ENS 43416

v t e ENS Event
01:03 Jun 11, 2007
Title	High Pressure Core Spray Declared Inoperable Due to Failed Inverter
Event Description	At 2003 on 6/10/07, the division 3 Nuclear System Protection System (NSPS) inverter power supply failed for unknown reasons. As a result of this failure, the High Pressure Core Spray (HPCS) system has been declared inoperable. This is a failure of a single train safety system and is reportable under 10 CFR 50.72(b)(3)(v)(D). Troubleshooting has been initiated to determine the cause of this failure. The licensee notified the NRC Resident Inspector. * * RETRACTION ON 07/6/07 AT 1639 EDT FROM TOM CHALMERS TO MARK ABRAMOVITZ * * * This event is being retracted. An evaluation was performed and it was determined that no loss of safety function occurred following the failure of the Division 3 NSPS Inverter. The investigation determined that a circuit board failed on the inverter causing a blown fuse. The inverter was found in the reverse transfer position and AC power was automatically transferred to its alternate source, supplying its Division 3 loads. The High Pressure Core Spray system remained fully capable of performing its safety function to start and inject under both LOOP and LOCA conditions. The licensee will notify the NRC Resident Inspector. Notified the R3DO (Lanksbury).

ENS 43416 +/- *RETRACTED*
Where
Clinton Illinois (NRC Region 3)
Reporting

10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident
Time - Person (Reporting Time:+0.23 h0.00958 days <br />0.00137 weeks <br />3.15054e-4 months <br />)
Opened:	Matt Evans 01:17 Jun 11, 2007
NRC Officer:	Jason Kozal
Last Updated:	Jul 6, 2007
43416 - NRC Website
v • d • e

v t e Emergency Notification System
Clinton with 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident
WEEKMONTHYEAR2020-11-17T01:18:00 [Table view]
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