ENS 49575

v t e ENS Event
05:01 Nov 24, 2013
Title	Momentary Loss of Reactor Building Ventilation
Event Description	On 11/24/2013 at 00:00:54 seconds [EST], Reactor Building ventilation tripped due to low outside air temperature. At 00:01:42 seconds, Secondary Containment Differential pressure went positive, with a maximum of +0.08 inches WC [water column]. This is a loss of Secondary Containment function. At 00:02:30 seconds, Standby Gas Treatment System was started and Secondary Containment pressure then decreased to <0 inches WC at 00:03:18 seconds. All the above data parameters were taken from the Division 2 Reactor Building Differential pressure recorder. Secondary Containment pressure is stable with differential pressure negative <-0.30 inches WC. The loss of Secondary Containment function is reportable under 10CFR 50.72(b)(3)(v)(c) as an event or condition that could have prevented the fulfillment of a safety function needed to control the release of radioactive material. Technical Specification requirement are to maintain secondary containment pressure <-0.125 WC. No actual radiation release occurred during the event. The licensee notified the NRC Resident Inspector.

ENS 49575 +/-
Where
Fermi Michigan (NRC Region 3)
Reporting

10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material
Time - Person (Reporting Time:+-2.12 h-0.0883 days <br />-0.0126 weeks <br />-0.0029 months <br />)
Opened:	Mark Eghigian 02:54 Nov 24, 2013
NRC Officer:	Mark Abramovitz
Last Updated:	Nov 24, 2013
49575 - NRC Website
v • d • e

v t e Emergency Notification System
Fermi with 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material
WEEKMONTHYEAR2021-10-14T17:20:00 [Table view]
[ENS list for Fermi]

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