ML20195E488

Part 21 Rept Re Potential Failure of Ite/Gould Disconnect Switch,Type 7860 Ds Series.Instructions for Verification of Proper Operation of Switches Included in Notification to Plants.New Switches Available by 860901

ML20195E488
Person / Time
Site:	Fermi, Harris, Columbia, Clinton, 05000000
Issue date:	05/23/1986
From:	Erhardt J TELEMECANIQUE, INC.
To:	Finkel A NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
REF-PT21-85, REF-PT21-86, REF-PT21-86-193-000 PT21-86-193, PT21-86-193-000, NUDOCS 8606090105
Download: ML20195E488 (2)

Text

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Telemecanielue l l May 23,1986

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I U.S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, Pennsylvania 19406 Attention: Mr. Alan Finkel Reactor Engineering Plant Systems Section

Subject:

ITE/Gould Disconnect Switch, Type 7860 HDS Series Potential Failure Notification Pursuant to Requirements of 10 CFR 21.21 (b)

Dear Mr. Finkel:

During inspection of returned defective Type 7860 HDS Disconnect Switches from commerical customers, it was found that under certain conditions of combined tolerancing, humidity and temperature,some of these devices could fail to close, preventing the associated circuits from being energized.

It is to be noted that these devices are used as isolating or dis-connecting devices and, as such, are not directly utilized for manual or automatic start and stop operation of the associated load (motors, heaters...).

The number of devices in use at nuclear installations is approximately 1,500.

Since this product was obsoleted in July 1984, and it cannot be determined with precision to which extent each of the factors influence the potential nonperformance of the device,. no modification of this, now obsolete, product is being considered.

Instructions for verification of proper operation of these devices are being incorporated in the individual notification of the potentially affected nuclear power station sites.

Although this product is now obsolete, equivalent switches, Class A81, are available from Telemecanique Inc. Additional qualification testing to IEEE 323 and 344 will have .to be completed before these replacement _f devices, if needed, can be furnished to nuclear users.

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TELEMECANIQUE INC.,2002 BETHEL ROAD, WESTMINSTER, MD (301)876-2214 INVENTIVE SOLUTIONS TO CONTROL PROBLEMS

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[@] Telemecanique U.S. Nuclear Regulatory Commission

, May 23,1986 Page 2 Fully qualified devices are expected to be available by September 1, 1986. As these switches are physically different from the Type 7860 HDS Switches, modification kits including mounting brackets, doors and hardware, will have to be tailored to each application.

The Type 7860 HDS Switches have been furnished to the following nuclear sites:

Taiwan Maanshan Nuclear Station Gould/ITE S0 #84-63296 Detroit Edison, Fermi II Gould/ITE S0 #84-12528 WPPSS - Unit II Gould/ITE S0 #84-78179 Carolina Power & Light /

Shearon Harris Gould/ITE S0 #84-60823-110 Illinois Power /Clinton Gould/ITE S0 #84-30115 The sites are being directly notified of the potential problem by first class mail.

Sincerely, f /s/

/ V. Erhardt Vice President, Engineered Controls Operation JVE/nd cc: T. Caputo, Telemecanique Inc.

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