ML20056H143

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Requests Trial Alternate Method Be Approved by State for Drainage of Cooling Towers at Util
ML20056H143
Person / Time
Site: Catawba  Duke Energy icon.png
Issue date: 08/31/1993
From: Estridge J
DUKE POWER CO.
To: Eleazer T
SOUTH CAROLINA, STATE OF
References
NUDOCS 9309080289
Download: ML20056H143 (5)
v • d • e


Text

5D Duke Ibuer Company Generation Services Department 1.039llagers Ferry Road fluntersvulle. NC28078-7929 DUKEPOWER August 31, 1993 Mr. Timothy M. Eleazer Industrial and Agricultural Wastewater Division South Carolina Department of Health and Environmental Control 2600 Bull Street Columbia, SC 29201

Subject:

Catawba Nuelear Station- Cooling Tower Drainage NPDES Permit No. SC0004278 File: CN-254.00

Dear Mr. Eleazer:

The purpose of this memo is to request that a trial alternate method be approved by the State for drainage of the cooling towers at the Catawba Nuclear Station. At the start of each nuclear refueling outage, one of the first tasks which must be accomplished is to drain the water out of the cooling towers and condenser cooling system. Presently, this task requires approximately 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br /> to accomplish. If the proposed method is approved, the task will be reduced to approximately 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.

Present Method of Drainage The cooling water contained in the towers and plant condenser cooling system consists of approximately 7.5 million gallons of raw water from Lake Wylie per unit. There are three cooling towers per each nuclear unit for a total of six cooling towers at the Catawba site containing approximately 15 million gallons of water.

Upon the start of an outage the water contained in the cooling system is removed as follows: For the unit 1 cooling towers, approximately 5 million gallons is discharged via outfall 005-001 at a flow rate of approximately 15,000 GPM. The remaining water is drained to the turbine building sump and pumped to the conventional waste treatment system (WC) and discharged via outfall 002.

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v Page #2 Cooling Tower Drainage For Unit 2 the process is similar but the volumes are slightly different. Approximately 3 million gallons discharge via outfall 005-001 and 4.5 million gallons to the turbine building sump.

Proposed Method of Drainage t

In order to expedite the removal of water from the cooling towers and cooling system, the following method is requested. Tne cooling  ;

towers will be drained in three phases. The three phases refer to the different elevations from which the water will be drained.

The initial phase will consist of draining the water out of the cooling towers by means of the blow down line, outfall 005, and I outfall 001 using the normal method of water removal. This phase  !

would bring the water to approximate elevation 619 - the yard  !

elevation of the cooling towers.

The second phase would begin after the water has reached elevation  !

619. At this point a manway will be removed from the condenser -

cooling piping system (RC). The RC piping is 14 feet in diameter and runs between the cooling towers and the condenser. Water will  ;

be pumped from the RC piping into a storm drainage yard drain. The i yard drain flows toward and discharges to Lake Wylie near the j intake structure.  !

The total volume of water to be discharged during the second phase  !

is approximately 1.8 million gallons at a flow rate of 18,000 gallons per minute. _

The third phase would be very similar to the second phase, however,  ;

it would be at a lower elevation. The third phase would begin at approximate elevation 593 - the yard elevation next to the plant  ;

within the protected area boundary. L Once the water elevation reaches 593, a manway would be removed and the water will be pumped from the RC piping to a yard drain. This i yard drain flows toward outfall 001 and discharges to Lake Wylie in i the general vicinity of outfall 001.  !

The total volume of water to be discharged during the third phase i is approximately 3.7 million gallons at a flow rate of 60,000 i gallons per minute. I Erosion control will not be a problem as these storm drainage structure discharge directly to Lake Wylie. The above flow rates and volumes are only approximate volumes and were calculated based upon the flow capacity of the storm drainage system.

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l Page #3 '

Cooling Tower Drainage Please find attached a general layout sketch showing the various ,

NPDES outfalls for the Catawba Nuclear site. This sketch also '

shows the proximity of the cooling towers to Lake Wylie along with  !

other plant features. [

t Summary Approval of this request will simply allow the water in the cooling towers to be removed faster. All the water within the cooling l system will still discharge into Lake Wylie regardless of the  !

method used to dewater the cooling towers. If at all possible, we would like to request approval for this be granted by September 8,  !

1993 in order to prepare for the next scheduled outage in late -

October.

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Should this initial trial be successful, we will request that '

permanent approval be granted to dewater the cooling towers in this ,

manner. If.you need additional information or have any questions i please give'me a call at (704) 875-5965.

Sincerely, ,

- w~ N Jo n Estridge, eer i Environmental' Division, Water Protection i jte/224 cc: NRC Document Distribution I i

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Cooling Tower Drainage l

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