ML072470425

Cooling Tower Basin Chlorination Schedule

ML072470425
Person / Time
Site:	Limerick
Issue date:	08/24/2007
From:	Callan E W Exelon Generation Co, Exelon Nuclear
To:	Garg S L Office of Nuclear Reactor Regulation, State of PA, Dept of Environmental Protection, Bureau of Water Quality Management
References
NPDES PA00051926
Download: ML072470425 (3)

Text

• ExelknE ,on Nuclear www.exeloncorp.comN Limerick Generating Station Nucea V.0. Box 2300 Pottstown, PA 19464 NPDES PA 00051926 August 24, 2007 Mr. Sohan Garg.Chief, Permits Section Water Management Program Department of Environmental Protection 2 East Main Street Norristown, PA 19401

Subject:

Cooling Tower Basin Chlorination

Reference:

LGS Industrial Waste NPDES Permit PA00051926

Dear Mr. Garg:

Limerick Generating Station has been implementing a conservative cooling tower basin chlorination schedule, in order to ensure that the two hour per day, per unit, NPDES Permit application limit for Total Residual Oxidants is not exceeded.Since the Spring of 2006, increased algae growth on the cooling tower raceways has been a .recurring problem during warm weather months, resulting in blockage of fill section inlets, and spillage over the sides of the raceways.

The spill volume has been as great as 19,000 gallons per day, with all flow discharging to Outfall 021. These overflow scenarios result in increased:

Operations Department personnel manpower requirements to operate deicing systems when not normally needed; Maintenance personnel activities to mechanically clean the raceways and cooling tower basin weir screens; and sampling'and analysis activities as a result of discharges to Outfall 021.This correspondence is to request an increase in the maximum allowable discharge duration, per unit, from two hours to three hours per day. This would not impact.the current daily maximum effluent limitation concentration for Total Residual Oxidants of 0.2 mg/L at Outfall 001.It is anticipated that this change would preclude problematic algae buildup on the cooling towers, while allowing LGS to meet its continued commitment to full NPDES Permit compliance.

This letter contains no commitments.

Thank you for your cooperation in this matter. Should you have any questions regarding this information, please contact Bob Alejnikov at 610-718-2513.

Sincerely; Edward W. Callan Plant Manager Limerick Generating Station Exelon Generation Company, LLC cc: S. Collins, Region 1 Administrator, USNRC S. Hansell, Resident Inspector, USNRC Document Control Desk, USNRC, Wash. DC bcc: E. Callan -GML 5-1 C. Mudrick -GML 5-1 T. Basso -SSB 2-1 S. Mitten -SSB 2-1 R. Alejnikov

-SSB 2-1 T. Siglan -KSA 3N R, Kreider -SSB 2-4