inspection Report, is being submitted in accordance with Wolf Creek Generating Station (WCGS) Technical Specification 5.6.10.

This report provides the results of Wolf Creek Generating Station's fourteenth steam generator (SG) tube inservice inspection. The Steam Generator Tube Inspection Report includes the following:

a. The scope of inspections performed on each SG;

b. Active degradation mechanisms found;

c. Nondestructive examination techniques utilized for each degradation mechanism;

d. Location, orientation (if linear), and measured sizes (if available) of service induced indications;

e. Number of tubes plugged during the inspection outage for each active degradation mechanism;

f.

Total number and percentage of tubes plugged to date; and

g. The results of condition monitoring, including the results of tube pulls and in-situ testing.

No commitments are contained in this correspondence.

P.O. Box 411 / Burlington, KS 66839 / Phone: (620) 364-8831 An Equal Opportunity Employer M/F/HCNET

ET 07-0005 Page 2 of 2 If you have any questions concerning this matter, please contact me at (620) 364-4084, or Mr.

Kevin Moles at (620) 364-4126.

Very truly yours, Terry J. Garrett TJG/rlt Attachment cc: J. N. Donohew (NRC), w/a 7

V. G. Gaddy (NRC), w/a B. S. Mallett (NRC), wla Senior Resident Inspector (NRC), w/a

Attachment I to ET 07-0005 Page 1 of 37 STEAM GENERATOR TUBE INSPECTION REPORT This report is being submitted pursuant to Technical Specification 5.6.10 to report the results of the fourteenth steam generator (SG) tube inservice inspection.

Summary The fourteenth SG tube inservice inspection was completed by Westinghouse Electric Corporation on October 22, 2006, during Refueling Outage 15 (RF15). Initial entry into Mode 4 was achieved on November 6, 2006.

During RF15, the Wolf Creek Model F Steam Generators were in the second sequential inspection period (90 Effective Full Power Months). To date, the only SG service-induced tube degradation is wear at Anti-Vibration Bar (AVB) intersections and wear due to the presence of foreign objects. No corrosion related tube degradation mechanisms have been detected. The condition of the SGs has met all industry and regulatory structural and leakage integrity requirements.

Section 1 of this report describes the scope of inspections performed, including the nondestructive examination techniques utilized for each degradation mechanism.

Section 2 contains the location, orientation (if linear), and measured sizes (if available) of service induced indications.

Section 3 contains the inspection results, which include:

a. Active degradation mechanisms found;

b. Number of tubes plugged during the inspection outage for each active degradation mechanism;

c. Total number and percentage of tubes plugged to date; and

d. The results of condition monitoring, including the results of tube pulls and in-situ testing.

Attachment I to ET 07-0005 Page 2 of 37 STEAM GENERATOR TUBE INSPECTION REPORT Technical Specification Required Reports Section 1: Scope and Examination Techniques of Inspections Performed The actual inspection performed during RF15 exceeded both the technical specification minimum requirements and the requirements of the Electrical Power Research Institute (EPRI)

Pressurized Water Reactor (PWR) Steam Generator Examination Guidelines. The inspections were performed in SGs A and D and included:

100% bobbin examination of tubes full length except for Rows 1 to 4, which were inspected with the bobbin from tube end to tube support plate #7 on both the hot and cold leg sides (see note 1) 55% Plus Point examination of the hot leg top of tubesheet (TTS) +3", including 100% of the peripheral tubes, 2 pitches into the bundle 100% Plus Point examination of the cold leg peripheral tubes TTS +3", 2 pitches into the bundle 50% Plus Point examination of the hot leg tubesheet expansion zone bulges and overexpansions in the region from the TTS to the TTS-17".

The sample was concentrated in the range of TTS to TTS-10" Special Interest Plus Point examinations of all hot and cold leg possible flaw locations including all "I-codes" that were new or not resolved by history review Plus Point examination of all previously un-inspected and new hot leg (including the U-bend) dings and dents >5 volts Plus Point examination of a 5% sample of bobbin indications that have not changed since the prior inspection ("H" and "S" codes)

Plus Point inspection to bound (all surrounding tubes, at least one pitch removed) the tubes exhibiting possible loose part signals Acquisition of low frequency bobbin data and a sample of Plus Point data to support scale profiling analysis to provide information on the secondary side deposit accumulation Visual inspection of all plugs

Note 1: 100% of the u-bends have been inspected during the second inspection period.

The pre-outage degradation assessment documented that degradation in the first 10 rows of u-bends is not expected due to the additional stress relieving after bending of these tubes.

Attachment I to ET 07-0005 Page 3 of 37 STEAM GENERATOR TUBE INSPECTION REPORT Section 2: Indication Listing The following tables contain all tubes inspected that had a percent through wall loss indication.

This encompasses the location, orientation (if linear), and measured sizes (if available) of service induced indications The key below provides a description of the abbreviations used in the following tables.

H, #C

(# = number) of Support Plate(s) Hot Leg or Cold Leg Side AV#

Anti-Vibration Bar (# = number)

TSH Tube Sheet Hot Leg FBC Flow Baffle Cold Leg FBH Flow Baffle Hot Leg

Attachment I to ET 07-0005 Page 4 of 37 STEAM GENERATOR TUBE INSPECTION REPORT Tube Indications on Steam Generator "A" Row 25 27 30 38 40 35 40 38 39 45 45 45 45 27 45 45 45 40 48 48 44 37 38 38 45 45 45 45 50 23 41 41 44 41 41 41 45 45 45 45 45 47 47 47 47 Column 8

10 10 19 19 20 20 25 25 25 25 25 25 26 26 26 26 27 27 27 28 29 29 29 30 30 30 30 30 31 31 31 31 32 32 32 32 32 32 32 32 32 32 32 32 Indication

(% of Wall Thickness) 11 10 14 14 14 14 13 16 16 23 15 20 32 17 24 26 13 14 16 14 15 17 19 14 18 25 14 17 13 11 13 22 17 12 20 15 13 22 35 27 15 17 35 28 15 Location AV6 AV5 AV5 AV4 AV5 AV3 AV5 AV2 AV2 AV2 AV3 AV4 AV5 AV5 AV3 AV4 AV5 AV2 AV4 AV5 AV5 AV6 AV2 AV3 AV2 AV3 AV4 AV5 AV5 AV1 AV2 AV4 AV4 AV2 AV3 AV4 AV2 AV3 AV4 AV5 AV6 AV2 AV3 AV4 AV5 Inch (+/-)

From Location 0

-0.18 0

-0.05

-0.03 0

0 0

-0.08

-0.05 0.03 0.05

-0.05 0

0.03

-0.03 0

0 0

-0.08 0

0.1 0.03 0.1 0

0 0

0.11

-0.13

-0.17

-0.14

-0.11

-0.23

-0.1

-0.06 0

0 0

0

Attachment I to Page 5 of 37 ET 07-0005 STEAM GENERATOR TUBE INSPECTION REPORT Tube Indications on Steam.Generator "A" Row 34 38 45 45 45 50 48 48 48 33 33 33 35 43 45 36 36 37 38 45 45 45 45 48 30 40 43 43 43 43 45 45 45 48 39 39 39 39 44 44 44 44 44 38 38 Column 33 33 33 34 34 34 35 35 35 36 36 36 36 36 36 37 37 37 37 37 37 37 37 37 38 38 38 38 38 38 38 38 38 38 39 39 39 39 39 39 39 39 39 40 40 Indication

(% of Wall Thickness) 17 16 28 15 17 19 15 15 19 20 16 13 18 17 20 12 12 15 18 19 26 15 13 20 17 16 17 38 17 16 16 21 17 10 18 18 18 21 19 14 32 27 14 18 20 Inch (+/-)

Location From Location AV4 AV3 AV4 AV2 AV4 AV2 AV3 AV4 AV5 AV2 AV3 AV5 AV5 AV3 AV2 AV3 AV4 AV5 AV5 AV2 AV3 AV4 AV6 AV3 AV5 AV4 AV2 AV3 AV4 AV5 AV1 AV3 AV4 TSH AV3 AV4 AV5 AV6 AV2 AV3 AV4 AV5 AV6 AV2 AV3 0

0 0

0.07 0.05 0.23 0.03 0

0 0.05 0

0 0

0

-0.17

-0.23 0

0.03 0

0.31 0

-0.16 0

0.21 0

-0.06 0

0

-0.23 0

0.16

-0.08 0

0 0.03 0.08

-0.13

Attachment I to ET 07-0005 Page 6 of 37 STEAM GENERATOR TUBE INSPECTION REPORT Tube Indications on Steam Generator "A" Row 41 41 41 44 45 45 46 46 46 27 27 28 28 38 38 40 40 44 44 44 45 45 45 45 45 27 30 36 36 36 36 36 36 36 36 40 40 40 40 40 56 28 36 41 41 Column 40 40 40 40 40 40 40 40 40 41 41 41 41 41 41 41 41 41 41 41 41 41 41 41 41 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42-43 43 43 43 Indication

(% of Wall Thickness) 18 14 20 12 17 25 33 38 34 19 23 17 17 29 22 15 14

.13 28 15 18 37 30 25 21 19 16 18 16 15 21 19 17 19 22 8

16 20 15 11 10 17 23 7

14 Inch (+/-)

Location From Location AV2 AV5 AV6 AV3 AV3 AV4 AV2 AV4 AV5 AV2 AV5 AV2 AV5 AV3 AV4 AV3 AV4 AV4 AV5 AV6 AV2 AV3 AV4 AV5 AV6 AV5 AV2 AV2 AV3 AV4 AV5 AV2 AV3 AV4 AV5 AV2 AV3 AV4 AV5 AV6 AV6 AV2 AV2 AV2 AV3

-0.03 0.05 0

-0.03 0

0.03 0

0 0

Attachment I to ET 07-0005 Page 7 of 37 STEAM GENERATOR TUBE INSPECTION REPORT Tube Indications on Steam Generator "A" Row 41 41 41 57 30 35 38 41 41 41 41 43 44 44 44 44 44 28 28 35 35 36 36 36 36 36 36 37 38 39 39 40 40 41 41 43 44 44 44 44 26 28 28 28 35 Column 43 43 43 43 44 44 44 44 44 44 44 44 44 44 44 44 44 45 45 45 45 45 45 45 45 45 45 45 45 45 45 45 45 45 45 45 45 45 45 45 46 46 46 46 46 Indication

(% of Wall Thickness) 11 25 16 9

19 13 11 17 23 19 14 12 39 29 26 28 25 26 15 18 21 7

21 16 20 23 19 13 17 34 20 13 14 10 14 10 21 20 19 9

13 17 35 17 16 Inch (+/-)

Location From Location AV4 AV5 AV6 AV5 AV5 AV5 AV5 AV2 AV3 AV4 AV5 AV3 AV2 AV3 AV4 AV5 AV6 AV5 AV6 AV1 AV2 AV1 AV2 AV3 AV4 AV5 AV6 AV6 AV5 AV4 AV5 AV3 AV4 AV5 AV6 AV3 AV3 AV4 AV5 AV6 AV2 AV2 AV5 AV6 AV4 0

0 0

-0.08 0

0 0

Attachment I to ET 07-0005 Page 8 of 37 STEAM GENERATOR TUBE INSPECTION REPORT Tube Indications on Steam Generator "A" Row 38 38 38 38 39 39 39 43 43 43 43 43 44 44 44 44 49 49 49 49 50 34 34 34 36 36 37 37 37 39 39 39 40 40 40 40 40 40 42 44 36 37 37 38 38 Column 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 47 47 47 47 47 47 47 47 47 47 47 47 47 47 47 47 47 47 47 48 48 48 48 48 Indication

(% of Wall Thickness) 14 17 19 41 34 24 25 14 16 32 12 11 15 21 14 12 18 17 21 17 22 24 20 26 10 10 22 32 24 14 13 15 22 36 38 26 21 17 10 17 23 20 13 28 23 Inch (+/-)

Location From Location AV1 AV2 AV3 AV4 AV2 AV3 AV4 AV2 AV3 AV4 AV5 AV6 AV2 AV3 AV4 AV5 AV3 AV4 AV3 AV4 AV3 AV2 AV3 AV5 AV3 AV5 AV3 AV4 AV5 AV2 AV4 AV5 AVi AV2 AV3 AV4 AV5 AV6 AV5 AV2 AV5 AV2 AV3 AV2 AV3 0

0 0

0 0.07 0.28 0

0 0

0.18 0

0 0

Attachment I to ET 07-0005 Page 9 of 37 STEAM GENERATOR TUBE INSPECTION REPORT Tube Indications on Steam Generator "A" Row 38 38 40 22 36 36 36 40 40 40 40 36 36 36 36 36 38 39 27 35 49 49 49 49 49 38 38 38 40 40 40 40 40 43 33 33 34 36 40 42 42 49 49 35 36 Column 48 48 48 49 49 49 49 49 49 49 49 50 50 50 50 50 50 50 51 51 51 51 51 51 51 52 52 52 52 52 52 52 52 52 53 53 53 53 53 53 53 53 53 54 54 Indication

(% of Wall Thickness) 17 15 19 14 22 15 18 19 22 13 10 19 20 22 19 13

,18 16 13 10 38 26 28 30 15 25 20 15 24 16 21 31 18 19 20 16 19 17 11 20 26 16 12 21 26 Inch (+/-)

Location From Location AV4 AV5 AV5 AV2 AV2 AV3 AV4 AV2 AV3 AV4 AV5 AV2 AV3 AV4 AV5 AV6 AV4 AV4 AV5 AV1 AV2 AV3 AV4 AV5 AV6 AV3 AV4 AV5 AV2 AV3 AV4 AV5 AV6 AV2 AV2 AV3 AV2 AV6 AV3 AV2 AV5 AV5 AV6 AV2 AV3

Attachment I to ET 07-0005 Page 10 of 37 STEAM GENERATOR TUBE INSPECTION REPORT Tube Indications on Steam Generator "A" Row 36 40 41 42 42 18 38 38 38 42 35 44 44 44 44 19 19 31 40 40 40 40 40 41 41 43 43 43 43 39 41 41 41 44 44 44 44 40 40 40 44 44 44 34 34 Column 54 54 54 54 54 55 55 55 55 55 56 56 56 56 56 58 58 58 58 58 58 58 58 58 58 58 58 58 58 59 59 59 59 59 59 59 59 60 60 60 60 60 60 61 61 Indication

(% of Wall Thickness) 20 16 32 14 24 21 21 33 35 14 20 24 31 26 20 21 17 24 18 40 17 33 9

28 20 28 22 24 18 19 22 28 19 30 32 21 17 43 32 28 26 23 18 22 12 Inch (+/-)

Location From Location AV5 AV2 AV5 AV4 AV5 AV1 AV2 AV3 AV4 AV4 AV2 AV2 AV3 AV4 AV5 AV1 AV6 AV2 AV2 AV3 AV4 AV5 AV6 AV2 AV3 AV2 AV3 AV4 AV5 AV5 AV2 AV3 AV4 AV2 AV3 AV4 AV6 AV3 AV4 AV5 AV3 AV4 AV5 AV4 AV5

-0.09 0

0 0

0, 0

0 0

-0.13 0

0.09 0

0 0

0

Attachment I to ET 07-0005 Page 11 of 37 STEAM GENERATOR TUBE INSPECTION REPORT Tube Indications on Steam Generator "A" Row 42 36 36 37 37 37 57 51 49 49 40 40 40 40 40 50 27 50 50 37 37 37 37 37 39 40 40 40 40 40 41 41 41 41 41 42 44 44 44 44 39 44 58 34 34 Column 61 63 63 64 64 64 64 66 68 68 70 70 70 70 70 70 71 71 71 74 74 74 74 74 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 76 77 77 78 78 Indication

(% of Wall Thickness) 23 11 14 16 15 16 16 18 20 16 15 35 30 16 13 30 14 21 22 18 34 34 33 17 17 31 13 35 25 38 19 18 17 29 14 21 20 18 22 16 27 20 11 17 10 Inch (+/-)

Location From Location AV2 AV2 AV3 AV2 AV3 AV4 AV2 AV2 AV2 AV3 AV1 AV3 AV4 AV5 AV6 AV2 AV2 AV3 AV5 AV1 AV3 AV4 AV5 AV6 AV3 AV1 AV2 AV3 AV4 AV5 AV2 AV3 AV4 AV5 AV6 AV1 AV3 AV4 AV5 AV6 AV2 AV4 AV6 AV2 AV3 0

0 0

0 0.05 0

0.04 0

0 0

0

Attachment I to ET 07-0005 Page 12 of 37 STEAM GENERATOR TUBE INSPECTION REPORT Tube Indications on Steam Generator "A" Row 34 39 39 39 39 39 39 27 34 34 39 39 39 39 39 40 39 39 39 44 46 48 48 48 48 56 56 27 40 40 40 40 36 46 46 34 34 34 39 39 39 39 39 39

.53 Column 78 78 78 78 79 79 79 80 80 80 80 80 80 80 80 80 81 81 81 81 81 81 81 81 81 81 81 82 82 82 82 82 83 83 83 84 84 84 84 84 84 84 84 84 84 Indication

(% of Wall Thickness) 24 18 16 15 17 24 16 18 16 19 27 28 28 20 44 17 16 17 15 15 18 25 16 17 38 14 13 17 19 14 13 17 18 11 18 14 17 12 10 34 35 21 24 22 15 Inch (+/-)

Location From Location AV5 AV3 AV5 AV6 AV3 AV4 AV5 AV5 AV1 AV2 AV2 AV3 AV4 AV5 AV6 AV2 AV2 AV4 AV5 AV2 AV2 AV2 AV3 AV4

AV5 AV5 AV5 AV5 AV2 AV3 AV4 AV5 AVi AV1 AV2 AV2 AV3 AV4 AV1 AV2 AV3 AV4 AV5 AV6 AV5 0

0 0

0 0.18 0.07 0

0 0

Attachment I to Page 13 of 37 ET 07-0005 STEAM GENERATOR TUBE INSPECTION REPORT Tube Indications on Steam Generator "A" Row 39 39 39 39 39 54 25 31 46 46 46 30 39 39 39 39 44 44 50 50 50 50 20 30 30 44 44 44 44 44 53 50 50 35 35 36 36 36 36 41 35 36 36 44 38 Column 85 85 85 85 85 85 86 86 86 86 86 87 87 87 87 87 87 87 87 87 87 87 88 88 88 89 89 89 89 89 89 90 90 91 91 91 91 91 91 91 92 92 92 92 93 Indication

(% of Wall Thickness) 17 34 36 25 16 18 15 21 17 17 15 19 13 11 32 17 18 15 16 14 21 23 19 20 15 13 17 29 20 18 14 12 31 17 24 20 25 12 18 15 16 12 11 22 18 Inch (+/-)

Location From Location AV2 AV3 AV4 AV5 AV6 AV5 AV5 AV5 AV1 AV2 AV3 AV5 AV2 AV3 AV4 AV6 AV2 AV3 AV1 AV3 AV4 AV5 AV6 AV2 AV5 AV2 AV3 AV4 AV5 AV6 AV3 AV4 AV5 AV1 AV4 AV2 AV4 AV5 AV6 AV6 AV3 AV2 AV5 AV4 AV5

Attachment I to ET 07-0005 Page 14 of 37 STEAM GENERATOR TUBE INSPECTION REPORT Tube Indications on Steam Generator "A" Indication Inch (+1-)

Row Column

(% of Wall Thickness)

Location From Location 39 93 14 AV2 0

39 93 28 AV3 0

39 93 16 AV4 0

39 93 15 AV5 0

39 94 14 AV3 0

39 94 16 AV5 0

20 95 14 AV6 0

38 95 12 AV4 0

38 95 18 AV5 0

39 95 18 AV3 0

39 95 21 AV4 0

39 95 10 AV5 0

39 96 18 AV3 0

39 96 19 AV4 0

27 97 15 AV1 0

27 97 19 AV2 0

35 97 15 AV4 0

37 97 14 AV2 0

37 97 14 AV3 0

37 97 17 AV5 0

38 98 21 AV3 0

38 98 24 AV4 0

35 99 17 AV5 0

38 99 23 AV4 0

37 100 12 AV3 0

37 100 17 AV4 0

39 101 13 AV3 0

39 101 18 AV4 0

39 101 14 AV5 0

40 102 20 AV3 0

40 102 16 AV4 0

40 102 14 AV5 0

40 103 13 AV3 0

40 103 13 AV4 0

40 103 11 AV6 0

43 103 16 AV3 0

38 106 11 AV4 0

38 106 13 AV5 0

26 109 15 AV2 0

36 109 14 AV4 0

36 110 13 AV3 0

36 110 27 AV4 0

36 110 35 AV5 0

36 110 15 AV6 0

End of Steam Generator "A"

Attachment I to Page 15 of 37 ET 07-0005 STEAM GENERATOR TUBE INSPECTION REPORT Tube Indications on Steam Generator "D" Row 27 27 29 29 29 30 30 32 32 33 33 33 31 32 32 33, 33 33 33 31 33 33 33 34 34 32 32 32 33 33 33 35 33 35 36 33 33 36 36 36 37 37 37 37 Column 8

8 10 10 10 10 10 11 11 11 11 11 12 12 12 12 12 12 12 13 13 13 13 13 13 14 14 14 14 14 14 14 15 15 15 16 16 16 16 16 16 16 16 16 Indication

(% of Wall Thickness) 11 19 12 15 28 16 22 14 17 18 20 21 12 18 15 17 35 33 17 8

28 27 42 33 14 21 14 11 18 16 22 20 21 15 23 14 14 10 26 12 20 24 19 20 Inch (+/-)

Location From Location AV1 AV6 AV1 AV2 AV5 AV2 AV5 AV2 AV6 AV2 AV5 AV6 AV5 AV5 AV6 AV2 AV4 AV5 AV6 AV5 AV4 AV5 AV6 AV3 AV4 AV4 AV5 AV6 AV2 AV3 AV4 AV5 AV4 AV4 AV5 AV3 AV4 AV3 AV4 AV5 AV3 AV4 AV5 AV6 0

0 0

0 0.04 0

0 0

0.13 0

0 0

Attachment I to ET 07-0005 Page 16 of 37 STEAM GENERATOR TUBE INSPECTION REPORT Tube Indications on Steam Generator "D" Row 38 38 35 35 37 37 37 37 38 38 34 35 37 37 37 37 38 38 38 39 39 41 41 33 37 37 37 38 38 38 38 38 39 39 39 39 40 40 41 41 41 41 41 41 37 Column 16 16 17 17 17 17 17 17 17 17 18 18 18 18 18 18 18 18 18 18 18 18 18 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 20 Indication

(% of Wall Thickness) 15 25 24 26 15 28 20 18 12 15 17 15 11 10 14 13 14 11 12 17 21 16 17 21 14 26 15 11 26 10 16 12 31 24 22 19 16 15 15 41 30 24 30 21 14 Inch (+/-)

Location From Location AV3 AV4 AV2 AV3 AV3 AV4 AV5 AV6 AV4 AV6 AV3 AV5 AV1 AV3 AV4 AV5 AV4 AV5 AV6 AV2 AV3 AV1 AV5 AV3 AV1 AV3 AV4 AV1 AV3 AV4 AV5 AV6 AV2 AV3 AV5 AV6 AV2 AV4 AV1 AV2 AV3 AV4 AV5 AV6 AV2

Attachment I to ET 07-0005 Page 17 of 37 STEAM GENERATOR TUBE INSPECTION REPORT Tube Indications on Steam Generator "D" Row 37 37 39 39 40 40 41 41 41 41 41 31 37 37 38 38 38 39 39 40 40 40 41 41 41 38 41 41 41 41 42 42 42 35 38 38 40 40 43 43 43 43 43 39 39 Column 20 20 20 20 20 20 20 20 20 20 20 21 21 21 21 21 21 21 21 21 21 21 21 21 21 22 22 22 22 22 22 22 22 23 23 23 23 23 23 23 23 23 23 24 24 Indication

(% of Wall Thickness) 9 15 23 30 20 14 10 23 34 41 29 12 19 15 21 10 16 19 15 13 9

10 12 13 21 20 23 30 30 23 13 18 8

16 17 19 14 19 18 22 42 38 27 15 19 Inch (+/-)

Location From Location AV3 AV4 AV2 AV3 AV4 AV6 AV1 AV3 AV4 AV5 AV6 TSH AV2 AV4 AV2 AV3 AV4 AV3 AV5 AV4 AV5 AV6 AV1 AV2 AV5 AV3 AV2 AV3 AV5 AV6 AV4 AV5 AV6 AV3 AV5 AV6 AV4 AV5 AVI AV2 AV4 AV5 AV6 AV2 AV4 0

0 0

0.06 0

0 0

0.19 0

0 0

Attachment I to Page 18 of 37 ET 07-0005 STEAM GENERATOR TUBE INSPECTION REPORT Tube Indications on Steam Generator "D" Row 42 42 39 39 41 41 43 43 43 43 43 44 44 44 45 45 45 45 45 46 46 46 46 46 46 47 37.

37 37 47 47 48 41 41 41 43 43 43 43 43 44 45 47 47 49 Column 24 24 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 26 26 26 26 26 26 27 27 27 27 27 27 27 27 27 27 27 27 27 Indication

(% of Wall Thickness) 14 15 19 13 13 16 20 33 28 17 23 23 24 17 12 13 26 39 38 21 26 46 33 25 15 24 14 17 13 17 19 13 14 18 14 17 34 15 22 19 13 11 16 11 40 Inch (+/-)

Location From Location AV2 AV4 AV3 AV5 AV3 AV5 AV2 AV3 AV4 AV5 AV6 AV3 AV4 AV5 AV1 AV2 AV3 AV5 AV6 AV1 AV2 AV3 AV4 AV5 AV6 AV4 AV2 AV5 AV6 AV5 AV6 AV6 AV2 AV4 AV5 AV2 AV3 AV4 AV5 AV6 AV4 AV4 AV5 AV6 AV4

Attachment I to Page 19 of 37 ET 07-0005 STEAM GENERATOR TUBE INSPECTION REPORT Tube Indications on Steam Generator "D" Row 49 42 42 45 45 45 45 46 47 47 47 48 48 49 49 49 1

44 46 46 49 49 49 1

42 42 46 49 49 49 49 49 50 1

1 1

46 46 46 46 46 47 47 47 49 Column 27 28 28 28 28 28 28 28 28 28 28 28 28 28 28 28 29 29 29 29 29 29 29 30 30 30 30 30 30 30 30 30 30 31 31 31 31 31 31 31 31 31 31 31 31 Indication

(% of Wall Thickness) 17 17 6

19 20 31 24 19 15 28 12 19 15 19 52 50 8

19 18 14 24 27 20 8

14 18 22 37 38 22 25 29 27 8

4 5

16 24 33 39 36 18 12 31 20 Inch (+/-)

Location From Location AV5 AV2 AV3 AV2 AV3 AV5 AV6 AV5 AV3 AV5 AV6 AV5 AV6 AV4 AV5 AV6 FBC AV3 AV4 AV5 AV2 AV4 AV6 FBC AV2 AV3 AV3 AV2 AV3 AV4 AV5 AV6 AV6 FBC FBH FBH AVl AV2 AV3 AV4 AV5 AV2 AV4 AV5 AV3 0

0 0

0

-0.08 0

0 0

0 0.31 0.18 0

0 0

0 0.03

-0.23 0.27 0

0 0

Attachment I to ET 07-0005 Page 20 of 37 STEAM GENERATOR TUBE INSPECTION REPORT Tube Indications on Steam Generator "D" Row 49 49 49 50 501 1

1 32 47 47 49 49 50 50 50 50 50 1

1 1

37 37 47 47 47 47 48 48 48 52 33 35 48 48 48 48 48 37 37 45 45 45 45 53 Column 31 31 31 31 31 32 32 32 32 32 32 32 32 32 32 32 32 32 33 33 33 33 33 33 33 33 33 33 33 33 33 34 34 34 34 34 34 34 35 35 35 35 35 35 35 Indication

(% of Wall Thickness) 14 22 25 22 23 4

2 2

15 25 29 24 20 20 20 18 29 24 5

3 3

23 21 15 24 22 21 15 14 17 22 17 16 36 34

.18 28 14 20 20 20 17 17 15 27 Inch (+/-)

Location From Location AV4 AV5 AV6 AV4 AV5 FBC FBH FBH AV3 AV4 AV5 AV3 AV4 AV2 AV2 AV3 AV4 AV5 FBC FBH FBH AV2 AV3 AV3 AV4 AV5 AV6 AV2 AV3 AV4 AV6 AV5 AV3 AV2 AV3 AV4 AV5 AV6 AV4 AV5 AV2 AV3 AV4 AV5 AV3 0

0 0

-0.31

-0.3 0.3 0

0 0

0

-0.36

-0.22 0.47 0

0 0

0

Attachment I to Page 21 of 37 ET 07-0005 STEAM GENERATOR TUBE INSPECTION REPORT Tube Indications on Steam Generator "D" Row 53 54 43 39 39 39 39 41 41 49 49 49 49 51 42 42 42 43 43 43 46 46 46 49 49 44 44 45 46 46 48 48 48 48 48 48 49 52 52 52 38 38 41 41 39 Column 35 35 36 37 37 37 37 37 37 37 37 37 37 37 38 38 38 38 38 38 38 38 38 38 38 39 39 39 39 39 39 39 39 39 39 39 39 39 39 39 40 40 40 40 41 Indication

(% of Wall Thickness) 24 17 19 18 22 23 16 21 16 15 24 21 17 19 17 18 18 20 28 23 21 17 19 19 18 15 18 16 16 17 17 19 20 35 31 19 13 22 33 21 29 16 13 21 19 Inch (+/-)

Location From Location AV5 AV5 AV4 AV2 AV3 AV4 AV5 AV3 AV4 AV2 AV3 AV4 AV6 AV2 AV2 AV4 AV5 AV2 AV4 AV5 AV3 AV4 AV5 AV4 AV5 AV2 AV4 AV3 AV4 AV5 AV1 AV2 AV3 AV4 AV5 AV6 AV3 AV3 AV4 AV5 AV2 AV4 AV3 AV4 AV2 0

0 0

0.11 0

0 0

A Attachment I to Page 22 of 37 ET 07-0005 STEAM GENERATOR TUBE INSPECTION REPORT Tube Indications on Steam Generator "D" Row 39 39 39 42 42 42 42 42 51 51 51 37 41 43 45 47 47 47 39 39 39 39 39 41 41 41 41 43 45 45 45 45 42 42 43 43 33 37 37 37 37 37 46 46 51 Column 41 41 41 41 41 41 41 41 41 41 41 42 42 42 42 42 42 42 43 43 43 43 43 43 43 43 43 43 43 43 43 43 44 44 44 44 45 45 45 45 45 45 45 45 45 Indication

(% of Wall Thickness) 20 18 11 14 26 18 19 15 25 24 30 21 17 13 14 22 30 21 21 41 46 31 15 35 31 14 25 21 17 27 22 17 21 15 25 28 17 18 42 30 28 25 15 14 16 Inch (+/-)

Location From Location AV3 AV4 AV5 AV2 AV3 AV4 AV5 AV6 AV1 AV2 AV3 AV4 AV4 AV5 AV2 AV4 AV5 AV6 AV2 AV3 AV4 AV5 AV6 AV2 AV3 AV4 AV5 AV2 AV3 AV4 AV5 AV6 AV4 AV5 AV2 AV3 AV4 AV1 AV2 AV3 AV4 AV5 AV3 AV4 AV4 0

0 0

0 0.02 0

0 0

0

Attachment I to Page 23 of 37 ET 07-0005 STEAM GENERATOR TUBE INSPECTION REPORT Tube Indications on Steam Generator "D" Row 44 44 45 45 45 41 41 41 50 50 50 44 44 44 44 49 58 40 40 40 48 48 48 48 51 52 52 52 50 50 50 50 41 41 41 44 52 52 25 25 36 37 37 33 35 Column 46 46 46 46 46 47 47 47 47 47 47 48 49 49 49 49 49 50 50 50 50 50 50 50 50 50 50 50 51 51 51 51 52 52 52 52 52 52 53 53 53 53 53 54 54 Indication

(% of Wall Thickness) 19 19 17 18 22 29 18 23 15 20 15 20 13 26 17 16 22 20 24 24 16 37 34 35 11 15 18 16 31 19 16 10 16 16 19 19 28 28 16 13 19 19 20 18 17 Inch (+/-)

Location From Location AV2 AV5 AV2 AV3 AV6 AV2 AV4 AV6 AV4 AV5 AV6 AV5 AV4 AV5 AV6 AV2 AV1 AV3 AV4 AV5 AV1 AV3 AV4 AV5 AV1 AV2 AV3 AV5 AV2 AV4 AV5 AV6 AV2 AV3 AV4 AV2 AV2 AV3 AV2 AV5 AV2 AV4 AV5 AV2 AV3

Attachment I to ET 07-0005 Page 24 of 37 STEAM GENERATOR TUBE INSPECTION REPORT Tube Indications on Steam Generator "D" Row 35 35 38 38 38 45 45 45 45 45 51 51 51 39 39 39 41 41 41 45 45 45 45 45 48 34 34 44 45 45 45 45 45 45 50 50 50 50 50 50 35 50 50 50 Column 54 54 54 54 54 54 54 54 54 54 54 54 54 55 55 55 55 55 55 55 55 55 55 55 55 56 56 56 56 56 56 56 56 56 56 56 56 56 57 57 58 58 58 58 Indication

(% of Wall Thickness) 18 24 23 22 23 30 40 36 37 16 14 14 22 18 18 18 27 27 17 18 18 30 15 13 19 38 35 19 20 34 32 35 24 18 19 28 36 25 19 15 12 14 15 15 Inch (+1-)

Location From Location AV4 AV5 AV3 AV4 AV5 AV2 AV3 AV4 AV5 AV6 AV2 AV3 AV4 AV1 AV4 AV6 AV3 AV4 AV5 AV2 AV3 AV4 AV5 AV6 AV3 AV2 AV5 AV6 AV1 AV2 AV3 AV4 AV5 AV6 AV2 AV3 AV4 AV5 AV2 AV3 AV2 AV3 AV4 AV5 0

0 0

0 0.03 0

0 0

Attachment I to ET 07-0005 Page 25 of 37 STEAM GENERATOR TUBE INSPECTION REPORT Tube Indications on Steam Generator "D" Row 50 41 45 45 45 45 45 45 50 50 50 50 35 35 40 48 48 48 48 48 33 33 33 33 35 35 44 44 44 44 55 55 55 40 33 33 33 33 33 33 33 Column 58 59 59 59 59 59 59 59 59 59 59 59 60 60 60 60 60 60 60.

60 61 61 61 61 61 61 61 61 61 61 62 62 62 63 64 64 64 64 64 64 64 Indication

(% of Wall Thickness) 13 18 16 22 21 44 34 17 19 18 14 17 14 31 12 12 38 31 25 26 21 22 15 17 15 22 13 22 16 23 34 30 17 17 17 16 23 16 14 11 19 Inch (+/-)

Location From Location AV6 AV2 AV1 AV2 AV3 AV4 AV5 AV6 AV2 AV4 AV5 AV6 AV3 AV5 AV4 AV2 AV3 AV4 AV5 AV6 AV2 AV3 AV2 AV3 AV2 AV3 AV2 AV3 AV4 5H AV1 AV2 AV3 AV2 AV2 AV3 AV4 AV5 AV2 AV3 AV4 0

0 0

0 0.1 0

0 0

0

-0.53 0.18 0

0.25 0

0 0

0

Attachment I to ET 07-0005 Page 26 of 37 STEAM GENERATOR TUBE INSPECTION REPORT Tube Indications on Steam Generator "D" Row 33 41 41 41 44 15 40 31 33 33 41 41 41 41 41 44 44 44 49 34 40 46 46 31 31 31 34 34 36 52 44 44 44 44 44 46 46 50 50 57 36 Column 64 64 64 64 64 65 65 66 66 66 66 66 66 66 66 66 66 67 67 68 68 68 68 69 69 69 69 69 69 69 70 70 70 70 70 70 70 70 70 70 71 Indication

(% of Wall Thickness) 12 21 19 17 13 20 11 17 13 11 19 21 28 24 26 14 14 16 14 14 16 28 21 11 11 15 15 9

14 12 17 23 15 21 20 29 22 24 20 13 35 Inch (+/-)

Location From Location AV5 AV3 AV5 AV5 AV2 5H AV2 AV2 AV2 AV3 AV2 AV3 AV4 AV5 AV6 AV2 AV3 AV2 AV3 AV2 AV2 AV2 AV3 AVI AV2 AV5 AV2 AV3 AV3 AVI AV1 AV2 AV3 AV5 AV6 AV2 AV3 AV2 AV3 AV5 AV1 0

0

.-0.4 0.28 0

0.03 0

0 0

0.26 0

0 0

Attachment I to ET 07-0005 Page 27 of 37 STEAM GENERATOR TUBE INSPECTION REPORT Tube Indications on Steam Generator "D" Row 36 36 36 36 36 49 49 49 24 32 32 32 36 36 39 45 45 48 39 39 39 44 44 50 50 50 50 50 36 36 45 45 45 45 45 45 52 52 57 57 39 Column 71 71 71 71 71 71 71 71 72 72 72 72 73 73 74 74 74 74 75 75 75 75 75 75 75 75 75 75 76 76 76 76 76 76 76 76 76

.76 76

,76

,77 Indication

(% of Wall Thickness) 25 25 20 27 18 21 45 33 13 29 16 15 15 20 16 16 12 28 11 16 17 13 19 13 42 33 20 35 16 15 19 24 30 51 25 19 13 16 15 28 19 Inch (+/-)

Location From Location AV2 AV3 AV4 AV5 AV6 AV3 AV4 AV5 AV2 AV1 AV2 AV5 AV2 AV5 AV3 AV1 AV2 AV2 AV2 AV3 AV5 AV1 AV2 AVI AV2 AV3 AV4 AV5 AV1 AV2 AV1 AV2 AV3 AV4 AV5 AV6 AV1 AV2 AV4 AV5 AV1 0

0 0

-0.07 0

0 0.07 0

0 0

0.18 0

0 0

0.03 0

0.12

-0.02 0

Attachment I to ET 07-0005 Page 28 of 37 STEAM GENERATOR TUBE INSPECTION REPORT Tube Indications on Steam Generator "D" Row 39 39 39 39 39 44 39 41 46 50 50 50 28 28 33-39 42 36 36 39 39 50 50 56 37 37 43 43 43 43 45 45 45 45 47 49 51 51 51 24 43 Column 77 77 77 77 77 77 78 78 78 78 78 78 79 79 79 79 79 80 80 80 80 80 80 80 81 81 81 81 81 81 81 81 81 81 81 81 81 81 81 82 82 Indication

(% of Wall Thickness) 26 25 21 41 21 20 25 15 20 21 32 18 12 10 14 16 17 13 16 20 16 18 10 10 18 17 15 27 12 17 24 39 32 18 20 22 32 22 21 10 14 Inch (+/-)

Location From Location AV2 AV3 AV4 AV5 AV6 AV3 AV3 AV2 AV2 AV2 AV3 AV4 AV2 AV5 AV5 AV2 AV3 AV3 AV4 AV2 AV4 AV2 AV3 AV4 AV3 AV4 AV2 AV3 AV4 AV5 AV2 AV3 AV4 AV5 AV3 AV2 AV2 AV4 AV5 AV6 AV2 0

0 0

-0.09

-0.24

-0.17 0

Attachment I to Page 29 of 37 ET 07-0005 STEAM GENERATOR TUBE INSPECTION REPORT Tube Indications on Steam Generator "D" Row 43 45 49 39 39 40 44 48 48 20 32 32 41 41 41 41 46 46 24 35 35 46 49 49 49 50 50 50 26 40 41 28 30 36 40 40 40 40 40 47 50 Column 82 82 82 83 83 83 83 83 83 84 84 84 84 84 84 84 84 84 85 85 85 85 85 85 85 85 85 85 86 86 86 87 87 87 87 87 87 87 87 87 87 Indication

(% of Wall Thickness) 17 24 16 29 23 19 13 15 19 25 15 10 16 24

.15 17 37 21 14 11 18 17 25 19 17 22 23 16 14 14 22 13 13 16 19 18 22 33 12 14 16 Inch (+/-)

Location From Location AV4 AV3 AV2 AV3 AV4 AV3 AV2 AV2 AV4 AV6 AV3 AV6 AV1 AV3 AV4 AV5 AV3 AV4 AV6 AV3 AV4 AV4 AV2 AV4 AV5 AV4 AV5 AV6 AV5 AV3 AV4 AV2 AV2 AV1 AV1 AV2 AV3 AV4 AV5 AV1 AV4 0

0 0

-0.04 0

0

-0.02 0

0 0

-0.06

-0.19 0

0 0

0

-0.07

-0.1 0

-0.09 0

-0.12 0.07 0

0.07 0

0 0

0

Attachment I to ET 07-0005 Page 30 of 37 STEAM GENERATOR TUBE INSPECTION REPORT Tube Indications on Steam Generator "D" Row 50 20 38 38 45 45 45 49 49 53 36 38 38 38 48 48 48 50 1

1 1

36 36 36 39 39 45 53 53 53 1

1 32 49 49 49 1

1 1

19 40 Column 87 88 88.

88 88 88 88 88 88 88 89 89 89 89 89 89 89 89 90 90 90 90 90 90 90 90 90 90 90 90 91 91 91 91 91 91 92 92 92 92 92 Indication

(% of Wall Thickness) 19 19 16 17 13 19 34 18 18 10 18 24 26 18 46 14 28 20 4

4 5

19 11 18 15 13 18 24 17 19 5

5 17 35 12 22 5

4 2

12 17 Inch (+/-)

Location From Location AV5 AV1 AV2 AV3 AV3 AV4 AV5 AV3 AV4 AV2 AV3 AV3 AV4 AV5 AV3 AV4 AV5 AV3 FBC FBC FBH AV3 AV4 AV6 AV1 AV2 AV3 AV4 AV5 AV6 FBC FBH AV5 AV2 AV4 AV5 FBC FBH FBH AV6 AV1

-0.07 0

0.02

-0.07 0

0 0

-0.06 0

0

-0.09 0

0 0.08 0

0

-0.39 0.32 0.2 0

0

-0.02 0

0 0

0

-0.42

-0.25 0

0 0

-0.24

-0.37 0.02

-0.28 0

0.24

Attachment I to ET 07-0005 Page 31 of 37 STEAM GENERATOR TUBE INSPECTION REPORT Tube Indications on Steam Generator "D" Row 40 40 43 43 43 43 45 45 45 49 49 49 1

45 45 45 1

39 41 41 41 41 41 43 43 43 43 44 35 35 38 41 41 41 44 44 45 45 45 45 Column 92 92 92 92 92 92 92 92 92 92 92 92 93 93 93 93 94 94 94 94 94 94 94 94 94 94 94 94 94 95 95 95 95 95 95 95 95 95 95 95 95 Indication

(% of Wall Thickness) 20 16 8

24 9

9 8

22 17 22 19 13 6

13 20 24 2

4 11 33 30 25 20 8

29 13 16 25 17 6

7 25 19 13 21 11 24 10 10 28 35 Inch (+/-)

Location From Location AV3 AV5 AV2 AV3 AV4 AV5 AV3 AV4 AV5 AV2 AV4 AV5 FBC AV3 AV4 AV5 FBC FBH AV3 AV2 AV3 AV4 AV5 AV6 AV2 AV3 AV4 AV5 AV3 AV1 AV5 AV2 AV2 AV4 AV5 AV2 AV3 AV2 AV3 AV4 AV5

-0.02 0

0

-0.02 0

0 0

0 0.23 0

0 0

,0.23 0.27 0

0 0

0

-0.07 0

-0.02

-0.15 0

0 0

Attachment I to ET 07-0005 Page 32 of 37 STEAM GENERATOR TUBE INSPECTION REPORT Tube Indications on Steam Generator "D" Row 45 41 41 41 44 44 44 45 45 27 38 40 40 41 41 46 40 40 40 38 38 41 43 34 38 38 38 41 41 41 41 42 42 36 38 38 38 40 40 34 36 Column 95 96 96 96 96 96 96 96 96 97 97 97 97 97 97 97 98 98 98 99 99 99 99 100 100 100 100 100 100 100 100 100 100 101 101 101 101 102 102 103 103 Indication

(% of Wall Thickness) 15 14 25 13 20 32 15 19 27 15 18 19 20 25 36 23 22 25 17 23 17 14 14 9

21 20 17 26 22 23 16 10 24 14 27 24 14 36 34 11 10 Inch (+/-)

Location From Location AV6 AV2 AV3 AV5 AV2 AV3 AV4 AV2 AV5 TSH AV5 AV3 AV4 AV3 AV4 AV3 AV2 AV3 AV4 AV2 AV3 AV2 AV5 AV3 AV2 AV3 AV5 AV2 AV3 AV4 AV5 AV3 AV4 AV2 AV3 AV4 AV5 AV3 AV4 AV6 AV3 0

0 0

-0.78

-0.1 0

0 0

0.11 0.07 0

0

-0.15 0

-0.07 0

0.02 0.2 0

0 0

0.14 0.2 0.12

-0.12 0

0.23 0

0 0

0.11

Attachment I to Page 33 of 37 ET 07-0005 STEAM GENERATOR TUBE INSPECTION REPORT Tube Indications on Steam Generator "D" Row 36 38 38 38 40 40 40 40 40 34 35 38 40 40 40 40 40 35 38 38 34 34 35 35 35 35 35 35 35 35 35 35 32 33 33 33 34 34 34 34 29 Column 103 103 103 103 103 103 103 103 103 104 104 104 104 104 104 104 104 105 105 105 106 106 106 106 106 106 107 107 107 108 108 108 109 109 109 109 109 109 109 109 110 Indication

(% of Wall Thickness) 18 15 33 19 21 32 26 13 10 14 12 15 39 29 14 24.

16 11 34 24 10 10 19 16 13 14 20 18 15 28 12 16 12 17 20 23 10 7

11 9

10 Inch (+/-)

Location From Location AV4 AV3 AV4 AV5 AV2 AV3 AV4 AV5 AV6 AV3 AV5 AV3 AV2 AV3 AV4 AV5 AV6 AV6 AV3 AV4 AV4 AV6 AV2 AV3 AV4 AV6 AV3 AV4 AV5 AV4 AV5 AV6 AV5 AV3 AV4 AV5 AV2 AV4 AV5 AV6 AV5 0.09 0

0.15 0

0.14 0

0 0

0

-0.11 0

0 0.12 0

0 0

0

-0.06 0.11

-0.04 0

0 0

0

-0.1 0

0 0

0

-0.16 0

-0.1

-0.09

Attachment I to ET 07-0005 Page 34 of 37 STEAM GENERATOR TUBE INSPECTION REPORT Tube Indications on Steam Generator "D" Indication Inch (+1-)

Row Column

(% of Wall Thickness)

Location From Location 32 110 14 AV5 0.03 35 110 14 AV3 0

35 110 28 AV4 0

35 110 14 AV6 0

30 111 16 AV2 0

30 ill 18 AV6 0

27 113 16 AV2 0.26 30 113 20 AV5

-0.26 30 114 40 AV5 0.23 24 115 17 AVM 0

26 115 17 AVI 0

27 115 13 AV6

-0.19 21 117 14 TSH

-0.15 21 118 8

AVM 0

End of Steam Generator "D"

77 Attachment I to ET 07-0005 Page 35 of 37 STEAM GENERATOR TUBE INSPECTION REPORT Section 3: Inspection Results' Active Degradation Mechanisms Found The inspection results indicate that AVB wear meets the EPRI PWR Steam Generator Examination Guidelines definition of an Active Damage Mechanism for both Steam Generators A and D.

Identification of Tubes Plugged A. Steam Generator "A":

Row Column Attribution 38 46 AVB Wear 40 58 AVB Wear 40 60 AVB Wear 39 80 AVB Wear 15 60 Administrative 13 68 Administrative B. Steam Generator "D":

Row Column Attribution 49 28 AVB Wear 45 76 AVB Wear 46 25 AVB Wear 39 43 AVB Wear 48 89 AVB Wear 49 71 AVB Wear 45 59 AVB Wear 33 13 AVB Wear 43 23 AVB Wear 37 45 AVB Wear 50 75 AVB Wear 41 19 AVB Wear 41 20 AVB Wear 39 77 AVB Wear 49 27 AVB Wear 45 54 AVB Wear 30 114 AVB Wear

Attachment I to ET 07-0005 Page 36 of 37 STEAM GENERATOR TUBE INSPECTION REPORT Total number of Tubes Plugged in Each Steam Generator Steam Generator Total Number of Total Percentage Tubes Plugged Plugged A

35 0.62%

B 35 0.62%

C 20 0.36%

D 114 2.03%

An additional 3 plugs are installed in Steam Generator "A" cold leg only, due to tube sheet drilling errors during manufacturing. No tubes are installed in those locations.

Results of Condition Monitorinq The examination results confirm that the Wolf Creek steam generators currently meet all industry and regulatory structural and leakage integrity guidance. No indications were found to exceed structural limits. No tube pulls or in-situ testing were required.

AVB wear is an active degradation mechanism in both SGs A and D.

The maximum observed indication (52% through wall depth, AVB wear) meets the structural requirements.

Wear (volumetric indications) detected at the top of the tubesheet has not changed since the prior inspection during RF13 (note 1). The likely source of these indications is wear due to a transient foreign object at a prior time. No new wear indications from foreign objects were detected.

No foreign objects were found among the tubes with volumetric indications and their neighboring tubes. These indications meet the condition monitoring structural requirements.

" Wear at the flow distribution baffle (FOB) is not increasing (note 1).

FDB wear is attributed to a prior application of pressure pulse cleaning of the steam generators. No new indications were reported.

These indications meet the condition monitoring structural requirements.

Wear detected at two tube support plate intersections was attributed to a prior transient foreign object and has not changed since the prior inspection at RF13 (note 1). These indications meet the condition monitoring structural requirements.

No corrosion related degradation mechanisms were observed.

No degradation indications were observed related to potential precursor signals such as dents and dings, or interferences such as permeability variations.

No precursor signals were found in tubes identified as potentially having an elevated residual stress condition.

No tube-to-tube contact wear was found on any tubes adjacent to tubes that were previously plugged due to AVB wear.

Therefore, in accordance with evaluations documented in the Degradation Assessment, stabilization of any previously plugged tubes was not required.

Two tubes were administratively plugged due to geometric anomalies. During the top of tubesheet inspection, the signals in two tubes were found to be distorted. The source of the distortion was determined to be an inner diameter ridge or scratch extending from within the tubesheet to a few inches above the tubesheet. The ridge in both tubes could be observed as far back as 1994, the first plus point inspection of these tubes. The ridge signals in combination with the transition signal produced a geometry type response.

Neither of the signals was analyzed to be an indication of degradation.

These tubes were conservatively plugged due to the signal complexity and location.

Attachment I to ET 07-0005 Page 37 of 37 STEAM GENERATOR TUBE INSPECTION REPORT Leakage is not an issue for any indications detected. There is currently no leakage in the Steam Generators.

Foreign object search and retrieval (FOSAR) activities identified and removed some minor foreign objects from Steam Generators A and D. No potentially damaging foreign objects were observed. Possible loose part (PLP) indications reported by eddy current were further evaluated by visual inspection and bounded using the plus point probe. No degradation was associated with any PLP indication.

All plugs were found to be in acceptable condition.

Note 1: Small sizing variations were noted but these are within the variability of the sizing technique.

ET 07-0005, Results of the Fourteenth Steam Generator Tube Inservice Inspection

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ET 07-0005, Results of the Fourteenth Steam Generator Tube Inservice Inspection

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