ML20058A062
| ML20058A062 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 11/16/1993 |
| From: | William Cahill, Woodlan D TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| TXX-93389, NUDOCS 9311300071 | |
| Download: ML20058A062 (2) | |
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Log # TXX 93389
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C Ref. # 10CFR50.55a 1UELECTRIC November 16, 1993
% IHLem J. Cahill, Jr.
Grosop Von Ihnadent U. S. Nuclear Regulatory Commission Attention:
Document Control Desk Washington, DC 20555
SUBJECT:
COMANCHE PEAK STEAM ELECTRIC STATION (CPSES) - UNIT 1 DOCKET NO. 50-445 SPECIAL REPORT ON THE UNIT 1. THIRD REFUELING OUTAGE, STEAM GENERATOR INSERVICE INSPECTION TUBE PLUGGING AND
SUMMARY
REPORT Gentlemen:
This letter provides the Inservice Inspection (151) Special Report on the steam generator tube 151 for Comanche Peak Steam Electric Station's third refueling outage on Unit 1.
This report is being provided to you pursuant to CPSES Unit 1 Technical Specificaticns 4.0.6.Sa. 4.0.6.5b and 6.9.2.
Full length examinations of 3686 steam generator tubes-in. steam generators 1 and 4 were performed using multi-frequency bobbin coil techniques.
This represents 20.2% of the active (non-plugged) tubes it, the four steam generators.
This sample included all tubes in these two steam generators with previously detected indications.
Additionally, five tubes were examined using rotating pancake coil (RPC) methodology to assist in characterizing distorted support plate signals.
None of the distorted signals were confirmed using RPC methodology.
The following table identifies the number of' tubes examined, tubes where indications exist, and the thru-wall percentage of those indications.
- Tubes Examined Row / Column /% Thru-Wall 1
1838 40/18/15 49/36/37 9/59/35 49/67/38 11/82/7 I
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TXX-93389 Page 2 of 2 Steam Generator
- Tubes Examined Rgglfolumn/% Thru-Wall 4
1848 4/4/32 45/41/23 33/60/19 4/87/12 39/95/35 7/107/14 As indicated by the above table, no tubes exceeded the 40% thra-wall plugging limit and therefore no tubes were plugged.
If there are any questions, please call Mr. Carl Corbin at (214) 812-885'.
Sinc 'ely, William J. Cahill. Jr.
By-D. R. Woodlan Docket Licensing Manager CBC/grp c-Mr. J. L. Milhoan, Region IV Mr. L. A. Yandell, Region IV Resident Inspectors. LPSES (2)
Mr. T. A. Bergman, NRR Mr. G. Bynog Director and Chief Inspector Texas Department of' Licensing and Regulation Boiler Division E.0. Thompson State Office Building P. O. Box 12157. Capital Station Austin. Texas 78701 l
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