ENS 48706

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v t e ENS Event
06:42 Dec 22, 2012
Title	60 Day Report - Invalid Actuation of the Afw 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 Auxiliary Feedwater (AFW) system. On December 22, 2012 at 0142, with Unit 1 in Mode 4, the 1A AFW pump automatically started due to failure to reset the signal created when the 1B Feedwater Pump was tripped for testing. The 1A feedwater pump was already in the 'tripped' condition when the 1B feedwater pump was tripped, resulting in an auto start signal being generated for the AFW system. Both trains of the AFW had the auto start defeat instated at the time of the testing of the 1B Feedwater pump, blocking the start signal. During subsequent alignment of the AFW for standby readiness, the auto start defeat was removed from the 1A AFW system without resetting the system to remove the signal generated during the 1B Feedwater pump testing, resulting in the actuation of the system. The 1B Feedwater Pump had been reset and was in service therefore the signal associated with the trip of both feedwater pumps was not consistent with the actual plant conditions at the time that the auto start defeat was removed from the 1A AFW system. Following the auto start of the 1A motor driven AFW pump, operators confirmed the 1A AFW train experienced a complete actuation and that the 1A AFW Pump and its associated valves functioned as designed. The pump was subsequently secured and the AFW system was returned to standby readiness. This event was entered into the site specific correction action program for resolution. The NRC Resident Inspector has been informed. The licensee will notify the states of North Carolina and South Carolina. Additionally the licensee will notify York, Gaston, and Mecklenburg County.

ENS 48706 +/-
Where
Catawba South Carolina (NRC Region 2)
Reporting

10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation
LER:	05000414/LER-2015-001
Time - Person (Reporting Time:+922.07 h38.42 days <br />5.489 weeks <br />1.263 months <br />)
Opened:	Jeffrey Cass 16:46 Jan 29, 2013
NRC Officer:	Charles Teal
Last Updated:	Jan 29, 2013
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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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