LIC-95-0138, SG Eddy Current Test Rept,1995 Refueling Outage
ML20086N631 | |
Person / Time | |
---|---|
Site: | Fort Calhoun ![]() |
Issue date: | 03/31/1995 |
From: | Tira Patterson OMAHA PUBLIC POWER DISTRICT |
To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
References | |
LIC-95-0138, LIC-95-138, NUDOCS 9507250274 | |
Download: ML20086N631 (18) | |
Text
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July 18,1995 l LIC-95-0138 i U. S. Nuclear Regulatory Commission Attn: Document Control Desk Mail Station P1-137 Washington, DC 20555 l
Reference:
Docket No. 50-285
SUBJECT:
Fort Calhoun Station (FCS) Steam Generator Eddy Current Test Report - 1995 Refueling Outage j Attached is the FCS Steam Generator Eddy Current Test Report which summarizes testing performed during the Spring 1995 Refueling Outage. This submittal '
fulfills the reporting requirements of FCS Technical Specifications Section 3.17 (5) (ii) .
If you should have any questions, please contact me.
Sincerely, T. L. Patterson Division Manager :
Nuclear Operations TLP/dll Attachment c: Winston & Strawn (w/o attachment)
L. J. Callan, NRC Regional Administrator, Region IV T. Y. Liu, NRC Acting Project Manager i W. C. Walker, NRC Senior Resident Inspector 250106 '
05 5124 Employment with Equal opparm , t 9507250274 950331
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PDR ADOCK 05000285 \
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- LIC-95-0138
',~ Attachment Page 1 FORT CALHOUN STATION STEAM GENERATOR EDDY CURRENT TEST REPORT 1995 REFUELING OUTAGE INTRODUCTION This report summarizes steam generator eddy current results obtained during the i Fort Calhoun Station (FCS) 1995 Refueling Outage. Summaries of results of the two previous eddy current inspections were submitted to the NRC in the following documents:
- Fort Calhoun Station Steam Generator Eddy Current Test Report - 1992 Refueling Outage, dated August 31, 1992 (LIC-92-288R)
- Fort Calhoun Station Steam Generator Eddy Current Test Report - 1993 '
Refueling Outage, dated March 18, 1994 (LIC-94-0056)
DESCRIPTION OF EXAMINATION ABB/ Combustion Engineering conducted an inservice eddy current examination of the steam generator tubes at FCS in March 1995. The examination program was conducted to meet the requirement of Technical Specification Section 3.17. The examination included multi-frequency testing for indications of degradation and dents in Steam Generators A and B.
1 The test program included:
- 1. Full length bobbin coil testing of 1814 tubes (36%) in Steam Generator A and 1258 tubes (25%) in Steam Generator B (see Figures 1 and 2). This testing included:
. An augmented sample of 268 tubes in Steam Generator A and 333 tubes in Steam Generator B. The augmented sample included all tubes l identified as degraded tubes (i.e., t 20% wall loss) and one tube adjacent to each of these. Tubes in the areas of the steam generators where experience has indicated potential problems were also inspected.
- A random sample of 20% of the remaining tubes, or 936 tubes in Steam Generator A and 923 tabes in Steam Generator B.
- A scope expansion of 606 tubes in Steam Generator A due to this steam generator being classified in Category C-2 (per Technical Specification 3.17) after the initial sample.
The addition of four (4) tubes in Steam Generator A and two (2) tubes in Steam Generator B. These tubes were added to fulfill the requirement for testing tubes adjacent to newly-identified degraded l tubes.
LIC-95-0138 Attachment Page 2
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- 2. Motorized Rotating Pancake Coil (MRPC) testing of the top of the hot leg tubesheet of 1929 tubes (39%) in Steam Generator A and 2081 tubes (42%) in Steam Generator B (see Figures 3 and 4).
- 3. MRPC testing in the hot leg U-bends and dented support plate intersections ,
of 19 tubes in Steam Generator A (see Figure 5). l-
- 4. MRPC testing of previous overexpansion indications at the top.of the cold leg tubesheet for a total of 4 tubes in Steam Generator B (see Figure 6). ,
The tubes in the bobbin coil inspection plan were examined at full length. The inspection patterns are shown on Figures 1 and 2. Support notation for each steam generator is shown in Figure 7. Tubes previously determined ' to have deformation sufficient to restrict the passage of the 0.560" diameter probe were inspected using a 0.540" diameter probe to identify the presence of tube wall degradation or other restrictions.
Tube wall degradation was evaluated using the phase analysis technique for detennination of the origin and percentage of tube wall loss represented by the -
indication. The data were independently analyzed by two groups of certified Level IIA or Level III data analysts. Any discrepancies between the two sets of evaluation results were reviewed and resolved by a Lead Level III Eddy Current Examiner.
The examination was conducted with a Zetec MIZ-18A digital eddy current i acquisition system and analyzed utilizing the Eddynet digital analysis system.
The frequencies utilized during the bobbin coil examination were as follows: l 400 KHz differential and absolute 100 KHz differential and absolute l 600 KHz differential and absolute i 10 KHz differential and absolute ]
400/100 KHz differential mix The primary frequency of 400 KHz satisfies the requirements of the American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code for the examination of nonferromagnetic steam generator tubes. The 400 KHz absolute is used to measure the radial dent size. The 100 KHz frequency-is provided.to assist in the confirmation of flaw indications. The 100 KHz absolute detects gradual wall thickness variations. The 600 KHz frequency is provided to assist the analysts with additional mixing capabilities in the event of excessive outside diameter (0D) tube deposits. The 10 KHz frequency is provided to facilitate locating the probe position in the steam generator. The 400/100 KHz mix is used to eliminate the tube support and OD tube deposit signals. Other mixes are performed as required by the data analyst.
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- LIC-95-0138
', Attachment Page 3 l
The tubes in the Top of Tubesheet MRPC Program were inspected in the hot leg expansion transition region of each steam generator. The inspection patterns are shown in Figures 3 and 4. The data were analyzed for the presence of crack-like indications similar to those found in the expansion transition regions at other plants. Terrain plots were used during the analysis effort to improve the i probability of detecting circumferential cracks.
i The MRPC exams performed at U-bends and at dents in Steam Generator A, as well i as the MRPC exams on overexpansion indications at the top of the tubesheet in Steam Generator B were performed to confirm bobbin coil results which show no active stress corrosion cracking in the FCS Steam Generators. The inspection patterns are shown in Figures 5 and 6. !
RESLLTS PT THE EXAMINATION Defect Examination:
One tube in Steam Generator A, Row 42, Line 73, was identified as containing a 43% through-wall defect. The indication is located 7.9 inches above the tubesheet on the cold leg side and was confirmed to be a pit with MRPC.
There were no other tubes in either steam generator identified as containing degradation >40%. Additionally, no crack-like indications were found in the hot leg expansion transition region or any other location of either steam generator during performance of the MRPC exams.
A list of indications and their locations is provided in Table 1. Table 2 provides information regarding the plugged tube as a result of this inspection.
t Dent Examination: >
The 400 KHz absolute data from the bobbin coil exams were used to evaluate average radial dents for a sample of the most severely dented tubes in the steam generators. Although the bobbin coil probe is not extremely accurate in determining actual dent size, it can be used as an indicator of change. Results of the bobbin coil dent. measurements indicate that there has been virtually no l increase in the overall average size of the dents in either steam generator since '
the last inspection.
Tubes determined to have deformation sufficient to restrict the passage of the 0.560" diameter probe in past inspections were reinspected with a 0.540" diameter probe to determine the presence of tube wall degradation or the presence of other restrictions in the entire length of the tube. During the 1995 examination, there were no new tubes that restricted passage of a 0.560" diameter probe due to denting, and no tubes that restricted passage of a 0.540" diameter probe. 1 l
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'LIC-95-0138 ;
'. Attachment 1 Page 4 i l
CONCLUSIONS One tube required plugging in Steam Generator A during the 1995 Refueling Outage because it contained a defect which exceeded the 40% through-wall plugging criteria as defined in Technical Specification 3.17. MRPC testing confirmed the existence of the defect and showed it to be volumetric rather than crack-like in nature. There are currently 56 tubes plugged (1.1%) in Steam Generator A and 55 tubes plugged (1.1%) in Steam Generator B. The number of indications below the 40% plugging limit increased over that found during the previous inspection. It is concluded, however, that many of these indications are being found primarily due to a heightened sensitivity of the analysts in the evaluation and documentation of small amplitude indications rather than the onset of significant !
further degradation. This is supported by the fact that comparisons of the known i indications between the 1993 and 1995 inspections generally show little change.
No cracks were found in the expansion transition region or any other region of either steam generator during performance of the MRPC exams.
The results of bobbin coil dent measurements indicate virtually no dent growth since the last outage. This conclusion is further supported by the fact that no new tubes restricted passage of the 0.560" diameter probe due to denting, and no tubes restricted passage of the 0.540" diameter probe. j l
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'LIC-95-0138 Attachment TABLE 1 Page 5 LIST OF INDICATIONS Steam Generator RC-2A Indications Row /Line %tw location Row /Line %tw location 6/47 6 HTS + 0.9 in. 41R4 3 HTS + 1.5 in.
8/125 29 H1 + 2.7 in. 41/96 12 HTS + 3.5 in.
8/125 15 CTS + 3.4 in. 42/25 18 HTS + 1.4 in.
8/125 15 H1 + 0.5 in. 42/71 11 HTS + 0.9 in.
8/125 12 HTS + 4.0 in. 42H3 43 CTS + 7.9 in.
8/125 7 HTS + 23.6 in. 4293 25 HT3 + 6.6 in.
11/64 17 HTS + 1.8 in. 44/9 16 HTS + 0.8 in.
12/53 2 CTS + 2.3 in. 44/15 3 HTS + 1.4 in.
18/95 19 HTS + 1.3 in. 44/15 3 HTS + 0.7 in.
20/23 11 H1 + 28.5 in. 44/23 5 HTS + 1.1 in.
20R7 8 HTS + 0.6 in. 45/86 10 HTS + 4.7 in.
21/40 11 CTS + 8.8 in. 46/45 19 HTS + 3.3 in.
l 22/67 19 HTS + 0.8 in. 46/87 17 H6 + 26.0 in.
22/95 8 HTS + 3.8 in. 46/87 3 HTS + 2.0 in.
22/101 19 CTS + 36.7 in. 47/46 13 HTS + 2.5 in.
23/36 7 HTS + 3.7 in. 47/48 12 HTS + 4.7 in.
27/104 18 HTS + 2.3 in. 47/66 7 DBH + 5.2 in.
28/41 3 HTS + 3.4 in. 47/90 4 HTS + 3.6 in.
29/38 12 HTS + 3.3 in. 47/96 13 H4 + 32.2 in.
29/38 3 HTS + 6.5 in. 48/53 19 HTS + 5.0 in.
29/40 34 HTS + 5.5 in. 49/68 6 HTS + 4.4 in.
29/64 6 HTS + 3.8 in. 49/68 4 HTS + 3.3 in.
2990 24 HTS + 4.3 in. 49/78 20 HTS + 3.8 in.
31/40 2 HTS + 5.9 in. 51/90 16 HTS + 3.5 in.
31/42 8 HTS + 1.5 in. 53/64 15 HTS + 4.2 in.
31/68 5 HTS + 6.3 in. 54/65 24 HTS + 3.6 in.
33/40 17 HTS + 3.6 in. 54n5 3 HTS + 5.0 in.
33/40 3 HTS + 3.3 in. 55/98 4 HTS + 0.8 in.
35/50 24 HTS + 1.9 in. 56/47 17 HTS + 1.8 in.
35/50 18 HTS + 1.0 in. 56/51 19 H7 + 12.2 in.
35/50 7 HTS + 1.3 in. 5609 16 HTS + 3.5 in.
36/61 11 HTS + 7.9 in. 56/95 4 HTS + 1.2 in.
37/40 9 HTS + 3.3 in. 57/36 6 H3 + 23.0 in.
37/56 1 HTS + 5.1 in. 57/80 15 HTS + 2.5 in.
38/63 6 HTS + 7.0 in. 58/81 19 HTS + 3.7 in.
3897 1 HTS + 1.0 in. 59/64 8 HTS + 3.3 in.
39/44 27 HTS + 4.2 in. 59/66 9 HTS + 3.7 in. i 39/52 16 HTS + 2.0 in. 5960 17 HTS + 1.3 in. j 39/68 11 HTS + 8.4 in. 6095 17 HTS + 2.1 in.
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40/77 18 HTS + 0.6 in. 61/78 10 C4 + 24.4 in.
40/85 9 HTS + 4.0 in. 62/67 13 HTS + 3.0 in.
41/20 22 H6 + 25.9 in. 62H1 12 HTS + 3.9 in.
41/64 17 HTS + 1.0 in. 64R7 8 V1 + 7.8 in.
4190 14 HTS + 1.3 in. 66/25 13 H3 + 13.6 in.
4160 14 HTS + 7.3 in. 66/37 8 H4 + 16.7 in.
4160 9 HTS + 5.9 in. 66/41 10 HTS + 1.1 in.
4194 37 HTS + 1.2 in. 67/24 6 H2 + 36.1 in.
'LIC-95-0138
$ Attachment TABLE 1 Page 6 LIST OF INDICATIONS Steam Generator RC-2A Indications Row /Line %tw location Row /Line %tw location 67/26 4 H3 + 18.1 in. 83/74 13 H3 + 15.6 in.
67/38 24 H2 + 23.1 in. 83/82 36 H4 + 1.8 in.
67/38 23 H3 + 4.2 in. 83/82 15 H4 + 9.4 in.
67/40 17 H4 + 6.5in. 85/58 8 H2 + 19.1 in.
68/99 2 H7 + 19.5 in. 87/40 9 CTS + 35.3 in.
69/30 19 HS + 28.8 in. 88/41 19 H2 + 31.8 in.
70/87 13 HS + 24.1 in. 89/56 4 H8 + 1.0 in.
73/80 2 HTS + 0.8 in. 90/57 5 HB + 1.1 in.
74/91 16 H3 + 13.2 in. 90/91 11 DBH + 7.8 in.
75/80 15 HTS + 0.9 in. 92/45 23 H2 + 27.8 in.
76/25 18 CTS + 1.6 in. 93/66 17 H7 + 4.2 in. !
77/80 9 HTS + 0.7 in. 93/66 12 H7 + 5.2 in. l 77/104 1 H8 + 8.7 in. 93/66 2 H7 + 3.7 in.
78/87 16 H3 + 26.2 in. 94/43 12 HTS + 2.4 in.
78/87 13 H4 + 17.9 in. 99/74 23 H1 + 30.5 in.
78/87 10 H3 + 21.7 in. 99/74 21 H1 + 1.8 in. I 78/103 24 HTS + 25.4 in. 95/74 16 H4 + 11.8 in. l 82/95 8 H2 + 29.7 in. l l
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LIC-95-0138
. Attachment TABLE 1 Page 7 LIST OF INDICATIONS Steam Generator RC-28 fr dications Row /Line %tw location Row /Line %tw location 5/112 5 H2 + 12.8 in. 32R7 22 CTS + 26.4 in.
5/114 19 H2 + 7.6 in. 33/46 13 HTS + 5.6 in.
5/114 9 H2 + 6.4 in. 33/104 6 HTS + 0.8 in.
7/42 12 H1 + 9.8 in. 34/85 12 H3 + 10.7 in.
8/115 11 H2 + 9.6 in. 34/101 24 H3 + 30.1 in.
8/115 11 H2 + 11.6 in. 35/22 14 HTS + 1.4 in.
9/122 7 H2 + 5.7 in. 36/49 13 HTS + 1.3 in.
15/56 16 H1 - 0.9 in. 36/77 5 HTS + 7.1 in.
15/100 10 HTS + 5.1 in. 36/77 4 HTS + 9.8 in. I 15/110 15 HTS + 1.0 in. 3699 6 HTS + 0.9 in. l 20/103 9 HTS + 3.0 in. 37/38 18 HTS + 9.8 in. l 21/102 14 HTS + 37.8 in. 37/38 12 HTS + 3.7 in. l 21/110 7 HTS + 0.6 in. 38/63 5 HTS + 6.3 in.
24/19 11 HTS + 1.7 in. 38/67 14 HTS + 5.5 in. ;
25/18 31 HTS + 1.8 in. 39/48 19 HTS + 1.0 in. '
25/62 10 H2 - 0.6 in. 39/102 1 HTS + 1.1 in. I 25/80 19 HTS + 3.8 in. 4093 11 HTS + 8.4 in. j 27/46 ,21 HTS + 9.3 in. 40R3 8 CTS + 7.2 in. I 27/86 14 HTS + 0.7 in. 40/73 3 HTS + 1.5 in. i 28/81 4 HTS + 5.4 in. 40/83 8 HTS + 5.9 in. l 28/97 19 H2 + 23.7 in. 41/108 5 H2 + 6.7 in. l 28/97 11 H3 + 22.1 in. 44/77 10 HTS + 15.7 in.
28/97 6 H2 + 28.1 in. 44/101 13 HTS + 0.9 in. I 28/97 5 H3 + 25.4 in. 45/10 3 HTS + 35.1 in.
28/97 3 H3 + 18.9 in. 45/38 9 HTS + 1.9 in.
28/97 3 H2 + 29.5 in. 45/50 7 HTS + 4.0 in.
28/97 1 H3 + 27.8 in. 46/45 3 H4 + 2.1 in.
28/101 17 H3 + 29.1 in. 46/51 5 HTS + 4.2 in.
28/101 6 H3 + 24.0 in. 46/53 8 HTS + 3.4 in. i 28/101 6 H3 + 28.7 in. 46/67 13 HTS + 4.1 in. l 28/101 5 H3 + 8.4 in. 46/67 9 HTS + 5.1 in.
28/101 4 H3 + 29.9 in. 46/79 17 HTS + 5.1 in.
29/36 23 HTS + 4.0 in. 46/79 16 HTS + 4.4 in.
29/80 18 HTS + 13.3 in. 4699 6 HTS + 3.1 in.
30/43 2 H6 + 3.3 in. 46/83 17 HTS + 5.0 in. q 30/45 6 H6 + 6.6 in. 46/87 10 H5 + 4.2 in. !
30/103 24 H3 + 8.1 in. 46/87 7 H4 + 15.0 in. l 30/103 15 H3 + 3.6 in. 47/7; 9 HTS + 2.8 in. l 30/103 14 H3 + 11.1 in. 47H4 6 HTS + 5.3 in.
30/103 8 H2 + 20.1 in. 47/74 6 HTS + 3.5 in. l 30/103 8 H3 + 2.2 in. 4768 9 HTS + 3.5 in. I 31/52 18 HTS + 4.6 in. 47/78 1 HTS + 2.8 in.
31/52 9 H6 + 5.9 in. 47/80 14 HTS + 2.3 in. .
31/84 5 HTS + 3.8 in. 47/80 7 HTS + 4.4 in.
31/84 3 HTS + 7.4 in. 47/80 6 HTS + 3.1 in.
31/88 12 HTS + 2.8 in. 48/69 19 HTS + 17.0 in.
31/88 10 HTS + 3.1 in. 48/69 13 HTS + 2.3 in.
LIC-95-0138- 1 Attachment TABLE 1 Page 8 LIST OF INDICATIONS Steam Generator RC 2B Indications Row /Line %tw location Row /Line %tw location l 48/69 8 HTS + 3.2 in. 60/51 6 C2 + 0.1 in.
48/69 8 HTS + 3.0 in.
61/44 f5 H3 + 19.1 in.
48/69 5 HTS + 4.5 in. 61/44 9 H3 + 26.9 in.
48U1 10 HTS + 6.2 in. 61/44 7 - H3 + 18.2 in. '
4801 7 HTS + 4.4 in. 61/44 3 H4 + 19.8 in.
48/71 6 HTS + 2.7 in. 61/44 3 H3 + 19.5 in.
48n3 11 HTS + 2.5 in. 63/80 13 H3 + 13.1 in.
48/83 15 HTS + 1.6 in. 63/112 12 H3 + 9.5 in.
48/85 3 H2 + 23.9 in. 63/112 3 H4 + 15.6 in. 4 48/85 2 H2 + 38.2 in. 64/57 19 C3 + 4.9 in.
49/44 26 HTS + 2.5 in. 65/32 9 H2 + 28.4 in. J 49/54 12 HTS + 3.2 in. 66/55 6 HTS + 2.7 in.
49/68 8 HTS + 5.6 in. 67/24 1 V3 + 6.0 in.
49/70 15 HTS + 5.0 in. 67/28 '15 CTS + 8.3 in.
49/78 19 HTS + 5.0 in. 67/42 14 HTS + 2.4 in.
50/63 7 HTS + 4.1 in. 67R0 9 H3 + 18.7 in. l 50/65 5 HTS + 22.1 in. 67/88 8 H2 + 33.3 in.
50/67 5 HTS + 4.3 in. 69/36 23 HTS + 1.0 in.
5063 9 HTS + 2.0 in. 69/68 19 H3 + 6.2 in.
50/83 6 HTS + 2.2 in. 69/68 16 C7 + 2.2 in.
50/83 5 H3 + 10.1 in. 69/68 6 H3 + 10.4 in.
51/66 9 HTS + 3.7 in. 69/68 2 HTS + 36.3 in.
51/66 7 HTS + 2.7 in. 6992 26 V3 + 9.1 in.
51/68 19 HTS + 5.6 in. 6992 15 H3 + 27.9 in.
51/68 4 HTS + 3.5 in. 69/72 6 H3 + 29.1 in.
51/90 7 HTS + 3.2 in. 6992 5 H3 + 25.1 in.
52/67 13 HTS + 3.6 in. 69/72 1 H3 + 30.2 in.
52/69 13 HTS + 2.3 in. 70/83 13 H2 + 0.4 in.
52/69 13 HTS + 3.1 in. 70/83 12 HTS + 1.4 in.
54/65 13 HTS + 19.7 in. 71/96 1 H6 + 1.2 in.
55/62 10 HTS + 2.4 in. 72/29 16 H7 + 23.2 in.
55/64 20 HTS + 14.5 in. 72/45 13 H2 + 9.9 in.
55/98 8 HTS + 1.1 in. 73/86 4 H2 + 32.6 in.
56/51 18 HTS + 3.2 in. 74/69 11 CTS + 1.1 in.
56/51 1 HTS + 2.9 in. 74/69 10 HTS + 27.9 in.
56/73 17 HTS + 1.9 in. 74U1 15 H3 + 32.7 in.
5693 13 HTS + 5.1 in. 74R7 15 HTS + 1.5 in.
~
57/24 18 HTS + 18.2 in. 74/79 15 H2 + 35.2 in.'
57/24 7 H2 + 31.9 in. 7469 14 H3 + 11.2 in.
57/62 27 C1 + 15.0 in. 75/66 6- HTS + 1.5 in.
57/62 11 HTS + 3.6 in. 75/68. 5 HTS + 1.8 in.
59/32 15 H3 + 14.9 in. 75/84 7 CTS + 1.8 in.
59/32 13 H7 + 1.8 in. 76/51 19 HTS + 1.5 in.
59/32 7 H3 + 15.8 in. 78/35 3 C2 + 20.0 in.
59/50 22 HTS + 3.8 in. 78/49 16 H3 + 16.2 in.
5990 8 HTS + 3.5 in. 78/49 16 H2 + 19.3 in.
60/45 9 HTS + 3.3 in. 78/79 _ 11 CTS + 12.7 in.
LIC-95-0138 TABLE 1 Attachment Page 9- LIST OF INDICATIONS Steam Generator RC-28 Indications Row /Line %tw location Row /Line %tw location 78/79 4 H3 + 3.2 in. 84/45 17 H2 + 29.3 in.
79/70 11 HTS + 1.2 in. 84/55 12 HTS + 0.6 in.
79/80 8 H2 + 12.9 in. 84/61 3 H3 + 2.8 in.
79/80 8 H3 + 25.9 in. 87/30 17 V1 + 15.3 in.
81/76 15 HTS + 1.5 in. 88/53 10 C4 + 2.8 in.
81/76 12 HTS + 3.1 in. 88/63 15 H1 + 3.7 in.
81/80 22 HTS + 4.9 in. 88/63 5 H1 + 2.6 in.
81/88 2 H3 + 1.9 in. 88/63 2 H1 + 3.1 in.
82/73 16 HTS + 2.3 in. 88/83 19 H7 + 2.8 in.
83/76 5 C3 + 22.7 in. 88/83 8 H7 + 3.0 in.
84/27 30 CTS + 0.3 in. 89/56 15 HTS + 5.5 in.
84/33 18 C3 + 22.7 in. 99/76 14 H2 + 34.1 in.
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LIC-95-0138'
' Attachment Page 10 -
TABLE 2
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' LIST OF TUBES PLUGGED'-
DURING 1995 REFUELING OUTAGE STEAM GENERATOR RC-2A Row /Line %tw location 42/73 43% CTS + 7.9" STEAM GENERATOR RC-2B No tubes plugged
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