ENS 44051

v t e ENS Event
07:35 Jan 24, 2008
Title	60 Day Report - Invalid Actuation Of The Nuclear Service Water System
Event Description	This 60-day optional report as allowed by 10 CFR 50.73(a)(1), is being made under the reporting requirement in 10 CFR 50.73 (a)(2)(iv)(A) to describe an invalid actuation of a specified system, specifically the Nuclear Service Water System (NSWS). While performing changeout of a Nuclear Service Water (RN) current module, there was an unexpected auto swap from the normal heat sink (Lake Wylie) to the ultimate heat sink {Standby Nuclear Service Water Pond (SNSWP)} occurred and the system responded as designed. Work was stopped when notified by Operations. This event occurred when technicians attempted to isolate power to the module prior to replacing. Unable to do so, they decided to perform a changeout under hot conditions. While tracing power utilizing wire tabs, the technicians did not identify that removing wire from terminal 12 of the module disturbs the power path to other channels. The channel associated with the bad module remained in the trip condition throughout, and when power to other channels was disturbed, the logic for a swap from the normal heat sink to the ultimate heat sink was completed and the automatic swap occurred as designed. This event was entered into the site corrective action program for evaluation. The licensee will inform local and state agencies and has informed the NRC Resident Inspector.

ENS 44051 +/-
Where
Catawba South Carolina (NRC Region 2)
Reporting

10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation
Time - Person (Reporting Time:+1132.52 h47.188 days <br />6.741 weeks <br />1.551 months <br />)
Opened:	Tom Poetzsch 11:06 Mar 11, 2008
NRC Officer:	Steve Sandin
Last Updated:	Mar 11, 2008
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v • d • e

v t e Emergency Notification System
Catawba with 10 CFR 50.73(a)(1), Submit an LER
WEEKMONTHYEAR2013-05-28T17:39:00 [Table view]
[ENS list for Catawba]

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