ML20133H194

NPDES Noncompliance Notification:On 850705 & 08,approx 120,000 Gallons Water/Ammonia Solution Discharged to Training Ctr Pond.Caused by Draining of Two Steam Generators.Release Data Encl

ML20133H194
Person / Time
Site:	Davis Besse
Issue date:	07/29/1985
From:	Quennoz S TOLEDO EDISON CO.
To:	Monson R OHIO, STATE OF
References
G85-533AL, NUDOCS 8508090229
Download: ML20133H194 (5)

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MREDO EDISON E 2.40.1.1.1 G85 533AL July 29, 1985 Ohio Environmental Protection Agency Northwest District Office 1035 Devlac Grove Road Bowling Green, Ohio 43402 ATTN: Mr. Robert bbnson

Subject:

Notification in Accordance with the Davis-Besse NPDES Permit Number 21B000ll*DD of a Discharge Containing Water and Ammonia Solution to the Davis-Besse Training Center Pond and to Final Outfall 002.

Dear Mr. Manson:

This letter, in conjunction with the telephone conversation between yourself and Matt Collins of Toledo Edison on July 3, 1985, is being sent to notify you of a discharge containing water and ammonia solution from the Davis-Besse Nuclear Power Station. The quantity discharged was approximately 120,000 gallons of water and ammonia.

• The ammonia solution was a result of draining the two steam generators at the Davis-Besse Station. The steam generators contain approximately 60,000 gallons of water with a concentration of 75 ppm hydrazine, which is used as an oxygen scavenger. During drainage, the solution containing hydrazine is routed to a sump where hydrogen peroxide is added to convert the remaining hydrazine to ammonia. Once this has occurred, the solution is discharged to the 6.2 acre Davis-Besse Training Center Pond. The ef fluent from this pond is discharged with area runoff from final Outfa14 002.

The draining of the steam generators took place on July 5, 1985, and July 8, 1985. The waste solution consisted of the initial drainage and secondary flushing of each of the units. Initial concentrations were estimated at 75 ppm hydrazine, with 10.6 ppm detected in the sump following flushing.

Monitoring of pH and hydrazine analyses were performed at the points of dis-charge to and from the pond on the dates mentioned. Attached is a data sheet with the results of this testing.

8500090229 050729 PDR ADOCK 05000346 45 s PDR )7 THE TCLEDO EDISON COMPANY EDISON PLAZA 300 MACISON AVENUE Ifl N

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TCLEDO. OHIO 43652

w .w Mr. Robset Man on I

• July 29, 1985 -

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An attachment describing the methods for determining the peroxide dosage is also included for your review.

If you have any questions regarding this notice, please contact Patrick J.

! McCloskey, Environmental Monitoring at (419) 249-5000. Ext. 711.

Yours truly, M 7Ph? - -g Stephen M. Quennoz [

Plant Manager r Davis-Besse Nuclear Power Station  !

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I SMQ/PJM/yal enei.

cc R. Scott D. Briden '

J. Sullivan D. Hennen bec: J. Williams, Jr.

A. Gephart C. Daft R. Klein E. C. Novak

• J. F. Helle ,

S. Quennos J. J. Pfeiffer l J. Scott-Wasilk K. Pauer W. Rogers, NRC -

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Data for Release of Steam Cenerator Drainage to the Davis-Besse Training Center Pond l NH 24 Data Time Location Concentration Comments

/1/85 --

Steam Generator #1 74.0 ppm Initial concentration prior to any release Steam Generator #2 72.5 ppm Initial concentration prior to any release

/5/85 0445 Hotwell to west 74.5 Concentration in sump at start of sump release Training Center Dato Time Pond Inlet / outlet Comments

/5/85 0930 Training Center 66.8 ppm 30 ppb H,02 at 200 ml/ min. Increased to Pond 800 ml/ min 1400 Training Center 19.4 ppm 12 ppb Pond 1930 Training Center 12 ppm 72 ppb #1 Steam generator drain complaced Pond

/6/85 0830 -- -- --

1. 2 Draining. Release halted due to deminished H 220 supply

/8/85 1400 -- -- --

1. 2 Steam generator drainage reinstituted

/8/85 2000 Training Center 3 ppm, 16 ppb --

Pond

/9/85 0600 -- -- --

Draining of #2 steam generator complete

//9/05 1345 Hotwell Sump 10.6 ppm Concentration in hotwell after com-plation of drainage

/9/85 1430 Training Center <2 ppb Final analysin showed N H levels Pond 24 below detection at pond inlet and outlet e

'. 1 CALCULATIONS FOR NEUTRALIZATION OF llYDRAZINE BY llYDROCEN PEROXIDE

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A stoichiometric determination of the ratio by weight of peroxide required to '

neutralize hydrazine was performed.

NH2 4 + 2H 022 4II 0 + N (g) Complete Reaction 2 2 flydrazine 1NH 3 2H 0 24 32 A ratio of 3H 0 1NH 32 24was established to account for incomplete reaction with ammonia (NH 3

) as a product.

The total number of pounds of N24 H required to be neutralized was detemined and the corresponding weight of 110 22 was calculated using the 3:1 ratio and a !! 22 0 soluticn strength of 25% by weight.

75 ppm x 8' 1h*

x 0.06 HG = 37.5 lbs N24 Ii l

3 lbs H 2O 4 37.5 lbs N H * = 450 lbs

0. 5 2 4

• 1 lb N 2H'

= 49 gal. 25% H 02 2 (by weight) where H0 22 S luci n Concentration = 25% by weight H0 22 S luti n Specific Gravity = 1.10 The amount required to neutralize the steam generator rinse and contents of sump were calculated based on the 24 N tI e ncentrati n f 10.6 com in the rinse.

8. Ibn 10.6 ppm x x 0.06 HG = 5.30 lbs N II 24  ;

3 lbs H 0 1.0 5.30 lbs N24 H x 1 lb N H22 * "

N 24 0.25 22

= 6.9 gal. 25% !! 22 0 (by weight) 1 Combining the above, the total gallons of 110 #'9"I'*d *** ** I ll "

22 49.0 + 6.9 = 55.9 gallons 25% 1102 2 (by weight)

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t The calculated initial feed race of 25% H 0, was 200 ml/ min. However due to f incompleteneutralization,thefeedratedatincreasedto800ml/ min.

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0 n x 55.9 gallons = 223.6 gallons 25% H 02 2 (by weight) l t

l The actual amount of H22 0 used (as measured) wass l I

4 drums x 55 gal / drum = 220 gallons 25% H 02 2 (by weight) f i

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