ML19256F304

LER 79-075/04T-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

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: ML19256F298 ML19256F304
References
LER-79-075-04T, LER-79-75-4T, NUDOCS 7912180469
Download: ML19256F304 (2)

Text

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, LICENSEE EVENT REPORT -

(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

CONTROL B LOCK: l 1

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EVENT DESCRIPTION AND PRoSABLE CONSEoUENCES O'o O 2 l At 0020 while performing a rinse of #12 make-up train resin the Service i O 3 l Building Operator discovered that #12 Waste Neutralizing Tank (WNT) was I 10141 1 overflowing to the ground, resulting in an unmonitored discharge of the -

1 O s [ WNT which is not allowed by Environmental T.S. 2.2.1. No environnental l 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. I

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44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h i O I The cause was apparently an operator error in readino the tank level and I i i I apoarent disregard to events while performing a regeneration. Imediate i i 2 1 corrective action was to revise the procedures to reouire the operator to- -

1 1 3 i record WNT level hourly while WNT's are in use. Further measures to prevent l i 4 I recurrence are being considered. I 7 8 9 80 STA US  % PCWER OTHER STATUS dis O Y DISCOVf

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t LER NO. 79-75/4T .0 '

DOCKET NO. 50-317 50-318 t 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 to 12.1 and total dissolved solids (TDS)ple equal totaken ofppm.

12,000 the tank showed a pH equal .l 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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