ML20052A646

Updated LER 81-018/01T-1:on 811123,component Cooling Water Discharge Valve to Keowee Tailrace Inadvertently Opened & Failed to Close,Resulting in Loss of Prime for Emergency Cooling Discharge Line.Caused by Procedural Deficiencies

ML20052A646
Person / Time
Site:	Oconee
Issue date:	02/19/1982
From:	Kutzer J DUKE POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20052A642	List: ML20052A641 ML20052A646
References
LER-81-018-01T, LER-81-18-1T, NUDOCS 8204280540
Download: ML20052A646 (3)

Text

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DUKE POWER "0MPANY OCONEE UNIT' 2 AND 3 Report Number: RO-270/81-18 Report Date: December 21, 1981 Occurrence Date: November 23, 1981 Facility: Oconee Units 2 and 3, Seneca, South Carolina Identification of Occurrence: Loss of Prime to the Emergency Condenser Circulating Water System Conditions Prior to Occurrence: Oconee 2 - 75% FP-

! Oconee 3 - 100% FP Description of Occurrence:

i l At approximately 1011 hours0.0117 days <br />0.281 hours <br />0.00167 weeks <br />3.846855e-4 months <br /> on November 23, 1981, while attempting to vent l the Condenser Circulating Water (CCW) lines by use of the CCW emergency i discharge valves, CCW-1 through CCW-6, the CCW discharge valve to the l

Keowee tailrace, valve CCW-8, was inadvertently opened and then faile'd to close, thus resulting in a loss of prime for the CCW Emergency Cooling Discharge line.

Apparent Cause of Occurrence:

The primary cause of the incident was a training deficiency. The training given only gives direction on -Emergency System actuation, and does not give direction on how to return the system to normal. The loss of prime occurred atter the sytem.had actuated. It should also be noted that CCW-8 will not close with open indication on CCW-1 through CCW-6. If training had been given on " Return to Normal after Actuation", the loss of prime would not have taken place.

The secondary cause of the incident was procedural deficiency. Operating procedures should be written such that when performed, emergency systems would not be challenged. The procedure used a note to indicate possible Emergency System actuation. The note gives no direction on how to Return to Normal and also implies that all valves must be open to give open indication on CCW-1 through CCW-6.

Analysis of Occurrence:

Unit I was at cold shutdown at the time of the incident. Units 2 and 3 began shutdown sequence, as required by the Technical Specification, immediately after discovery of the incident. Since normal cooling was  ;

available to all units through the condenser, the health and safety of the public were not compromised by this incident.

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o -o. Corrective Action:

Units _2 and 3 began-shutdown sequence after discovery of the incident.

Valve CCW-8 was manually closed and the Emergency Discharge line was reprimed. Subsequent testing of valve operation could find no problems and all functions were normal. The valve was returned to service.

A training package on " Return to Normal after Actuation" of CCW-8 will be generated and given to all operations personnel which shows correct action to prevent loss of prime when returning the system to normal. A letter will be drafted to Operator Training Department.to include'keturn to Normal af ter Actuation"of CCW-8 in ISS System Training and Operator License Training. The procedure for priming the Emergency Discharge Line will be changed so that it does not challenge the Emergency System operation while priming the Emergency Discharge Line.