ML20117H672

NPDES Noncompliance Notification:On 960419 Discovered That Hydrazine Concentration in North Settling Basin Exceeded. Internal Outfall 602 & External Outfall 001 Closely Monitored for Hydrazine

ML20117H672
Person / Time
Site:	Davis Besse
Issue date:	04/25/1996
From:	Jeffery Wood TOLEDO EDISON CO.
To:	Plotts R OHIO, STATE OF
References
NUDOCS 9605290038
Download: ML20117H672 (4)

Text

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o 0 TDLEDO ED 10N .

A Centerior Energy Company o AVENdE*

ToLEyr pHlo 43652-0001 l

April 25, 1996 Mr. Robert Plotts, Environmental Specialist Division of Water Pollution Control Ohio Environmental Protection Agency ,

Northwest District Office 347 North Dunbridge Road $O - 3L Q, l P. O. Box 466 w.,

Bowling Green, Ohio 43402-0466 ~ " " ' " =

Dear Mr. Plotts:

1

Subject:

Unauthorized Discharge for Ohio Environmental Protection Agency National Pollutant Discharge Elimination System Permit Number 2IB00011*ED This notification is being provided in accordance with Part III, Section 12(D) ,

of the Ohio Environmental Protection Agency (EPA) National Pollutant Discharge l Elimination System (NPDES) Permit Number 2IB00011*ED for the Davis-Besse  ;

Nuclear Power Station. l On April 10, 1996, the station began draining water from the feedwater system, which contains hydrazine, an oxygen scavenger, to the facility's north settling i basin, Number 2 Basin (see Attachment 1). Approximately every 18 months, the i feedwater system, like the other station equipment, is drained for inspection and maintenance. 1 l

To prevent any discharge of hydrazine, the Outfall 602 pumps were.immediately l locked out. However, by April 14, 1996, the north settling basin was filled to '

capacity. On April 14 at approximately 1320 hours0.0153 days <br />0.367 hours <br />0.00218 weeks <br />5.0226e-4 months <br />, one of the butfall 602 pumps had to be turned on to prevent the basin from overflowing. The pumps remained on until April 16, 1996, at 1940 hours0.0225 days <br />0.539 hours <br />0.00321 weeks <br />7.3817e-4 months <br />. The hydrazine concentrations i during this discharge were previously reported to you in a letter submitted on  !

April 18, 1996. j Due to the north settling basin again reaching capacity, the Outfall 602 pumps were turned on April 19, 1996, at 1053 hours0.0122 days <br />0.293 hours <br />0.00174 weeks <br />4.006665e-4 months <br /> to prevent the basin from overflowing. The hydrazine concentration in the basin at that time was 24.7 ug/L.

Following discovery of this exceedance on Friday, April 19, 1996, both the

, internal Outfall 602 and the external Outfall Op1 have been closely monitored for hydrazin'e. A list of these results is enclosed (see Attachment 2).

The remainder of the systems containing hydrazine are being drained to the middle settling basin, Number 1 Basin. This basin has been isolated to allow the hydrazine to dissipate prior to discharge.

9605290038 960425

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PDR s

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i Page 2 This incident was first reported to your office on April 19, 1996, at 1200 hours0.0139 days <br />0.333 hours <br />0.00198 weeks <br />4.566e-4 months <br />. Then, at the request of Mr. Richard Zuzik of your office, a call was made to the Ohio EPA Emergency Response Center on April 19, 1996, at 1500 hours0.0174 days <br />0.417 hours <br />0.00248 weeks <br />5.7075e-4 months <br />, in accordance with Section 12(A) of our NPDES permit. This event was -

given Incident Identification Number 9604-62-1560. y.

Should you have any questions regarding this matter, please contact Mr. James L. Freels, Manager - Regulatory Affairs, at (419) 321-8466.

Sincerely yours, b

J hn K. Wood Plant Manager Davis-Besse Nuclear Power Station TKW/lkm Attachments 4

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i Davis-Bases Nuc. Powcr Station

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.. Evaporothre Loss io MGD Unit No.1

Meksua circulating Toledo Edison Co.

2s.7 MGD

' Water ino m Ottawa County ,,

system Oak Harbor, Ohio tsumnte ,

Intake Cnb

~ ' es '

Cooling Tower Make up Intake 48.5 MGD - c OMD O

O serweewater l

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T tment

1. ' k OW 0.22 MGD

[ ik7 MGD berles) )A f

m em 02: mD Lake Erie

.MGDQ .

NcL2

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Basing WaterTreatment I T g. _gy Keat Exchangers , 0.15MGD 0.07 MGD Make up r% e g No.1 e

' Primary'. '[i se a'ry' i ction  ; d

+ M 0.08 MOD Outtan set

. . rC' . . J;i Wast 6. vater Stat 100 Basin f(

(( Effluent 0 os MGD 28.7 mod (Mt001)

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em 0.005 MGD (

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Padwaste Systems ( Navarre Marsh O j " (Poci No. 2) 2 m mpg 0.009 M GD m $ -

andsarmary 3 g -

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• gy e - Out!at ,

'b$tlon Dha$i% 002 Navarre Marsh VN Sumps 4 O' I g 0.10 MGD Water 0.05 MGD (to Toussaint Rver) h Toussaint River

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l - .+

l. HYDRAZINE LEVELS (ug/L) l OUTFALL 602 OUTFALL 001 l

! DATE TIME CONCENTRATION CONCENTRATION L 4/14/96 1505 hrs. 63 NA 4/14/96 1800 hrs. 55 5.6 y "a ,

4/15/96 0140 hrs. 56 5.2 l 4/15/96 1020 hrs. 56 <5 4/15/96 1735 hrs. 65 5.2 4/16/96 0140 hrs. 61 5.6 4/1S/96 0840 hrs. 12 <S l 4/16/96 1310 hrs. 56 NA 4/16/96 1920 hrs. 45 8.1 4/16/96 1940 hrs. Pumps tumed off l *The above values were previously reported on 4/18/96*

l 4/19/96 1053 hrs. Pumps tumed on

4/19/96 1150 hrs. 24.7 NA l 4/19/96 2015 hrs. 26 NA 4/20/96 0440 hrs. 23 6.6 i 4/20/96 1000 hrs. 22 2.7 i 4/20/96 1115 hrs. Pumps tumed off 4/23/96 0955 hrs. 12 NA 4/23/96 1219 hrs. Pumps turned on

4/23/96 1415 hrs. NA <5 j 4/23/96 2005 hrs. 10 <5 4/24/96 0215 hrs. 11 <5

4/24/96 1005 hrs. 7 <5 4/24/96 1925 hrs. 10 <5 4/24/96 2255 hrs. Pumps tumed off I

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• i l Attachment 2 Page 1 of 1

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