ENS 45216

v t e ENS Event
21:15 May 25, 2009
Title	Optional 60-Day Report of Invalid Specified System Actuation
Event Description	On May 25, 2009, at 1615, a Unit 3 control fuse failed open causing multiple containment isolation valves for the atmospheric sampling system and containment ventilation/purge systems to close on a loss of power to the logic system. No actual valid containment isolation signals were received or processed by the containment isolation logic. Since this was an invalid signal, a telephone notification to the NRC Operations Center may be provided within 60 days after discovery of the event instead of submitting a written Licensee Event Report. [10 CFR 50.73(a)(2)(iv)(A)]. This phone notification is being made in lieu of a written 60 day LER as allowed in 10 CFR 50.73(a)(1) to report the invalid actuation of multiple containment isolation valves that occurred as described above. The fuse is associated with the inboard containment isolation logic. This is considered a partial actuation and all components operated as expected. Troubleshooting identified that a relay failed and, in turn, had caused the fuse to open. The relay and fuse were replaced and the systems restored to their normal lineup. The NRC Resident has been informed that this notification is being made. No further notifications or reports will be issued.

ENS 45216 +/-
Where
Dresden Illinois (NRC Region 3)
Reporting

10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation
Time - Person (Reporting Time:+1362.2 h56.758 days <br />8.108 weeks <br />1.866 months <br />)
Opened:	Paul Salgado 15:27 Jul 21, 2009
NRC Officer:	Charles Teal
Last Updated:	Jul 21, 2009
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v • d • e

v t e Emergency Notification System
Dresden with 10 CFR 50.73(a)(1), Submit an LER
WEEKMONTHYEAR2013-11-17T16:00:00 [Table view]
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