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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ToLEyr pHlo 43652-0001 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, P. O. Box 466 w.,

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Bowling Green, Ohio 43402-0466

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 Elimination System (NPDES) Permit Number 2IB00011*ED for the Davis-Besse Nuclear Power Station.

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 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.

To prevent any discharge of hydrazine, the Outfall 602 pumps were.immediately l

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.

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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.

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

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