ENS 42400
ENS Event | |
|---|---|
10:55 Mar 9, 2006 | |
| Title | Technical Specification 3.8.1.1 Entry Due to Loss of Unit 3 Startup Transformer |
| Event Description | While the Unit 3 Startup Transformer was inoperable for planned maintenance, it was discovered that both the 3A and 3B Emergency Diesel Generators were inoperable. The Emergency Diesel Generators were inoperable due to a configuration that resulted in the Emergency Diesel Generators being in the Droop mode versus the Isochronous mode. This configuration was improperly established when offsite power was supplied to Unit 3 via the Main and Auxiliary Transformers (Backfeed).
Upon discovery, jumpers were installed to place both [Unit 3] Emergency Diesel Generators in the proper Isochronous mode correcting this condition at 0615 on March 9, 2006. Unit 4 was identified to be in a condition where one of its required Startup Transformers [from Unit 3] and one of its required Emergency Diesel Generators [from Unit 3] were out of service. Both [Unit 3] Emergency Diesel Generators were restored to an operable condition approximately twenty (20) minutes after discovery. Technical Specification 3.8.1.1 Action c entered due to inoperable Unit 3 Startup Transformer and one inoperable Unit 3 EDG and requires a 4 hour4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> notification report to the NRC. The licensee notified the NRC Resident Inspector.
As reported in Event Notification 42400, with Unit 4 at 100% power in Mode 1, and the Unit 3 Startup Transformer out of service for planned maintenance, both the 3A and 3B Emergency Diesel Generators were declared inoperable due to a configuration that placed both Emergency Diesel Generators in the droop mode versus the normal isochronous mode. This placed Unit 4 in a Technical Specification Action Statement for one of its required Startup Transformers and one of its required Emergency Diesel Generators being inoperable. This EN 42400 supplement documents that, although the 3A and 3B Emergency Diesel Generators were declared inoperable, the droop mode condition is bounded within previous analyses that demonstrate that the Emergency Diesel Generators and required electrical loads would operate to satisfactorily perform their safety function at the resulting reduced electrical frequency. Refer [to] Turkey Point LER 2004-001-01, dated 10/18/04. The licensee notified the NRC Resident Inspector. Notified R2DO (Fredrickson). |
| Where | |
|---|---|
Turkey Point  Florida (NRC Region 2) | |
| Reporting | |
| Other Unspec Reqmnt | |
| Time - Person (Reporting Time:+-1.58 h-0.0658 days <br />-0.0094 weeks <br />-0.00216 months <br />) | |
| Opened: | Michael Murphy 09:20 Mar 9, 2006 |
| NRC Officer: | Jeff Rotton |
| Last Updated: | Mar 9, 2006 |
| 42400 - NRC Website
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Unit 4 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 527912017-06-06T21:51:0006 June 2017 21:51:00
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