ML20135J058

Potential Significant Deficiency Rept SD-82 Re Deficient Westinghouse Core Exit Thermocouple Sys.Initially Reported on 850509.Qualification Tests on Sys Components Continuing. Next Rept Will Be Submitted on 850930

ML20135J058
Person / Time
Site:	Millstone
Issue date:	08/29/1985
From:	Mrocza E, Mroczka E, Opeka J NORTHEAST NUCLEAR ENERGY CO., NORTHEAST UTILITIES
To:	Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
F0788A, F788A, SD-82, NUDOCS 8509250173
Download: ML20135J058 (2)

Text

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HARTFORD. CONNECTICUT 06141-0270 L L J CZ ".'%,7 0,'.C~, (203) ess-sooo August 29,1985 Docket No. 50-423 F0788A Dr. Thomas E. Murley Regional Administrator U.S. Nuclear Regulatory Commission Region I 631 Park Avenue King of Prussia, PA 19406

Reference:

(1) 3. F. Opeka letter to T. E. Murley, F0779A, dated June 6,1985.

Dear Dr. Murley:

Millstone Nuclear Power Station, Unit No. 3 Reporting of Potential Significant Deficiencies '

in Accordance with 10CFR50.55(c):

Core Exit Thermocouples (SD-82) in a May 9,1985 telephone conversation between your Mr. T. Rebelowski and our Mr. R.K. McCarthy, Northeast Nuclear Energy Company reported a potential significant deficiency in the construction of Millstone Unit No. 3 in accordance with 10CFR50.55(e). The potential significant deficiency involved the core exit thermocouple system provided by Westinghouse.

As noted in Reference (1), while performing equipment qualification testing of the core exit thermocouples, Westinghouse noted the total system error exceeded the errors assumed in the Westinghouse Emergency Response Guidelines. Westinghouse has been performing an environmental qualification test on the core exit thermocouples, connectors, potting adapters, splices and reference junction boxes. The qualification test results are not complete at this time.

8509250173 850829 PDR ADOCK 05000423 S PDR 1

s D IE A7

As such, until additional information is obtained, the corrective action and final report cannot be provided. We will provide an update 'on this matter by September 30,1985.

Very truly yours, NORTHEAST NUCLEAR ENERGY COMPANY JE OmA

3. F. Opeka Senior Vice President A L 1.s/

By: E. 3 :ika ()

Vice Presid cc: Mr. 3.M. Taylor, Director Division of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, DC 20555 1

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