ML20154K025
| ML20154K025 | |
| Person / Time | |
|---|---|
| Site: | River Bend  |
| Issue date: | 05/25/1988 |
| From: | Deddens J GULF STATES UTILITIES CO. |
| To: | Knudson M ENVIRONMENTAL PROTECTION AGENCY |
| References | |
| RGB-27973, NUDOCS 8805270227 | |
| Download: ML20154K025 (3) | |
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..o nso swa w cm a m u niu m u 4som3 A ; N T OC D4 635 C:M W dH1 May 25, 1988 RBG-27973 File No. G1.11.7 50-457 Mr. Myron 0. Knudson, P.E.
Director, Water Management Division (6W)
U.S. Envircnmental Protection Agency, Region IV Allied Bank Tower at Fountain Place 1445 Ross Avenue Dallas, TX 75202-2733 Attn:
Ms. Wren Stenger
Dear Mr. Knudson:
NPDES Permit No. LA0042731 River Bend Station - Unit 1 Gulf States Utilities (GSU) hereby requests an Administrative Order to allow use of cooling water treatment chemicals in addition to those previously described in applications for NPDES Permit No. LA0042731.
River Bend Station is a nuclear-fueled steam electric generating station located on the east bank of the Mississippi River south of St. Francisville in West Feliciana Parish, Louisiana.
Station cooling is provided by forced draft cooling towers and noncontact cooling water. Makeup to the cooling systems is drawn from and blowdown is discharged to the Mississippi River.
Outfall 001 is the combined discharge of cooling tower blowdown and previously monitored low-volume wastes from Outfall 002.
Current treatment of cooling water consists of adding:
tolytriazole salts for control of copper corrosion; polyacrylate /
polysilicate salts for control of mild steel corrosion; a phosphate blend for control of scale formation; sulfuric acid for control of pH; and sodium hypochlorite for control of biofouling.
The treatment chemicals currently used do not contain any of the Priority Pollutants listed in 40CFR423, Appendix A.
Continuous low-level chlorination of normal service water, which represents about ten percent of total cooling water flow, is required for control of Asiatic clams (Corbicula sp.).
Addition of bisulfite salts to the blowdown is used to remove low levels of residual chlorine when necessary.
After about two years of stion at River Bend Station, testing and direct observation of cooling systc
..ndicates a need for enhancement of treatment practices for mild steel.crosion inhibition. Three corrosion inhibitors, suitable for mild steel, have been identified which can be used singly or in various combinations: polysilicate salts (currently in use); zine salts; and phosphate salts.
Preliminary evaluation indicates that adequate protection of mild steel can be achieved with zine levels of 1.0 mg/l or less.
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Mr. Knudson Page 2 May 25, 1988 To enable adequate testing and ultimate use of the treatment options associated with the various combinations of corrosion inhibitors GSU requests that the Administrative Order be issued for a term of 18 months. Twelve months of this term will be needed for testing and evaluation and 6 additional months will be needed to submit and receive approval of the permit modification request, if the effectiveness of the zine treatment is proven for continued use.
GSU proposes that the Administrative Order be issued with discharge limits for zine for Outfall 001 of NPDES Permit No. LA0042731 of 1.0 mg/l daily average and 1.0 mg/l daily maximum, in accordance with the provisions of 40CFRA23.
Proposed monitoring would be conducted at Outfall 001 once per week by trab sample.
The proposed cooling water treatment program will consist of:
Polysilicate salts, zine salts, and/or phosphate sa.ts, either singly or in combination for mild steel corrosion control; Tolytriazole salts or equivalent for copper corrosion control; Polyacrylate / phosphate blend or similar polyelectrolyte for scale control; Sodium hypochlorite for control of biofouling; and Sulfuric acid for pH control.
With the exception of the zine noted above, no chemicals which contain any of the Priority Pollutants listed in 40C FR4 2 3, Appendix A, will be used for treatment of cooling water.
Should you require further information, please contact Mr. James W.
Cook at the above address or at (504) 381-4151.
CERTIFICATION I certify und-r penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gather and evaluate the information submitted.
Based on my inquiry of the person or persons who those persons directly responsible for gathering the manage the system, or information submitted, the information submitted is, to the best of my l
knowledge and belief, true, accurate and complete.
I am aware that there are l
significant penalties for submitting false inf orma tion,
including the possibility of fine and imprisonment for knowing violations, Sincerely, i
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James C. Deddens I
Senior Vice President
/)b' River Bend Nuclear Group JCD/JEB/LAE/JVC/jNb. '
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Ms. Maureen O'Neill, Assistant Secretary
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Office of Water Resources Department of Env'ironmental Quality Post Office Box.44091, Capitol Station Baton, Rouge, LA 70804-4091 U.S. Nuclear Regulatory Commission Document Control Desk Washington, D.C. 20555 U.S. Nuclear Regulatory Commission 611 Ryan Plaza Drive,' Suite 1000 Arlington, TX 76011 NRC Resident Inspector Post Office Box 1051 St. Francisville, LA 70775 i
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