ML20011A658

Significant Deficiency Rept Re Damage Sustained by Containment Liner Due to Fire within Containment Bldg, Initially Reported on 810911.Extent of Damage to Liner Anchoring Studs Being Assessed.Final Evaluation Forthcoming

ML20011A658
Person / Time
Site:	Millstone
Issue date:	10/13/1981
From:	Counsil W NORTHEAST NUCLEAR ENERGY CO.
To:	Haynes R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
10CFR-050.55E, 10CFR-50.55E, AEC-MP3-240, B10318, NUDOCS 8110290246
Download: ML20011A658 (2)

Text

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HARTFORD. CONNECTICUT 06101 7t$."I,78,$7 (203) 666-6911 L L A M M'C X l"~::

October 13, 1981 g eket No. 50-423 AEC-MP3-240 B10319

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Mr. Ronald C. Haynes, Director Region 1 Y@k,f_, f J, y [

N Office of Inspection and Enforcement l[#

U. S. Nuclear Regulatory Commission p OCT2 819815,-

631 Park Avenue (O) U.S. Wgegycu King of Prussia, PA 19406 $

Y 9 Gentlemen:  % @

Millstone Nuclear Power Station, Unit No. 3 Reporting of Potential Significant Deficiencies in Design and Construction As required by Title 10, Code of Federal Regulations Part 50, Paragraph 55(c), Northeast Nuclear Energy Company (NNECO) is reporting a sig-nificant deficiency in the construction of Millstone Unit No. 3 which is a result of damage to the containment liner. On September 11, 1981 Mr. B. L. Cari.3on of Northeast Utilities Service Company telephoned your Mr. T. Elsasser to report a potential significant deficiency regarding the damage sustained by the containment liner because of a fire within the containment building.

At present we are in the preliminary stages of assessing the problem.

As such, we are still making investigations to accurately assess the extent of damage involved. Visibly there appears to be two areas where the liner plate was overheated and as a result deformation took place which displaced the liner away from the concrete containment shell. As part of our damage assessment we are in the process of cutting inspection ports in the largest of the two deformed portions of the liner to more easily inspect suspected damage to the liner anchoring studs and also look for possible indications of damage to the concrete containment shell.

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8110290246 011013 PDR ADOCK 05000423 PDR g

4 4 When a final evaluation of.the damage ar.d a method is~ devised to make repairs, we will provide this:information to you.. Also, we will provide you with information.on what corrective measures have.

been or.will be taken to prevent, detect and mitigate a fire within the containment building as well as other areas.

Very truly yours, NORTHEAST NUCLEAR ENEEGY LOMPANY J lAt0_

W.'G. Couiisil' Senior Vice President cc: Mr. !!arold D. Thornburg, Director i Division of Reactor Construction Inspection i i '

Office of Inspection and Enforcement U. S. Nuclear Regulatory Commission Washington, D.C. 20555 Mr. J. C. Mattia Resident.NRC Inspector Office of Inspection and Enforcement P. O. Box 128 Waterford, CT 06385 4

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