ML19322A075

LER 78-057/04T-0 on 781216:during Normal Operation While Regenerating 11 make-up Water Demineralizers,Approximately 172 Gal of Caustic Solution Were Discharged Via Outfall 001. Caused by Inadvertent Operator Action

ML19322A075
Person / Time
Site:	Calvert Cliffs
Issue date:	12/22/1978
From:	Eherts R BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19322A073	List: ML19322A072 ML19322A075
References
LER-78-057-04T, LER-78-57-4T, NUDOCS 7901020171
Download: ML19322A075 (2)

Text

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EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h IOI2i I Durino nomal operation while receneratinc #11 Make-Un Water Demineralizers l 10 la i I approx.172 gallons of caustic solution partially neutralized by 15 gallons l 10: 4i [ of acid weredischarged via outfall 001. The discharge occurred over a 90 14 I O l s i I minute time period at approx. 2.2 gpm and was diluted by a circulating water l r57;rl l flow of 2,462,000 gpm. (For further description, see attached sheet). l 10171 1 I I

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LICENSEE EVENT REPORT 73-57/4T DOCKET NO. 50-317 REPORT DATE 12/22/78 EVENT DATE 12/16/78 ATTACHMENT

'"' NT DESCRIPTION AND PROBABLE CONSE0VENCES: (CONT)

. During nomal plant operation, while regenerating #11 Make-Up Demineral-izers, an inadvertent discharge from #12 Waste Neutralizing Tank occurred.

Approximately 172 gallons of caustic solution (50 wt %) were discharged via Outfall 001 together with 15 gallons of acid (99 wt %) which served to partially neutralize the base. The discharge occurred over a 90-minute period with an approximate flow rate of 2.2 gpm which was subsequently diluted with 2.462 x 10o gpm of circulating water flow.

CAUSE DESCRIPTION AND CORRECTIVE ACTION: (CONT)

The cause of this reportable occurrence has been determined to be operator error. Immediate corrective action involved re-instruction of respective plant operating personnel to sensitize them to the causes of inadvertent Waste Neutralizing Tank discharge. Additional corrective action will involve a procedural change to incorporate a Waste Neutralizing Tank effluent valve position check prior to regeneration operations. The combined corrective action should-minimize the possibility of a recurrence of this event.

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