ML20084D986
| ML20084D986 | |
| Person / Time | |
|---|---|
| Site: | Dresden, 05000000 |
| Issue date: | 05/08/1973 |
| From: | Worden W COMMONWEALTH EDISON CO. |
| To: | Anthony Giambusso US ATOMIC ENERGY COMMISSION (AEC) |
| Shared Package | |
| ML20084D897 | List: |
| References | |
| 3214, 370-73, NUDOCS 8304130130 | |
| Download: ML20084D986 (1) | |
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50-237 Commonwealth Edison Company DNE F8MST NATIONAL PLAZA
- C H I C A G O.
IL LI N OI S Im.e.v, POST OFFICE 805 Fe7
- CHICAGO, BL&lNOll 40690 Dresden Nuclear Power Station R. R. #1
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.V A. Ciambusso 3
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Deputy Director for Reactor Projects 0.h Directorate of Licensing U.S. Atomic Energy Comnission Washington, D.C.
20545 SUlWECT: License DP&l9 Dresdon Nuclear Pcwer Station. Unit 2 Apparent Uncouplin;: Control l',cd Drives
Reference:
Letter to lir. Giambusso fro:a W. P. Worden dated !! arch 13, 1973.
Dear Mr. Ciambusso:
In our March 13 letter to you (Reference 1) concerning a possible uncoupling of 3 Unit 2 control rod / control rod drives, we informed you that we would submit a report describing the results of the disassembly and inspection of the 3 drives by approximately April 30, 1973.
he heavy outage work load on Dresden Unit 3 has delayed the complete disassembly and inspection of these drives. However, the drives have been removed from Unit 2 and replaced with spare drives. A preliminary inspection of the drives during removal has revealed that two drives apparently had an improperly installed inner screen which could have resulted in drive uncoupling.
Investigation to determine the cause of the apparent uncoupling has continued through meetings with General Electric Company. As a result of this investigation, it is our conclusion at thic time that there are no safety impli-cations. Control rod uncoupling cannot occur at any position other than position 48 (fully withdrawn) because interference between the drive uncoupling rod and mislocated inner screen can only occur at the fully withdrawn position.
We disassembly and inspection of the 3 drives is presently in progress.
It is expected that we will complete our inspection and submit a rep'stt to you on or about June 15, 1973.
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0304130130 740306 W. P. Worden Y
05000 3 gDRADDCK Superintendent j
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