ENS 41204
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ENS Event | |
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02:50 Nov 18, 2004 | |
Title | Technical Specification Required Shut Down Due to Both Trains of Containment Cooling System Fan Coil Units Inoperable |
Event Description | Initiation of a Unit 2 shutdown commenced at 2050 on November 17, 2004, as required by Technical Specification (TS) Limiting Condition for Operation (LCO) 3.0.3 because both trains of containment cooling were declared inoperable as of 1615. Each train of Prairie Island's Containment Cooling System includes two containment fan coil units (CFCUs), for a total of four CFCUs. TS 3.6.5 requires two trains of containment cooling to be operable. Leakage from the 23 CFCU was determined to render one train of containment cooling inoperable at 1551. At 1615, the 22 CFCU (one of two CFCUs in the opposite train of containment cooling) was also determined to be leaking rendering the second train of containment cooling inoperable. Two CFCUs are fully capable of removing the design basis heat load; however, as the two remaining operable CFCUs are in different trains, neither train of containment cooling could be considered operable. Both inoperable CFCUs have been isolated to restore containment integrity and facilitate repairs. TS LCO 3.6.5 does not have a Condition for both containment cooling trains inoperable, therefore TS LCO 3.0.3 was entered.
The licensee has notified the NRC Resident Inspector. |
Where | |
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Prairie Island ![]() Minnesota (NRC Region 3) | |
Reporting | |
10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown | |
Time - Person (Reporting Time:+-3.07 h-0.128 days <br />-0.0183 weeks <br />-0.00421 months <br />) | |
Opened: | Todd Strain 23:46 Nov 17, 2004 |
NRC Officer: | Bill Huffman |
Last Updated: | Nov 18, 2004 |
41204 - NRC Website
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Unit 2 | |
---|---|
Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Hot Standby (0 %) |
WEEKMONTHYEARENS 502152014-06-20T01:35:00020 June 2014 01:35:00
[Table view]10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification Required Shutdown ENS 481862012-08-14T08:12:00014 August 2012 08:12:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(b)(3)(iv)(A), System Actuation, 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification Required Shutdown Based on Both Emergency Diesels Being Declared Inoperable ENS 438592007-12-21T10:13:00021 December 2007 10:13:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification Required Shutdown Due to Both Edg'S Being Declared Inoperable ENS 423122006-02-05T19:36:0005 February 2006 19:36:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Required T.S. Shutdown Due to Emergency Diesel Generator Inoperability ENS 416062005-04-16T02:30:00016 April 2005 02:30:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Plant Shutdown Required by Technical Specifications - Inoperable Emergency Diesel Generator ENS 415482005-03-30T13:35:00030 March 2005 13:35:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification Shutdown Due to Containment Fan Coil Units Declared Inoperable ENS 412042004-11-18T02:50:00018 November 2004 02:50:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification Required Shut Down Due to Both Trains of Containment Cooling System Fan Coil Units Inoperable 2014-06-20T01:35:00 | |
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