ML19323H875

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Revises Response to IE Bulletin 79-28, Possible Malfunction of Namco Model EA180 Limit Switches at Elevated Temps. Cover Gasket Replacement Will Be Completed When Cables to Switches Are Terminated
ML19323H875
Person / Time
Site: Byron, Braidwood  Constellation icon.png
Issue date: 05/30/1980
From: Peoples D
COMMONWEALTH EDISON CO.
To: James Keppler
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
IEB-79-28, NUDOCS 8006170160
Download: ML19323H875 (2)


Text

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Commonwealth Edison s 6

- : one Fstst National Plaza. Chicago Ilhnois gC Addtss R: ply t;: P;st Offica Box 767 k'!** Chicrgo lilinois 60690 t

May 30, 1980 Mr. James G. Keppler, Director Directorate of Inspection and Enforcement - Region III U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137

Subject:

Byron Station Units 1 and 2 Braidwood Station Units 1 and 2 Additional Response to I.E.

Bulletin No. 79-28, "Possible Malfunction of NAMCO Model EA180 Limit Switches At Elevated Temperatures" NRC Docket Nos. 50-454, 50-455, 50-456 and 50-457 References (a): December 10, 1979, letter from J. G. Keppler to C. Reed trans-mitting I.E. Bulletin No. 79-28 (b): February 11, 1980, letter from D. L. Peoples to J. G. Keppler

Dear Mr. Keppler:

Reference (a) transmitted I.E. Bulletin No. 79-28, "Possible Malfunction of NAMCO Model EA180 Limit Switches At Elevated Temperatures," which requested Commonwealth Edison Company to take certain action at its Byron and Braidwcod Stations.

Reference (b) contained Commonwealth Edison's response to that Bulletin which stated that the identification and re-placement pleted by May of cover 31, 1980. gaskets of the subject switches would be com-However, a further review of the status of electrical installation in the containment building in-dicated that replacement of the cover gaskets on all NAMCO EA180 limit switches switches would atprovide the timeforwhen a more the efficient cable is and terminated to the controlled re-placement program.

Therefore, Commonwealth Edison has instructed the Construction Departments at both the Byron and Braidwood sites to the to replace the cover gaskets at the time they terminate cables switches. Both sites have procedures regarding the re-placement by and logs its associated valve will be maintained identifying the limit switch number.

8006170/0l7 g a

Commonwe:lth Edison Mr. Jcmas G. K ppler May 30, 1980

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'Since, under the program described above, the gaskets will be replaced when the switch is terminated, all switch gaskets on a particular system will now be changed prior to pre-operational testing of that system in lieu of May 31, 1980, as indicated in Reference (b).

Please address any questions that you might have concerning this matter to this office.

Very truly yours, D. L. Peo ..es Director of Nuclear Licensing cc: Director, Division of Reactor Operation Inspection 0

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