ENS 45170

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v t e ENS Event
17:20 Jun 27, 2009
Title	Auxiliary Building Gas Treatment System Rendered Inoperable
Event Description	On June 27, 2009, Plant Operations was starting up the U2 [Unit 2] Auxiliary Building General Ventilation System upon completion of U2 damper maintenance. During startup of the U2 Auxiliary Building Ventilation System, the operator started the U2 General Exhaust fan followed by the startup of the U2 General Supply fan. During the time span of less than 1 minute, when the U2 General Exhaust fan was running but before the U2 General Supply fan was running, the differential pressure condition across a set of Auxiliary Building Secondary Containment Enclosure (ABSCE) doors caused the doors to come off of the tracks and therefore created an ABSCE breach. A breach of this magnitude renders both trains of Auxiliary Building Gas Treatment System (ABGTS) inoperable. Upon identification of the failed doors at 1320 EDT on June 27, 2009 the plant entered TS Condition 3.7.12.B for 2 trains of ABGTS being inoperable. Repairs to re-establish the integrity of the ABSCE were immediately initiated and TS Condition 3.7.12.B was exited at 1649 EDT, approximately 3 and 1/2 hours later. This event is reportable under 10 CFR 50.72(b)(3)(v)(C) and (D) as a condition that could have prevented the safety function of structures or systems that are needed to : (C) Control the release of radioactive material; or (D) Mitigate the consequences of an accident. The licensee has notified the NRC Resident Inspector.

ENS 45170 +/-
Where
Watts Bar Tennessee (NRC Region 2)
Reporting

10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident
Time - Person (Reporting Time:+0.63 h0.0263 days <br />0.00375 weeks <br />8.62974e-4 months <br />)
Opened:	Billy Johnson 17:58 Jun 27, 2009
NRC Officer:	John Knoke
Last Updated:	Jun 27, 2009
45170 - NRC Website
v • d • e

v t e Emergency Notification System
Watts Bar with 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material
WEEKMONTHYEAR2021-03-01T20:11:00 [Table view]
[ENS list for Watts Bar]

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