ML19326B266
| ML19326B266 | |
| Person / Time | |
|---|---|
| Site: | Crystal River  |
| Issue date: | 04/21/1976 |
| From: | Rodgers J FLORIDA POWER CORP. |
| To: | Volganeau E NRC COMMISSION (OCM) |
| Shared Package | |
| ML19326B243 | List: |
| References | |
| NUDOCS 8003120833 | |
| Download: ML19326B266 (8) | |
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April 21, 1976 Mr. Ernest Volganeau, Director Directorate of Regulatory Operations U.S. Nuclear Regulatory Commission Washington, D. C. 20545
Subject:
Docket No. 50-302
Dear Mr. Volganeau:
Pursuant to 10CFR50.55E, we wish to follow up our verbal (telephone) notification of 4/19/76 regarding a separation in the concrete of the Crystal River Unit #3 containment g-~]s structure dome.
We have now documented the apparent extent
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of this separation.
To recap,the following is the sequence of events of the investig: tion.
On Wednesday, April 14, 1976, while placing cinch anchors in the dome concrete.of the Reactor Building, it was noted that there appeared to be a hollow area about one inch beneath the surface.
Investigation on Friday, April 16, by saw cutting and reinoving a section of concrete approximately one foot wide by three feet long, showed that the depth of the hollow area went deeper as it went higher on the dome.
By core drill-ing on Saturday and Sunday, April 17 and 18, it was further determined that the separation continued across the dome and went as deep as 15" and separated as much as 1-3/4 inches.
By using acoustic methods, the lower perimeter of the separated j
area was determined to extend all around the dome in pours "G",
"H" and "J".
Our engineers are now' evaluating the present condition of the structure.
Sketches marked I, II, III,'IV, V, and VI illustrate the apparent extent of the separation as indicated by the limited data available at this time.
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8 003120 N3 General Office 32o1 htv.tourm streer soum. P O. Box 14042. St. Petersbur@ Ror$b {@7$$ o @t@--M)-@1@L
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Mr. Ernest.Volganeau 2-A,.il 21, 1976 j
We will advise you when we have reached final resolution of this problem.
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If you have any questions, please advise us.
l Very truly yours, 1
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Rcdge Asst.
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cc:
Mr. Norman C. Moseley l
Director, Region II i
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