ML101170673
| ML101170673 | |
| Person / Time | |
|---|---|
| Site: | Crystal River  |
| Issue date: | 11/05/2009 |
| From: | Robert Carrion NRC/RGN-II |
| To: | Mark Franke NRC/RGN-II |
| References | |
| FOIA/PA-2010-0116 | |
| Download: ML101170673 (2) | |
Text
Franke, Mark From:
Carrion, Robert Sent:
Thursday, November 05, 2009 4:38 PM To:
Franke, Mark
Subject:
RE: Crystal River Containment Wall Opening Core Boring Pictures I will do it.
Bob From: Franke, Mark Sent: Thursday, November 05, 2009 3:40 PM To: Chou, Rich; Carrion, Robert Cc: Lake, Louis
Subject:
RE: Crystal River Containment Wall Opening Core Boring Pictures Thanks Rich.
Bob, please ensure to ask licensee about these observations.
From: Chou, Rich Sent: Thursday, November 05, 2009 1:46 PM To: Franke, Mark Cc: Sykes, Marvin; Ninh, Son; Khanna, Meena; Morrissey, Thomas; Reyes, Rogerio; Lake, Louis; Chou, Rich
Subject:
FW: Crystal River Containment Wall Opening Core Boring Pictures Mark:
Pictures from left to right:
- 1. Top hole at right opening wall 2. Bottom hole at the right opening wall 3. Top hole at the left opening wall 4.
Bottom hole at the left opening wall 5. No. 5 hole perpendicular to the wall at the left side During'the observation of Steam Generators OSG-A and OSG-B moved out, I noticed that there were 5-2" diameter holes drilled for core boring. Two holes were on each side of opening at 2 ft. from the bottom of the opening for the first hole and secon hole was about 18 inches above the first hole. Theose four holes were drilled parallel to hoop tendons and were about 14 inches from the liner plate in the good concrete, no cracked area from each side of the cut area. Those 4 holes were about 14 inches deep. The no. 5 hole was about 2 ft. from the left edge of the opening and 2 ft from the bottom of the opening and was drilled perpendicular to the wall.
This hole was about 10 to 12 inches deep and drilled to the cacked or delamination line. The outside face of the delamination was removed by the sample. The inside face of the delamination is still intact.
Based on my observation of the 4 holes parallel to the hoop tendons, the cut area was fresh, same texture, uniform grey color, and fine particle.
The'No. 5 hole can be seen to have rough surface, fine bubble, different colors with some dark color, aged color, and total different texture from the other 4 holes. There is evidence that the delamination was not created recently by the hydraulic demolition or unbalanced tendon stress due to some tendon stresses nearby were not released. The delamination was existed since the construction, due to the incomplete curing, and applied tension forces too early.
There is also strongly to suggest that inadequate design without the radial rebars.
142 Q.f
The containment wall delamination should be discovered during the extent of condition of the containment dome delamination. They were related since the original construction.
From: Reyes, Rogerio Sent: Thursday, November 05, 2009 12:38 PM To: Chou, Rich
Subject:
Your pictures J. Rogerio Reyes, P.E.
U.S. Nuclear Regulatory Commission Resident Inspector Crystal River Nuclear Power Plant 143