ML20096C576

Part 21 Rept Re Potential Defect in Power Lead Gland Assemblies Qualified for Nuclear Svc.Parts 7D92-11000-01-04, 7D92-11001-01-05,N-11150-01 & N-11151-01 Showing Loss of Electrical Continuity.Customer Informed & Evaluation Begun

ML20096C576
Person / Time
Site:	Perry, Vermont Yankee, 05000000
Issue date:	08/31/1984
From:	Rautio W, Routio W CONAX CORP. (FORMERLY CONAX BUFFALO CORP.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE)
References
REF-PT21-84-432-000 PT21-84-432, PT21-84-432-000, NUDOCS 8409050352
Download: ML20096C576 (4)

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' CONAXCORPORATION,2300WALDEN AVENUE, BUFFALO,NEWYORK 14225 TEL.716484-4500 TELEX- 91-275 August 31, 1984 Director Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission

- Washington,- D.C. 20555

Subject:

Notification of a Potential Defect Conax Power Lead (PL) Gland Assemblies Qualified For Nuclear Service Gentlemen:

Your attention is directed to our telephone communication with your Mr. Harry

- Kisteo of Regional Office 1 on August 29, 1984 concerning reasonable indica-tion of a defect. A conditioned situation exists which Conax has designated a potential defect.

This formal communication is submitted as timely evidence of our compliance to the requirements of 10 CFR Part 21, Paragraph 21.21, b(2), with the following

'information being provided to the extent known to date per items i through viii of _ paragraph 21.21, b(3), of 10 CFR Part 21.

I)_ Reportina Individual:

W. S. Rautio President Conax Buffalo Corporation 2300 Walden Avenue-Buffalo, New York 14225 (716) 684-4500 II) A. Component Identification

~ Conax Qualified Nuclear Service Power Lead Gland Assemblies Conax Part Numbers: 7 5 2-11000-01, -02, -03, -04 7D92-11001-01, -02, -03, -04, -05 )

N-lll50-01 I' N-11151-01 l

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B. Facility Identification

i. Vermont Yankee Nuclear Plant Governor Hunt Road Vernon, VT 05354 li. Perry Nuclear Power Plant, Units 1 & 2 Perry, Ohio 44081 (P.O. Box 85)

-III) Component Supplier Conax Buffalo Corporation 2300 Walden Avenue

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Buffalo, New York 14225 IV) . Nature of Potential Defect The nature of the potential defect, as designated by Conax, is a loss of electrical continuity, resulting from a gradual reduction in the cross-sectional area of the conductors in the internal sealant area of the gland and eventually leading to total conductor separation in some cases. The phenomea appears to be related to time, temperature, and initial assembly torquing and may be unique to Vermont Yankee's normal operating environment.

The result of phenomea could affect the electrical performance of safety related equipment into which these assemblies have been installed.

V) Date of Information.

This potential defect was brought to my attention in a meeting held on August 27, 1984 by S. M. Dale, Chief. Engineer of our Industrial Products Division and W. C. Federid<, Manager of our Nuclear Products Division.

J VI) Number and Location of Components A. Forty-six (46) Power Lead Gland Assemblies, as follows, were supplied to Vermont Yankee Nuclear Plant in July,1984 26 pcs - 2 conductor /16 AWG (Conax P/N N-lll50-01) 20 pcs - 8 conductor /14 AWG (Conax P/N N-lll51-01)

B.. Eic)t hundred and twenty-one (821) Power Lead Gland Assemblies, as follows, were supplied to Perry Nuclear Power Plant, Units 1 and 2, in March thru June of 1984.

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69 pcs - 2 conductor /14 AE (Conax P/N 7D92-11000-01) 128 pcs - 4 conductor /14 AWG (Conax P/N 7D92-11000-02) 57 pcs - 6 conductor /14 AWG (Conax P/N 7092-11000-03) 9 pcs - 8 conductor /14 AWG (Conax P/N 7D92-11000-04) 294 pcs - 2 conductor /16 AWG (Conax P/N 7092-11001-01) 55 pcs - A conductor /16 AWG (Conax P/N 7D92-11001-02) 3 pcs - 4 conducter/16 AWG (Conax P/N 7W2-11001-03) 9 pcs - 8 conductor /16 AWG (Conax P/N 7D92-11001-04) 197 pcs - A conductor /16 AWG (Conax P/N 7D92-11001-05)

'VII) Corrective Action Both Vermont Yankee Nuclear Plant and Perry Nuclear Power Plant, Units 1 and 2, were notified on August 27, 1984 concerning the potential defect

.and of our requirement to report to the NRC. At that point, Vermont Yankee had already removed all their. Power Lead Gland Assemblies from service. Within the next 180 days, Conax will complete an evaluation of

~ the parameters that may cause this potential defect and will advise the Perry Nuclear Power Plant of the results.

VIII) Recommendations and Advice Until the causes of the potential defect are determined, Conax is unable to fully evaluate the existance of a safety hazard for the Perry Nuclear Power Plant. Conax will provide information as it becomes avsilable to the Perry Nuclear Power Plant for their assessment of the situation.

Conax recommends that the Power Lead Glands not be utilized in any safety related circuits until the evaluation is complete.

For further clarification of our position or any additional information, please contact me directly.

Very truly yours, CONAX BUFFALO CORPORATION

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cc: Boyce H. Grier, Director, Region 1 Office of Inspection and Enforcement -

U. S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, PA 19406 Mr. Ridlard Pagodin Engineering Support Supervisor Vermont-Yankee Nuclear Power Corporation P.O. Box 157 Vernon, VT 05354 Mr. George Hengerly Yankee Atomic Electric Company 1671 Worcester Road Framingham, MA 01701 W1. Paul Martin.

General Supervisory Engineer PAQS

.The Cleveland Electric Illuminating Company Perry Nuclear Power Plant, Units 1 and 2 P. O. Box 85 Perry, Ohio 44081 Conax Buffalo Corporation: M. W. Connell J. E. Adams R. A. Fox D. P. Jensen W. C. Federick R. L. Duroure R. E. Farchmin S. M. Dale

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