ML20072A737

Final Deficiency Rept Re Problems W/Riley Temp Switches. Initially Reported on 830316.Based on Engineering Evaluation by Riley,Switches Accurately Perform Intended Function When Calibr W/Modified Procedure

ML20072A737
Person / Time
Site:	LaSalle
Issue date:	06/03/1983
From:	Schroeder C COMMONWEALTH EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
10CFR-050.55E, 6696N, NUDOCS 8306100234
Download: ML20072A737 (2)

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Commonwealth Edison

' ) One First National PlJzt, Chicago, Ilhnois O "J Address Reply to: Post Office Box 767

/ Chicago, Illinois 60690 June 3, 1983 Mr. James G. Keppler, Director

- Region III U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137

Subject:

LaSalle County Station Unit 2 10CFR50.55(e) Notification 83-01 Final Report, Riley Temperature Indicating Switches NRC Docket No. 50-374 Reference (a): C.W. Schroeder letter to J.G. Keppler dated March 16, 1983.

(b): C.W. Schroeder letter to J.G. Keppler dated May 3, 1983.

Dear Mr. Keppler:

Commonwealth Edison filed a 30 day report to your office by Reference (a) concerning the status of the problems we experienced with the Riley temperature switches installed in the leak detection system at LaSalle.

In that report it was indicated that the calibration procedure for these devices would be modified to solve the temperature off-set problem. Our updated interim report of May 3, 1983 indicates that the switch units had been recalibrated utilizing a revised procedure and were accurately indicating the proper temperature.

It was further indicated in the Reference (b) repoIt that final resolution of the temperature module problem was anticipated by June 1, 1983. Although it was expected that General Electric and Riley would develop a permanent remedy based on a hardware modification, it was ultimately determined after engineering eveluation by Riley that none is available at this time for the Model 86. Based on the fact that the temperature switches accurately perform their intended function when calibrated with the modified procedure suggested by Riley, they suggest that the devices are acceptable "as-is".

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8306100234 e30603 PDR ADOCK 03000374

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~Q' J.-G. Keppler June 3, 1983

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We therefore conclude that the plant is operable because the Riley temperature switches (Model 86) installed in the leak detection system have been recalibrated by revised procedure and perform within specification and that no hardware modification is required to achieve this.

. If you or your staff have any questions concerning this activity, please contact this office.

Very truly yours, s/7/s3 C.W. Schroeder Nuclear Licensing Administrator 1m cc: Region III Inspector _- LSCS Director of Enforcement and Inspection Washington, D.C. 20555 6696N i

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