ENS 49574

v t e ENS Event
01:20 Nov 23, 2013
Title	Control Room Hvac Inoperable
Event Description	This report is being made pursuant to 10CFR50.72(b)(3)(v)(D), Event or Condition that could have prevented fulfillment of a Safety Function needed to Mitigate the Consequences of an Accident. While the 'A' Train of Control Room HVAC was inoperable and out of service for emergent repairs due to a Freon leak, the 'B' Train of Auxiliary Electric Room HVAC became inoperable due to a failure of the Cooler Condenser Fan. The Main Control Room Envelope consists of the Main Control Room and the Auxiliary Electric Equipment Room. Both the Control Room HVAC and the Auxiliary Electric Equipment Room HVAC Systems are required to be Operable in the current Mode. This is a loss of safety function for a system that is intended to mitigate the consequences of an accident and is discussed in Chapter 6 of the UFSAR and is Tech Spec required and is Safety Related. Also, the system, structure, or component (SSC) is inoperable in a required mode in the Tech Spec Applicability and there is no redundant equipment in the same system that is operable. The Required actions of Tech Spec 3.7.5 were entered on 11/22/2013 at 1920 CST when the 'B' train became inoperable. Online Risk remains Green. The station is currently pursuing repairs to both trains. The NRC Resident Inspector has been notified by the licensee.

ENS 49574 +/-
Where
Lasalle Illinois (NRC Region 3)
Reporting

10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident
LER:	05000373/LER-2013-008
Time - Person (Reporting Time:+-1.35 h-0.0563 days <br />-0.00804 weeks <br />-0.00185 months <br />)
Opened:	Rudy Caputo 23:59 Nov 22, 2013
NRC Officer:	Daniel Mills
Last Updated:	Nov 23, 2013
49574 - NRC Website
v • d • e

v t e Emergency Notification System
LaSalle with 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident
WEEKMONTHYEAR2023-04-17T07:46:00 [Table view]
[ENS list for LaSalle]

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