ENS 45110

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v t e ENS Event
23:05 May 27, 2009
Title	Both Trains of Auxiliary Building Gas Treatment System Rendered Inoperable
Event Description	On May 27, 2009, Plant Operations was shutting down the Auxiliary Building General Ventilation system [ABGTS] as a compensatory measure in response to an historical deficiency that was identified in the surveillance procedure for conducting TS SR 3.7.12.4. The building's general ventilation was being shut down to place the plant in a known tested configuration to ensure continued safe operation while plans were being developed to properly perform SR 3.7.12.4. While shutting down the building's ventilation system, the operator shut down the building's supply fans followed by the shut down of building's exhaust fans. This sequence resulted in an unacceptable differential pressure condition across a set of Auxiliary Building Secondary Containment Enclosure (ABSCE) doors. Upon identification of the failed doors at 1905 EDT on May 27, 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 2239 EDT, approximately 3 and 1/2 hours later. The reportability of this condition was not recognized at the time of this event. Based upon a review subsequent to the event on June 1, 2009, this event was determined to be 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 45110 +/-
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:+115.02 h4.793 days <br />0.685 weeks <br />0.158 months <br />)
Opened:	Gregory Evans 18:06 Jun 1, 2009
NRC Officer:	Howie Crouch
Last Updated:	Jun 1, 2009
45110 - 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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