ML20106A220

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Provides Addl Info Re Monitoring to Detect Fouling of Feedwater Flowmeter Venturis.Info Suppls on Byron License Condition 13.Feedwater Venturi Will Be Inspected at First Refueling Outage
ML20106A220
Person / Time
Site: Byron, Braidwood, 05000000
Issue date: 02/05/1985
From: Tramm T
COMMONWEALTH EDISON CO.
To: Harold Denton
Office of Nuclear Reactor Regulation
References
9692N, NUDOCS 8502110076
Download: ML20106A220 (1)


Text

__

. C:mm:nw:cith Edison

.O One First National Plaza. Chicago. Illinois Address Reply to: Post Office Box 767 - .

Chicago, Illinois 60690 h

February 5, 1985 d mi y

Mr. Harold R. Denton, Director 3I Office of Nuclear Reactor Regulation U.S. Wclear Regulatory Commission g

Washington, DC 20555

Subject:

Byron Generating Station Units 1 and 2 Braidwood Generating Station Units 1 and 2 Improved Thermal Design Procedure WC Docket Nos. 50-454/455 and 50-456/457 Reference (a): January 23, 1985 letter from T. R. Tramm to H. R. Denton. {

~

Dear Mr. Denton:

This letter provides additional information regarding the monitoring

-l to be done at Byron and Braidwood stations to detect fouling of the feedwater flowmeter venturis. This supplements the information provided in reference (a) [

regarding License Condition 13 of the Byron Operating License, NPF-23. L To provide additional assurance that venturi fouling is not occuring, at least two of the four feedwater venturis in each unit will be inspected at the first refueling. The inspections will consist of visual examinations -

through special inspection ports. Representative sections of each venturi will be inspected either directly or with the aid of mirrors, borescopes, television $

or other suitable optical means, depending upon the individual geometry and W technology available. To the extent practical, the surface of the venturi will be physically examined for roughness or unevenness by reaching through the ,

inspection port and touching the venturi surface. These inspections will [

continue as described in reference (a) until it can be demonstrated to the -d WC's satisfaction that venturi fouling is not occurring.  ;

If all four venturis are cleaned during a refueling outage, no (

allowance for fouling will be made in the relevant. setpoints and operating ,

limits. If all four venturis are not cleaned, an allowance of 0.1% will be .

included to compensate for possible undetected fouling. Although this allowance J has been established somewhat arbitrarily, it is believed that the inspections y described above can detect venturi fouling well below the amount required to a induce a flow error of 0.1%. j Please address further questions regarding this matter to this office. h d

Very truly yours, -

' MN T. R. Tramm  ?

mclear Licensing Administrator j 1m O

7 i y

Byron Resident Inspector i0 E 0502110076 850205 I s

PDR ADOCK 05000454

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