ENS 47209

v t e ENS Event
03:21 Aug 28, 2011
Title	Shutdown Cooling Temporarily Isolated
Event Description	In accordance with 10 CFR 50.72 (b)(3)(v)(B) this event notification is being made to report an event that could have prevented the fulfillment of the safety function to remove residual heat. On August 27, 2011, following refueling, the plant was shutdown in Mode 4 with reactor coolant temperature being maintained 100-120 degrees F. Reactor coolant temperature was being controlled with RHR B operating in the Shutdown Cooling mode. At 2021 [EDT], an equipment failure caused a loss of Reactor Protection System (RPS) B resulting in a closure of RHR-V-9 (RHR Shutdown Cooling Inboard Isolation Valve), interrupting shutdown cooling flow. Operators transferred RPS B to the alternate power supply and restored RHR B to shutdown cooling. Shutdown cooling was out of service for 34 minutes. During the 34 minute interruption of shutdown cooling, reactor coolant temperature rose from 107 degrees F to 111 degrees F. Following restoration of shutdown cooling, reactor coolant temperature was restored. All containment isolations resulting from the loss of RPS B occurred as expected. Further investigation is ongoing to determine the cause of the equipment failure that caused the loss of RPS B. The licensee notified the NRC Resident Inspector.

ENS 47209 +/-
Where
Columbia Washington (NRC Region 4)
Reporting

10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat
Time - Person (Reporting Time:+-0.67 h-0.0279 days <br />-0.00399 weeks <br />-9.17766e-4 months <br />)
Opened:	Michael Stodick 02:41 Aug 28, 2011
NRC Officer:	Pete Snyder
Last Updated:	Aug 28, 2011
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v • d • e

v t e Emergency Notification System
Columbia with 10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat
WEEKMONTHYEAR2024-01-18T20:04:00 [Table view]
[ENS list for Columbia]

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