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Dresden Nuclear Power Station, Units 2 and … Dresden Nuclear Power Station, Units 2 and 3, had been experiencing increasing trends in vibration levels on both Main Turbine Generators, bearings 9 and 10 since May 2004. Numerous efforts and reviews during the summer and fall of 2004 were not successful in resolving the vibration. Dresden Unit 3 entered a refueling outage in October 2004 and as part of the outage scope, the Main Turbine Generator was inspected. On October 31, 2004, the inspection identified that the Unit 3 Main Turbine Generator Rotor had a crack in the shaft near the rotor coupling. This finding resulted in the decision to remove Unit 2 from service and conduct an inspection of its rotor shaft. On November 1, 2004, a crack was identified on the Unit 2 rotor shaft. The Unit 2 crack was in the same general location and similar configuration as the Unit 3 crack.</br></br>These events are being reported as a Voluntary Licensee Event Report in accordance with the guidance contained in NUREG 1022, Revision 2, "Event Reporting Guidelines 10 CFR 50.72 and 50.73.</br></br>The root cause of these events was determined to be intermittent oscillating torsional loading on the generator rotor, which produced a torsional fatigue failure mode. The cause of the intermittent oscillating torsional loading is indeterminate. The cause and source of the intermittent oscillating torsional loading will be investigated through analytic modeling and data acquisition during plant operation.d data acquisition during plant operation. +
October 31, 2004 +
Dresden Nuclear Power Station, Units 2 and … Dresden Nuclear Power Station, Units 2 and 3, had been experiencing increasing trends in vibration levels on both Main Turbine Generators, bearings 9 and 10 since May 2004. Numerous efforts and reviews during the summer and fall of 2004 were not successful in resolving the vibration. Dresden Unit 3 entered a refueling outage in October 2004 and as part of the outage scope, the Main Turbine Generator was inspected. On October 31, 2004, the inspection identified that the Unit 3 Main Turbine Generator Rotor had a crack in the shaft near the rotor coupling. This finding resulted in the decision to remove Unit 2 from service and conduct an inspection of its rotor shaft. On November 1, 2004, a crack was identified on the Unit 2 rotor shaft. The Unit 2 crack was in the same general location and similar configuration as the Unit 3 crack.</br></br>These events are being reported as a Voluntary Licensee Event Report in accordance with the guidance contained in NUREG 1022, Revision 2, "Event Reporting Guidelines 10 CFR 50.72 and 50.73.</br></br>The root cause of these events was determined to be intermittent oscillating torsional loading on the generator rotor, which produced a torsional fatigue failure mode. The cause of the intermittent oscillating torsional loading is indeterminate. The cause and source of the intermittent oscillating torsional loading will be investigated through analytic modeling and data acquisition during plant operation.d data acquisition during plant operation. +
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January 19, 2005 +
October 31, 2004 +
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