05000317/LER-1979-075-04, /04T-0:on 791129,waste Neutralizing Tank Overflowed to Ground in Unmonitored Discharge Against Environ Tech Specs.Caused by Operator Error in Reading Tank Level.Procedures Revised

/04T-0:on 791129,waste Neutralizing Tank Overflowed to Ground in Unmonitored Discharge Against Environ Tech Specs.Caused by Operator Error in Reading Tank Level.Procedures Revised

ML19256F304
Person / Time
Site:	Calvert Cliffs
Issue date:	12/13/1979
From:	Eherts R BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19256F299	List: 05000317/LER-1979-075, Forwards LER 79-075/04T-0 05000317/LER-1979-075-04, /04T-0:on 791129,waste Neutralizing Tank Overflowed to Ground in Unmonitored Discharge Against Environ Tech Specs.Caused by Operator Error in Reading Tank Level.Procedures Revised
References
LER-79-075-04T, LER-79-75-4T, NUDOCS 7912180469
Download: ML19256F304 (2)

LER-1979-075, /04T-0:on 791129,waste Neutralizing Tank Overflowed to Ground in Unmonitored Discharge Against Environ Tech Specs.Caused by Operator Error in Reading Tank Level.Procedures Revised

Event date:
Report date:
3171979075R04 - NRC Website

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60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DAT E 80 EVENT DESCRIPTION AND PRoSABLE CONSEoUENCES O'o l At 0020 while performing a rinse of #12 make-up train resin the Service i

O 2 l Building Operator discovered that #12 Waste Neutralizing Tank (WNT) was I

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10141 1 overflowing to the ground, resulting in an unmonitored discharge of the 1

[ WNT which is not allowed by Environmental T.S. 2.2.1.

No environnental l

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lO ls l 1 impact is expected due to the small amount of partially exhausted regenerant i

10171 I chemicals discharaed as comnared to the dilution flow rate. Unit 2 was in l

101Bl l Mode 5.

This is not a repetitive occurrence.

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O I The cause was apparently an operator error in readino the tank level and I

I apoarent disregard to events while performing a regeneration.

Imediate i

i i 1 corrective action was to revise the procedures to reouire the operator to-1 i

2 i record WNT level hourly while WNT's are in use.

Further measures to prevent l

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EVENT DATE 11/29/79 REPORT DATE 12/13/79 3'

ATTACHMENT l

CAUSE DESCRIPTION AND CORRECTIVE ACTION:

(CONTINdED) j At 0020 while performing a rinse after regenerating the resin of #12 make-up train the Service Building Operator discovered #12 Waste Neutralizing Tank (WNT) level indication was pegged high; he immediately secured the rinse.

Subsequent investigation revealed the WNT to be full and overflowing to the ground, resulting in an unmonitored discharge of the tank, which is not allowed by Environmental Tech Spec 2.2.1.

A sam

.l to 12.1 and total dissolved solids (TDS)ple taken of the tank showed a pH equal equal to 12,000 ppm. A calculation based on ititial tank level and flow to the tank revealed the quantity of regenerant waste and rinse water that spilled on the ground to be approximately 8,400 gallons.

j No environmental impact is expected since a rinse cycle was in progress resulting in dilution of the tank contents. The spilled regenerant waste was further I

diluted by the flow in outfall 002, thus significantly minimizing any environmental impact associated with this event.

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