ENS 44051
ENS Event | |
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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. |
Where | |
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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 |
44051 - NRC Website
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Unit 1 | |
---|---|
Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
Unit 2 | |
---|---|
Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
WEEKMONTHYEARENS 491952013-05-28T17:39:00028 May 2013 17:39:00
[Table view]10 CFR 50.73(a)(1), Submit an LER 60 Day Report - Invalid Actuation of Specified System ENS 487062012-12-22T06:42:00022 December 2012 06:42:00 10 CFR 50.73(a)(1), Submit an LER 60 Day Report - Invalid Actuation of the Afw System ENS 443522008-06-09T20:31:0009 June 2008 20:31:00 10 CFR 50.73(a)(1), Submit an LER 60 Day Report - Invalid Actuation of Main Steam Isolation System ENS 440512008-01-24T07:35:00024 January 2008 07:35:00 10 CFR 50.73(a)(1), Submit an LER 60 Day Report - Invalid Actuation of the Nuclear Service Water System ENS 428732006-08-08T20:17:0008 August 2006 20:17:00 10 CFR 50.73(a)(1), Submit an LER 60 Day Report - Invalid Actuation of Auxiliary Feed Pump 2B ENS 411322004-08-22T08:50:00022 August 2004 08:50:00 10 CFR 50.73(a)(1), Submit an LER 60 Day Report - Invalid Actuation of Specified System 2013-05-28T17:39:00 | |