ENS 45416: Difference between revisions
Jump to navigation
Jump to search
StriderTol (talk | contribs) (Created page by program invented by Mark Hawes) |
StriderTol (talk | contribs) (Created page by program invented by StriderTol) |
||
| Line 16: | Line 16: | ||
| event date = 10/07/2009 19:30 EDT | | event date = 10/07/2009 19:30 EDT | ||
| last update date = 10/07/2009 | | last update date = 10/07/2009 | ||
| title = Discovery | | title = Discovery of a Containment Separation | ||
| event text = Crystal River Unit 3 is currently shutdown for a planned refueling and steam generator replacement outage. During containment building concrete removal activities to create a construction opening to support steam generator replacement, a separation in the concrete was discovered in the vicinity of the construction opening near the periphery of the containment. The Crystal River Unit 3 containment is a steel lined, post tensioned concrete structure nominally 42 inches thick. Post tensioning is achieved utilizing an outer array of horizontal tendons immediately adjacent to an inner array of vertical tendons. The separation is generally in the plane of the horizontal tendons. Inside the separation is 30 inches of concrete and the steel liner plate. This condition has been evaluated relative to current plant conditions and found to represent no degradation in safety. Crystal River Unit 3 personnel in conjunction with industry experts are currently performing a detailed analysis of this separation to determine the cause, extent of condition, the impact on the containment building function and any required repairs prior to plant restart. Operating experience reports are being prepared to share our information with the industry. The station will provide updates as we gain more information concerning this issue. | | event text = Crystal River Unit 3 is currently shutdown for a planned refueling and steam generator replacement outage. During containment building concrete removal activities to create a construction opening to support steam generator replacement, a separation in the concrete was discovered in the vicinity of the construction opening near the periphery of the containment. The Crystal River Unit 3 containment is a steel lined, post tensioned concrete structure nominally 42 inches thick. Post tensioning is achieved utilizing an outer array of horizontal tendons immediately adjacent to an inner array of vertical tendons. The separation is generally in the plane of the horizontal tendons. Inside the separation is 30 inches of concrete and the steel liner plate. This condition has been evaluated relative to current plant conditions and found to represent no degradation in safety. Crystal River Unit 3 personnel in conjunction with industry experts are currently performing a detailed analysis of this separation to determine the cause, extent of condition, the impact on the containment building function and any required repairs prior to plant restart. Operating experience reports are being prepared to share our information with the industry. The station will provide updates as we gain more information concerning this issue. | ||
The licensee notified the NRC Resident Inspector. | The licensee notified the NRC Resident Inspector. | ||
Latest revision as of 22:11, 1 March 2018
| Where | |
|---|---|
Crystal River  Florida (NRC Region 2) | |
| Reporting | |
| Other Unspec Reqmnt | |
| Time - Person (Reporting Time:+-3.95 h-0.165 days <br />-0.0235 weeks <br />-0.00541 months <br />) | |
| Opened: | William Krehely 19:33 Oct 7, 2009 |
| NRC Officer: | Pete Snyder |
| Last Updated: | Oct 7, 2009 |
| 45416 - NRC Website
| |