ML20003B030
| ML20003B030 | |
| Person / Time | |
|---|---|
| Site: | Quad Cities  |
| Issue date: | 02/02/1981 |
| From: | Kalivianakis N COMMONWEALTH EDISON CO. |
| To: | Case E Office of Nuclear Reactor Regulation |
| References | |
| NJK-81-46, NUDOCS 8102100242 | |
| Download: ML20003B030 (2) | |
Text
_
Commonwealth Edison
.N Ouad Citi s Nucte r Power Station j
F, l
22710 206 Avenue North Y
Cordova, lilinois 61242 s
Y Telephone 309/654-2241 h/
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NJ K-81 -46 February 2, 1981 Mr. Edson G. Case, Deputy Di rector Of fice of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D. C.
20555
Dear Mr. Case:
Enclosed please find a listing of those changes, tests, and experiments completed during the month of January,1981, for Quad-Cities Nuclear Power Station Units One and Two, DPR-29 and DPR-30.
A summary of the safety evaluation is being reported in compliance with 10 CFR 50.59 Thirty-nine copies are provided for your use.
Very truly yours, COMMONWEALTH EDIS0N COMPANY QUAD-CITIES NUCLEAR POWER STATION lh v,ts.W/b N. J. Kalivianakis Station Superintendent bb Enclosure cc R. F. Janecek t~
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a M-4-1-79-31 RCIC Temperature Switches Description of Modification This modification replaced the RCIC area temperature switches with a new model to improve reliability. The old switches had instrument drift problems and this unfavorable trend necessitated replacement.
Summary of Safety Analysis The new temperature switches will increase the reliability of the system, thereby reducing the probability of a malfunction. No design and function changes were made to the system; therefore, no different type malfunctions are created than have been previously evaluated.
The margin of safety is increased by improving reliability.
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