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Initiation of a Unit 2 shutdown commenced … 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.</br>The licensee has notified the NRC Resident Inspector.e has notified the NRC Resident Inspector. +
02:50:00, 18 November 2004 +
41,204 +
23:46:00, 17 November 2004 +
02:50:00, 18 November 2004 +
Initiation of a Unit 2 shutdown commenced … 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.</br>The licensee has notified the NRC Resident Inspector.e has notified the NRC Resident Inspector. +
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23:46:00, 17 November 2004 +
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Technical Specification Required Shut Down Due to Both Trains of Containment Cooling System Fan Coil Units Inoperable +
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