ML20084G539
| ML20084G539 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 01/04/1973 |
| From: | Worden W COMMONWEALTH EDISON CO. |
| To: | Anthony Giambusso US ATOMIC ENERGY COMMISSION (AEC) |
| Shared Package | |
| ML20084G541 | List: |
| References | |
| 216, NUDOCS 8304220077 | |
| Download: ML20084G539 (1) | |
Text
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fc.) $f Commonwealth Edison Company 72 WEST ADAMS STREET
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BLLINOIS l
Addr.se E. ply ser POST OfflCE tox 747
- CHICAGO, IL L f N OIS 4069 0 Dresden Nuclear Power Station i
R. R. #1 Morris, Illinois 60450
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January 4, 1973 o fn-
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Mr. A. Giambusso Deputy Director for Reactor Projects 9
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Direc_torate of Licensing
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,d U. S. Atomic Energy Commission Washington, D. C.
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SUBJECT:
LICENSE DPR-19, DPESDEN NUCLEAR POWER STATION, UNIT #24 SECTION 5.6.B.3 CP THE TECH!;ICAL SPECIFICATIONS.
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Reference:
Letter to Edward J. Bloch from W. P. Worden dated June 6,1972.
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Dear Mr. Giambusso:
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[jf Af ter the failure of snap-lock limit switch SL4C-64L on May 27, p
1972, (Reference) an investigation was initiated to determine the cause h JI of the failure.
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On corresponding with the vendor, National Acme Company, they
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assured us that the snap-lock switches are the most reliable switelfes?
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available.
\\p L The vendor recommended the following to avoid the possibility of a similar type of failure 1.
Check snap-lock switches with slow lever arm movement for i
similar type of failure.
2.
Tag all National Acme snap-lock switches with a caution note to read:
Caution - when assembling liner onto shaf t, lever must be held stationary so that shaft does not rotate as pipe plug is tightened.
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The above mentioned items have been completed on both Units 2 and 3, and are expected to minimize the potential for similar failures in the future.
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