ML20128H089

Final Deficiency Rept SD-72 Re Installation of Foxboro Transmitters.Initally Reported on 850118.Util Will Rework Conduit for Transmitter by 850731 to Include Drain Holes Per Instruction Manual

ML20128H089
Person / Time
Site:	Millstone
Issue date:	05/10/1985
From:	Opeka J NORTHEAST NUCLEAR ENERGY CO., NORTHEAST UTILITIES
To:	Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
F0732A, F732A, SD-72, NUDOCS 8505300414
Download: ML20128H089 (2)

Text

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4 NOItTlW.AST 8375LITIES o.nere Onic.. semen street. Berun. connecticut 9 Os!I i

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ees U~ P.O. box 270 HARTFORD, CONNECTICUT 06141-0270 L L J C,[T,07',17,'c;- (203) ses-5000 I

May 10,1985 Docket No. 50-423 F0732A Dr. Thomas E. Murley Regional Administrator U. S. Nuclear Regulatory Commission Region I 631 Park Avenue King of Prussia, PA 19406

References:

(1) W. G. Counsil letter to T. E. Murley, F0676A, dated February 15,1985.

(2) W. G. Counsil letter to T. E. Murley, F0701A, dated March 29,1985.

Dear Dr. Murley:

Millstone Nuclear Power Station, Unit No. 3 Reporting of Potential Significant Deficiencies in Accordance with 10CFR50.55(e):

Foxboro Transmitters (SD-72)

In a January 18, 1985 telephone conversation between your Mr. T. Rebelowski and our Mr. L. Chiarizia, Northeast Nuclear Energy Company (NNECO) reported a potential significant deficiency in the construction of Millstone Unit No. 3 in accordance with 10CFR50.55(e). The potential significant deficiency involves the installation of Foxboro transmitters.

The Foxboro Instruction Manual requires that a drain hole be drilled into the conduit to prevent moisture from accumulating in the transmitter junction box.

A NNECO engineering evaluation revealed that these drain holes were not present in the conduit for the installed Foxboro transmitters. Installation of the transmitters without this drain hole could cause the transmitters to fail.

As previously reported to you, there are only two (2) safety-related Foxboro transmitters installed at Millstone Unit No. 3. We have completed our evaluation and determined that this condition does not represent a significant deficiency for Millstone Unit No. 3 for the following reasons:

(1) in the unlikely event that moisture did accumulate inside the conduit, it would not collect inside the transmitter junction box due to the particular configuration of the conduit. However, NNECO will rework the conduit for these two transmitters by the end of July 1985 to include the drain holes in accordance with the Foxboro Instruction Manual.

8505300414 850510 PDR S ADOCK 05000423 gO '/

PDR 16 #

-(2): The~ two ?)xboro transmitters have overlapping ranges which provide'one train of RCS pressure. In the event these . transmitters should fail, .an additional train utilizing another type of transmitter will pre * , the same safety function.~ Hence, failure of these transmitters would not adversely.

affect the' safe operation of the plant.

'We consider this to be 'our final report for SD-72. We trust that the above

-information satisfactorily responds to your concerns.

Very truly yours, NORTHEAST NUCLEAR ENERGY COMPANY i

L F. o

3. F. (1pekd U A.

Senior Vice President cc: Mr. 3. M. Taylor, Director -

Division of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, D. C. 20555

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