ML19329D537
| ML19329D537 | |
| Person / Time | |
|---|---|
| Site: | Crystal River  |
| Issue date: | 06/11/1976 |
| From: | Rodgers J FLORIDA POWER CORP. |
| To: | |
| References | |
| NUDOCS 8003160136 | |
| Download: ML19329D537 (3) | |
Text
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Florida June il, 1976 P..o..w..e.. r c
Mr. Norman C. Moseley, Director U. S. Nuclear Regulatory CommissMn Region 11 230 Peachtree Street, NW Suite 818 Atlanta, Georgia 30303
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Re: Docket No. 50-302
Dear Mr. Moseley:
Pursuant to 10CFR50.55(e), we wish to follow up our written notification of April 21, 1976 regarding a separation in the concrete of the Crystal River Unit #3 containment structure dome.
Attached is our interim report entitled, " CRYSTAL RIVER #3 DOME DELAMINATION REPORT", dated June 11, 1976. This report addresses:
1.
Introduction 2.
Original Structure 3.
Problem Definition 4.
Delamination Structure 5.
Corrective Action 6.
References 7.
Quality Assurance During the investigation and evaluation period, we have had benefit of informal staff discussions on two occassions and numerous exchanges of staff and ACRS Memb.e.rs reported concerns. This interim report addresses each of these concerns to the extent our present information and expertise allows at this time.
The included evaluation does not provide any reasonable direction as to why the delamination occurred.
Our report includes a proposed corrective action in 02 tion 5.
We feel that further theorizing as to "why" will be inconclusive and time consuming. We cre, therefore, prer,ared to proceed with the corrective action as entirely cdequate to assure that the containment structure, when so repaired, will be
___ capable of meeting the original design criteria as demonstrated by calculation cud the Structural Integrity Test (SIT).
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80 03160 G b General Office 32ci Tnirty-fourtn street soutn. P.O Box 14042. St Petersburg. Florida 33733 813-866 5151
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We are very cognizant of staff concerns for the detensioning activity proposed and have incorporated in the report our response to these concerns.
In this regard, development of detailed work procedures addressing the repair effort is ongoing and will be made available to I&E inspectors at the site or forwarded to the Commission directly as required.
It has been concluded by Florida Power Corporation from all evaluations available to us at this time, that the proposed corrective action is a correct and reasonably risk-free approach to an acceptable repair.
We, therefore, propose to begin work activities associated with the,,roposed corrective actions outlined on June 15, 1976 in accordance with the attach,ed schedule. Assuming no adverse occurrences, we will proceed toward ultimate conclusion of this work on this schedule.
T[ allow you and ourselves the opportunity for continued cooperation, exchange of questions and our responses, we request an informal session in Bethesda on June 18, 1976. At the close of this session, we would solicit your concurrence with our corrective action and the proposed work schedule.
If you have any questions concerning our filing or the subsequent meetings with the Commission, please advise us.
Very truly yours, 1
T. Rodgers Asst. Vice President JTR:pam cc:
E. Volganeau L. Engle CR-3 w/40 attach.
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