ML20084G539

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Updates 720606 RO Re 720527 Failure of snap-lock Limit Switch SL4C-64L.Manufacturer Assures That Switches Are Most Reliable Switches Available.Vendor Recommended That Precautions Be Taken
ML20084G539
Person / Time
Site: Dresden Constellation icon.png
Issue date: 01/04/1973
From: Worden W
COMMONWEALTH EDISON CO.
To: Giambusso A
US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20084G541 List:
References
216, NUDOCS 8304220077
Download: ML20084G539 (1)


Text

_ - - - - _ _ _ - _ _

.?- (v1 I fc.) $f Commonwealth Edison Company ,

72 WEST ADAMS STREET

  • C H I C A G O. BLLINOIS l Addr.se E. ply ser l POST OfflCE tox 747
  • CHICAGO, IL L f N OIS 4069 0 Dresden Nuclear Power Station i R. R. #1
Morris, Illinois 60450 /~ e S

January 4, 1973 o

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e Ilf. Jr. LJ l-- JAW 8 197F: ,

Mr. A. Giambusso p Deputy Director for Reactor Projects 9 ;ggm g Direc_torate of Licensing \f , f g' U. S. Atomic Energy Commission ,d

, Washington, D. C. 20545 ,

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SUBJECT:

LICENSE DPR-19, DPESDEN NUCLEAR POWER STATION, UNIT #2 4 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

<J( assured us that the snap-lock switches are the most reliable switelfes?

J ' 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.

.f 6 f ., Sincerely, ,

ynrn em ri qmf[ ~____.,

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DR ADOCK 05000237 i PDR ,

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