ENS 52416

v t e ENS Event
04:40 Dec 8, 2016
Title	Control Room Fan Switch Mis-Positioned
Event Description	At 2240 [CST], December 16, 2016, it was identified that HV-SW-(SF-C-1A)(CS), control switch for supply fan SF-C-1A for HV-FAN-(SF-C-1A), main control room A/C unit supply fan had been inadvertently been placed to OFF, leaving no supply fan running as required to maintain CREFS [Control Room Emergency Filtration System] operable. This was discovered following the performance of 6.1HV.302 Essential Control Building Ventilation Functional Test (DIV 1). It is estimated that the control switch was placed in OFF at approximately 2220 during preparation of 6.1HV.302 per S.O.P. 2.2.38. Time of discovery was 2240. This resulted in an unplanned LCO entry for the CREFS. CREFS was subsequently declared inoperable and LCO 3.7.4 Condition A was entered, with required action A.1 to restore CREFS to operable status within 7 days. The switch was restored to its required position at 2247 and CREFS was subsequently declared operable and the referenced LCO was exited. CR-CNS-2016-08744 was written to document the unplanned inoperability." The NRC Resident Inspector has been notified.

ENS 52416 +/-
Where
Cooper Nebraska (NRC Region 4)
Reporting

10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident
Time - Person (Reporting Time:+-2.18 h-0.0908 days <br />-0.013 weeks <br />-0.00299 months <br />)
Opened:	Fred Schizas 02:29 Dec 8, 2016
NRC Officer:	Karl Diederich
Last Updated:	Dec 8, 2016
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v • d • e

v t e Emergency Notification System
Cooper with 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident
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