ML20087G398
| ML20087G398 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 03/28/1995 |
| From: | Stetz J CENTERIOR ENERGY |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| 2284, NUDOCS 9504040206 | |
| Download: ML20087G398 (10) | |
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300 Modeson Avenue V
f. Nuclear Davis-Besse Docket Number 50-346 License Number NPF-3 Serial Number 2284 liarch 28, 1995 United State.s Nuclear Regulatory Commission Document Control' Desk Vashington, D. C.
20555
Subject:
Technical Specifications 4.4.5.5.b and 6.9.1.5.b:
Report of Steam Generator Tube Inservice Inspection Results Ladies and Gentlemen:
This letter is submitted in accordance with the Davis-Besse Nuclear Power.
Station, Unit Number 1, Operating License, Appendix A Technical Specifica-tions. Technical Specification (TS) Surveillance Requirement 4.4.5.5.b and TS 6.9.1.5.b require Toledo Edison to submit the complete results of the Steam Generator (SG) tube inservice inspection.
During the Ninth Refueling Outage (October 1 - November 13, 1994) at the Davis-Besse Nuclear Power Station (DBNPS) the tubing in the SGs was exam-ined using eddy current testing. The examinations were conducted by B&V Nuclear Technologies to meet the requirements of the Second Ten Year Inservice Inspection Plan and the DBNPS TS.
A description of the number and extent of tubes inspected, location, and percent of vall-thickness penetration for each indication of an imperfection; and identification of tube plugged or sleeved is provided in the attachments to this letter.
The eddy current examinations were performed utilizing a Bobbin Coil, a Motorized Rotating Pancake Coil (MRPC), a Crosswound/ Bobbin Coil, and a Rotating Crosswound Probe. The Bobbin Coil was used to perform the stan-dard ASME Code examination for defect detection and sizing, the auxiliary feedvater header gap measurement, and profilometry of sleeve candidate tubes prior to sleeving. The HRPC technique was used to characterize indications reported by the Bobbin Coil technique by confirming the presence of the indication, clarifying the geometry of the indication, and when possible, assisting in the determination of flaw type.
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Licensa Nurb2r NPF-3 Serial Number 2284 Page 2 The Crosswound/ Bobbin coil was used to perform flav detection in tube sleeves and in the parent tubing adjacent to the lover tube sleeve end.
This technique was also used to pativrr profilometry of the sleeves rolled joints and to verify proper Sositioning of tie sleeves af ter installation.
The Rotating Crossvound Prole was used to perform flav detection in the sleeve and parent tube in the area of the rolled joints.
Steam Generator 1-1(B)
Approximately 14.3% percent of the tubes in Steam Generator 1-1(B) were ex-amined using the Bobbin Coil. All tubes were examined full length with the exception of one (1) tube which did not require a full length examination.
Twenty (20) tubes had indications of 1% or greater through vall (Attachment 1).
As listed in Attachment 2, one (1) additional tube had a 98% through-vall indication and was plugged. One (1) other tube had a 37% through-vall indication. This one (1) tube was plugged as a preventive measure.
One hundred and seventy-two (172) tubes were examined to determine their proximity to the internal auxiliary feedvater header.
One (1) tube was determined to have a gap greater than the minimum 0.125 inches, but less than 0.250 inches.
All other tubes were determined to have a gap greater than 0.250 inches.
No tube sleeving on Steam Generator 1-1(B) was performed this outage.
Steam Generator 1-2(A)
Approximately 14.3% percent of the tubes in Steam Generator 1-2(A) vere examined using the Bobbin Coil.
All tubes were examined full length with the exception of three (3) tubes. Two (2) tubes were restricted by the data acquisition system's positioning pins and one (1) tube did not require a full length examination. The loss of examination coverage was limited to only a few inches near the tube end.
Thirty-five (35) tubes had indications of 1% or greater through wall (Attachment 3).
None of these indications exceeded 40% through wall.
However, one (1) tube was found with a ding indication and plugged as a preventive measure (Attachment 4).
One hundred and sixty-seven (167) tubes were examined to determine their proximity to the internal auxiliary feedvater header.
All tubes were determined to have a gap greater than 0.250 inches.
One hundred and ninety-nine (199) tubes, which were sleeved this outage, vere examined and no indications in the installed tube sleeves were noted (Attachment 5).
Detailed examination results are contained in the 9th Refueling Outage Steam Generator Eddy Current Inspection Report which is available for review onsite.
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JW fLicen53 Nu ber NPF-3 iSerial' Number 2284 Page.3 c-
-Should you have any questions or require additional _information,-please
- contact Mr. Villiam T. O'Connor, Manager -: Regulatory Affairs,' at '
(419) 249-2366.
L ery'truly yours, V
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cc L. L. Gundrum, DB-1 NRC/NRR Project Manager J. B.' Martin, Regional Administrator, NRC Region III S..Stasek,'DB-1 NRC Senior ~ Resident Inspector Utility Radiological Safety Board I
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The legend for the' abbreviations used in the Attachments.1 through 5 is as follows:
CHN-Channel DEG Degrees DNG
-Ding IND Indication i
LTS Lover Tube Sheet
'%TV Percent Through Vall P
Primary Mix
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Tube Support Plate Number ODI Outside Diameter Indication VAR Vear Indication i
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ATTACEMENT 1 i
STEAN GENERATOR 1-1 B LISTING OF INDICATIONS LEFT INSERVICE ROW TUBE IND
%TW VOLTS CBN DEG LOCATION 1
9 62 ODI 3-1.58 1~
139 14S +31.79 11 67 ODI 3
0.77 1
139 14S +31.21 23 6
ODI 21 0.41-1 131 07S + 7.29 29 30 ODI 12 1.46 4
123 11S +14.88 40 71 ODI 4
0.44 1
140 14S +17.40 53 126 ODI 28 0.49 P1 119 12S - 0.95 59 122 ODI 14 0,33 P1 125 09S + 0.56 61 121 ODI 12 0.43 P1 126 09S + 0.49 64 27 ODI 23 0.66 P1 122 04S - 0.81 74 66 ODI 19 0.55 1
133 OSS +30.70 78 69 ODI 1
0.82 1
145 12S +29.95 80 6
ODI 10 0.31 P1 137 09S + 0.46 96 20 ODI 13 0.46 1
136 09S +21.84 111 64 ODI 20 0.77 1
131 14S + 2.34 126 98 WAR 9
0.69 P1 0
10S - 0.72 129 94 ODI 19 0.56 1
138 14S +30.72 133 86 ODI 7
0.55 1
138 14S +31.37 ODI 15 0.23 1
141 14S +30.57 140 21 ODI 19 0.45 1
136 09S +35.19 ODI 20 0.36 1
136 09S +36.05 150 6
ODI 10 0.55 1
137 04S +12.51 151 15 ODI 14 0.42 1
143 14S +31.20 t
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ATTACEMENT 2 STEAN GENERATOR 1-1 B I
LISTING of TUBES PLUGGED ROW TUBE IND
%TW VOLTS CHN DEG LOCATION 39 45 ODI 98 0.35 1
43 01S +12.13 135 19 ODI 37 0.21 1
122 LTS +21.13 l
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ATTACEMENT 3 STEAM GENERATOR 1-2 A LISTING of INDICATIONS LEFT IN8ERVICE ROW TUBE IND
%TW YOLTS CHN DEG LOCATION 10 22 ODI 3
0.39 1
148 01S +19.42 12 1
ODI 14 0.88 Pl.'125 13S - 0.70 19 15 ODI 13 0.34 1
142 05S +15.10 21.
24 ODI 4
2.51-4 115 02S +14.21 to +16.73 24 1
ODI 25 0.42 P1 127 08S + 0.56 26 69 ODI 18 0.33 1
143 LTS + 9.18 29 104 ODI 19 0.75 1
140 15S +12.80 31 60 ODI 18 0.31 1
143 LTE +21.95 33 71 ODI 10 1.98 4
124 03S +22.71 to +25.11 34 17 ODI 8
2.26 4
112 08S + 4.34 to + 6.53 36 75 ODI 13 0.54 1
146 09S
'.5.12 37 77 ODI 4
0.46 1
152 02S +12.02 39 116 WAR 11 0.23 P1 0
135 - 0.74 50 112 ODI 3
1.80 4
118 07S +14.31 68 1
ODI 13 0.36 P1 127 08S + 0.67 70 63 ODI 6
0.30 1
145 OSS +14.52 ODI 18 0.32 1
140 04S + 9.18 ODI 20 0.22 1
138 04S + 4.56 72 4
ODI 18 0.28 P1 130 08D + 0.70 73 68 ODI 11 0.28 1
146 07S +10.26 74 1
WAR 12 0.32 P1 0
14S + 0.76 75 34 WAR 10 0.26 P1 0
04S + 0.71 77 63 ODI 19 0.22 1
139 08S +35.79 77 68 ODI 15 0.34 P1 132 02S 0.28 78 20 ODI 12 0.E-P1 133 04S + 0.29 78 24 ODI 15
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1 141 LTE + 1.92 81 2
WAR 10 0.29 P1 140 14S + 0.65 83 84 ODI 9
0.42 1
146 11S +34.92 91 126 ODI 17 0.43 1
141 ISS +32.96 93 40 ODI 14 0.81 1
143 LTE + 4.59 94 10 ODI 21 0.25 1
139 OSS + 8.43 102 4
ODI 18 0.40 P1 127 08S - 0.78 106 119 ODI 28 0.31 1
133 15S +17.17 107 17 ODI 6
2.21 4
120 11S +17.33 108 18 ODI 2
1.54 1
151 03S +33.62 ODI 9
0.49 1
147 LTS +36.60 112 1
ODI 11 0.99 1
145 15S +13.69 140 1
WAR 2
0.17 P1 0
10S - 0.77
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ATTACHMENT'4 STEAM GENERATOR.1-2 A LISTING of TUBES PLUGGED ROW TUBE IND
%TW VOLTS CHN DEG LOCATION 4.62 1
15S +18.18 7
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ATTACIDENT 5 STMAN GENERATOR 1-2 A TUBES SLEEVED ROW TUBE TOTAL I
67 1
1 68 1,2 2
69 1-4 4
70 1-5 5-I 71 1-7 7
i 72 1-8 8
73 1-7,10-12 10 74 1-29 29 75 1-7,9-29.31-35 33 I
77 2-28,30-35 33 78 1,3-29 28 79 1-12 12 80 2-8 7
-81 1-7 7
82 1-5 5
83 3,4 2
84 2
1 85 1
1
-49 13 1
61 19 1
72 56 1
74 82 1
Total 199 e
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