ML19331A483
| ML19331A483 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 03/14/1977 |
| From: | Renfrow R ISHAM, LINCOLN & BEALE |
| To: | Coufal F, Leeds J, Luebke E Atomic Safety and Licensing Board Panel |
| References | |
| NUDOCS 8007170743 | |
| Download: ML19331A483 (2) | |
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SEVENTM FLOOR March 14, 1977
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Dr. J. Venn Leeds, Jr.
Dr. Emmeth A. Luebke 10807 Atwell Atomic Safety & Licensing Houston, Texas 77096 Board Panel U.S. Nuclear Regulatory Commission Washington D.C.
20555 Frederic J. Coufal, Esq., Chairman Atomic Safety & Licensing Board Panel U.S. Nuclear Regulatory Commission Washington D.C.
20555 RE:
Midland Proceeding - Liner Plate Gentlemen:
This letter will inform the Board and the parties of an incident at the Midland site which will affect the cost for constructing that facility.
Late on Saturday, February 26, 1977, a worker discovered that a portion of the liner plate on Containment Building #2 had bulged, and that water was leaking through I
several spots in the plate.
The NRC, Region III Inspection and Enforcement Division was notified on Monday, February 28, 1977, and they inspected the liner plate that evening.
The affected section of liner plate is located at approximately 260 degrees azimuth and consists of a maximum bulge in one area of approximately 3 feet and in other areas of lesser sizes.
The size of the area af(ected is approxi-mately 20 feet horizontal by approxhnately 90 feet vertical.
Scme surface spalling of concrete had occurred where the vertical strengthening angles attached to the back of the liner plate have pulled away from the horizontal steel channels which are embedded in the concrete wall.
The preliminary analysis indicates that the bulge in the liner plate was caused by an accumulation of water between the liner plate and the concrete, causing a buildup of water pressure.
At the present time, it is postulated that the source of the water was the 2" construction water 8007170 7El3 g
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Page Two Letter to Board March 14, 1977 line which is embedded in the exterior wall of the contain-ment approximately 12" from the liner plate.
This analysis will be confirmed when the liner plate is removed.
The water line was installed to provide a source of water for curing concrete and cleaning the interface joints between the lifts of concrete as they are poured.
While it is normal construction practice to install and use such a line, this practice has been discontinued, and the water line currently installed has been disconnected.
No further water lines will be placed in the containment wall.
The damaged sections of the liner plate will be removed starting at the top of the affected area.
New sections of liner plate will be fabricated and installed to meet the original design criteria.
Based on our pre-l liminary analysis, the cost for engineering, materials and installation could range from $800,000 to $2,300,'000.
While Consumers Power carries insurance to cover losses resulting from incidents such as this, no decision can be made on whether this event will be covered until the liner plate is removed and the cause is determined.
The liner plate damage will not affect the schedule for initial. fuel loading.
As more information becomes available, I will provide it to the Board and the parties.
Very truly yourliD,
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