ML20009F737

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Responds to 810715 Telcon Requesting Util Position Re Primary Plant Demineralized Water Storage Tank Level Transmitters.Both Transmitters Are Seismically Qualified & Powered from Vital Bus 2.No Need to Modify Power Supply
ML20009F737
Person / Time
Site: Beaver Valley
Issue date: 07/21/1981
From: Carey J
DUQUESNE LIGHT CO.
To: Varga S
Office of Nuclear Reactor Regulation
References
TAC-44632, NUDOCS 8107310478
Download: ML20009F737 (1)


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,h sm 458-e000 U5" July 21, 1981 Director of Nuclear Reactor Regulation United States Nuclear Regulatory Commission Attn:

Mr. Steven A. Varga, Chief Operating Reactors Branch No. 1 Division of Licensing Washington, DC 20555

Reference:

Beavec Valley Power Station, Unit No. 1 Docket No. 50-334, License No. DPR-66 Telecom D. Chaney/K. Grada, July 15, 1981 Gentlemen:

This letter is in response to your request for our position and intentions in regard to the Primary Plant Demineralized Water Storage Tank (PPDWST)

Level Transmitters (LT-WT-104Al, A2).

Both transmitters are seismically qualified and powered from Vital Bus 2.

This pcwer supply is automatically sequenced on to the emergency diesel on loss of normal AC and backed up by the batteries should this supply iail.

The transmitters are located in a tornado protected enclosure along with the PPDWST.

Both transmitters provide remote level indication in the Control Room and redundant high and low level alarms.

In addition to these transmitters, a local tank level indication is available. All three indications are checked each shift and recorded in the station logs. A loss of power to either transmitter will result in a full downscale indicated reading and a low level alarm. The local "f] oat type" level indicator would provide indication should a power failure occur to both channels.

Since these level indicators perform no safety related control function and their failure would not inhibit initiation of any automatic safety related function, we do not intend to modify the power supply to these units.

If you have any questions in this matter, please contact my office.

Sincerely,

.M

. J. Care ice President, Nuclear cc: !!r D. A. Beckman, Resident Inspector 6 S. Nuclear Regulatory Commission Beaver Valley Power Station Shippingport, PA 15077 t!. 5 - Nuclear Regulatory Commission c/o Document Management Branch g

Washington, DC 20555 8107310478 910721 hf PDR ADUCK 05000334 J

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