ML20073M949
| ML20073M949 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 04/18/1983 |
| From: | ARKANSAS POWER & LIGHT CO. |
| To: | |
| Shared Package | |
| ML20073M948 | List: |
| References | |
| NUDOCS 8304220341 | |
| Download: ML20073M949 (12) | |
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A ARKANSAS NUCLEAR ONE - UNIT ONE, STEAM GENERATOR TUBINGLINSERVICE i INSPECTION REPORT.FOR FIFTH REFUELING OUTAGE IINSPECTION SUPMARY ~'
An inservice eddy current inspection was performed on' tubes in the Arkansas Nuclear _ One Unit 10nce Through Steam Generators (OTSGs) '.'A" and."B" during the period from 10. December 1983 through 25 February 1983. The previous
. inservice inspection,' conducted in January,1981, resulted in a forty (40) month inspection interval (per T.S. 4.18.4.b). -The IRS inspection was
completed within the required interval.
The inspection was conducted in accordance with T.'S. 4.18.3 and T.S. Table 4.- 18. 2. On:13 December 1982, the "B" 0TSG was declared Category C-3 as a-result:of defects-found in and around the lane region (Group A-1 per T.S.
4.18.3.a.3). The "A" 0TSG was declared Category C-3 on 29 December 1982 with defects in the same region of the tubesheet. The NRC staff received
. prompt notification in both these cases with LER followup on 21 December 1982-(LER-82-030, Rev. 0) and 5 January 1983 (LER-82-030, Rev. 1). As a
-result of these classifications, a 100% inspection of all accessible (non plugged, non-obstructed) tubes was conducted.
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In the "A" 0TSG, 15~504 tubes-(of the total 15,531 tubes)-were inspected full length. Of the remaining twenty-seven (27) tubes, twenty-six (26) tubes had been pre'viously plugged and one (1) tube was-sufficiently obstructed to_ prevent passage of the eddy current. probe. In the "B" OTSG, 15,525 tubes were inspected full length. .0f the six (6) remaining tubes, three (3)- had been previously plugged and three (3) were sufficiently obstructed to. prevent passage of the eddy current probe.
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'The multi-frequency method of eddy current testing was utilized during the ,
inspection to determine ~ tube wall degradation. Details of the inspection
. equipment and methodology are attached.
INSPECTION RESULTS Tube wall degradation was observed in both the "A" and "B" 0TSGs. .In the "A" 0TSG, eighty-three'(83) defective tubes (i.e. > 40% through wall imperfections per T.S. 4.18.5.a.5) were plugged. The one (1) obstructed tube was also plugged.' Forty-three (43) defective tubes were plugged in the "B" 0TSG. The three (3) obstructed tubes in the generator were also
. plugged. The plugged tubes were stabilized in accordance with OTSG vendor recommendations.
- 8304220341 830418 gDRADOCK 05000313 PDR 1
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STEAM GENERATOR TUBING INSERVICE, INSPECTION REPORT FOR FIFTH' REFUELING OUTAGE Tables 1 and 2, attached, list the defective tubes for-the "A" and "B" OTSGs,'respectively. Defect location and size (% through-wall) are also listed. -Tables 3 and 4 list the remaining reportable indications (> 20 but
< 40 % through-wall imperfections per T.S. 4.18.5.a.1) in the "A" and "B"
- OTSGs. Defect location and size are also provided.
These lists complete the reporting requirements of T.S. 4.18.6.
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TABLE 1: ' A" 0TSG TUBE DEFECTS (> 40% TW INDICATIONS)
Row-Tube Location % TW 6 4-5 (1) 53' 24-5 14-15 51 24-35 .UTSM (2) 42 31-17 UTSM' 59 32-95 UTSM 57 37-97 15-UTS 60 37-97 15-UTS 45 97 UTSM 45 37-101 LTSM (3) 67 38-57 8-9 75 38-103 UTSM 41 39 UTSM 42 42-1 UTSM 53 46-108 UTSM 44 49-111 UTSM 32'
.49-111 UTSM 49 58-13 UTSM 47 58-13 UTSM 32 58-14 UTSM 52 61-7 UTSM 52 62-10 UTSM 63 62-11 UTSM 53 64-103 13-14 64
.65-10 UTSM 70 65-14 UTSM 43 65-16 UTSM 46 65-16 UTSM 25
.66-11 UTSM 44 66-11 UTSM 30 67-1 UTSM 62.
67-1 UTSM 39 68-12 UTSM 57 68-14 UTSM 50 68-54 UTSM 47 69-1 UTSM 80 69-1 UTSM 41 69-3 UTSM 46 69-5 UTSM 46 69 UTSM 53 69-12 UTSM 66 69-48 UTSM 41 69-57 14-15 65 69-57 14-15 34 70-36 UTSM 59 71-5 UTSM 43 71-10 UTSM 59 3
TABLE 1: "A" OTSG TU8E DEFECTS (> 40% TW INDICATIONS)
-Row-Tube Location % TW 71-12 UTSM 40 71 UTSM 45-71-15 UTSM 51 71-22 UTSM 71 71-22 UTSM 35 71-24 UTSM 51 71-24 UTSM 53 71-24 UTSM 79' 71-27 UTSM 44 71-33 UTSM 46
?71-33 UTSM 54 71-36 UTSM 43 71-36 UTSM 27 72-8 UTSM 48 72-10 UTSM 43 72-10 UTSM 45 72-12 UTSM 55 72-12 UTSM 39 72-12. UTSM- 64 72-15 UTSM 58 72-19 UTSM 47 73-68 UTSM 57 73-68 UTSM 23 74-87 UTSM 41 75-4 15 41 4 15 27 75-6 15 52 75-10 15- 53 75 10-11 46 75-32 UTSM 51 75-65 UTSM 44 80-2 UTSM 51 80-7 UTSM 59 80 UTSM 47 80-11 UTSM 28 80-11 UTSM 66 80-11 UTSM 72 80-12 UTSM 44 80-12 UTSM 50 80-13 UTSM 54 80-13 UTSM 33 80-17 UTSM 70 80-21 UTSM 40 80-23 UTSM 37 80-23 UTSM 49 80-66 UTSM 40 4
TABLE 1: "A" 0TSG TUBE DEFECTS (> 40% TW INDICATIONS)
Row-Tube Location- '% TW 81 UTSM 47 81-3 UTSM 44' 81-10. UTSM 24 81-10 UTSM 51 81-10 UTSM 27 81-10. UTSM 30 81-13 UTSM 59 82-11 UTSM 57
.82-60 1-2 83 83-6 UTSM 68.
83-7 UTSM 67 83-10 UTSM 42 85 UTSM 42 85-1 UTSM 56 85-1 UTSM 60 86-1 UTSM 73 87-81 12-13 47 91-7 UTSM 44 97-17 UTSM 41 97-125 15-UTS '
69 116-111 UTSM 34 116-111 UTSM 41 134-34 NA (4) Obstructed (1) Designation for defects / imperfections between tube support plates,
-in this case between the 4th and 5th tube support plates. A single number designates a defect at the tube support plate.
(2) Defect in the upper tube sheet midspan.
(3) Defect in the lower tube sheet midspan.
(4) Obstruction prevented inspection.
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TABLE'2: ~"B" OTSG TUBE DEFECTS (> 40% TW INDICATIONS)
. Row-Tube' Location % TW 29 5-6 (1) <40 39-89 6-7 22 39-89 6-7 57 -
'41-96: UTSM 43
- 98. 12-13 63 43-99 2-3 57 44-49 3-4 64 68-22 UTSM 45 70-2 UTSM 42 70-2 UTSM 36 70-2 UTSM '41 70-2 UTSM 41 70-4 'JTSM 50 70-14 UTSM .59
'71-1 UTSM 25-71 UTSM 42
. 71-1 UTSM 37 71-2 UTSM 69 71-2 UTSM 28 71-2 UTSM 51 71-2 UTSM 39
'72-5 UTSM 43 72-5 UTSM 28 72-49 UTSM 41 73-8 UTSM 84 73-8 UTSM 36 73-8 UTSM 60 73-8 UTSM 84 73-8 UTSM 84 73-9 UTSM 52 74-5 UTSM 64 74-9 UTSM 57 74-9 UTSM 62 74-12 7-8 43 74-26 UTSM 68 75-2 UTSM 56 75-2 UTSM 46 77-55 UTSM 52
.77-63 UTSM 20 77-63 UTSM 40 78-2 UTSM 80 78-2 UTSM 74 78-2 UTSM 40 78-2 UTSM 47 t
(1) See Table 1 for nomenclature.
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TABLE 2: "B" 0TSG TUBE DEFECTS (> 40% TW INDICATIONS)
-Row-Tube Location % TW 78-6 UTSM 54 78-21 UTSM 51 80-1 UTSM 80 80-1. UTSM 68 80-1 UTSM 56 80-1: UTSM- 63 1 UTSM 22 80-2 UTSM 42 80-2 UTSM 46 80-5 UTSM 41
.80-62 UTSM 63 81-2 UTSM 46 81-2 UTSM 96
'81-2 UTSM 69 81-2 UTSM 69 81-2 UTSM 50 81-2 UTSM 89 81-2 -UTSM 24 81-4 UTSM 71 81-6 UTSM 57 81-6 UTSM 76 82-2 UTSM 80 82-24 UTSM 42 85-28 UTSM 45 88-30 UTSM 36 88-30 UTSM 48 88-30 UTSM 40 89-2 UTSM 48 89-54 LTS-1 48 92-117 8-9 53 92-117 13-14 23 94-44 7-8 51 105-27 UTSM 22 105-27 UTSM 30
( 105-27 UTSH 43 108-22 UTSM 43 108-22 UTSM 32 108-22 UTSM 30 112-19 14-15 63
, 138-37 LTS-1 85 27-39 NA Obstructed 31-101 NA Obstructed 65-5 NA Obstructed i
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TABLE 3: "A" 0TSG' DEGRADED TUBES
(> 20% TW BUT < 40% TW INDICATIONS)
Row-Tube Location % TW 10-31 UTSM (1) 26 12-46 UTSM 25 21-55 UTSM 36 l 26-55 UTSM- 24
.29-49 15-UTS 26
- 31-13 UTSM 34 39-13 UTSM 31 39-18 UTSM 24
'48-15 UTSM 25 50-22 UTSM 39 51-111 1-2 36 52-9 UTSM 39 57-9 UTSM 38' 57-29 UTSM 36 61-75 UTSM 38 61-117 UTSM 20 65-1 UTSM 38 65-11 UTSM 21 65-80 10-11 31 66-24 UTSM 31 68-2 UTSM 33 68-11 UTSM 37 69-13 UTSM 37
.71-11 UTSM 36 71-25 UTSM 26 71-34 UTSM 24 71-55 UTSM 23 71-61 UTSM 22 72-5 UTSM 23 72-7 UTSM 39 72-7 UTSM 24 l
72-7 UTSM 20 72-18 UTSM 37 72-106 UTSM 20-72-130 10 24 l 73-6 UTSM 23 75-5 14 27 75-14 UTSM 34 l 75-14 UTSM 31
- 75-64 12-13 39 77-11 UTSM 36 (1) See Table 1 for nomenclature.
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TABLE 3: "A" OTSG DEGRADED TUBES
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(> 20% TW BUT < 40% TW INDICATIONS)
Row-Tube Location' % TW
- 179-123 12-13' 21 F
81-121 UTSM 33 81-14 10-11. 26 81-19 -UTSM: 35 ,
4 81-54 UTSM 31 81-63 .13-14 20 82-59 'UTSM 27 82-62. 4 UTSM 32 83-11 UTSM 35 84-11 UTSM 36 84-12' LTSM 28 85-2 UTSM 35 86-12 UTSM 34 87-1 UTSM 29 87-11. UTSM 34 88-4 9 38 90-9 UTSM 27 96-120 UTSM 21
~100-62 5 24 102-81 8-9 35 103-120 UTSM 36 104-2 -UTSM 21 105-121 UTSM 25 107-13 UTSM 28 117-100 'UTSM 30 119-13 UTSM 36 119-92 UTSM 27
. 126-97 UTSM 32 127-49 9-10 39 b
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~ '- TABLE-4: "B"'OTSG DEGRADED. TUBES f(>'.20% TW BUT < 40% TW INDICATIONS)-
Row-Tube -Location. % TW i 7-13 -
9~(1) : 24 11-16 14-15 30 14-66 2-3 '26 72
- 6-7 24-21-72 8-9 26-4 22-28' 13-14 31=
35-37 6-7 22' 38-16 3 25 41-2 UTSM 28 51 11-12 26
. 60-11 UTSM -25 1 60-32 : UTSM ' 26 64-4 UTSM - 23 67-7 UTSM 38
'67 15-UTS '35 I 70-26 -UTSM 23 f
70-90 8-9 20 --
'- '71-5 UTSM 28 72-20 UTSM 28
.72-30 UTSM 32 73-15 UTSM 38 74-4 UTSM 35
'74-8 UTSM 31 0 74-8 UTSM 29
- s. 77-14 UTSM 38 1
79-7 8 37 79-26 UTSM 22 79-41 8-9 30 80-8 -UTSM- 36
) 81-10 UTSM 21 82-10 UTSM 23
- 83-2 UTSM' 29 83-2 UTSM 36 84-2 UTSM 31 o 85-39 5 29 87-24 UTSM 32
, ~96-6 UTSM 22 96-42 14-15 32
- 103-25 UTSM ?.8
! 107-120 UTSM- 28 d
110-87 7-8 30 121-3 15-UTS 32 123-2 14-15 22 n 123-56 11-12 35
'131-6 2-3 22
-139-64 1-2 25 149-3 6 36 149-3 11-12 39 (1) See Table 1 for nomenclature.
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ATTACHMENT EQUIPMENT AND METHODOLOGY-i,
. The inspection program satisfied the requirements of the USNRC Regulatory Guide 1.83, Revision 1 (July, 1975),1" Inservice Inspection of Pressurized.
-Water Reactor Steam Generator Tubes." .The program was conducted in i accordance with approved vendor-supplied procedures and the ANO-1 Technical Specifications.
The -inspection program utilized multi-frequency eddy current techniques' to
- collect defect and debris / sludge data. The following frequencies were used:
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Channel 1 - 400 kHz - Defect Analysis c Channel 2 - 200 kHz - Defect Analysis
' Channel.3 - 600 kHz - Defect Analysis Channel 4 - 35 kHz - Debris / Sludge Analysis Differential. eddy current probes were used to examine the OTSG tubing from the primary side of the lower tube sheet to the primary side of the. upper tube. sheet.- A 0.500" OD probe was used for.the inspection. A~0.460" probe was used for tubes where denting or obstructions prevented passage'of the larger probe. The probes were attached to nylon tubing to allow insertion
, and-withdrawal. The instrument leads and a safety wire passed through the nylon tube. A ZETEC.Model 2-D probe driver was used to insert and withdraw the' eddy current probe'at constant speed.
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- Eddy _ current calibration standards were-manufactured from Inconel-600.0.625"
- OD tubing having nominal 0.037" wall thickness. Artifical defects were machined into the tube surface in accordance with Regulatory Guide 1.83, Revision 1.
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The B&W Eddy Current Manipulator and associated control equipment was used for remote positioning of the probe at the desired tube location. A closed
> circuit television system mounted on the manipulator arm was used to observe
! probe movement and to verify probe position.
An MIZ-12 multi-frequency eddy current tester was used to generate the eddy current tect signals.and to monitor the return-signals to determine the conductivity and/or permeability of the tube being tested. A change in
[ conductivity is related to a discontinuity (imperfections) in the tube wall l material. A " time-sharing" technique was used to' test up to four (4) eddy current frequencies simultaneously. The MIZ-12 contains mixing circuits i which allow the eddy current analyst to subtract out undesirable data (i.e.,
l noise support signals, etc.). A CRT display was used to view the mixer output as well as the test signals.
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EQUIPMENT AND METHODOLOGY ..
The MIZ-12 output' signals were recorded on a strip charts and eight channel magnetic tape. The magnetic tape signals were subsequently analyzed by Level II or Level III eddy current examiners to locate and characterize tube defects. Standard eddy current analysis techniques were used. Original strip charts and magnetic tapes produced in the examination will be maintained at ANO.
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