ML20244E515
| ML20244E515 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 06/13/1989 |
| From: | Scace S NORTHEAST NUCLEAR ENERGY CO., NORTHEAST UTILITIES |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| MP-13197, NUDOCS 8906200377 | |
| Download: ML20244E515 (2) | |
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HARTFORD. CONNECTICUT 06141-0270 k
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20555 Gentlemen:
Millstone Nuclear Power Station, Unit 3 STEAM GENERATOR TUBE PLUGGING This special report is being submitted within 15 days pursuant to Millstone Unit 3 Technical Specification Section 4.4.5.5.a.
Plant Technical Specification 4.4.5.5.a requires a special report be submitted to the NRC following the completion of each inservice inspection of steam generator tubes and the number of tubes plugged in each steam generator.
The end-of-Cycle 2 ECT inspection was completed on May 29, 1989. Table 1 sumarizes the results. A total of 5033 tubes (22 percent of the total) were inspected in two of the four SGs.
Three tubes were identified as having flaws in excess of the technical specification plugging limit of 40 percent throughwall.
The flaws were located adjacent to antivibration bars. These tubes were plugged (SG A R48/C97, SG a R50/C26, SG A R50/C95).
In addition, another tube (SG A R1/Cl22) was plugged on a discretionary basis due to the presence of a distorted ECT signal.
The complete results of the steam generator tube inservice inspection will be submitted within 12 months in accordance with Plant Technical Specification 4.4.5.5.b.
The licensee contact for this special report is Larry Loomis who may be reached at (203) 444-5468.
Very truly yours, NORTHEAST NUCLEAR ENERGY COMPANY 1
axc-Step n E. Scace Station Superintendent Millstone Nuclear Power Station SES/LEL:d1r Attachment ec: D. H. Jaffe, NRC Project Manager, Millstone tinit No. 3 i
W. T. Russell, Region I i
W. J. Raymond, Senior Resident Inspector W. D. Romberg, Berlin E. J. Mroczka, Berlin 8906200377 890613
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TABLE 1 o
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1 MILLSTONE POINT, UNIT 3-j; 1989 EDDY' CURRENT INSPECTION'
SUMMARY
,.4 TOTAL
' SG D
. TOTAL TUBES 22,504 5,626 5,626
-5,626 5,626
. TUBES INSPECTED' 5,033 2,553
- 0 2,480-0
. TUBES WITH MAXIMUM 3
3 0
0 0-l'
' FLAW 240 PERCENT '
TUBES WITH MAXIMUM 25 22 0-3 0
FLAW <40 BUT 220 PERCENT TUBES PLUGGED AS'A RESULT 4
4 0
0 0-OF THIS INSPECTION' I
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