RBG-23-850, NPDES Noncompliance Notification:On 860605,08 & 09,cooling Towers Oveflowed.Caused by Makeup Water Valve Sticking & When Cooling Tower Blowdown Secured Due to High Temps. Measures to Prevent Recurrence Under Evaluation

NPDES Noncompliance Notification:On 860605,08 & 09,cooling Towers Oveflowed.Caused by Makeup Water Valve Sticking & When Cooling Tower Blowdown Secured Due to High Temps. Measures to Prevent Recurrence Under Evaluation

ML20206D929
Person / Time
Site:	River Bend
Issue date:	06/10/1986
From:	Deddens J GULF STATES UTILITIES CO.
To:	Givens J LOUISIANA, STATE OF
References
RBG-23-850, NUDOCS 8606200454
Download: ML20206D929 (2)

Text

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GULF STATES UTILITIES l POSTOFFICEBox220 .ST FRANC 85VILLE. L O U IST A N A 70775 AREACODE 504 635 3237 387 4257 e

June 10, 1986 RBG-23,850 Mr. J. Dale Givens, Assistant Secretary Office of Water Resources Department of Environmental Quality P. O. Box 44091, Capitol Station Baton Rouge, LA 70804-4091 File Code Gl.ll.2 State Permits and Licenses Water Discharge Permit No. WP0409 NPDES' Permit No. LA0042131 Gulf States Utilities Company River Bend Station - Unit 1

Dear Mr. Givens:

This letter is a followup to the verbal notifications made by telephone on June 6, June 9, and June 10, 1986, of overflows of the River Bend Station cooling towers.

On June 5, 1986 from about 8:00 p.m. to 10:00 p.m., the cooling towers overflowed with an estimated maximum discharge rate of 1,000 gpm at the peak. Analysis of the cooling water during the period indicated a maximum total chlorine of 0.3 mg/l and a maximum free available chlorine of 0.1 mg/1. The overflow was caused when the cooling tower blowdown was secured because of high temperatures.

On June 8, 1986 from about 7:30 a.m. to 9:30 a.m., the cooling towers overflowed with an estimated maxinum discharge rate of 1,000 gpm at the peak. Analysis indicated that no free or residual chlorine was discharged. The m overflow was caused by the makeup water valve sticking.

ce of On June 9, 1986 from about 5:45 p.m. to 6:15 p.m., the 88 cooling towers overflowed with an estimated maximum on discharge rate of 500 gpm at the peak. Analysis indicated

• no free available chlorine and a total residual chlorine of gd 0.1 mg/l in the discharge. The overflow was again caused by 5 go a sticking makeup water valve. yf oc i .0 lm

@ In all three incidents the overflow was discharged via l oe Outfall 006 and in no case was there evidence of adverse ,Q.pi

$$m impact on the receiving waters. Gulf States Utilities Company is evaluating possible measures to prevent a recurrence of these events.

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'Page 2 of 2 RBG-23,850. ,

June 10, 1986

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> I certify under penalty of law that this document and all- attachments were prepared under the 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 manage the system, or those persons directly responsible for gathering'the information, _the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for submitting false information including the possibility of fine and imprisonment for knowing violations.

Sincerely,

3. C. Deddens Vice President River Bend Nuclear Group cc J. V. Conner J. W. Cook C. L. Nash '

W. H. Odell T. F. Plunkett B. L. St. Cyr Nuclear Document Control Mr. Myron Knudson (6W), Director Water Management Division U. S. Environmental Protection Agency, Region VI InterFirst Two Building, 1201 Elm Street Dallas, TX 75270 Capitol Region Office Water Pollution Control Division 11720 Airline Highway Baton Rouge, LA 70817-1720 Mr. Robert Bernero, Director Division of' Licensing Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D.C. 20555 Mr. Robert D. Martin, Administrator Region IV, U. S. Nuclear Regulatory Commission 611 Ryan Plaza Drive, Suite'1000 Arlington, TX 76011