Fire Safety Conditions Found at Prairie Island Nuclear Station

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Power Reactor Event Number: 47522
Facility: PRAIRIE ISLAND
Region: 3 State: MN
Unit: [ ] [2] [ ]
RX Type: [1] W-2-LP,[2] W-2-LP
NRC Notified By: DARRELL LAPCINSKI
HQ OPS Officer: VINCE KLCO
Notification Date: 12/13/2011
Notification Time: 19:43 [ET]
Event Date: 12/09/2011
Event Time: 11:59 [CST]
Last Update Date: 12/13/2011
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(ii)(B) – UNANALYZED CONDITION
Person (Organization):
BILLY DICKSON (R3DO)
Unit SCRAM Code RX CRIT Initial PWR Initial RX Mode Current PWR Current RX Mode
2 N Y 100 Power Operation 100 Power Operation

Event Text

UNANALYZED CONDITION- DEGRADED FIRE BARRIER BETWEEN FIRE AREAS

“A degraded fire barrier between Fire Area (FA) 118 (Bus 26 Room) and FA 128 (Bus 27 Room) has existed during the last three years. The top of the wall between the Bus 26 and Bus 27 room had a missing/degraded fire barrier. At the time of discovery on December 9, 2011 a fire watch was in place. However, it was determined that at various times during the last three years a fire watch was not established.

“Bus 27 has been conservatively aligned to Bus 26 to provide the required degree of separation for redundant safe shutdown trains (between Bus 26 and Bus 25). The fire watch will remain in place as a compensatory measure until the fire barrier is repaired.

“[The] NRC Resident [Inspector] has been informed.”

Source: NRC Event Notifications

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