ML19269C170

LER 79-001/04T-0 on 790104:chlorination Performed in River Water Sys & Condenser Section.High Alarm on Chlorine Analyzer Received Twice;Chlorine Reached Max of 2.0 Ppm. Caused by Reversed Flow Through Condenser

ML19269C170
Person / Time
Site:	Beaver Valley
Issue date:	01/19/1979
From:	Werling J DUQUESNE LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19269C163	List: ML19269C162 ML19269C170
References
LER-79-001-04T, LER-79-1-4T, NUDOCS 7901290264
Download: ML19269C170 (2)

Text

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EVENT DESCRIPTION AND PROSA8LE CONSEQUENCES h IYI~IIl Plant shtiedown with all cooline to.ier pumps secured. On 1./4/79. chlorination was l F5"TTI l 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 />. l f5"TT1 I the high alarm on the chlorine analyzer at the outfall structure was received. At l -

o s l 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 g

[Tpi") hours, 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 g ITTTI I received and the maximum free chlorine residual was 0.65 PPM and, at 1815 hours0.021 days <br />0.504 hours <br />0.003 weeks <br />6.906075e-4 months <br />, (

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en l42Nl@ lZ 43 l@ 44 Z l9 l9 9l@ 47 CAUSE OESCRIPTION ANO CORRECTIVE ACTIONS h y l With no cooling tower pumps in operation, flow through the condenser is reversed  ;

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• O M PHCNE:

Attachment To LER 79-01/04T Beaver Valley Power Station Duquesne Light Company Docket No. 50-334 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 ard reactor pleut river water systems. Therefore, any chlorine additions intenced 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 PPh.

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.

Ohio River flow at the time of the incident was approximately 5.4 x 10 GPM, resulting in a dilution factor of 2,000 in the local mixing zone. The high chlorine demand of the river further reduced the effect of the chlorine outside the local mixing zone. No adverse impact to the river ecosystem occurred outside the local mixing zone.

A procedure change was issued requiring chemistry personnel to verify cooling tower pump operation prior to chlorination. An investigation is under way to determine if a suitable interlock can be provided to prevent chlorination when no cooling tower pumps are in operation.

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