ML20212N470

Submits Addl Info Re 870130 Application for Amend to License NPF-49,revising Tech Specs to Extend Diesel Generator 18-month Surveillance Testing Requirements,Per 870224 Telcon

ML20212N470
Person / Time
Site:	Millstone
Issue date:	03/06/1987
From:	Mroczka E, Sears C NORTHEAST NUCLEAR ENERGY CO., NORTHEAST UTILITIES
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
B12448, TAC-66377, NUDOCS 8703130037
Download: ML20212N470 (3)

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• General Offices

• Selden Street. Berlin, Connecticut 1 s I E Yes"sacracc U " P.O. BOX 270

.aos arema c"" HARTFORD, CONNECTICUT 061414270 L t  ; C',",'",1' ,'00,C". (203) 665-5000 March 6,1987 Docket No. 50-423 B12448 Re: 10CFR50.90 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, D.C. 20555 Reference; (1) E. 3. Mroczka letter to U.S. NRC , Diesel Generator 18-Month Surveillance Requirements, dated January 30,1987.

Gentlemen:

Millstone Nuclear Power Station, Unit No. 3 Amendment to Facility Operating License No. NPF-49 Supplemental Information - Diesel Generator 18-Month Surveillance Requirements On January 30,1987, Northeast Nucler.r Energy Company (NNECO) submitted a proposed amendment to facility Operating License NPF-49 for Millstone Unit No. 3 (Reference 1). That amendment would revise the Technical Specifications for Millstone Unit No. 3 to extend on a one-time basis the 18-month surveillance testing requirements up to 4 months beyond the maximum allowed by Technical Specification Section 4.0.2. This would allow the plant to complete the present fuel cycle and shut down on or before January,1988. This extension is for the Diesel Generator which must be tested during an extended outage.

In a telephone conference on February 24, 1987, the NRC Staff requested that NNECO provide additional information regarding that amendment request.

NNECO hereby provides the following information to the Staff's concerns.

Within many of the surveillance requirements for systems and components for Millstone Unit No. 3, a frequency of 18 months is specified. Many of the surveillances clearly state, "18 months at shutdown", which we believe was intended to indicate that the tests were to be done during the refueling outage.

The subject surveillance test is currently due in May,1987, but the refueling outage is not scheduled to begin until about January,1988. The surveillance requirements contained in the existing Technical Specifications are designed to assure that the quality of the equipment and components is maintained so that the facility operation will be within the safety limits, and the limiting conditions for operation of the system wi!! be met. NNECO has determincd that the total time of the diesel generator inoperability for this inspection would be in excess of the current 72-hour Technical Specification limit. The time required to s

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i U. S. Nuctur Rtgulatary Ccmmission B12448/Page 2 -

March 6,1987 disassemble and reassemble one diesel generator is estimated to be 8 days (20 hours2.314815e-4 days <br />0.00556 hours <br />3.306878e-5 weeks <br />7.61e-6 months <br /> / day). A typicalinspection would include:

o Pulling pistons o Inspection of the injectors o e inspection of the cylinders o Boroscop/

Removal inspection of the main bearings o Inspection of the thrust bearings o Drain, manual cleaning and inspection of the tube oil sump o Generator inspection o Required corrective / preventive maintenance of auxiliary system equipment.

o Drain and refill turbocharger The Vendor run (run-in warm-up procedure) and surveillance runs to declare the diesel opeiable would take approximately 4 days. Thus the total time of each diesel generator inoperability for this inspection would be approximately 12 days.

Therefore, in order to avoid the possibility of not meeting the operability requirements for a Limiting Condition for Operation, it is desirable to perform this inspection in an extended outage and therefore a one-time extension of the 18-month diesel generator inspection will be necessary. In addition, considering

- the time duration and work scope of the upcoming March,1987 maintenance outage, NNECO has determined that this inspection should be done during the first refueling outage scheduled to begin on or about January 1988.

We believe the above information coupled with the information provided in Reference'(1), provides a complete basis for granting the requested surveillance extension. Of course, should the Staff have any additional questions, NNECO will be available to discuss the Staff's concerns.

Very truly yours, NORTHEAST NUCLEAR ENERGY COMPANY

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Q E. 3. Mroczka Senior Vice President L

By: C. F. Sears Vice President cc Dr. T. E. Murley, Region 1

3. T. Shediosky, Senior Resident Inspector, Millstone Unit No. 3 E. L. Doolittle, NRC Project Manager,- Millstone Unit No. 3 L_

U. S. Nucle:r Regulatory Ccmmission B12448/Page 3 March 6,1987 =

Kevin McCarthy Director, Radiation Control Unit Department of Environmental Protection Hartford, Connecticut - 06116 STATE OF CONNECTICUT )

) ss. Berlin COUNTY OF HARTFORD )

Then personally appeared before me C. F. Sears, who being duly sworn, did state that he is Vice President of Northeast Nuclear Energy Company, a Licensee herein, that he is authorized to execute and file the foregoing information in the name and on behalf of the Licensees herein and that the statements contained in said information are true and correct to the best of his knowled e and belief.

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