ML17219A387

Special Rept for Eddy Current Exam of Steam Generators Tubing During Apr 1986,St Lucie Unit 2 Nuclear Plant

ML17219A387
Person / Time
Site:	Saint Lucie
Issue date:	02/25/1987
From:	FLORIDA POWER & LIGHT CO.
To:
Shared Package
ML17219A385	List: ML17219A384 ML17219A387
References
NUDOCS 8703030280
Download: ML17219A387 (23)

Text

Florida Power R Light Company St. Lucie Unit II2 Nuclear Plant Special Report For EDDY CURRENT EXAMINATIONOF STEAM GENERATORS TUBING DURING APRIL, 1986 Nuclear Energy Services Materials, Codes and Inspections Department Juno Beach, Florida. 33008 Required by Plant Technical Specifications Sections 0.0.5.5 (b) and 6.9.2 8703030280'70225 PDR ADOCK 05000389 8

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Introduction Page 1 of 12 The Nuclear Energy

Services, Materials, Codes 2

Inspection Depar tment, conducted an inservice eddy current examination of the Florida Power R Light St.

Lucie Unit $/2 Steam Generator Tubing in April, 1986.

The extent of this examination included 100%

of non-plugged hot leg and cold leg tubes in accordance with plant technical specifications using multi-frequency eddy current equipment and differential bobbin coil test probes.

The eddy current data was subjected to two independent analyses using certified data analysts from Combustion Engineering, NDE Technology and Zetec, Inc. Discrepancies in the independent analyses were resolved by Level III individuals from the respective agencies.

St. Lucie Unit kj2 contains two Combustion Engineering series 67 recirculating steam generators identified as PSL-2A and PSL-2B.

Each steam generator contains approximately 8,011 u-bend tubes made of inconel 600.

A baseline eddy current examination was performed in 3uly, 1982 and the first inservice eddy current examination was performed in October, 1980.

An unscheduled inservice eddy current examination was last performed in March, 1985, due to primary to secondary tube leakage which was identified and attributed to flow induced vibrational wear at the diagonal and vertical support

straps, referred to as batwings (Figures 1 and 2).

To obtain wear progression

data, 29 tubes which were plugged in March, 1985 were de-plugged in April, 1986 and examined using a standard bobbin coil and a segmented bobbin coil probe.

The segmented bobbin coil probe provides wear data at both sides of the tube in contact with the batwing.

The results of this wear progression analyses is presented in Combustion Engineering report CEN-328 dated May, 1986.

Application of the wear progression model and conservative management practice during the April, 1986 outage resulted in "preventative maintenance plugging" of seven (7) additional tubes in PSL-2A and eight (8) additional tubes in PSL-2B.

Table 1

provides a summary by steam generator of tubes examined, indications of tube wall penetration and tubes plugged.

Table 2 provides a listing of tubes plugged as a result of the April, 1986 examination and application of wear progression models.

Refer to Figure 1 as a key to location codes.

A total of 18 tubes were plugged in the PSL-2A generator and 12 tubes were plugged in the PSL-2B generator.

All 18 tubes in PSL-2A were plugged as a result of wear at the batwing support straps.

In the PSL-2B, ten (10) tubes were plugged as a result of wear at the batwing support straps and two (2) tubes were plugged due to a small amplitude indication in the free span hot leg portion of each tube.

Table 3 provides a listing of all indications of tube wall penetration by location for each steam generator.

A summary of indications by "flaw range" is also included.

Table 0 contains a listing of indications located at the batwing areas which represent the initiation of tube wall damage from vibrational as discussed above.

However, the wear at these areas have not advanced to the point which will produce a measurable result in terms of wall penetration.

Therefore, these indications are identified as "Distorted Strap Signals" (DSS) and the affected tubes will be treated as degraded tubes and monitored during subsequent examinations or otherwise dispositioned.

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TABLE 1 St. Lucie Unit 82 Summar of Inservice Edd Current Examination Results for A ril 1986 Page 0 of 12 FSL-2A PSL-2B TOTAL TUBES EXAMINED 8229 8278 Indications of Wall Penetration Less than 20%

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Total IND/TUBES 50/08 30/30 11./11 919189 IND/TUBES 38/37 21/16 5/e 60 57 Tubes Plugged based on Wear Progression Analysis and Management Conservatism Tubes Plugged Which Exceeded Plugging Limits Total Tubes Plugged 12 Total Tubes Plugged To Date 200 105 MCll:0

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TABLE 2 St. Lucie Unit 2 Steam Generator Tubes Plu ed Durin the A ril 1986 Outa e Page 5 of 12 Line Row Steam Generator A Indication Location 60 70 76 76 77 79 80 81 83 83 83 97 97 100 101 102 118 100 88 00 50 52 09 59 50 09 09 55 57 39 09 30 33 06 90 32 68 01 05 22 30 00 31 33 27 00 25 29 08 01 09 07 06 65 V5 +15.1 DC DC DC DC DC DC DH DH V3 DC DH V3 V3 +.08 V3 V3 V0 DH Steam Generator B Line Row Indication Location MCII:0 26 28 82 89 89 90 91 91 110 119 131 153 72 96 50 07 131 06 03 09 96 97 61 63 38 57 05 38 31 30 35 39 25 03 38'0 56 08 28 27 26 20 V3 +.7 V2

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TABLE3 St. Lucie Unit 2 Examination Program April, 1986 Steam Generator PSL-2A List of all Tubes with Flaws Page 6 of 12 Line Row Indication Location 12 12 22 28 08 52 53 50 55 56 56 57 58 59 59 60 60 61 60 60 60 65 73 70 76 76 76 76 77 77 77 78 79 80 80 80 81 82 83 83 83 83 80 80 80 85 85MCllA 20 36 86 60 126 80 127 128 25 90 106 131 132 131 133

'88 130 131 90 130 136 133 07 00 02 50 52 96 07 09 51 00 59 08 50 50 09 132 09 53 55 57 06 50 50 07 07 20 20 28 20 30 20 20 20 20 32 20 20 20 22 23 68 31 27 28 26 20 20 25 01 23 05 22 30 29 30 20 23 00 20 31 22 33 20 27 20 00 25 20 20 20 20 20 OC + 7.60 6H + 28.50 V3 +.50 3C + 28.00 DH V3 DH DH V3 VO +.10 3C + 10.50 DH DH DH + 0.00 DH V3+ 15.10 DH DH V2 DH DH DH V3 DC + 0.00 DH DC DC 2H + 18.70 DC + 0.00 DH + 0.00 DH DH DC DC DC + 0.00 DC + 0.00 DH + 0.00 8H + 3.20 DH DC V3 DC + 0.00 DC + 0.00 DC DC DC DH

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TABLE 3 Page 7 of 12 St. Lucie Unit 2 Examination Program April, 1986 Steam Generator PSL-2A List of all Tubes with Flaws Line Row Indication Location 85 85 85 86 86 86 86 86 87 87 87 87 87 87 89 91 92 92 93 90 90 97 97 97 99 99 100 101 101 102 110 110 110 115 116 118 120 129 132 138 100 100 103 153 53 61 65 52 60 108 128 110 07 51 53 69 121 121 139 109 02 120 103 00 60 39 Q9 53 03 75 30 33 137 06 76 88 23 120 90 100 117 78 92 32 56 51 07 20 20 20 20 20 20 20 20 20 23 22 20 20 20 20 20 20 20 20 29 020 29 08 20 30 20 Ol 09 20 07 20 20 20 20 20 06 20 20 20 26 65 20 20 32 DC TSH + 6.10 1H + 16.00 DC + 0.00 DH 3C + 1.00 7H + 18.10 DC DC + 0.00 DC + 0.00 DC + 0.00 5C+ 8.80 TSC + 10.90 TSC + 12.70 DH TSC + 5.20 DH + 0.00 TSC + 26.20 2H 10.60 DH + 0.00 2C + 18.70 DH V3 OC + 28.50 OC + 11.30 OC + 12.60 V3 +.08 V3 DH V3 5H + 10.80 lc + 26.90 5C + 23.00 2C + 2.90 6H + 7.80 VO TSH + 5.80 TSH + 12.00 6C + 23.30 2H + 33.30 DH TSH 1H + 12.60 2H + 16.80 MCIIA

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TABLE 3 Page 8 of 12 St. Lucie Unit 2 Examination Program April, 1986 Steam Generator PSL-2A List of all Tubes with Flaws Flaw RANGE NUMBER OF NUMBER OF OCCURRENCES TUBES IN RANGE 0-19 20-29 30-39 00-09 50-59 60-69 70-79 80 - 89 90-99 50 22 8

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TABLE 3 Page 9 of 12 St. Lucie Unit 2 Examination Program April, 1986 Steam Generator PSL-2B List of all Tubes with Flaws Line Row Indication Location 26 28 28 33 35 38 02 05 50 51 53 50 57 65 68 68 77 78 79 80 80 80 80 81 82 82 83 85 86 88 89 89 90 90 90 91 91 97 100 100 101 100 100 108 108 72 96 96 07 75 96 90 35 116 57 59 2

63 131 32 130 03 08 07 06 08 52 50 07 06 5Q 89 07 52 06 07 131 06 130 130 03 09 97 60 136 33 52 56 80 82 38 57 05 20 20 28 20 20 20 20 20 20 20 20 20 20 20 20 20 22 20 22 20 20 20 38 26 21 20 26 31 30 35 20 20 39 25 20 22 20 20 20 20 20 20 V3 +.70 V2+ 1.10 V2 2C + 30.80 5H + 7.60 V0 5C + 16.30 2C 5H + 32.30 V3 3H+ 7.80 TSC + 6.60 2H + 3.90 9H + 17.30 DH 5H + 0.70 DC DC DH + 0.00 DH DC + 0.00 DH DH DH + 0.00 DH V3 Y3 +.80 DC DC V3 DH 5H + 20.60 DC 1C + 11.60 1C + 3.50 DH DC TSH + 21.00 DH TSC + 15.90 DC OC + 26.50 OH + 26.00 TSH + 3.00 TSH

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TABLE 3 Page 10 of 12 St. Lucie Unit 2 Examination Program April, 1986 Steam Generator PSL-2B List of all Tubes with Flaws Line Row Indication Location 110 110 110 111 110 116 116 119 120 125 130 131 133 136 153 153 153 153 159 96 96 96 119 96 52 112 97 108 71 90 61 17 108 63 63 63 63 53 03 38 20 20 20 20 20 56 20 20 20 08 20 20 28 27 26 20 20 V2 V3 V2 +.60 6H + 28.90 V2 TSC + 11.50 6C + 10.70 V3 + 10.70 3C + 13.30 8C V2 1H + 8.00 TSH + 2.00 1C + 31.00 V2+ 8.50 V2+ 5.60 V2 + 10.00 V2 + 12.70 5C + 17.20 Flaw RANGE NUMBER OF NUMBER OF OCCURRENCES TUBES IN RANGE 0-19 20 -29 30 -39 00-09 50- 59 60- 69 70 - 79 80 - 89 90-99 38 10 7

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TABLE 0 Page 1 1 of 12 St. Lucie Unit 2 Examination Program - April, 1986 Steam Generator PSL-2A Tubes with Distorted Support Strap (DSS) Indications Line Row Indication Location 27 27 07 07 50 50 50 52 57 58 59 59 59 61 63 60 66 66 70 73 78 79 86 90 96 96 98 119 129 131 131 93 93ill 111 120 120 126 78 95 90 93 95 127 83 133 128 90 120 136 135 96 09 92 90 00 50 130 51 87 07 93 DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS VO VO V0 V3 V2 Vl Vl V0 V2 +.80 V2 VO V3 Vl +.80 V3 +.60 Vl Vl +.90 V0 V5 Vl Vl V3 V3 +.50 VO V3 V3 V3 V3 V3 V3 V3 V2 MCII:0

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TABLE 0 Page 12 of 12 St. Lucie Unit 2 Examination Program April, 1986 Steam Generator PSL-2B Tubes with Distorted Support Strap (DSS) Indications Line Row Indication Location 25 26 30 38 69 87 88 88 91 92 98 99 100 102 100 110 111ill 117 123 103 89 72 96 96 133 09 52 56 05 50 30 37 92 30 00 96 89 93 89 97 95 DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS DSS V2 V2 +.80 V2 V2 Vl +.90 V3 V3 V3 V3 V3 V3 V3 V2 V3 V3 V3 +.70 VO V2 V2 V3 V2 MCIIA

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