ML19289C408

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LER 79-1/04P on 790105:during Plant Shutdown,All 4 Cooling Tower Pumps Were Secured,Reversing Flow Thru Main Condenser, Resulting in Direct Backwash of Chlorine Additions Into the River.Addl Info & Corrective Action to Follow
ML19289C408
Person / Time
Site: Beaver Valley
Issue date: 01/05/1979
From: Werling J
DUQUESNE LIGHT CO.
To: Grier B
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
BVPS:JAW:622, NUDOCS 7901120147
Download: ML19289C408 (2)


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(412) 4M-4300 435 Sixth Avenue Rt urgh, Pennsylvania DUQUESNE LIGHT COMPANY Beaver Valley Power Station Post Office Box 4 Shippingport, PA 15077 r January 5, 1979 BVPS: JAW:622 Beaver Valley Power Staticn, Unit No. 1 Docket No. 50-334, License No. DPR-66

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LER 79-1/04P Mr. B. H. Grier, Director of Regulation United States Nuclear Regulatory Commission -

Region 1 631 Park Avenue King of Prussia, Pennsylvania 19406

Dear Mr. Grier:

In accordance with Environmental Technical Specifications 5.6.2.A and 2.3.1, the following occurrence is reported. The report was discussed via telephone with Dr. M. Shanbaky at 0920 hours0.0106 days <br />0.256 hours <br />0.00152 weeks <br />3.5006e-4 months <br /> on January 5, 1979.

During the current plant shutdown, all four cooling tower pumps were secured. With no cooling tower pumps in operation, flow through the main condenser is reversed due to operation of the turbine plant and reactor plant river water systems. Therefore, any chlorine additions intended for the condenser are backwashed directly to the river without passing through the condenser or the cooling tower.

On January 4, 1979, chlorination was performed in the river water systems and both condenser sections. At 1520 hours0.0176 days <br />0.422 hours <br />0.00251 weeks <br />5.7836e-4 months <br />, the high alarm on the chlorine analyzer at the outfall structure was received. At 1530 hours0.0177 days <br />0.425 hours <br />0.00253 weeks <br />5.82165e-4 months <br />, the free chlorine residuals reached a maximum of 2.0 PPM and, at 1610 hours0.0186 days <br />0.447 hours <br />0.00266 weeks <br />6.12605e-4 months <br />, returned to less than 0.5 PPM. ,

At 1745 hours0.0202 days <br />0.485 hours <br />0.00289 weeks <br />6.639725e-4 months <br />, the high alarm was again received and the maximum free chlorine residual measured was 0.65 PPM and, at 1815 hours0.021 days <br />0.504 hours <br />0.003 weeks <br />6.906075e-4 months <br />, returned to less than 0.5 PPM.

Any additional information and corrective action will be included in the followup report.

Very truly yours, Q

3 ^ "*' *"8 0112D M Superintendent (p @ 6

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a Mr. B. H. Grier .

January 5, 1979 ,, .d -

BVPS: JAW:622 Page 2

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cc: Director of Management & Program Analysis United States Nuclear Regulatory Commission Washington, D. C. 20555 D. L. Wigginton, BVPS Licensing Project Manager United States Nuclear Regulatory Commission Washington, D. C. 20535 D. A. Beckman, Nuclear Regulatory Commission, King of Prussia, PA G. A. Olson, Secretary, Prime Movers Committee - EEI e

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