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On April 1, 2007, at approximately 1528 Ea … On April 1, 2007, at approximately 1528 Eastern Daylight Time (EDT), Unit 1 entered Mode 3 in accordance with Required Action H.1 of Technical Specification (TS) 3.8.1, "AC Sources - Operating;" Mode 4 was entered at approximately 1215 EDT on April 2, 2007. The TS required shutdown was due to inoperability of emergency diesel generator (EDG) 4, which was removed from service on March 25, 2007, for planned maintenance. Unit 2 was in Mode 4, having been previously shutdown on March 3, 2007, for refueling. This event is being reported in accordance with 10 CFR 50.73(a)(2)(i)(A), due to the completion of a plant shutdown required by the plant's TSs.</br></br>The direct cause of the TS required shutdown of Unit 1 was the inability to return EDG 4 to operable status within the seven day completion time of Required Action D.4 of TS 3.8.1. The extended out-of-service time was due to multiple equipment issues, including two failed refurbished governors and latent design problems discovered during the Allen-Bradley relay replacements only after extensive post-maintenance testing. Each individual equipment issue was manageable within the allowed outage time, but the number and sequence of discovery was such that the cumulative effect of these issues precluded EDG 4 recovery within the allowed out-of-service time.ry within the allowed out-of-service time. +
On April 1, 2007, at approximately 1528 Ea … On April 1, 2007, at approximately 1528 Eastern Daylight Time (EDT), Unit 1 entered Mode 3 in accordance with Required Action H.1 of Technical Specification (TS) 3.8.1, "AC Sources - Operating;" Mode 4 was entered at approximately 1215 EDT on April 2, 2007. The TS required shutdown was due to inoperability of emergency diesel generator (EDG) 4, which was removed from service on March 25, 2007, for planned maintenance. Unit 2 was in Mode 4, having been previously shutdown on March 3, 2007, for refueling. This event is being reported in accordance with 10 CFR 50.73(a)(2)(i)(A), due to the completion of a plant shutdown required by the plant's TSs.</br></br>The direct cause of the TS required shutdown of Unit 1 was the inability to return EDG 4 to operable status within the seven day completion time of Required Action D.4 of TS 3.8.1. The extended out-of-service time was due to multiple equipment issues, including two failed refurbished governors and latent design problems discovered during the Allen-Bradley relay replacements only after extensive post-maintenance testing. Each individual equipment issue was manageable within the allowed outage time, but the number and sequence of discovery was such that the cumulative effect of these issues precluded EDG 4 recovery within the allowed out-of-service time.ry within the allowed out-of-service time. +
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