ML101170326
| ML101170326 | |
| Person / Time | |
|---|---|
| Site: | Crystal River  |
| Issue date: | 10/06/2009 |
| From: | Robert Carrion NRC/RGN-II |
| To: | Blake J NRC/RGN-II |
| References | |
| FOIA/PA-2010-0116 | |
| Download: ML101170326 (1) | |
Text
Carrion, Robert From:
Carrion, Robert 1 Sent:
Tuesday, October 06, 2009 12:53 PM To:
Blake, Jerome
Subject:
RE: Crystal River containment crack Thanks for the information, Jerry. I will try to get more from the licensee.
Bob Carrion From: Blake, Jerome Sent: Tuesday, October 06, 2009 10:14 AM To: Chou, Rich; Carrion, Robert Cc: Ogle, Chuck; Moorman, James; ODonohue, Kathleen
Subject:
Crystal River containment crack Rich, Bob, During conversation with Chuck Ogle about the Crystal River containment cracking issue, I remembered an issue concerning Crystal River from construction days.
After the containment was completed and post-tensioned, the containment dome spontaneously de-laminated.
(aloud "BANG" was heard, and subsequent investigation found the de-lamination problem.) At that time Gilbert and Associates, (the site Architect/Engineer) determined that re-bar hooks meant to couple the outer and inner layers of rebar in the dome had been left off the rebar detail plans and therefore had not been installed. I believe the details of the dome problem were documented in a 50.55(e) report.
This morning I heard that the licensee is saying that the containment crack appears to be full height of the containment and 360-degrees. It seems to me that the current problem sounds like an issue similar to the problem that resulted in de-lamination of the dome - re-bar hooks connecting inner and outer layers of rebar were omitted from the detail plans and never installed.
I don't know if the licensee would remember the earlier issue, but I thought that you should know about the history of the containment dome so that you can see if the licensee and contractors are factoring in that part of the history of the containment in their root cause analyses.
Jerry