ENS 46673
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ENS Event | |
|---|---|
18:11 Mar 14, 2011 | |
| Title | Additional Delaminated Containment Concrete Discovered |
| Event Description | Crystal River Unit 3 is currently shutdown. Final tendon re-tensioning activities were being conducted following repair of delaminated (separated) concrete at the periphery of the containment wall. At approximately 1311 [EDT] on March 14, 2011, an indication was received from acoustic monitoring instrumentation located on the containment wall outside the previously repaired area. Re-tensioning activities were stopped and Plant Operations verified that there were no changes in plant parameters. Non-destructive examinations were initiated and preliminary indications are that there is delaminated concrete in the area identified by the acoustic monitoring. An assessment concluded that the containment continues to maintain the closure-pressure retaining capability required for Mode 5. There continues to be no threat to the public heath and safety.
Delaminated concrete at the periphery of the containment wall was created in late 2009 during the process of creating an opening in the structure to remove and replace the steam generators inside (Reference Event Report 45416). The unit was already shut down for refueling and maintenance at the time the damage was found and has remained shut down. The extent of newly discovered delaminated has not yet been determined. The licensee plans to make a press release. The licensee has notified the NRC Resident Inspector and the Florida Public Service Commission. |
| Where | |
|---|---|
Crystal River  Florida (NRC Region 2) | |
| Reporting | |
| Other Unspec Reqmnt | |
| Time - Person (Reporting Time:+21.08 h0.878 days <br />0.125 weeks <br />0.0289 months <br />) | |
| Opened: | William Kisner 15:16 Mar 15, 2011 |
| NRC Officer: | John Shoemaker |
| Last Updated: | Mar 15, 2011 |
| 46673 - NRC Website
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Unit 3 | |
|---|---|
| Reactor critical | Not Critical |
| Scram | No |
| Before | Cold Shutdown (0 %) |
| After | Cold Shutdown (0 %) |
WEEKMONTHYEARENS 529572017-09-09T15:09:0009 September 2017 15:09:00
[Table view]Other Unspec Reqmnt Hurricane Warning Issued Affecting Site within 36 Hours ENS 467222011-04-04T04:00:0004 April 2011 04:00:00 Other Unspec Reqmnt Press Release Concerning Additional Containment Delamination ENS 466732011-03-14T18:11:00014 March 2011 18:11:00 Other Unspec Reqmnt Additional Delaminated Containment Concrete Discovered ENS 454162009-10-07T23:30:0007 October 2009 23:30:00 Other Unspec Reqmnt Discovery of a Containment Separation ENS 437062007-10-10T17:12:00010 October 2007 17:12:00 Information Only, Other Unspec Reqmnt, 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Pressurizer Porv Opened Momentarily with Rcs Discharge of Approximately 10 Gallons 2017-09-09T15:09:00 | |
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