ML20138F027

NPDES Noncompliance Notification:On 970218,normal Pathway Could Not Be Used for Discharge of Wastewaters Due to Maint Activities Associated W/Hxs at Unit 2

ML20138F027
Person / Time
Site:	Millstone
Issue date:	03/26/1997
From:	Scace S NORTHEAST NUCLEAR ENERGY CO., NORTHEAST UTILITIES SERVICE CO.
To:	Grier J CONNECTICUT, STATE OF
References
SES-97-GN-049, SES-97-GN-49, NUDOCS 9705050238
Download: ML20138F027 (2)

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107 seidea street, Berlin, cr 06037 f t[ Norilietist Utilities S*cm Northeastunhtie service company P.O. Box 270 ilartford, Cr 06141-0270 l (203) 665-5000 l

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1 March 26,1997 SES-97-GN-049 D10935 Mr. James Grier Supervising Sanitary Engineer Water Management Bureau l Department of Environmental Protection 79 Elm Street Hartford, CT 06106-5127 Reference 1 Letter D10751 from S. Scace to J. Grier dated February 11,1997 l

Reference 2 Letter D10837 frori S. Scace to M. DiNoia dated February 24,1997 i

Dear Mr. Grier:

Northeast Nuclear Energy Company (NNECO) has previously discussed with you the discharge via DSN 001B-9 of certain wastewaters due to maintenance activities associated with the heat exchangers at Unit 2 (References 1 and 2). These activities include draining of seawater (i.e., sen/ ice water) from the "B" Reactor Building Closed [0 Cooling Water (RBCCW) heat exchanger inlet pipe, the seawater side of the "C" RBCCW heat exchanger, the seawater side of the "B" Unit 2 emergency diesel generator, and high pressure washing using either demineralized or domestic water (hydrotazing). Due to some or all of these maintenance activities, the normal pathway (DSN 0018-5) could not be used and these wastewaters were directed to the RBCCW sump and discharged from DSN 0018-9. Consistent with our past approach for these g.%3 types of activities, the titration method was used for analysis of hydrazine. At the time of discharge, hydrazine was not detected (<0.350 ppb).

NNECO has previously (Reference 2) provided written notification of a discharge from the Unit 2 RBCCW sump (DSN 001B-9) which occurred on February 18,1997. The following provides information with respect to each additional discharge occurring after February 18,1997 as a result of these continuing activities:

9705050238 970326 PDR ADOCK 05000336 S PDR h

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Volume Free l Date Discharaed (aallons) Available Chlorine Temperature (F) l 7,592 seawater 0.03 ppm 58.6 l 2/19/97 l

2/20/97 10,256 seawater 0.02 ppm 63.0 2/21/97 4,452 seawater 0.02 ppm 58.0 2/22/97 2,324 seawater 0.03 ppm 56.0 l 2/24/97 644 seawater & <0.02 ppm 69.0 deionized water

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• Wastewaters originating from hydrolazing of the "C" RBCCW heat exchanger.

During each of the above discharges, a minimum of at least two condenser circulating pumps were in operation and the maximum daily flow did not exceed 30,000 gallons l per day.

Should you have any questions, please call Mr. Paul Jacobson, Environmental Services

- Nuclear, at (860) 447-1791 Ext. 2335.

Very truly yours, NORTHEAST NUCLEAR ENERGY COMPANY t_ cC S.E.'Scace Director - Nuclear Engineering Programs cc:

M. Harder, CT DEP NRC