ENS 44909

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v t e ENS Event
15:23 Mar 16, 2009
Title	Manual Trip Due to Failure of Technical Specification Required Fuel Thermocouple
Event Description	The licensee provided an informational call to inform the NRC Operations Center that it had manually tripped the research reactor from approximately 75% power (750 KW) due to the failure of a core fuel thermocouple that provides a reactor trip function. The technical specifications for the reactor require that two fuel centerline temperature thermocouples that provide a reactor trip function be available while the reactor is operating. The two fuel centerline thermocouples were confirmed to be functioning properly during a pre-startup surveillance earlier this morning. While at power the operators noticed fluctuations in one of the two thermocouple readouts. After about 4 minutes, it was concluded that one of the thermocouples was not functioning properly and the reactor was manually tripped to be in compliance with the technical specification action statement. The licensee was within technical specifications as soon as the reactor was tripped. The reactor did not trip automatically with the failure of the thermocouple because the failed thermocouple was providing a low temperature input into the reactor protection logic. There were no other issues with the research reactor and the licensee noted that it was not required to make an immediate notification to the NRC Operations Center per its license. The licensee had also notified the NRC inspector for this facility (Pat Isaac) of this event.

ENS 44909 +/-
Where
Armed Forces Radiobiology Rsch Inst Bethesda, Maryland (NRC Region 1)
License number:	R-84
Reporting

Information Only
Time - Person (Reporting Time:+-1.48 h-0.0617 days <br />-0.00881 weeks <br />-0.00203 months <br />)
Opened:	Steve Miller 13:54 Mar 16, 2009
NRC Officer:	Bill Huffman
Last Updated:	Mar 16, 2009
44909 - NRC Website
v • d • e

v t e Emergency Notification System
Armed Forces Radiobiology Rsch Inst with Information Only
WEEKMONTHYEAR2009-03-16T15:23:00 [Table view]
[ENS list for Armed Forces Radiobiology Rsch Inst]

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