ML20084J332

Ro:On 730313 & 27,sample of Discharge Bay & Mississippi River Downstream of Diffuser Pipe Showed Chlorine Residual in Bay High.Condenser Tubes to Be Cleaned During Apr Outage

ML20084J332
Person / Time
Site:	Quad Cities
Issue date:	04/14/1973
From:	Stephenson B COMMONWEALTH EDISON CO.
To:	Giambusso A US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20084J323	List: ML20084J321 ML20084J332 ML20084J355 ML20084J366
References
BBS-73-66, NUDOCS 8305120549
Download: ML20084J332 (2)

Text

g, Com salth Edison f'N o Quad C Nuct:ar Pow rSt: tion (#). g Post Offica Box 216 Cordova, Illinois 61242 f s ,,

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%d a y April 14, 1973

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Mr. Angelo Giambusso Deputy Director for Reactor Projects Directorate of Licensing U. S. Atomic Energy Commission Washington, D. C. 20545

Reference:

Quad-Cities Nuclear Power Station Docket Numbers 50-254 and 50-265 DPR-29 and 30, Appendix B, j Section 1.1 and 3 1.A I

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Dear Mr. Giambusso:

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) The purpose of this letter is to report chlorine residual concentrations in the discharge bay in excess of the limiting conditions for operation in the non-radiological technical specifications. The limit of 0.1 ppm free and combined chlorine in the discharge bay was exceeded on several occasions since my last report on this subject dated March 12, 1973 On March 13, 1973, Bio-Test Laboratories and Commonwealth j Edison sampled the discharge bay and the Mississippi River I downstream of the diffuser pipe. The total chlorine residual in the river was less than 0.1 ppm at all times, however, the discharge bay total chlorine residual registered as high as 0 34 ppm. A total of 440 gallons i of sodium hypochlorite was injected at this time. On March 23, 1973, the entire system was taken out of service for half a day to repack Unit 2 residual sample pump.

On March 27, 1973, station personnel sampled the discharge bay for free and combined chlorine during the injection of 580 gallons of sodium hypochlorite. The maximum free chlorine level was .20 ppm chlorine level was 1.6 ppm., whj.le the maximum combined Ag

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0305120549 730511 gDRADOCK05000 L- _ _ _ _ _ _ _ _ _ __ - - - - - . - - - - - - -

,. *1F O- O Mr. Angelo Giambusso April 14, 1973 Throughout this reporting period the system was operated three times a day with the flow manually set at 10 gallons per minute. Lower chlorination flow rates have proved to be ineffective. During our April outage, both unit one and unit two condenser tubes will be cleaned and the chlorination flow rate and frequency will be re-evaluated.

Very truly yours, COMMONWEALTH EDISON Quad-Cities Nuclear Power Stati'on y'

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B. B. Step enson Plant Superintendent BBS/zm i