05000317/LER-1978-057-04, /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

/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: 05000317/LER-1978-057, Forwards LER 78-057/04T-0 05000317/LER-1978-057-04, /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
References
LER-78-057-04T, LER-78-57-4T, NUDOCS 7901020171
Download: ML19322A075 (2)

LER-1978-057, /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

Event date:
Report date:
3171978057R04 - NRC Website

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60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 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).

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lX l9 l9 l9 lg 33 34 35 31 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h g l Cause has been determined to be inadvertent operatcr action.

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g l operation of Waste Neutralizing Tank and implementation of a procedure i

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Y-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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