ML19350D644

LER 81-031/01T-0:on 810427,free Chlorine Measured at Outfall Structure & Duration of Condenser Tube Chlorination Exceeded Tech Spec Limits.Caused by Communication Problem Re Inservice Portions of Sys.Overchlorination Stopped

ML19350D644
Person / Time
Site:	Beaver Valley
Issue date:	05/11/1981
From:	Lacey W DUQUESNE LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19350D629	List: ML19350D628 ML19350D644
References
LER-81-031-01T, LER-81-31-1T, NUDOCS 8105180264
Download: ML19350D644 (2)

Text

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o l On April 27, the limits of Environmental Technical Specification 2.3.1 were l

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lo i A l I maximum limit of 0.5 ppm and the duration of condenser tube chlorination exceeded pots,I the 2 hour2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> time limit. The environmental impact on the river ecosystem was minimal l t o is l l and was contained withh the local mixinz zone. At the time of discharee, the riverl I

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. Attachment To LER 81-031/01T Beav'er Valley Power Station Duquesne Light Company ,

Docket No. 50-334 In order to maximize chlorination effectiveness, the chlorination system for the river and circulating water systems had been taken out of its normal automatic sequence and was being manually operated. The testing in progress on April 27, 1981 was to ascertain the effectiveness of chlorinating twice a day. It was during the second period of chlorination that the incident

' occurred . -

The manual chlorination of the condenser'was stopped when the chemist at the outfall structure noted an unexpected rise in the free chlorine residuals being discharged. At this. time, the sample shewed chlorine still below the discharge limit while the chlorination time had been exceeded by 20 minutes.

Eventually, the chlorine peaked at 0.68 ppm. The incident resulted from a communications problem between the operator stationed in water treating and the chemists on shif t as to what portions of the system were in service.

Since the incident, operating clearance tags were placed on the controls of the river and circulating water chlorination system. These tags permit operation of the system by chemistry personnel only, which should climinate the possibility of communication breakdowns of this sort in the immediate future. -

As a permanent corrective action, the system will be placed back into automatic operation. This will occur following the determination of the optimum method of chlorination by'the chemistry rection. At that time, it is expected that control will be returned to the operations section under explicit, approved procedures.

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