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On 2/18/2004 at 1547 ET, Unit 2 was in the … On 2/18/2004 at 1547 ET, Unit 2 was in the Run mode at a power level of approximately 2772 CMWT (98.8% rated thermal power). At that time, an 8 inch Plant Service Water (PSW) pipe was being cut in support of implementation of a planned design change. Despite precautions taken some water drained onto the Unit 2 '2C' Emergency Diesel Generator (DG) relay panel 2H21-P232 which caused the '2C' DG to start from an apparent invalid signal. The DG did not tie to the bus, and the bus remained energized throughout the event. Licensed Operations personnel shut down the DG by 1604 ET on 2/18/2004, and the DG's mode switch was left in the test position until the completion of trouble shooting activities.</br></br>This event resulted from personnel failing to anticipate the volume of water that could be released from the pipe cut due to the combination of the pipe configuration and sediment build-up in the pipe. A contributing cause was failure to protect relay panel 2H21-P232 from any potential water damage.</br></br>Troubleshooting and repair activities were completed; and the Operability Surveillance (34SV-R43- 006-2S, DIESEL GENERATOR 2C SEMI-ANNUAL TEST) was completed on 2/20/2004 at 0505 ET.</br></br>Procedural guidance is being incorporated into the appropriate plant procedures to ensure that electrical equipment is protected when breaching nearby systems.s protected when breaching nearby systems. +
February 18, 2004 +
On 2/18/2004 at 1547 ET, Unit 2 was in the … On 2/18/2004 at 1547 ET, Unit 2 was in the Run mode at a power level of approximately 2772 CMWT (98.8% rated thermal power). At that time, an 8 inch Plant Service Water (PSW) pipe was being cut in support of implementation of a planned design change. Despite precautions taken some water drained onto the Unit 2 '2C' Emergency Diesel Generator (DG) relay panel 2H21-P232 which caused the '2C' DG to start from an apparent invalid signal. The DG did not tie to the bus, and the bus remained energized throughout the event. Licensed Operations personnel shut down the DG by 1604 ET on 2/18/2004, and the DG's mode switch was left in the test position until the completion of trouble shooting activities.</br></br>This event resulted from personnel failing to anticipate the volume of water that could be released from the pipe cut due to the combination of the pipe configuration and sediment build-up in the pipe. A contributing cause was failure to protect relay panel 2H21-P232 from any potential water damage.</br></br>Troubleshooting and repair activities were completed; and the Operability Surveillance (34SV-R43- 006-2S, DIESEL GENERATOR 2C SEMI-ANNUAL TEST) was completed on 2/20/2004 at 0505 ET.</br></br>Procedural guidance is being incorporated into the appropriate plant procedures to ensure that electrical equipment is protected when breaching nearby systems.s protected when breaching nearby systems. +
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April 13, 2004 +
February 18, 2004 +
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