05000317/LER-1981-033-04, /04T-0:on 810506,during Normal Operation,Outside Operator Discovered Waste Neutralizing Tank 12 Drain Valve Leaking.Caused by Small Amounts of Particulate Matter Lodged Between Valve Seat & Wedge.Valve Flushed & Closed

/04T-0:on 810506,during Normal Operation,Outside Operator Discovered Waste Neutralizing Tank 12 Drain Valve Leaking.Caused by Small Amounts of Particulate Matter Lodged Between Valve Seat & Wedge.Valve Flushed & Closed

ML20027C829
Person / Time
Site:	Calvert Cliffs
Issue date:	05/20/1981
From:	BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20027C828	List: 05000317/LER-1981-033, Forwards LER 81-033/04T-0 05000317/LER-1981-033-04, /04T-0:on 810506,during Normal Operation,Outside Operator Discovered Waste Neutralizing Tank 12 Drain Valve Leaking.Caused by Small Amounts of Particulate Matter Lodged Between Valve Seat & Wedge.Valve Flushed & Closed
References
LER-81-033-04T, LER-81-33-4T, NUDOCS 8210270275
Download: ML20027C829 (2)

LER-1981-033, /04T-0:on 810506,during Normal Operation,Outside Operator Discovered Waste Neutralizing Tank 12 Drain Valve Leaking.Caused by Small Amounts of Particulate Matter Lodged Between Valve Seat & Wedge.Valve Flushed & Closed

Event date:
Report date:
3171981033R04 - NRC Website

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LER NO.

81-33/4T DOCKET NO.

50-317 LICENSE NO.

DPRs.

EVENT DATE 05-06-81 REPORT DATE 05-20-81 ATTACHMENT EVENT DESCRIPTION AND PROBABLE CONSEOUENCES At 1700 during normal operation, the outside operater discovered that #12 Waste Neutalizing Tank (WNT) drain valve (DW-367) was leaking through at approximately I gpm (Environmental T.S. 2.2.1). The tank had been in service te receive regeneration waste since 1400 en 5-5-31 and the water level was 13.5'. A sample of the waste water revealed a pH of 10.6 and T.D.S. of 4600 ppm. Attempts to tighten the valve were not effective. At 1721 the operator cracked cpen the valve and fir hed approximately 20 gallons of waste water across the valve seat. Tr.e valve was then successfully shut tight stopping the leak. It is conservatively estimated that 1320 gallons of regeneration waste water leaked to the Chesapeake Bay af ter being diluted with 1.2 million gpm circulating water flow. LER 79-24 describes a similar event.

CAUSE DESCRIPTION AND CORRECTIVE ACTIONS (CONT'D)

The Waste Neutralizing tank receives the backwash and spent regenerants from the Condensate Demineralizing System. A main purpose of the backwash cycle of the demineralizer regeneration is to remove unwanted resin particles and metal oxides from the chemica!!y exhausted bed.

Therefore, the waste neutralizing tank is expected to contain small amounts of particulate matter which may occasienally lodge on the valve seat and interfere with proper isolation. Considering the frequency of occurrence and the insignificance of the environmentalimpact, the occurrence described in LER 79-24 and this one represents satisfactory performance and no corrective action is deemed necessary.

ENVIRONMENTAL IMPACT The irapact of release into Chesapeake Bay water of alkaline solution (pH 10.6) would be measured by the magnitude of the pH change in the receiving waters. The change has been calculated to be no greater than 0.01 pH units. Such a small change could not be perceived by organisms at the pH range of Bay water of 7.5-8.5 pH units. Consequently, the impact on the receiving water would be very small if at all.

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