ENS 44363: Difference between revisions
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| event date = 07/24/2008 15:02 EDT | | event date = 07/24/2008 15:02 EDT | ||
| last update date = 07/24/2008 | | last update date = 07/24/2008 | ||
| title = Tech Spec Required Shutdown Due | | title = Tech Spec Required Shutdown Due to Loss of Essential Raw Cooling Water Pump with 2 Edg'S Oos | ||
| event text = WBN Unit 1 experienced a failure of the B-A ERCW pump on July 21, 2008, at 2:46 p.m. EDT. The plant entered LCD 3.7.8, Condition A, for one ERCW train inoperable and LCD 3.8.1, Condition C, with two required DGs in Train A inoperable concurrently. Required Actions for LCO 3.7.8 and LCD 3.8.1 required restoration of the inoperable ERCW train and one DG to OPERABLE status in 72 hours, respectively. Plant shutdown was initiated in accordance with LCD 3.7.8, Condition B and LCD 3.8.1, Condition G when the above Required Actions were not met. The root cause of the pump failure is unknown at this time. An event team has been set-up to determine cause of pump failure. Currently, the unit is performing a control shutdown, and all systems are functioning as expected. | | event text = WBN Unit 1 experienced a failure of the B-A ERCW pump on July 21, 2008, at 2:46 p.m. EDT. The plant entered LCD 3.7.8, Condition A, for one ERCW train inoperable and LCD 3.8.1, Condition C, with two required DGs in Train A inoperable concurrently. Required Actions for LCO 3.7.8 and LCD 3.8.1 required restoration of the inoperable ERCW train and one DG to OPERABLE status in 72 hours, respectively. Plant shutdown was initiated in accordance with LCD 3.7.8, Condition B and LCD 3.8.1, Condition G when the above Required Actions were not met. The root cause of the pump failure is unknown at this time. An event team has been set-up to determine cause of pump failure. Currently, the unit is performing a control shutdown, and all systems are functioning as expected. | ||
The licensee does not expect the ERCW pump to be returned to service and will downpower at 15% per hour. The licensee expects to be in Mode 3 by 2030 EDT. All required safety systems for safe shutdown are operable. | The licensee does not expect the ERCW pump to be returned to service and will downpower at 15% per hour. The licensee expects to be in Mode 3 by 2030 EDT. All required safety systems for safe shutdown are operable. | ||
Latest revision as of 21:13, 1 March 2018
| Where | |
|---|---|
Watts Bar  Tennessee (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown | |
| Time - Person (Reporting Time:+-3.98 h-0.166 days <br />-0.0237 weeks <br />-0.00545 months <br />) | |
| Opened: | Doug Holt 15:03 Jul 24, 2008 |
| NRC Officer: | Joe O'Hara |
| Last Updated: | Jul 24, 2008 |
| 44363 - NRC Website
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