ML20140D957

NPDES Noncompliance Notification:Between 970504-08, Discharges of Wastewater Containing Hydrazine Occurred.Due to Maint Activities,Normal Pathways Could Not Be Used & Waste Water Directed to RBCCW Sump

ML20140D957
Person / Time
Site:	Millstone
Issue date:	05/30/1997
From:	Scace S NORTHEAST NUCLEAR ENERGY CO., NORTHEAST UTILITIES SERVICE CO.
To:	Grier J CONNECTICUT, STATE OF
References
SES-97-GN-093, SES-97-GN-93, NUDOCS 9706110160
Download: ML20140D957 (2)

Text

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Nerthecst 107 saa s=, sek cr 06037 Utilities System .

mium se compaor P.O. Box 270 Hartford, CT 06141-0270 (203) 665-5000 May 30,1997 SES-97-GN-093 D11156 1

Mr. James Grier Supervising Sanitary Engineer Water Management Bureau Department of Environmental Protection 1

79 Elm Street '

Hartford, CT 06106-5127 Report of Millstone Unit 2 Discharaes '

)

Dear Mr. Grier:

Northeast Nuclear Energy Company (NNECO) has previously discussed with you the protocols for the discharge of certain wastewaters due to maintenance activities associated with the heat exchangers at Unit 2 (References 1,2,3,4,5 and 6). In this letter NNECO wishes to report the discharge of wastewaters via DSN 0018-9 from draining activities associated with the Reactor Building Closed Cooling Water (RBCCW) system and hydrotazing activities associated with the RBCCW heat exchangers.

During the month of May, activities associated with the draining of the RBCCW sump included high pressure washing (hydrolazing using deionized water) of the three RBCCW heat exchangers and the draining of service water from the RBCCW sump.

Due to these maintenance activities, as previously discussed with your Department, the normal pathway (DSN 001B-5) could not be used and these wastewaters were directed to the RBCCW sump and discharged from DSN 001B-9. Consistent with our past approach for these types of activities, the titration method was used for the analysis of hydrazine. At the time of each discharge, hydrazine was below detectable limits (< 350 PP).b The following provides additional information with respect to each discharge from the ,f cs, p

L'3L MlWIlWlltimilmIVI!In 9706110160 PDR ADOCK 05000336 05309-[n o S PDR

' .' RB"CCW sump via DSN 001B-9 which occurred during the month of May 1997 Volume Free Available Date Discharaed (aal) Chlorine (nom) Activity Te m o.(F) 5/4/97 656 0.05 RBCCWsump 70 drain 5/5/97 2,940 < 0.02 Hydrolazing 70 5/6/97 9,140 < 0.02 Hydrolazing 79 5/7/97 1,196 <0.02 Hydrolazing 74 5/8/97 1,052 <0.02 Hydrotazing 71 Each discharge met all NPDES permit requirements associated with the discharge of wastewaters at DSN 001B-5 and DSN 0018-9.

i Should you have any questions, piease call Mr. Paul Jacobson, Environmental Services- Nuclear, at (860) 447-1791 Ext. 2335. l i

Very truly yours, j

NORTHEAST NUCLEAR ENERGY COMPANY ca w S.$. Scacef '

Director - Nuclear Engineering Programs cc:

NRC and NRC Resident inspector 1

Reference 1 Letter D10751 from S. Scace to J. Grier dated February 11,1997 Reference 2 Letter D10837 from S. Scace to M. DiNoia dated February 24,1997 Reference 3 Letter D10873 from S. Scace to J. Grier dated March 6,1997 Reference 4 Letter D10935 from S. Scace to J. Grier dated March 26.1997 Reference 5 Letter D10962 from S. Scace to J. Grier dated April 11,1997 Reference 6 Letter D11074 from S. Scace to J. Grier dated May 6,1997 l