ENS 46467

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v t e ENS Event
20:04 Oct 28, 2010
Title	Invalid Actuation of the "B" Emergency Service Water (Esw) Pump
Event Description	Text provided by the licensee. Quotations omitted for readability. Report Type: This 60-day telephone notification is being made under 10 CFR 50.73(a)(2)(iv)(A) and 10 CFR 50.73(a)(1). Description: On October 28, 2010, during the performance of MST I0073, "Train 'B' 18 Month Manual Reactor Trip, Solid State Protection System Actuation Logic & Master Relay Test", two sequential errors resulted in the inappropriate activation of the 'B' ESW pump. During night shift on October 27/28th, the Master Relay Selector Switch was not returned to the required OFF position. This caused day shift to find one of the two general warning lights to be lit. During the troubleshooting for the light, a technician discovered the Master Relay Selector Switch out of the expected OFF position as required by the procedure. A technician moved the switch to the OFF position outside of procedural guidance, resulting in the partial activation of the Reactor Protection System, including the 'B' ESW pump. The plant was in Mode 6 due to refueling outage 16 during the event. Actual plant conditions and parameters did not exist that required an automatic start of the 'B' ESW Pump. Therefore, this actuation is classified as invalid. The system started and functioned successfully. This invalid actuation was entered into the corrective action program as NCR 430289. Cause: Poor performance of task by the individual. The licensee informed the NRC Resident Inspector.

ENS 46467 +/-
Where
Harris North Carolina (NRC Region 2)
Reporting

10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation
Time - Person (Reporting Time:+979.78 h40.824 days <br />5.832 weeks <br />1.342 months <br />)
Opened:	Kimberly Bass 16:51 Dec 8, 2010
NRC Officer:	Steve Sandin
Last Updated:	Dec 8, 2010
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v • d • e

v t e Emergency Notification System
Harris with 10 CFR 50.73(a)(1), Submit an LER
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