ENS 42312
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ENS Event | |
|---|---|
19:36 Feb 5, 2006 | |
| Title | Required T.S. Shutdown Due to Emergency Diesel Generator Inoperability |
| Event Description | Unit 2 Train B emergency diesel generator D6 was removed from service at 2010 CST on 1/29/06 for planned maintenance and Technical Specification (TS) 3.8.1, 'AC Source - Operating,' Condition B, 'One DG inoperable,' was entered. TS Required Action 3.8.1.B.4 requires D6 be restored to operable status with a Completion Time of 7 days. The planned maintenance activities included replacing two sets of two pistons, rings and cylinder liners on Engine 2 of D6 (D6 is a tandem-engine diesel generator). Return-to-service testing was initiated on 2/4/06 and at approximately 0000 CST; the test was halted due to high-indicated crankcase pressure on Engine 1. The test procedure specifies shutting down the diesel generator if crankcase pressure on either engine exceeds 30mm for more than a few minutes (the setpoint for the crankcase pressure trip is 52 mm).
Investigation of the cause of the high-indicated crankcase pressure on Engine 1 started immediately. Unit 2 Train A emergency diesel generator (D5) was demonstrated operable by completing a surveillance test at 1507 CST on 2/4/06. Evaluation of the scope of work to return D6 to operable status and the schedule for completing the work indicated that repairs could not be completed within the remainder of the 7-day Completion Time. Based on this assessment an orderly shutdown of Unit 2 is being performed. Shutdown [to mode 5] of Unit 2 commenced at 1336 CST on 2/5/06. Unit 2 shutdown will continue until D6 is restored to operable status. The licensee notified the NRC Resident Inspector. |
| Where | |
|---|---|
Prairie Island  Minnesota (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown | |
| Time - Person (Reporting Time:+-4.62 h-0.193 days <br />-0.0275 weeks <br />-0.00633 months <br />) | |
| Opened: | Steve Schmidt 14:59 Feb 5, 2006 |
| NRC Officer: | Arlon Costa |
| Last Updated: | Feb 5, 2006 |
| 42312 - NRC Website
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Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
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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