ML041940274

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Event Notification 39945 for Columbia Unit 2
ML041940274
Person / Time
Site: Columbia Energy Northwest icon.png
Issue date: 06/16/2003
From:
NRC Region 4
To:
References
39945, FOIA/PA-2004-0243
Download: ML041940274 (1)


Text

Event Notification Report for June 25, 2004 Page 1 of 1 U.S. Nuclear Regulatory Commission Operation Center Power Reactor Event Number:39945 Facility:COLUMBIA GENERATING STATION Notification DateD6/1 6/2003 Region:4 State: WA Notification Time2O:36 [EST]

Unit: [2] Event Date:06/16/2003 RXType:[2] GE-5 Event Time:13:30 [PDT]

NRC Notified By:SCOTT BOYNTON Last Update DateD6/16/2003 HO OPS Officer: STEVE SANDIN Emergency Class: NON EMERGENCY Person (Organization):

10 CFR Section: DAVID GRAVES (R4) 50.72(b)(3)(v)(B) - POT RHR INOP Event Text UNEXPECTED ISOLATION SIGNAL DURING TESTING WHICH RESULTED INA MOMENTARY LOSS OF SHUTDOWN COOLING

'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 June 16, 2003, the plant was shutdown in Mode 4 with reactor vessel level being maintained between 60-120 inches. Operators were performing surveillance testing on the manual pushbutton Isolation logic to the Nuclear Steam Supply Shutoff System when an unexpected general outboard isolation signal was received. This resulted Inthe closure of RHR-V-8 (RHR shutdown cooling outboard containment isolation valve) and the interruption of shutdown cooling. Reactor Recirculation Pump B remained in service providing forced flow through the reactor core. Operators restored from the surveillance, reset the isolation signal, and reopened RHR-V-8. Shutdown cooling was restored 12 minutes after RHR-V-8 went closed. Reactor vessel level and temperature remained stable during the period shutdown cooling was not in service.'

The licensee's Incident and review board determined that the procedure was deficient in that it did not alert operators to the isolation signal which functioned as required. The licensee will Inform the NRC resident inspector.

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