ML20076E282
| ML20076E282 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 08/14/1991 |
| From: | Reckert R NORTHEAST UTILITIES SERVICE CO. |
| To: | Harder M CONNECTICUT, STATE OF |
| References | |
| D04862, D4862, NUDOCS 9108190203 | |
| Download: ML20076E282 (2) | |
Text
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August 14, 1991 D04862 Mr. Michael J. Harder Attention: Mr. G. L. Leavitt Department of Environmental Protection 165. Capitol Avenue Hartford, CT 06106
Dear Mr.-Harder:
Millstone Nuclear Power Station, Unit No. 3 Permit No. CT0003263 Notification of Potential Deviation From Permit Condition Northea:;t Utilities Service Company-(NUSCO), on behalf of Wortheast Nuclear Energy Company (NNECO), hereby notifies you of the potential to deviate from conditions specified in Millstone Nuclear Power Station (M_ill stone) NPDES Permit No. CT0003263.
Millstone Unit No. 3 is shut down.for the cleaning and removal of mussels that had = fouled the noncontact cooling water (service water) for auxiliary plant
_ his. water is permitted to discharge from DSN 001C-5.
In dis-T equipment.-
mantling-the service water supply lines to the emergency diesel generator, it is_ necessary to provide a backup cooling water supply to the diesel generator should a power failure mandate its operation.
Approximately 1500 gpm of municipal city water will be the backup water supply.
The' normal chlorine concentration in the city water supply has been found to be about 0.5 mg/L FAC.
Because DSN 001C-5 has a chlorine limit of 0.25 mg/L FAC, it is possible that should the use of the city water be neces-sary, the chlorine _ limit may be exceeded.
The city water will not be used unless an emergency requires the operation of the generator.
The ' temporary city water-supply will be terminated as soon as the normal service water is reconnected.
91b8'190203 910814 ADOCK0500g3 DR l' 0
e Mr. Michael J. Harder 004862/Page 2 August 14, 1991 i
Millstone does not expect to use the emergency backup city water supply, but should it be necessary, the DEP will be appraised of the status.
Should you require any further information, please call Mr. Nicholas J. Lanzalotta, NUSCO Production Operation Services, at (203) 665 5657.
Very truly yours, NORTHEAST UTILITIES SERVICE COMPANY i
As Agent for Northeast Nuclear Energy Company
__/
C /
R. A. Reckert j
Vice President cc:
T. T. Martin, Region 1 Administrator D. H. Jaffe, NRC Project Manager, Millstone Unit Nos. 1 and 3 W. J. Raymond, Senior Resident Inspector, Millstone Unit Nos. 1, 2, and 3 U.S. Nuclear Ragulatory Commission Attention: Document Control Desk Washington, DC 20555 hRC Docket No. 50-423 4,