ENS 52771

v t e ENS Event
08:21 May 26, 2017
Title	Control Room Emergency Filtration System Inoperable
Event Description	On May 26, 2017 at 0321 [CDT], Control Room staff questioned air flow and differential pressure in the Main Control Room. The CREFS [control room emergency filtration system] booster fan discharges to the Control Room supply fan suctions. With supply fan flows questionable, reasonable assurance that CREFS would fulfill its safety function could not be established. Engineering confirmed CREFS system flow rate by testing and determined the actual flow was 802 cfm, below the required flow of 810 cfm. Based on this information, CREFS was declared inoperable. CREFS is a single train system. Per 10CFR50.72(b)(3)(v)(D), an 8-hour report is required due to the fact that, at the time of discovery, this condition could have prevented the fulfillment of the safety function of an SSC that is required to mitigate the consequences of an accident. The NRC Senior Resident Inspector will be informed. CREFS being out of service places the plant in a 7-day LCO shutdown action statement.

ENS 52771 +/-
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
LER:	05000298/LER-2017-003
Time - Person (Reporting Time:+3.83 h0.16 days <br />0.0228 weeks <br />0.00525 months <br />)
Opened:	Randy Kouba 12:11 May 26, 2017
NRC Officer:	Howie Crouch
Last Updated:	May 26, 2017
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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
WEEKMONTHYEAR2024-03-13T10:48:00 [Table view]
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