ML20135A195

NPDES Noncompliance Notification:Between 970111-0201, Discharges of Wastewater Containing Trace Amounts of Hydrazine Occurred.Due to Maint Activities,Normal Pathway Could Not Be Used & Wastewater Directed to RBCCW Sump

ML20135A195
Person / Time
Site:	Millstone
Issue date:	02/11/1997
From:	Scace S NORTHEAST NUCLEAR ENERGY CO., NORTHEAST UTILITIES SERVICE CO.
To:	Grier J CONNECTICUT, STATE OF
References
D10751, SES-97-GN-025, SES-97-GN-25, NUDOCS 9702270043
Download: ML20135A195 (3)

Text

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Utilities System ,,

Memo.

February 11,1997

! SES-97-GN-025  ;

D10751 a

Mr. James Grier .

, Supervising Sanitary Engineer Water Management Bureau  !

Depe.L..sst of Environmental Protection ,

79 Elm Stmet Hartford, CT 06106-5127

Dear Mr.Grier:

Reference 1 Letter D01682 from S. E. Scace to J. Grier dated January 9,1997.

1 Reference 2 letter D10715 from S. E. Scace to J. Grier dated January 15,1997. )

Refeie: Tee 3 Letter D10695 from S.E. Scace to J. Grier dated January 10,1997.

Millstone Station i Notification ofDischarges Northeast Nuclear Energy Company (NNECO) has previously discussed with you protocols for reporting the processing of certain wastewater containing trace amounts of hydrazine until no hydrazine above detection limits is observed (References 1 through 3). Pursuant to these understandings, NNECO hereby submits the following written notification of discharges occurring between January 11 and February 1,1997. These discharges were discussed with you by phone on January 13 and February 3,1997 and in your office on February 7,1997.

Hvdrnine Removal Prior to Discharme via DSN 001C-2 On the dates listed below, wastewaters containing small amounts of hydrazine were detected in one of the High Level Waste Drains Tanks (HLWDT) associated with DSN 001C-2. Consistent with the manner in which similar wastewater was previously handled (References 1 and 2), the wastewaters in the HLWDT wem processed through the domineralizers and filters associated with DSN 001C-2 prior to discharge from the Waste Test Tanks. These wastewaters met all limits associated with DSN 001C-2. Further, no hydrazine above detectable limits (<5 ppb) using spectrophotometry was found. The initial concentrations detected, dates and volumes )

discharged are provided below: g o t' n n e: e:

(

9702270043 970211 PDR ADOCK 05000336 S PDR

r Initial Concentration Date Discharged Volume Discharged 13 ppb January 11,1997 17,220 gallons 15 ppb January 18,1997 15960 gallons -

206 ppb January 25,1997 18,900 gallons 729 ppb February 1,1997 16,590 gallons Hydr **ine Removal Prior to Dieharme via DSN 001C-3 On the dates listed below, wastewater containing small amounts of hydrazine was detected in the Low level Waste Drains Tank (LLWDT) associated with DSN 001C-3. This wastewater in the LLWDT was processed through filters associated with DSN 001C-3 and recirculated within the LLWDT to remove hydrazine to below detectable levels based on spectrophotometry (<5 ppb).

These wastewaters met alllimits associated with DSN 001C-3. The initial hydrazine concentrations detected, dates and the volumes discharged are provided below:

Imtial Concentration Date Discharged Volume Discharged 329 ppb January 25,1997 3440 gallons 329 ppb February 1,1997 3600 gallons 329 ppb February 1,1997 3200 gallons 329 ppb February 1,1997 3600 gallons Discharme of Unit 2 Reactor Buildine Cloud Cooline Water (RBCCW) Sumo Wastewater NNECO has previously discussed with you the discharge via DSN 001B-9 of certain wastewaters due to maintenance activities associated with the auxiliary heat exchangers at Unit 2 (Reference 3). These activities included high pressure washing of these systems using either der..:neralized or domestic water ('hydrolazing"). Due to maintenance activities, the normal ,

pathway (DSN 001B 5) could not be used and, as discussed with you, these waste waters were directed to the RBCCW sump and discharged from 001B 9. Accordingly, on January 11,1997 Millstone Station discharged 2744 gallons of wastewaters which originated from high pressure washing (hydrolazing) of the Unit 2 RBCCW heat exchangers was discharged via DSN 001B-9.

Demineralized water was used. Consistent with our past approach for these types of activities, the titration analytical method was used. At the time of discharge, hydrazine was not detected

(<350 ppb) using the titration method.

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

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

Very truly yours, NORTHEAST NUCLEAR ENERGY COMPANY 1

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je-ra s

' " i S.f. Scace j

Director NuclearEngineeringPrograms i

cc: M. Harder NRC 1

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