ENS 42660
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ENS Event | |
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10:20 Jun 22, 2006 | |
Title | 24 Hour License Condition Report of Operation in a Condition Prohibited by Technical Specification |
Event Description | At 0620 today, FPL Energy Seabrook discovered that the plant was in it condition prohibited by the technical specifications. At approximately 1900 yesterday, June 21, one of the two train-B vital battery chargers was removed from service, rendering the charger inoperable. This condition went unrecognized until 0620 this morning (June 22). Seabrook Station Technical Specification 3.8.2.1 permits two hours to restore a battery Changer to operable status, otherwise, the plant must shutdown to hot standby within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and cold shutdown within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />. In this event, the train-B full-capacity battery charger was inoperable for approximately 12.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br />, exceeding the time permitted by the technical specifications. During the period the charger was inoperable, the redundant battery charger in train B and both train-A battery chargers remained in service and operable. This notification is being made as a 24-hour report in accordance with license condition 2.G of the Seabrook Station operating license.
Investigation into the circumstances of the event are ongoing. The normal battery charger had been removed from service for normal maintenance and testing. A backup battery charger was placed on the battery which permitted the licensee to continue normal plant operations without entering the two hour TS LCO for 3.8.2.1. During the maintenance and testing of the primary battery charger, the backup battery charger was also rendered inoperable resulting in no battery charger for the affected battery bank. The licensee stated that at 0726 EDT on 6/22/06, the battery charger was restored to service and the technical specification exited. The licensee notified the NRC Resident Inspector. |
Where | |
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Seabrook New Hampshire (NRC Region 1) | |
Reporting | |
Other Unspec Reqmnt | |
Time - Person (Reporting Time:+4.13 h0.172 days <br />0.0246 weeks <br />0.00566 months <br />) | |
Opened: | Dennis Bemis 14:28 Jun 22, 2006 |
NRC Officer: | Bill Huffman |
Last Updated: | Jun 22, 2006 |
42660 - NRC Website
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Unit 1 | |
---|---|
Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
WEEKMONTHYEARENS 457382010-02-26T04:15:00026 February 2010 04:15:00
[Table view]Other Unspec Reqmnt Discovery of an After-The-Fact Unusual Event ENS 426842006-06-30T23:49:00030 June 2006 23:49:00 Other Unspec Reqmnt 24 Hour License Condition Report - Main Steam Isolation Valve Inoperable Greater than 4 Hours ENS 426602006-06-22T10:20:00022 June 2006 10:20:00 Other Unspec Reqmnt 24 Hour License Condition Report of Operation in a Condition Prohibited by Technical Specification ENS 423972006-03-08T13:00:0008 March 2006 13:00:00 Other Unspec Reqmnt 24-Hour Condition of License Report Due to Failure to Submit Ts Required Exposure Report ENS 421782005-11-30T08:24:00030 November 2005 08:24:00 Other Unspec Reqmnt Inverter Inoperable for Greater than Allowed Time Per Technical Specifications ENS 418242005-07-07T14:17:0007 July 2005 14:17:00 Other Unspec Reqmnt License Condition Report Due to Exceeding Technical Specification Inoperability Time ENS 415432005-03-29T19:00:00029 March 2005 19:00:00 Other Unspec Reqmnt 24 - Hr Condition of License Report Due to T.S. Not Met ENS 413402005-01-15T05:00:00015 January 2005 05:00:00 Other Unspec Reqmnt Unspecified Requirement ENS 410952004-10-05T22:30:0005 October 2004 22:30:00 Other Unspec Reqmnt One of Two Pressurizer Level Instrumentation Channels Found to Be Inoperable. ENS 408422004-06-25T14:50:00025 June 2004 14:50:00 Other Unspec Reqmnt Plant Exceeded Lco Action Statement Limits 2010-02-26T04:15:00 | |
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