ENS 47799

v t e ENS Event
19:52 Apr 2, 2012
Title	Initiation of Reactor Shutdown Required by Technical Specifications (Ts) 3.8.1.F
Event Description	On April 2, 2012, at 1452 hours0.0168 days <br />0.403 hours <br />0.0024 weeks <br />5.52486e-4 months <br />, Unit 1 received Panel 901-8 A7 U1 Emergency Diesel Generator (EDG) Trouble alarm. Equipment Operators were dispatched and the Unit 1 EDG was found running unloaded, without a generator field flash, and no auto start signal received. Troubleshooting identified that a 125 VDC ground had caused the Unit 1 EDG to start. As a result, the Unit 1 EDG was declared inoperable. At this time Unit 2 is in a refueling outage and the Unit 2 EDG is currently inoperable for repairs. Due to the inoperability of the Unit 1 and Unit 2 EDGs, at 2000 hours0.0231 days <br />0.556 hours <br />0.00331 weeks <br />7.61e-4 months <br /> a Reactor Shutdown was initiated on Unit 1 in accordance with TS 3.8.1.F. In addition, since the EDGs supply emergency power to both Unit's Standby Gas Treatment Systems (SBGTS), emergency power was unavailable to SBGTS; however, normal power supplies remained available. This notification is being made in accordance with 10 CFR 50.72(b)(2)(i), and in accordance with 10 CFR 50.72(b)(3)(v)(D). At 2151 hours0.0249 days <br />0.598 hours <br />0.00356 weeks <br />8.184555e-4 months <br />, the Unit 1 EDG was declared operable following repairs and successful operability testing. The NRC Resident Inspector has been informed.

ENS 47799 +/-
Where
Quad Cities Illinois (NRC Region 3)
Reporting

10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident
Time - Person (Reporting Time:+3.67 h0.153 days <br />0.0218 weeks <br />0.00503 months <br />)
Opened:	Brian Magnuson 23:32 Apr 2, 2012
NRC Officer:	Charles Teal
Last Updated:	Apr 2, 2012
47799 - NRC Website
v • d • e

v t e Emergency Notification System
Quad Cities with 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown
WEEKMONTHYEAR		Oprm Count Setpoint Discrepancy 2022-07-04T06:30:00 [Table view]
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