ENS Event | |
|---|---|
02:12 Nov 5, 2015 | |
| Title | Information Only - Unit 4 Technical Specification Entry Due to Loss of Unit 3 Startup Transformer During Unit 3 Outage |
| Event Description | This is a non-emergency, information only notification to the NRCOC. Plant conditions are as follows: Unit 3 is de-fueled and Unit 4 is in Mode 1 [At 100 percent power]. The Unit 3 Startup transformer is INOPERABLE due to preplanned maintenance. The 3B Emergency Diesel Generator (EDG) became INOPERABLE due to loss of all 480V vital AC load centers on Unit 3.
With Unit 4 in Mode 1, Technical Specification [TS] 3.8.1.1.c requires a 4-hour report to the NRC due to inoperability of 1 of 3 required EDGs onsite, concurrent with inoperability of a required Startup transformer. This report is for informational purposes only and is not required by 10CFR50.72/73. Spent Fuel Pool Cooling at Unit 3 remains available via 3B SFP Cooling Pump which is powered from Unit 4. The loss of the Unit 3 480V AC load centers is still under investigation. TS 3.8.1.1.c requires Unit 4 to exit the TS action statement in 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> or shutdown. To exit this TS, no two battery chargers may be powered from the same motor control center. The 480V vital AC load centers for Unit 3 must be restored since Unit 4 requires at least one train from Unit 3 480V AC load centers. The licensee is in the process of performing those actions. The licensee notified the NRC Resident Inspector. |
| Where | |
|---|---|
Turkey Point  Florida (NRC Region 2) | |
| Reporting | |
| Information Only | |
| Time - Person (Reporting Time:+-1.38 h-0.0575 days <br />-0.00821 weeks <br />-0.00189 months <br />) | |
| Opened: | Dirk Drinkard 00:49 Nov 5, 2015 |
| NRC Officer: | Jeff Rotton |
| Last Updated: | Nov 5, 2015 |
| 51515 - NRC Website
Loading map... | |
Unit 4 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 515152015-11-05T02:12:0005 November 2015 02:12:00
[Table view]Information Only Information Only - Unit 4 Technical Specification Entry Due to Loss of Unit 3 Startup Transformer During Unit 3 Outage ENS 418292005-07-08T23:15:0008 July 2005 23:15:00 Information Only Startup Transformers Declared Inoperable Based on Potential Undervoltage Condition 2015-11-05T02:12:00 | |