ML20059L719

Steam Generator Tubing ISI Rept for Eleventh Refueling Outage

ML20059L719
Person / Time
Site:	Arkansas Nuclear
Issue date:	11/12/1993
From:	ENTERGY OPERATIONS, INC.
To:
Shared Package
ML20059L721	List: 1CAN119306, Forwards Steam Generator Tubing ISI Rept for Eleventh Refueling Outage ML20059L719
References
1CAN119306, NUDOCS 9311170312
Download: ML20059L719 (18)

Text

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Attachment to ICAN119306 Page 1 of 18 ARKANSAS NUCLEAR ONE - UNIT 1 STEAM GENERATOR TUBING INSERVICE INSPECTION REPORT FOR THE ELEVENTH REFUELING OUTAGE INSPECTION

SUMMARY

An insenice eddy current inspection was performed on tubes in the Arkansas Nuclear One, Unit 1 (ANO-1) Once Through Steam Generators (OTSGs) "A" and "B" during September 1993. The previous insenice inspection, conducted in March 1992, resulted in an eighteen month inspection interval per ANO-1 Technical Specification 4.18.4.a.

The eleventh refueling outage (1R11) inspection was conducted in accordance with Technical Specification 4.18. The inspection included a first sample (twenty percent) full length examination of both OTSGs, with exceptions as provided in Technical Specification 4.18.3.a.

Subsequent samples in both OTSGs were inspected per Technical Specification Table 4.18-2.

The subsequent insenice inspection shall be conducted at a 10 to 24 month interval in accordance with the Technical Specifications.

In the "A" and "B" OTSGs respectively, 3991 and 4066 tubes without prior repairs were inspected full length,409 and 496 sleeved tubes were inspected full length, and 3569 and 3536 non-plugged tubes in the wedge region (described by Technical Specification 4.18.3.a.3(3) and Technical Specification Figure 4.18.1) were inspected from the 15th tube support plate (TSP) up.

This repons supplement.; information provided to the NRC in letter ICAN109304 (dated October 6,1993), which was submitted per Technical Specifications 4.18.6 and 6.12.5.d as a result of the "A" OTSG lane region C-3 results.

INSPECTION RESULTS Tube wall degradation was observed in both the "A" and "B" OTSGs. In the "A" OTSG,21 tubes were identified to have 2 40% throughwall (TW) imperfections (defective per Technical Specification 4.18.5.a.6) and/or distorted or non-quantifiable indications. Of these,20 tubes were plugged and one was sleeved. Additionally, 76 tubes in and around the lane region were sleeved as part of a now completed preventive sleeving program which began in IR8.

In the "B" OTSG,12 tubes were identified to have 2 40% TW imperfections and/or distoned or non-quantifiable indications. All 12 of these tubes were plugged. Eleven of the twelve indications were located within the upper tubesheet region, while the remaining one was near the upper tubesheet region in the 16th span.

9311170312 931112 '

DR ADOCK 05000313 PDR j

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Attachment to l 1CAN119306

! Page 2 of 18 l All but two of the 21 defective tubes in the "A" OTSG were found within the upper tubesheet

] region, with most concentrated near the open lane region. One of these two tubes, which was

! included in the first random sample, contained a volumetric indication at the upper edge of the

7th tube support plate (TSP). The tube was on the periphery of the bundle, suggesting the

, damage was most likely attributable to wear caused by steam cro;s flow at the aspirating port region of the OTSG. The aspirating port provides steam into the feedwater annulus for preheating of the feedwater in the downcomer region. This tube also had a flaw in the upper 3 tubesheet indicative ofintergranular attack (IGA). The other tube (located in the lane region)

exhibited a volumetric type non-quantifiable indication at the 1Ith TSP which was confirmed  ;

by a rotating pancake coil (RPC) probe. This flaw was measured by RPC to have a circumferential extent of 0.08" and an axial extent of 0.10" Using an estimated phase angle l from the bobbin coil distorted signal, the depth was estimated to be 13% TW.

l Twenty non-quantifiable bobbin indications were also inspected- with RPC for further diagnosis. Of these,18 were classified as volumetric indications and two were identified as circumferential indications. The largest circumferential extent of any of the 18 volumetric indications, as measured by the RPC analysis software program, was 0.52" This flaw also had an axial extent of 0.38" and was located within the upper tubesheet (Row 47 Tube 3 in ,

the "B" OTSG). This flaw, as well as most of the other repairable indications, is indicative of the IGA known to exist in the upper tubesheet based upon analysis of tubes pulled in the 1978-1984 timeframe. No tubes have been pulled since 1984. A discussion of the pulled tube i

analysis was provided to the staffin ICAN098304, dated September 15,1983. Information is 1 also contained in EPRI Reports NP-4504-LD, NP-2790 and NP-7346-SD.

Of the flaws that were examined with RPC, the deepest one measured was 77% TW (determined from estimated bobbin phase angle). That particular flaw had circumferential and axial extents of 0.12" x 0.04", respectively, which is well below that required for stmetural adequacy, as defined by Draft Regulatory Guide (RG) 1.121. This determination is based upon work performed by ANO as part of the original sleeve qualification program, which

) developed allowable tube degradation in accordance with RG 1.121. For the largest RPC i measured circumferential and axial extent flaw, mentioned in the above paragraph, no % TW could be assigned because of the nature of the signal. However, based on the RG analyses, this flaw was well within the requirements of RG 1.121. In addition, a re-analysis of this tube at the last outage revealed the presence of the same flaw with little or no growth. The average size of flaws tested with RPC was 0.19" circumferential extent and 0.14" axial extent.

Average depth was not determined because some of the flaws contained distorted signals that i j did not allow the use of the standard phase analysis to determine depth.

The two tubes previously mentioned which contained circumferential indications had been 1 ilagged as "R36" codes during the standard bobbin examination of the lane region. This meant that the analyst had detected an anomalous signal and had requested an RPC probe be I used for dispositioning the indications. These two signals were coincident with tube dents.  !

Upon examination with the RPC prebe, it was determined that volumetric-type flaws with circumferentially oriented " crack-like" portions were present. This was based on a l l comparison of the different coils of the 3-coil RPC probe. The total circumferential extent of

Attachment to ICANI19306 Page 3 of18 the larger of the two flaws was approximately 60 degrees. The other flaw measured approximately 40 degrees. The amplitudes of these flaws as measured by bobbin were 8.7 and 10.5 volts, respectively (dents are reported in accordance with the ANO Guidelines on the 600/200 kHz mix). The dent voltage calibration is determined by setting the four 20% holes in the calibration standard to 4 volts. Both of these flaws were well within analysis performed in accordance with RG 1.121 for determining structurally significant flaws. As a result of finding these two flaws, all tubes in the lane region of the "A" OTSG above the 15th TSP containing dents (as identified by the bobbin probe) were examined with the RPC probe at the dent. Four additional volumetric indications were reported, with none exhibiting crack-like characteristics. In general, these dents are believed to be small because standard size probes can pass through the affected area of the tubes with no restrictions. The RPC scope was then expanded to include all dents in both OTSGs from the 15th TSP and up. No additional indications were detected in this sample. In addition,136 dents in the "A" OTSG and 38 in the "B" OTSG in the lower tubesheet region, as well as the remaining tubes without dents in the upper lane region of the "A" OTSG (29) were inspected, with no indications detected. In all,3S4 dents in the "A" OTSG and 84 in the "B" OTSG were inspected with the RPC probe.

Indications were determined to be isolated to the "A" OTSG lane region at the secondary face of the upper tubesheet, most likely due to higher temperature (hot leg tubesheet), contaminant cargover and subsequent deposition from the steam.

The inspection also identified 241 tubes in the "A" OTSG and 75 tubes in the "B" OTSG with indications measuring 20-39% TW. A review and partial re-analysis of the previous data for indications 2 20% TW indicated that 35 flaws appeared to have exhibited growth (based on phase analysis). Of these 35 flaws, eighteen also showed growth in amplitude. The highest growth flaw identified during IRI1, present in Tube 72-28 in the "A" OTSG, was a 61% TW, 1.21 volt indication which was not present in the previous outage data. Of the 18 tubes l exhibiting growth in both phase and amplitude, most growth was small and could very well be within the variability of the eddy current technique. Most of the indications found during this l outage were also present at the last outage.

Tables 1 and 2, attached, list the defective tubes in the "A" and "B" OTSGs, respectively.

Defect locations and size (% TW) as indicated by the primary inspection technique (bobbin

, coil) are also listed.

l Tables 3 and 4 list the remaining reportable indications (> 20% TW but < 40% TW imperfections per Technical Specification 4.18.5.a.4) in the "A" and "B" OTSGs.

Degradation location, size and disposition, if any, are also provided.

Table 5 lists the tubes sleeved as a preventive measure in the "A" OTSG. No tubes were sleeved in the "B" OTSG.

Tables 6 and 7 list the mechanical plugs (ribbed and explosive) repaired with remote welded plugs in the "A" and "B" OTSGs, respectively.

Attachment to  ;

ICANI19306  ;

Page 4 of18 PLUG REPAIR The ANO plug repair program continued this outage with the repair of 25 mechanical plugs (1 l ribbed from heat W945-1, and 24 explosive) in the "A" OTSG and 30 mechanical plugs (17  ;

i ribbed from heat NX-3531, and 13 explosive) in the "B" OTSG. These plugs were repaired  !

due to concerns for primary water stress corrosion cracking (PWSCC) or IGA. The repair l l

consisted of machining the end of the plug and inserting a remotely installed welded plug on _

top. This technique removes the pressure difTerential from the old plug and results in a lower l dose when compared to plug removal. [

CONCLUSIONS l

Based on the inspections performed and the repairs made to the tubes and the PWSCC l susceptible plugs, the ANO-1 OTSGs are considered acceptable for the duration of Cycle 12.

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1CANI19306 Page 5 of18 TABLE 1 "A" OTSG TUBE DEFECTS

(>40% TW & I-CODES)

1. RO3V TUBE IND. LOCATION 1 10 50 54 UTSF + 7.71 2 26 95 47 UTSF + 16.71  ;

3 58 16 NQI UTSF + 3.25 4 61 11 42 UTSF + 9.24 5 64 7 NQ1 UTSF + 10.49 6 69 2 87 UTSF + 9.31 56 7TH TSP + 0.60 7 72 28 61 UTSF + 3.71  ;

8 73 43 NQI llTH TSP - 0.14 9 74 52 SCI UTSF + 0.19 10 74 57 MCI UTSF + 0.25 11 77 49 VOL UTSF + 0.32 12 77 56 VOL UTSF + 0.18 13 77 61 VOL UTSF - 0.13 14 78 47 VOL UTSF + 0.34 15 80 26 NQI UTSF + 0.23 16 90 2 NQI UTSF + 5.44 t 17 104 52 NQI UTSF + 9.90 ,

18 106 15 NQI UTSF + 8.16  !

19 110 47 63 UTSF + 18.64 l' 20 114 106 50 UTSF + 4.62 21 146 41 NQI UTSF + 7.73 NOTE: Row 90 Tube 2 was repaired by sleeving; all others above were plugged.

j LEGEND: UTSF - Upper Tubesheet Secondary Face i IND - Indication Type or %TW l l NQI - Non-Quantifiable Indication l

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VOL - Volumetric Indication SCI - Single Circumferential Crack MCI - Multiple Circumferential Crack UTSF + X.X - Defect located X.X inches above the UTSF 12TH TSP + X.X - Defect located X.X inches above the 12th TSP i  !

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( Page 6 of18 l  ;

TABLE 2 i "B" OTSG TUBE DEFECTS  !

(> 40% TW & I-CODES) l t

1. ROW TUBE IND. LOCATION  !

l 38 5 NQI UTSF +6.19 2 45 3 40 UTSF + 6.72 3 47 3 NQI UTSF + 18.44 ,

4 48 2 NQI 15TH TSP + 22.91  !

5 65 36 NQI UTSF + 5.04  !

6 67 25 NQI UTSF + 2.91 7 69 26 43 UTSF + 6.91 ,

8 79 48 NQI UTSF + 5.93  ;

9 80 59 NQI UTSF + 6.07 i 10 81 13 44 UTSF + 3.93 I 11 83 36 50 UTSF + 6.09  !

12 113 2 42 UTSF + 4.53  !

I LEGEND: UTSF - Upper Tubesheet Secondary Face j IND - Indication Type or %TW

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NQI - Non-Quantifiable Indication .

UTSF + X.X - Defect located X.X inches above the UTSF 12TH TSP + X.X - Defect located X.X inches above the 12th TSP I

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Attachment to 1CAN119306 Page 7 of18 TABLE 3 '

"A" OTSG TUBE DEGRADATION  !

(20-39% TW INDICATIONS) l l

1. ROW TUBE %TW LOCATION t 1 4 5 24 6TH TSP + 35.40 2 6 27 26 10TH TSP + 1.41 3 7 52 33 15TH TSP + 39.33 i 4 8 39 27 UTSF + 6.65 ,

5 9 32 27 UTSF + 5.99 l 6 9 39 35 15TH TSP + 24.74 7 9 60 31 10TH TSP + 0.41 i 8 11 30 23 UTSF + 7.65  !

9 12 24 22 UTSF + 5.94 e 10 12 40 39 UTSF + 6.51  !

11 13 25 33 UTSF + 7.33 12 14 26 36 UTSF + 9.30 13 15 37 32 UTSF + 7.50 l 14 17 44 23 UTSF + 18.54 i 15 20 8 29 15TH TSP + 24.87  ;

16 20 57 20 12TH TSP + 3.39 17 23 63 20 13TH TSP + 18.77 j 18 23 75 33 ISTH TSP + 0.73  :

l 19 24 16 23 UTSF + 9.27 20 24 48 24 LTSF + 30.62  !

21 24 48 34 LTSF + 33.59 22 26 24 26 UTSF + 20.58  !

23 26 55 35 UTSF + 6.69 24 26 65 27 13TH TSP + 6.56 -

25 27 4 28 UTSF + 6.95 l 26 27 31 25 UTSF + 4.48  !

27 27 31 28 UTSF + 5.58  ;

28 27 100 36 7TH TSP + 0.39 l 29 28 1 23 10TH TSP + 0.53 30 28 8 28 UTSF + 1810 31 29 49 26 15TH TSP + 31.65  ;

32 29 49 27 1STH TSP + 29.22 33 29 49 30 15TH TSP + 35,71  ;

34 30 14 20 LTSF + 22.75 ,

35 32 11 36 13TH TSP + 15.85 36 32 56 23 7TH TSP - 0.43 37 32 94 22 UTSF + 8.16 t

Attachment to 1CAN119306 Page 8 of18 TABLE 3  :

"A" OTSG TUBE DEGRADATION I

(20-39% TW INDICATIONS)

(Continued)

1. ROW TUBE %TW LOCATION ,

l 38 33 77 29 LTSF + 24.99 I 39 33 101 36 UTSF + 13.31  ;

40 37 12 38 UTSF + 5.78 -

r 41 37 13 31 UTSF + 9.67  ;

42 39 11 27 10TH TSP + 16.27 6 43 39 47 20 UTSF + 5.51 44 39 89 22 4TH TSP + 10.64 ['

45 40 13 31 UTSF + 6.34 46 40 15 35 UTSF + 7.81 47 40 36 28 UTSF + 4.41 48 40 50 30 15TH TSP + 5.95 49 41 3 29 UTSF + 12.20 i 50 41 15 25 UTSF + 11.42 i 51 42 101 29 12TH TSP + 33.07 l 52 44 108 28 UTSF + 9.23  !

53 45 3 38 UTSF + 8.67  ;

54 48 24 22 UTSF + 5.48 l 55 48 110 24 6TH TSP + 27.64 i 56 51 21 32 UTSF + 10.75 57 51 95 30 12TH TSP + 11.58 58 52 52 20 UTSF + 18.10 ,

59 53 115 21 UTSF + 16.57 60 54 49 32 IST TSP + 7.15 61 54 53 28 UTSF + 14.73 62 54 53 39 UTSF + 11.69 63 55 123 28 UTSF + 10.28 64 56 3 27 UTSF + 9.39 65 56 124 34 UTSF + 9.87 66 56 125 23 UTSF + 7.56 67 57 12 29 UTSF + 5.97 68 58 45 23 2ND TSP + 33.06 i 69 59 8 24 UTSF + 10.32  ;

70 59 9 25 UTSF + 10.59 l 71 59 17 20 UTSF + 9.49 I 72 59 113 36 UTSF + 11.01 l 73 60 2 26 UTSF + 6.83 l 1

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Attachment to ICAN119306 Page 9 of18 TABLE 3

" A" OTSG TUBE DEGRADATION (20-39% TW INDICATIONS)

(Continued)

%TW LOCATION

1. R_.OW TUBE 20 4TH TSP + 16.67 74 60 52 33 UTSF + 10.48 75 60 124 36 UTSF + 6.51 76 61 40 35 UTSF + 4.14 77 61 111 20 UTSF + 10.95 ,

78 64 53 35 UTSF + 11.86 79 65 56 27 UTSF + 5.50 [

80 65 57 37 UTSF + 15.63 I 81 65 63 73 22 2ND TSP + 11.90 82 65 77 31 6TH TSP - 0.40 83 65 80 31 10TH TSP + 26.60 84 65 25 UTSF + 16.87 85 66 12 29 UTSF + 8.66 86 66 123 28 UTSF + 4.92 87 67 120 8 37 UTSF + 10.62 88 68 29 UTSF + 11.52 89 68 16 33 UTSF + 5.82 90 68 59 105 25 LTPF + 14.95 91 68 36 UTSF + 7.38 92 69 10 16 34 UTSF + 3.04 93 69 20 UTSF + 11.32 94 69 30 40 26 UTSF + 17.20 95 u9 40 33 UTSF + 9.45 96 69 54 27 UTSF + 12.45 97 69 54 29 UTSF + 12.61 98 69 74 29 UTSF + 17.34 99 69 28 UTSF + 7.78 100 70 21 21 34 UTSF + 19.06 101 70  !

31 UTSF + 5.83 /

102 70 26 20 UTSF + 13.59 I 103 70 56 29 UTSF + 0.81 104 71 57 28 39 UTSF + 6.16 105 72 l 32 25 UTSF + 6.57 106 72 55 20 UTSF + 13.97 107 72 56 26 UTSF + 4.57 108 72 106 30 UTSF + 11.66 109 72

Attachment to ICANI19306 Page 10 of18 TABLE 3 "A" OTSG TUBE DEGRADATION (20-39% TW INDICATIONS)

(Continued)

1. ROW TUBE %TW LOCATION 110 72 130 36 10TH TSP + 0.58 111 73 83 33 6TH TSP - 0.36 112 73 124 33 LTSF + 40.06 113 74 55 25 UTSF + 19.54 114 74 58 20 UTSF + 14.24 115 74 64 36 UTSF + 0.48 116 76 88 23 15TH TSP + 44.47 117 76 92 20 6TH TSP - 0.40 118 76 109 22 6TH TSP + 0.49 119 77 88 23 UTSF + 11.00 120 77 100 32 4TH TSP + 17.37 121 19 2 27 UTSF + 4.ll 122 80 6 22 UTSF + 3.18 123 80 6 30 UTSF + 2.78 124 80 29 30 UTSF + 0.83 125 80 51 20 STH TSP + 0.45 126 80 67 32 UTSF + 1.94 127 81 7 28 UTSF + 8.04 128 81 7 28 UTSF + 6.57 129 81 25 23 UTSF + 18.01 130 81 49 22 UTSF + 0.60 131 81 56 28 UTSF + 9.37 132 81 57 39 UTSF + 8.80 133 82 27 29 UTSF + 7.05 134 82 31 25 UTSF + 14.41 1 135 83 8 36 UTSF + 4.87 136 83 122 34 UTSF + 1.76 137 83 122 26 15TH TSP + 39.38 138 84 5 36 STH TSP + 0.32 139 84 45 23 UTSF + 16.10 140 85 5 33 UTSF + 0.69 141 85 13 28 UTSF + 6.70 j 142 85 26 20 UTSF + 8.19 143 85 53 39 UTSF + 15.21 144 86 12 27 10TH TSP - 0.79 145 86 16 20 UTSF + 4.80 l

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Attachment to 1CAN119306 Page 11 of18 TABLE 3 "A" OTSG TUBE DEGRADATION (20-39% TW INDICATIONS)

(Continued)

! ROW TUBE %TW LOCATION 146 86 34 34 UTSF + 8.47 147 86 110 21 LTSF + 21.36 148 86 130 38 UTSF + 3.42 149 87 3 31 UTSF + 7.60 150 87 79 20 IST TSP + 31.49 151 88 4 30 UTSF + 4.17 152 88 129 20 2ND TSP + 32.17 153 89 1 20 UTSF + 6.78 154 92 2 22 UTSF + 0.95 155 92 119 25 UTSF + 5.99 156 94 2 24 UTSF + 6.22 157 94 2 32 UTSF + 1.06 158 94 5 31 UTSF + 11.29 159 94 18 39 UTSF + 8.92 160 98 122 30 UTSF + 9.56 161 99 14 31 UTSF + 9.66 162 99 17 26 UTSF + 8.28 163 99 23 20 14TH TSP + 27.39 164 99 123 22 UTSF + 8.70 165 100 16 20 LTSF + 30.48 166 102 14 37 UTSF + 9.91 167 102 95 23 14TH TSP + 0.36 168 102 116 21 4TH TSP + 13.15 169 102 116 22 4TH TSP + 32.74 l 170 102 116 23 6TH TSP + 7.18 171 102 116 38 8111 TSP + 5.90 !

172 104 15 26 UTSF + 7.98 173 104 15 36 UTSF + 11.12 174 104 50 21 3RD TSP + 31.23 175 104 102 27 3RD TSP - 0.33 176 105 3 22 UTSF + 12.91 l l

177 105 3 23 UTSF + 8.24 178 105 9 34 UTSF + 5.25 179 105 21 30 15TH TSP + 31.13 180 105 45 38 UTSF + 10.55 181 112 59 26 1ST TSP + 1.37 i

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I Attachment to l ICAN119306 j Page 12 of18 TABLE 3 "A" OTSG TUBE DEGRADATION ,

(20-39% TW INDICATIONS)

(Continued)

1. ROW TUBE %TW LOCATION 182 I14 106 33 UTSF + 3.53 l 183 114 113 23 UTSF + 10.14 1 184 115 4 37 STH TSP + 0.38  !

185 116 72 26 UTSF + 13.93 .

I86 118 63 20 2ND TSP + 4.49  !

187 118 63 20 3RD TSP + 6.35 188 120 99 22 UTSF + 16.35 189 120 106 27 UTSF + 3.31 ,

190 123 9 28 UTSF + 8.02 191 123 100 21 UTSF + 6.35 192 124 12 39 UTSF + 10.95

• 193 125 3 23 13TH TSP + 2.02 194 127 27 31 UTSF + 3.50 ,

195 127 49 23 9TH TSP + 4.81 i 196 128 89 29 15TH TSP + 8.09 197 130 3 25 UTSF + 10.81 l 198 131 58 36 15TH TSP + 0.88 199 132 29 21 UTSF + 6.89 200 134 31 30 UTSF + 9.48  ;

i 201 136 2 36 1ITH TSP + 4.97 202 137 34 21 STH TSP + 2.42 l 203 138 31 27 UTSF + 5.38 204 138 72 39 UTSF + 6.39 205 139 31 26 UTSF + 5.48 l 206 139 34 28 UTSF + 5.35 i l

207 140 19 32 UTSF + 20.33 208 140 29 23 UTSF + 5.05 209 142 28 35 UTSF + 3.69  !

210 144 26 23 2ND TSP + 20.10 211 144 26 28 2ht TSP + 27.87 212 144 26 28 2ND TSP + 21.85 213 144 26 33 IST TSP + 16.46  !

214 144 26 20 13TH TSP + 31.10  !

215 146 48 20 UTSF + 6.75 216 148 6 37 UTSF + 6.69 217 148 31 35 13TH TSP + 16.82 t 1

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l l Attachment to 1CANI19306 Page 13 of18 TABLE 3 "A" OTSG TUBE DEGRADATION (20-39% TW INDICATIONS) l (Continued) i LEGEND: UTSF - Upper Tubesheet Secondary Face l LTSF - Lower Tubesheet Secondary Face  !

LTPF - Lower Tubesheet Primary Face UTSF + X.X - Defect located X.X inches above the UTSF 12TH TSP + X.X - Defect located X.X inches above the 12th TSP i

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Attachment to ICAN119306 Page 14 of18 TABLE 4 l "B" OTSG TUBE DEGRADATION .

(20-39% TW INDICATIONS)

1. ROW TUBE %TW LOCATION 1 25 2 22 13TH TSP + 24.23 2 26 18 22 UTSF + 5.13 3 43 5 27 UTSF + 0.53 4 49 35 9TH TSP - 0.86 33 5 50 2 24 UTSF + 4.57 6 51 16 25 UTSF + 3.18 7 54 2 27 UTSF + 4.48 8 56 121 21 4TH TSP + 36.43 9 58 41 24 UTSF + 4.65 10 62 4 26 UTSF + 5.22 .

I1 63 50 20 6TH TSP + 5.01 12 64 3 24 LTSF + 38.77  !

13 65 7 24 UTSF + 6.47 14 66 24 20 9TH TSP - 0.74  :

15 66 51 28 LTPF + 7.56 l 16 67 13 21 UTSF + 11.07 l 17 68 15 28 15TH TSP + 8.67  ;

i 18 68 26 32 10TH TSP - 0.76 l 19 68 69 20 LTPF + 22.17 20 69 25 25 UTSF + 9.33

! 21 69 26 21 UTSF + 8.82 l 22 69 53 27 6TH TSP + 0.26 l 23 70 19 21 UTSF + 2.71 l 24 72 14 24 UTSF + 3.03 25 72 24 22 15TH TSP - 19.01 26 72 29 35 UTSF + 2.81 i j 27 72 56 23 UTSF + 4.75 l 28 72 57 27 UTSF + 5.42 l 29 73 51 30 UTSF + 6.55 l 30 75 44 21 UTSF + 2.78 31 77 57 33 UTSF + 5.34 32 78 37 24 UTSF + 7.77 33 79 7 32 8TH TSP + 0.62 34 79 53 26 UTSF + 6.09 35 79 63 33 UTSF + 2.93

Attachment to ICAN119306 Page 15 of18 TABLE 4 "B" OTSG TUBE DEGRADATION (20-39% TW INDICATIONS) l (Continued)

1. ROW TUBE %TW LOCATION 36 82 17 21 UTSF + 0.18 37 82 56 33 UTSF + 7.89 38 83 38 30 UTSF + 7.47 ,

39 83 48 22 UTSF + 4.64 40 85 19 27 UTSF + 18.53 41 85 21 24 UTSF + 11.38 42 87 25 25 UTSF + 6.17 43 88 15 24 UTSF + 12.22 ,

44 89 10 33 UTSF + 4.96 45 91 112 37 STH TSP + 6.91 46 96 8 29 UTSF + 5.63 i 47 96 17 36 13TH TSP + 24.07 48 98 9 39 UTSF + 5.02 49 104 2 38 UTSF + 3.25 {

50 110 39 30 2ND TSP + 6.86 51 111 20 33 LTSF + 2.18  !

52 117 4 22 UTSF + 4.66  !

53 123 5 28 13TH TSP + 29.40 l 54 123 8 23 UTSF + 8.36 i 55 126 23 25 UTSF + 15.77  ;

56 128 2 35 UTSF + 4.83 i LEGEND: UTSF - Upper Tubesheet Secondary Face LTSF - Lower Tubesheet Secondary Face  :

LTPF - Lower Tubesheet Primary Face ,

UTSF + X.X - Defect located X.X inches above the UTSF 12TH TSP + X.X - Defect located X.X inches above the 12th TSP l

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Attachment to ICAN119306 Page 16 ofI8 TABLE 5 "A" OTSG PREVENTIVE SLEEVE TUBES i

ROW TUBE ROW TUBE 1 64 1 40 79 10 2 65 3 41 79 12

? 65 4 42 80 4 j 4 66 4 43 80 6 l 5 66 5 44 80 9 6 67 2 45 81 1 7 67 4 46 81 6 ,

8 67 5 47 81 7  !

9 67 6 48 82 1  !

10 68 1 49 82 2 11 68 4 50 82 3 12 68 5 51 82 4 13 68 6 52 82 6 i 14 68 7 53 82 8

{

15 69 6 54 83 3  :

16 69 7 55 83 4 17 70 2 56 83 8 .

18 70 3 57 83 9 19 70 4 58 84 2 20 70 5 59 84 3 21 70 8 60 84 4 l

22 71 2 61 84 6  ;

23 71 3 62 84 7 24 71 4 63 85 3 25 75 36 64 85 4  !

26 78 13 65 85 5 27 78 15 66 85 6  ;

28 78 16 67 86 2 l 29 78 17 68 86 3 30 78 25 69 86 4 31 78 26 70 86 5 ,

32 78 27 71 87 3 l 33 78 28 72 88 1 34 78 29 73 88 2 35 79 1 74 88 4 l 36 79 2 75 89 1 37 79 4 76 89 2 38 79 8 39 79 9

Attachment to ICAN119306 Page 17 of18 l TABLE 6 l "A" OTSG PLUGS REPAIRED l

WITH REMOTE WELDED PLUGS l i

1. QTSG ROW TUBE PLUG TYPE [

1 A 6 51 EXPLOSIVE  ;

2 A 11 3 EXPLOSIVE 3 A 24 5 EXPLOSIVE l 4 A 24 35 EXPLOSIVE 5 A 31 17 EXPLOSIVE 6 A 32 95 EXPLOSIVE  ;

7 A 37 101 EXPLOSIVE l 8 A 37 97 EXPLOSIVE i 9 A 38 57 EXPLOSIVE i 10 A 38 103 EXPLOSIVE l I 11 A 39 15 EXPLOSIVE 12 A 42 1 EXPLOSIVE l 13 A 46 108 EXPLOSIVE [

14 A 49 111 EXPLOSIVE  !

15 A 64 103 EXPLOSIVE 16 A 74 87 EXPLOSIVE 17 A 77 27 EXPLOSIVE 18 A 77 18 EXPLOSIVE <

19 A 79 15 RIBBED / STAB.

20 A 80 1 EXPLOSIVE .

21 A 82 60 EXPLOSIVE i 22 A 87 81 EXPLOSIVE -

23 A 97 125 EXPLOSIVE 24 A 116 111 EXPLOSIVE 25 A 134 34 EXPLOSIVE  !

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ICAN119306 i Page 18 of18 i TABLE 7 "B" OTSG PLUGS REPAIRED WITH REMOH WELD'rD PLUGS -

1. OTSG ROW TUBE PLUG TYPE I B 25 10 RIBBED / STAB.

2 B 29 79 EXPLOSIVE -

3 B 31 101 EXPLOSIVE 4 B 32 31 RIBBED / STAB.

5 B 39 89 EXPLOSIVE 6 B 41 96 EXPLOSIVE 7 B 42 98 EXPLOSIVE 8 B 43 99 EXPLOSIVE 9 B 44 49 EXPLOSIVE 10 B 66 2 RIBBED / STAB.

I1 B 67 2 RIBBED / STAB.

12 B 68 2 RIBBED / STAB.

13 B 70 3 RIBBED / STAB.

14 B 70 25 RIBBED / STAB. '

15 B 72 30 RIBBED / STAB.

16 B 73 2 RIBBED / STAB.

17 B 73 9 EXPLOSIVE ,

18 B 74 4 RIBBED / STAB. '

19 B 77 2 RIBBED / STAB, 20 B 79 21 RIBBED / STAB.

21 B 80 7 RIBBED / STAB. '

22 B 80 10 RIBBED / STAB.

23 B 84 2 RIBBED / STAB.

24 B 89 54 EXPLOSIV8 25 B 92 117 EXPLOSIVE 26 B 95 2 RIBBED / STAB. ;

27 B 105 27 EXPLOSIVE  !

28 B 108 22 EXPLOSIVE 29 B 128 17 RIBBED / STAB.

30 B 138 37 EXPLOSIVE l

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