ML20216E052

Forwards Corrected Page 7 & Water Quality Data Summary Table to May 1997 Discharge Monitoring Rept

ML20216E052
Person / Time
Site:	Millstone
Issue date:	08/28/1997
From:	Scace S NORTHEAST NUCLEAR ENERGY CO.
To:	Dinoia M CONNECTICUT, STATE OF
Shared Package
ML20216E056	List: ML20216E052 ML20216E834
References
SES-97-GN-141, NUDOCS 9709100068
Download: ML20216E052 (2)

Text

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R pe Ferry Rd. (Route 156), Eterford, CT 06385 Nht Nuclear Energy m.iooe Noa r rmt sianoo

, .. Northeast Nuclear Energy Company

~ P.O. Bos 128 hterford, CT 06385 0128 (860) 447179t Fan (860) 444-4277 August 28,1997 m Northeast Utihdes Pystem SES-97-GN 141 D11439 Ms. Michele DiNoia Bureau of Water N,anagement l Department of Environmental Protection 79 Elm Street Hartford, CT 06106-5127 l

l Millstone Nuclear Power Station NPDES Permit # CT 0003263 May 1997 DMR Corrections

Dear Ms. DiNoia:

As part ofits continuing review of environmental matters at Millstone Station, Northeast Nuclear Energy Company NNECO, has previously notified the Department, pursuant to Section 22a-430(jXaXc) of the Regulations of Connecticut State Agencies, that it had identified the need to correct its May Discharge Monitoring Report (DMR) relative to the reporting of differential temperature and heat load determinations at DSN 001C.

By way of background, NNECO's Environmental Data Acquisition Network (EDAN) generates differential temperature and heat loading calculations for all 3 Units. There are three probes which monitor intake temperature; one for each Un t. When the Unit 3 probe is not operational, EDAN is programmed to default to the intake temperature measurement probe used by Unit 2. However, when the Unit 2 probe is out of service at the same time, NNECO, in reviewing this matter, has learned that EDAN, due to a programming oversight, does not capture data from the intake temperature probe used at Unit 1.

At Unit 3. EDAN is programmed to monitor intake temperature from inside the circulating water pump discharge piping. D uring May, the circulating water pumps were not continually in operation due to plant shutdown and, a.' a consequence, the piping was void of water leaving the temperature probe exposed to air. While EDAN automatically defaulted to the Unit 2 probe, no readings were obtained because the Unit 2 probe was not operational as well. Since EDAN at Unit 3 is not programmed to utilize the probe used by F Unit 1, heat load and differential temperature was calculated by EDAN as "zero" gM

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--* . ,W ith respect to the heat load and differential temperature data at Unit 3 reported on the DMR for the month of May, these entries have been revised based on data from the intake temperature probe used by Unit 1.

This is reflected in the attached corrected page 7 and Water Quality Data Summary table. Revisions are

- underway to EDAN such that it will now automatically seek out and utilize data from a working intake temperature probe whenever any other probe is rendered inoperable.

Should you have any questions regarding this letter, please call Mr. P. M. Jacobson, Manager Environmental Services Nuclear at (860) 444 1791 ext. 2335.

Very truly yours, I

NORTHEAST NUCLEAR ENERGY COMPANY

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5. E. Scace Director Nuclear Engineering Programs cc: NRC Resident inspector NRC Mr. James Grier 2

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