ML19326B276
| ML19326B276 | |
| Person / Time | |
|---|---|
| Site: | Crystal River  |
| Issue date: | 04/21/1976 |
| From: | Rodgers J FLORIDA POWER CORP. |
| To: | Volganeau E Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8003160105 | |
| Download: ML19326B276 (9) | |
Text
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8KOM DATE 08 OOCUMmf DATE RECE.vtD NO: FLORIDA POWER CORPORATION LYR WiMO REPORT. OTHER X TO Ont4-CC. OTHER X IE ( ROY ) acnO= asCassaav O coacuaaaacs O ^^ = 'a'" =0 acnO= =<CassaRv O comme =T O =v-CLLssas.: POsf OFFICE p.LE CODE 'U R.c O O w.PT.0= wi.~' 50-302 R<Feaat0 TO pan aeCoveO or O.Ts LETT2R IN REF. TO TELEPHONE CONVERSA-g/[O TION'REGARDING A SEPE ATION IN THE CON" GOWER j R.A. HARTFIELD CRETE OF THE CRYSTAL RIVER UNIT 3 CON- / TAINMENT STRUCTURE DOME. E=cLOsvRls-y COPIES FOR REACTOR FACILITIES BRANCll PDR, LOCAL PDR, NSIC, AND DTIE SENT TO REGIONAL COORDINATOR FOR DISTRIBUTION. te.u.Rxs 1 COPY SENT TO REGION II i U s NUCLE AR REGULATORY COMut5siON FORM h4C 326s 4 8% ~ w W 8003160 id n
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f C ' h. _9[j D& oy c v,. ee t y vg(sg +4.? f$Q :, - "e u.a Florida Power April 21, 1976 Mr. Ernest Volganeau, Director Directorate of Regulatory Operations U.S. Nuclear Regulatory Commission Washington, D.C. 20545
Subject:
. Docket No. 50-302
Dear Mr. Volganeau:
Pursuant to 10CFR50.55E, we wish to follow up our verbal (telephone) notification of 4/19/76 regarding a separation in the concrete of the Crystal River Unit #3 containment structure dome. We have now documented the apparent extent of this separation. To recap,the following is the sequence of events of the investigation. On Wednesday, April 14, 1976,' while placing cinch anchors in the dome concrete of the Reactor Building, it was noted that there appeared to be a hollaw area about one inch beneath the s ur.f ac e. Investigation on Friday, April 16, by saw cutting and removing a section of concrete approximately one foot wide by three feet long, showed that the depth of the hollow area went deeper as it went higher on the dome. By core drill-ing on Saturday and Sunday, April 17 and 18, it was further determined that the separation continued across the dome and - went as deep as 15" and separated as much as 1-3/4 inches. By using acoustic methods, the lower perimeter of the separated area was determined to extend all around the dome in pours "G", "H" and "J". Our engineers are now evaluating the present condition of the structure. Sketches marked I, II, III, IV, V, and VI illustrate the , apparent extent of the separation as indicated by the limited data available at this time. k$ bb7 General Office 3201 Tnirty.tourin street soutn. P O Box 14042. St Petersburg. Fionda 33733 813-866-5151
Mr. Ernest Volganeau April 21, 1976 We will advise you when we have reached final resolution of this' problem. - If you have any questions, please advise us. Very truly yours, i-i J. Rodge Asst. Vice President JTR/iw Attachments. cc: Mr. Norman C. Moseley Director, Region II f e 4 3 i 4 l l + ~,- +n e, p, ,--,w -,,,y,. ..a,,- -.,. , - - ~ p-, 3 -.,, yep
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