ML20044H114

Requests Permission to Use Sodium Bromide,On Trial Basis,To Control Biological Growth During Summer Months.Sodium Bromide Effective in High Ph Water & Need for Sulphuric Acid Should Almost Completely Be Eliminated

ML20044H114
Person / Time
Site:	Catawba
Issue date:	05/27/1993
From:	Wylie R DUKE POWER CO.
To:	Eleazer T SOUTH CAROLINA, STATE OF
References
NUDOCS 9306070419
Download: ML20044H114 (4)

Text

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II I Duke Ibuer Company Genwation Services Department 13339llagers Ferry Road I!anterwdle, NC28078-7939 DUKEPOWER May 27, 1993 To: Mr. Timothy Eleazer Division of Industrial & Agricultural Wastewater Bureau of Water Pollution Control South Carolina Department of Health and Environmental Control 2600 Bull Street Columbia, SC 29201

Subject:

Catawba Nuclear Station NPDES Permit No. SC0004278 Notification of Maintenance Chemical Use "

File: CN-702.13

Dear Mr. Eleazer:

With reference to our recent telephone conversation, Duke Power Company (DPC) requests permission to begin this summer on a trial basis the use of sodium bromide at the subject facility.

Catawba Nuclear Station is a two unit steam electric generating station, with each unit having a cooling tower system. One of the primary maintenance activities for the i cooling towers is the control of biological growth.

Historically, the biological growth has been greatest in the warmer months. During this trial period DPC proposes .

that sodium bromide will be used in one unit with the results of its effectiveness being compared to the other unit.

At present the biological growth is treated by the use of sodium hypochlorite. However sodium hypochlorite is not as effective when the water pH increases above 8 Standard Units. Thus the addition of sulfuric acid is needed to readjust the pH. Sodium bromide is effective in higher pH water. By using approximately 100 gallons of 40 to 46 % liquid sodium l bromide solution (normally every two days) of sodium bromide it is anticipated that the current sodium hypochlorite dose will -l be reduced to more than half of its present dose requirements  !

and also the need for sulfuric acid should almost be completely  !

eI'_minated.

07 142 9306070419 930527 PDR ADOCK 05000413 S3

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In order to evaluate this product.it is advantageous to begin  ;

its usage during the warmer conths. Attached are the items as -

required by the subject permit Part III Item 9. We apologize '

for requesting this approval in such a short time, however we think that the proposed restrictions (Attachment 1) will ,

ensure that the environment is adequately protected.

1 Please advise if you need additional information. You may contact me at (704) 875-5970. If possible DPC would like to  ;

begin using this product by July 1, 1993. Your cooperation is .

appreciated. '

i Sincerely, h/. (

Robert R. Wyl e, Engineer Environmental Division .!

Generation Services Department l i

cc: NRC Distribution

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John Velte - ASC .

Tony Jackson - CNS

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ATTACHMENT 1 CATAWBA NUCLEAR STATION PROPOSED SODIUM BROMIDE USAGE MAY 27, 1993 i

NPDES PERMIT SC0004278 PART III ITEM 9 REQUIREMENTS

1) NAME AND GENERAL COMPOSITION OF THE MAINTENANCE CHEMICAL a) Liquid Sodium Bromide (40 to 46% solution)

2) QUANTITIES TO BE USED Approximtely 100 gallons of product.

2) FREQUENCY OF USE Every two days.

4) PROPOSED DISCHARGE CONCENTRATION

! Since chlorine and bromide are both oxidants it is proposed that I

the current limits on Outfall 005 of 0.2 mg/l monthly average and 0.5 mg/l daily maximum for Free Available Chlorine be changed to Free Available Oxidant. (Outfall 005 is an internal outfall that discharges upstream of Outfall 001. Flow through . Outfall 001 typically allows for an approximate 9 to 1 dilution ratio.)

5) EPA REGISTRATION NUMBER The EPA Registration Number for one of the sodium bromide products under evaluation is 1706-168. Once the actual manufacturer / supplier

• is selected an update can be provided if needed.

6) AQUATIC TOXICITY INFORMATION l

l a) SODIUM BROMIDE -I l

96 hour0.00111 days <br />0.0267 hours <br />1.587302e-4 weeks <br />3.6528e-5 months <br /> static acute LC 50 to Fathead Minnow = 16,479 ppm.

96 hour0.00111 days <br />0.0267 hours <br />1.587302e-4 weeks <br />3.6528e-5 months <br /> static acute LC 50 to Poecilia reticulata = 225 ppm.

48 hour5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> static acute LC 50 to Daphnia magna = 7,900 ppm.

b) HYPOBROMOUS ACID (acid generated from Sodium Bromide) 4 96 hour0.00111 days <br />0.0267 hours <br />1.587302e-4 weeks <br />3.6528e-5 months <br /> static acute LC50 to Bluegill Sunfish = 0.52 ppm (as Br2) 96 hour0.00111 days <br />0.0267 hours <br />1.587302e-4 weeks <br />3.6528e-5 months <br /> NOEC for Bluegill Sunfish is 0.30 ppm based on no mortality.

48 hour5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> static acute LC50 to Daphnia Magna = 0.71 ppm (as Br2) 48 hour5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> NOEC for Daphnia magna is 0.41 ppm based on no mortality.

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