ML20205D479

Forwards Rept Submitting Results of SG Tube ISI Conducted in Apr 1998.Rept Includes Description of Number & Extent of Tubes Inspected,Location & Percent wall-thickness Penetration for Each Indication of Imperfection

ML20205D479
Person / Time
Site:	Davis Besse
Issue date:	03/26/1999
From:	Campbell G ENTERGY OPERATIONS, INC.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
2591, NUDOCS 9904020217
Download: ML20205D479 (16)

Text

- .-

EN 0 Nort la R 2 m Oak Harbor. ohio 43449-9760 Quy G. campbell 419 321 Vice President- Nuclear Far 419-3214337 Docket Number 50-346 >

License Number NPF-3 Serial Number 2591 March 26, 1999 United States Nuclear Regulatory Commission Document Control Desk Washington, D.C. 20555-0001

Subject:

Report of Steam Generator Tube Inservice inspection Results Ladies and Gentlemon:

The enclosed report is submitted in accordance with the Davis-Besse Nuclear Power Station, Unit 9 umber 1, Operating License, Appendix A-Technical Specifications. Technical Specification Surveillance Requirement 4.4.5.5.b and Administrative Control 6.9.1.5.b reqstre the FirstEnergy Nuclear Operating Company to submit the results of the Steam Generator (SG) tube inservice inspection tc the NRC. Tubes in both of the Once-Through Steam Generators (OTSGs) at the Davis-Besse Nuclear Power Station were inspected in April, 1998, during the Eleventh Refueling Outage (April 10 - May 23,1998). The ,

enclosed report provides the results from this inspection, including a description of the number and extent of tubes inspected, the location and percent wall-  ;

thickness penetration for each indication of an imperfection, and the l Identification of the number and location of tubes plugged, sleeved or repair I rolled, j

The OTSG eddy current examinations were performed with probes utilizing a l Bobbin Coil, a Rotating Plus Point Coil and a Rotating Pancake Coil. The Bot, bin Coil Probe technique was used to perform the standard American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code Section XI examination for flaw detection. This technique was applied to the complete length of allinservice tubes.

/

The Rotating Plus Point and Pancake Coil Probe techniques were used to examine specific areas of interest. These areas included the OTSGs' upper tube end roll expansion regions, tubes bordering the lane and wedge region, non-stress relieved roll transitions, and dent / ding locations. The Rotating Plus Point g3]

and Pancake Coil Probe were also used to characterize all indications reported 9904020217 990326 i PDR ADOCK 05000346 C P PDR j 1

L

t

(

Docket Numb:r 50-346 License Number NPF-3 Serial Number 2591 Pag,e 2 by the Bobbin Coil Probe technique, and the Rotating. Pancake Coil technique was used to provide final depth sizing of Tube Support Plate wear indications.

Rotating Plus Point Coil and Bobbin Coil Probe techniques were used tc i examine the sleeves installed over OTSG tubes during previous outages. The Rotating Plus Point Coil technique was also applied to the rolled regions and -

i lower sleeve end of the tubes, while the Bobbin Coil Probe technique was used

, to examine the unrolled portion. The Rotating Pancake Coil Probe technique was used to examine tube plugs.

1 As a resu!* d this inservice inspection, eighteen tubes were plugged and three i

~'

tubes were repair rolled in SG 1-1. In SG 12, thirty-three tubes were plugged and one tube was repair rolled. No tubes were sleeved. In addition to the

inservice inspection, a portion of a tube was removed from one OTSG for further

analysis to characterize tube degradation mechanisms.  ;

j Should you have any questions or require additional information, please contact

Mr. James L. Freels, Manager - Regulatory Affairs, at (419) 321-8466.

p Very truly yours, i

ffW KAS/laj

. 1 1 enclosure cc: S. J. Campbell, NRC Region ill, DB-1 Senior Resident inspector ,

9 3 J. E. Dyer, Regional Administrator, NRC Region ill

! A. G. Hansen, DB-1 NRC/NRR Project Manager j Utility Radiological Safety Board l

b

Docket Number 50-346 License Number NPF-3

. Serial Number 2591 Enclosure i

Davis-Besse Nuclear Power Station Eleventh Refueling Outage (11RFO)

Steam Generator Inservice inspection Report

Docket Number 50-346 License Number NPF-3 Serial Number 2591 Enclosure Pag'e 1 Number and Extent of Tubes inspected:

Steam Generator 1-1 i Fifteen thousand, three-hundred, ninety-one (15,391) tubes in Steam Generator i

1-1 were examined fulllength. This represents 100% of the tubes available for examination. Tubes with percent through wall (%TW) indications are listed in the  !

table below. All of these are wear type indications which were sized with a  !

qualified technique. All other tubes with imperfections were either repaired or  !

plugged and are listed in that section of this report.

l Two-hundred, twelve (212) sleeved tubes were examined with a sleeve Bobbin Coil Probe (100% of installed sleeves) and fifty-six (56) sleeved tubes were examined with a Rotating Plus Point Probe. No indications of through wall degradation were found.

Three-thousand, sixty-eight (3,068) Upper Roll Transitions were examined with a Rotating Plus Point Probe (20% sample). Upper Roll Transitions with indications  :

are listed in the repair section of this report.

l Nine (9) plugs were examined with a Rotating Pancake Coil Probe (20% of l Installed Plugs in the Upper Tube Sheet). No indications of through wall degradation were found.

Four-hundred, seventeen (417) tubes were examined to determine their proximity to the intemal auxiliary feedwater header. All tubes were determined to have a acceptable gap of greater than 0.250 inches.

Steam Generator 1-2 l 1

Fifteen-thousand, seventy-six (15,076) tubes in Steam Generator 1-2 were examined fulllength. This represents 100% of the tubes available for examination. Tubes with percent through wall (%TW) indications are listed in the  ;

table below. All of these are wear type indications which were sized with a i qualified technique. All other tubes with imperfections were either repaired or plugged and are listed in that section of this report.

One-hundred, ninety-nine (199) sleoved tubes were examined with a sleeve Bobbin Coil (100% of installed sleeves) and forty (40) sleeved tubes were examined with a Rotating Plus Point Probe. No indications of through wall degradation were found.

Two- thousand, nine-hundred, eighty-one (2,981) Upper Roll Transitions were examined with the Rotating Plus Point Probe (20% sample). Upper Roll Transitions with indications are listed in the repair section of this report.

Docka.t Numb r 50-346 License Number NPF-3 Serial Number 2591 Enclosure Page 2 Sixty (60) plugs were examined with the Rotating Pancake Coil Probe (20% of Installed Plugs in the Upper Tube Sheet). No indications of through wall ,

degradation were found.

Three-hundred, ninety-five (395) tubes were examined to determine their proximity to the intemal auxiliary feedwater header. All tubes were determined to have an acceptable gap of greater than 0.250 inches.

Location and Percent of Wall Thickness Penetration for Each Imperfection:

STEAM GENERATOR 1-1 ROW TUBE REFERENCE DISTANCE' %TW LOCATION FROM REFERENCE 2 2 14S -0.70 .20 2 4 14S -0.67 7 4 16 10S +0.60 10 4 39 12S -0.71 8 6 39 9S +0.53 11 6 50 13S +0.44 17 i 7 35 11S -0.70 6 9 60 9S +0.13 14 10 24 9S -0.75 10 10 40 14S +0.64 12 10 65 13S +0.59 12 11 48 8S +0.64 15 11 58 6S +0.66 9 13 2 12S +0.62 23 14 73 11S +0.18 12 14 74 11S -0.64 13 14 74 11S +0.55 15 14 74 12S -0.26 17 15 67 9S +0.62 8 15 78 14S -0.69 11 17 77 6S +0.55 11 17 79 9S -0.51 20 17 81 10S +0.72 12 18 4 9S +0.60 17 18 47 11S -0.83 10 20 79 9S +0.70 20 22 5 9S +0.62 15

Dock t Numb:r 50-346 License Number NPF-3 Serial Number 2591 Enclosure Pag'e 3 22 88 9S +0.60 12 25 97 10S +0.66 16 26 14 12S -0.75 10 27 96 9S +0.49 6 27 97 9S +0.66 23 28 96 9S +0.60 15 28 99 9S +0.75 15 28 100 10S -0.53 10 28 100 10S +0.49 14 29 102 10S +0.54 17 30 104 10S -0.74 13 40 52 6S +0.08 16 41 112 9S +0.68 14 41 114 SS -0.78 7 42 112 9S -0.58 17 46 114 8S +0.60 14 48 114 7S +0.18 7 53 126 12S -0.73 8 54 116 3S +0.73 10 57 2 SS -0.76 10 57 13 8S -0.74 12 60 113 3S -0.75 9 60 128 10S +0.54 10 .

61 121 9S +0.60 15 61 125 10S +0.48 14 ,

63 126 9S +0.74 11 63 126 9S -0.66 24 64 27 4S -0.75 15 67 1 12S +0.50 26 68 3 15S -0.73 10 69 2 12S -0.20/+0.66 14 '

70 2 12S +0.41 12 70 6 12S +0.65 4 ,

70 37 6S +0.43 13 71 2 13S -0.64 17 72 2 12S +0.09 19 72 62 6S -0.05 - 11 77 68 3S -0.17 18 78 67 3S +0.48 16 89 54 6S +0.37 11 92 1 14S l +0.65 20

Dock:t Number 50-346 -

License Number NPF-3 Sarial Number 2591 Enclosure Pag'e 4 94 1 8S -0.58 19 96 124 SS +0.20 16 99 94 6S -0.65 10 101 124 12S -0.63 8 103 113 7S +0.49 12 109 F9 6S~ +0.42 12 112 71 3S -0.78 5 113 9 8S +0.65 16 114 4 9S +0.58 17 115 113 10S -0.80 13 115 114 7S -0.65 12 116 111 10S -0.67 11 117 1 9S +0.50 15 117 104 5S +0.66 7 121 41 4S +0.58 15 121 90 7S +0.62 8 121 105 10S -0.71 9 121 105 10S +0.71 9 122 104 10S -0.71 21 123 102 10S -0.69 11 124 100 ids -0.65 9  !

126 98 10S -0.76 8 1 127 49 93 -0.82 19 128 94 10S -0.82 11 l 129 93 10S -0.65 13 l 129 94 11S -0.75 11 132 6 10S +0.74 17 l 134 50 10S +0.73 10 134 81 6S +0.55, 9  ;

134 84 12S +0.45 5 i 135 79 6S +0.57 15 138 75 10S -0.67 8 140 2 12S -0.71 10 140 60 SS +0.53 17 141 1 12S -0.75 10 _

141 47 14S +0.34 8 141 68 14S +0.36 6 141 68 14S -0.42 7 142 37 7S +0.02 8 147 33 10S +0.70 13 148 22 9S -0.57 14

l Dock:t Numb:r 50-346 License Number NPF-3 i l

Serial Number 2591 Enclosure Pag'e 5 l

148' 39 12S +0.69 6 l 148 41 11S +0.50 3 l 149 19 98 0.76 11 l 149 26 11S -0.48 6 ,

149 28 11S -0.35 10 l 150 24 12S +0.55 - 12 l 150 24 12S -0.66 - 14 151 5 12S +0.49 12 )

151 9 14S +0.47 13 151 14 10S +0.73 9 i 151 14 11S -0.70 12 151 15 12S -0.68 10 151 I 15 12S +0.66 11 151 16 14S -0.73 10 l

' + is distance above the reference point and -is the distance below the l reference point.  !

S = Support l

I 1

l Dock:t Numb:r 50-346 License Number NPF-3 Serial Number 2591 l Enclosure

~

t Page 6 l I

)

STEAM GENERATOR 1-2 ,

i ROW TUBE REFERENCE DISTANCE' %TW LOCATION FROM REFERENCE 1 2 11S -0.50 9 3 3 14S -0.71 19 3 11 8S -0.31 8 4 33 9S +0.50 18 5 20 8S +0.63 11 7 16 7S +0.71 8 12 1 13S -0.76 32 12 2 13S -0.75 22 13 2 13S -0.71 21 4

15 7 13S -0.69 11 16 2 13S -0.70 25 16 13 9S -0.77 7 21 10 3S -0.76 17 24 46 7S -0.52 14 i 24 46 6S -0.46 17 30 1 14S -0.53 12

. 34 6 6S +0.77 8 i 34 84 3S -0.74 8 35 1 11S -0.71 15 35 1 13S -0.49 18 36 1 135 -0.69 19 36 1 12S +0.72 21 36 2 13S -0.69 18 37 2 13S -0.61 10 37 56 6S +0.60 4 37 75 6S +0.25 13 39 116 13S +0.00 22 40 36 7S -0.65 - 15 l 42 1 13S -0.74 16 42 67 6S -0.20 11 l 43 1 13S -0.66 26 __

51 54 6S +0.32 9

Dock:t Number 50 346 ,

License Number NPF-3 Serial Number 2591 l Enclosure '

Page 7 52 1 12S +0.58 18 52 1 13S -0.65 20 l 52 125 13S -0.71 16 54 1 11S -0.75 9 54 1 7S +0.61 9  !

54 50 6S +0.49 10 1 58 1 12S +0.40 14 l 58 1 11S -0.77 16 l 63 1 14S +0.55 8 63 128 11S -0.19

{

5 1 65 8 3S -0.59 17 68 1 14S +0.57 11 70 1 14S +0.63 13 71 2 14S -0.67 7 71 4 11S +0.53 9 71 32 7S -0.49 9 71 66 3S +0.38 9 72 1 14S +0.58 14 72 66 3S +0.53 7 73 2 6S +0.71 7 73 2 14S +0.57 12 73 27 10S +0.14 13 73 46 3S -0.51 11 73 76 SS -0.31 15 74 1 14S +0.60 15 75 34 .

4S +0.69 6 77 48 3S +0.51 13 78 1*

7S -0.75 10 78 6, 4S +0.50 6 78 .o 4S -0.70 14 78 67 15S -0.65 11 79 25 11S -0.42 10 80 61 7S -0.01 12 80 61 4S -0.64 14 80 61 7S +0.15 15 81 61 11S -0.77 13 81, 61 7S +0.62 15 82 1 6S -0.63 17 82 44 SS +0.68 10 84 32 9S +0.69 17 85 63 6S +0.19 8

Dock' t Numb r 50-346 License Number NPF-3 Serial Number 2591 Enclosure Page 8 85 122 9S -0.19 5 86 127 13S +0.67 13 86 127 14S -0.71 14 89 124 8S -0.54 12 89 124 8S +0.61 15 90 7 8S -0.79 9 92 129 7S -0.81 9 99 92 6S +0.00 16 102 4 8S -0.74 13 110 81 7S -0.20 2 110 117 13S -0.68 9 116 22 14S -0.44 9 116 110 9S +0.65 10 117 21 15S +0.87 15 118 104 9S +0.73 10 119 107 9S +0.74 6 120 102 9S +0.74 10 120 104 10S +0.64 13 121 103 9S +0.66 5 122 101 4S -0.75 10 122 104 10S -0.74 6 123 102 10S -0.62 11 124 100 10S -0.59 9 128 5 10S +0.58 20 l 128 6 10S +0.51 18 l 128 7 10S +0.58 22 129 8 10S +0.61 19 i 130 7 10S +0.69 19  !

130 8 10S +0.66 25 i 132 1 9S +0.10 18 133 3 10S -0.76 27 133 7 10S +0.80 12 137 6 10S +0.54 8 137 6 10S -0.71 12 137 6 10S -0.72 15 137 6 108 -0.52 16  ;

139 14 4S -0.80 23 140 1 10S -0.81 12 j 145 11 4S -0.82 14 146 31 10S +0.72 16 146 34 10S +0.69 14

Dock t Number 50-346 License Number NPF-3 Serial Number 2591 Enclosure Pag'e 9 146- 37 10S +0.75 16 147 30 10S +0.63 5 147 34 10S +0.76 - 17 147 36 10S +0.66 20 148 3- 10S +0.77 18 148 _

27 10S -0.74 13 148 30 10S -0.68 ~ 11

, 148 32- 10S +0.63 5 149 26 10S +0.61 10 149 27 10S +0.65 3 150 20 10S +0.69 11

. '150 21 10S +0.64 11 150 25 10S -0.73 4 150 25 10S +0.70 11 150 27 10S -0.75 21 151 1 10S +0.40 15 151 5 6S -0.71 16 151 13 10S +0.78 12 151 15 10S +0.66 2 151 15 10S -0.77 3 151 15 13S -0.72 14

' + is distance above the reference point and - is the distance below the reference point.

4 e

W d

f s

Dock:t Numb:r 50-346

. License Number NPF-3 .

Serial Number 2591 Enclosure Page 10 J

L 4

6 Tubes Plugged, Sleeved or Repair Rolled:

s Steam Generator 1-1 Tubes which were plugged in Steam Generator 1-1 are listed below. A total of eighteen (18) tubes were plugged in this steam generator. The Eddy Current t Indications were Single Volumetric Indications (SVI). Three (3) tubes were  !

Repair Rolled due to indications and are listed below. No additional tubes were i

sleeved in this steam generator. '

3 Steam Generator 1-2 1

! ~

\

Tubes which were plugged in Steam Generator 1-2 are listed below. A total of thirty-three (33) tubes were plugged in this steam generator. Included in this listing is Tube 79-68 which was a previously plugged tube that was pulled this outage for additional evaluations. This tube cavity was then plugged. The ,

majority of the Eddy Current Indications were Single Volumetric Indications  !

(SVI). One (1) tube was Repair Rolled due to an indication and is listed below, j No additional tubes were sleeved in this steam generator. I Tubes Plugged in 11RFO:

j STEAM GENERATOR 1-1 '

ROW TUBE REFERENCE DISTANCE' >

2

LOCATION FROM INDICATION

REFERENCE TYPE  ;

7 5 UTS +12.67 SVI l 8 5 UTS +7.81 SVI l 9 61 14S +32.92 SVI 9 62 14S +31.82 SVI 11 67 14S +30.73 SVI 15- 78 14S +31.04 SVI 16 79 14S +31.86 SVI 4 16 80 14S +32.16 SVI i 16 81 14S +31.82 SVI 4

e

Dock;t Number 50-346 License Number NPF-3 Serial Number 2591 Enclosure Pacje 11 18 85 14S +32.40 SVI 57 128 15S +33.02 SVI 61 20 3S- +33.64 SVI 82 52 UTS +2.96 SVI 97 109 UTS +8.53 SVI 99 52 LTS +19.80 SVI 101 56 15S +44.44 SVI i 128 78 UTS +4.62 SV1 151 15 158 -3.93 SVI I

' + is distance above the reference point and -is the distance beiow the reference point.

SVI = Single Volumetric Indication UTS = Upper Tube Sheet LTS = Lower Tube Sheet STEAM GENERATOR 1-2 ROW TUBE REFERENCE DISTANCE' LOCATION FROM INDICATION

• REFERENCE TYPE  !

3 1 14S +33.19 SVI 6 1 14S +31.29 SVI 6 2 14S +31.72 SVI 20 38 SS +12.08 SVI 21 11 SS +10.71 SVI 24 _ 20 SS +16.66 SVI 27 56 SS -0.98 SVI 33 17 14S +6.49 SVI 58 10 SS +16.08 SVI 65 62 15S +29.82 SVI 66 62 15S +28.79 SVI 78 33 9s +6.70 SVI 79 68 3S - 07S SVl/TB PULL 82 8 UTS +6.1 SVI 82 19 UTS +7.61 SVI 91 126 15S +33.01 SVI 95 25 SS +9.20 SVI 101 23 SS +10.56 SVI 103 23 SS +8.77 SVI 103 124 15S +19.62 SVI

. - ~ __ - - . -. - .. . _ -

Dock:t Number 50-346 License Number NPF

• Serial Number 2591 Enclosure-Page 12 104 22 SS +11.65 SV1 104 123 15S +17.35 SVI 112 1 15S +13.85 SVI 112 117 15S +19.73 SVI 113 104 LTS -0.40 SVI 114 13 SS +0.33 SVI 114 115 15S +19.80 SVI 115 114 15S +19.64 SVI 116 93 14S +3.04 SVI 120 25 11S +4.95 SVI 127 - 98 15S -1.30 SVI 141 53 SS +14.12 SVI 143 61 15S -2.00 SAI

' + is distance above the reference point and -is the distance below the reference point.

2 SV1 = Single Volumetric Indication, sal = Single Axial Indication Tubes Repair Rolled in 11RFO

STEAM GENERATOR 1-1 I ROW TUBE REFERENCE DISTANCE' l 2

LOCATION FROM INDICATION REFERENCE TYPE  !

11 57 UTE -0.53 MAI l 93 23 UTE -0.31 SEA 106 4 UTE -0.39 SEA i

1 + is distance above the reference point and - is the distance below the reference point.

SEA = Single Tube End Anomaly Indication, MAI = Multiple Axial Indication i UTE = Upper Tube End {

l I

l

. . - - . ~ _ - - . . . . -- - ~ . . . . - . . _ . - . . . -

Dock:t Number 50-346 License Number NPF-3 Serial Number 2591 Enclosure

, Pabe 13 3 STEAM GENERATOR 1-2 ROW TUBE REFERENCE DISTANCE' LOCATION FROM INDICATION

• REFERENCE TYPE 90 2 UTE -0.22 SEA l~ ' + is distance above the reference point and - is the distance below the

reference point.

2 1 SEA = Single Tube End Anomaly Indication i

I f

i 1

f i