ENS 46784

v t e ENS Event
11:00 Apr 24, 2011
Title	Violation of Technical Specification 3.2.3, Reactor Protection System
Event Description	During a committee review, it was determined that during reactor operations on 4/24/11, the reactor was in operation when it became xenon precluded. Technical Specifications require two period monitoring channels in service during power operations. Because of xenon, one period monitor was indicating below scale and was considered inoperable. When the reactor operator identified the condition, he notified the reactor supervisor who ordered the operator to shutdown the reactor. The reactor operated in this condition for approximately 30 minutes. The licensee notified their Project Manager who advised them to notify the NRC Operations Center. * * RETRACTION FROM JOHN BERNARD TO HOWIE CROUCH ON 4/27/11 AT 1653 EDT * * * Upon further review, it was determined that since the reactor was subcritical at the time this event occurred, Technical Specification 3.2.3 was not applicable. Therefore, the licensee has retracted this event. R1DO (Schmidt) and NRR (Adams) were notified.

ENS 46784 +/- *RETRACTED*
Where
Massachusetts Institute Of Tech Cambridge, Massachusetts (NRC Region 1)
License number:	R-37
Reporting

Non
Time - Person (Reporting Time:+29.7 h1.238 days <br />0.177 weeks <br />0.0407 months <br />)
Opened:	John Bernard 16:42 Apr 25, 2011
NRC Officer:	Howie Crouch
Last Updated:	Apr 27, 2011
46784 - NRC Website
v • d • e

v t e Emergency Notification System
Massachusetts Institute Of Tech with Non
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