ML20247G112

Requests Detailed Design Analysis Supporting Util 890331 Proposed Design Enhancements Involving Offsite Automatic Bus Transfer Sys & Replacement of Existing X-14 Transformer W/Larger,More Capable Transformer

ML20247G112
Person / Time
Site:	Maine Yankee
Issue date:	09/09/1989
From:	Leeds E Office of Nuclear Reactor Regulation
To:	Frizzle C Maine Yankee
References
TAC-M65492, NUDOCS 8909180369
Download: ML20247G112 (4)

Text

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UWITED STATES tl n NUCLEAR REGULATORY COMMISSION s j wAsmNGTON, D. C 20666

• • • • • [ September 9, 1989

Docket No. 50-309 M Mr. C. D. Frizzle, President Maine Yankee Atomic Power Company 83 Edison Drive Augusta, Maine 04336

SUBJECT:

SAFETY EVALUATION REPORT ON MAINE YANKEE 115 KV CAPACITOR BANK (TACM65492)

On March 31,1989,.you provided your design report on the recently installed 115 XV capacitor bank and' clarified plans for enhancements to the plant offsite power system. 'These enhancements. included consideration of installing a redundant transformer in parallel to the existing X-14 transformer and modification.'of the offsite automatic bus transfer system. Subsequently, you advised the staff that a parallel transformer may not be appropriate and current plans involve installation of a larger, more capable, station transformer.

The staff has' determined on the basis of Maine Yankee letter GDW-89-118, dated March 31 1989 and attachments, that the 115' KV capacitor bank installed at Maine Yankee sufficiently increases the power capability of the Suroweic transmission line such that it is fully capable of supporting worst case Maine Yankee loads together with extant offsite power loads when the Suroweic transmission line is the only 115 KV preferred power supply'to Maine Yankee.

Based on our review of your submittal, it appears that the Suroweic-transmission line is fully capable for a five-year period,- in accordance wit's

.your projections. By March 1994, you should demonstrate by load tracking, analysis, and any needed improvements that the Suroweic transmission line will remain . fully capable for another five years. Any time the Suroweic transmission line is not fully capable, it will not be used by Maine Yankee as though it were.

The staff requests that you provide the detailed design analysis supporting the previously proposed design enhancements involving the offsite automatic bus-transfer system and the replacement of the existing X-14 transformer with a larger, more capable, station transformer. We understand that these modifications are intended t: resolve previously documented concerns regarding offsite power supply to the emergency buses. Successful completion of these proposed design enhancements, as verified through staff inspection of the DFoi 8909180369 890909 r '

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offsite power supplies, their transfers, and the adequacy of onsite. safety

, system voltages, would bring the Maine Yankee offsite power configuration into full conformance with GDC-17.

Sincerely,

'" Eric J. eeds, Project Manager Project Directorate I-3 Division of Reactor Projects I/II Office of Nuclear Reactor Regulation ec: See next.page I

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'Mr. C. D. Frizzle L cc:

Mr. Charles B. Brinkman Mr. G. D. Whittier, Manager Manager - Washington Nuclear _ , Nuclear Engineering and Licensing Operations .. . Maine Yankee Atomic Power Company Combustion Engineering, Inc. 83 Edison Drive 12300 Twinbrook Parkway, Suite 330 Augusta, Maine' 04336

'Rockville, Maryland - 20852 John..A. Ritsher, Esquire-Ropes & Gray-225 Franklin Street Boston, Massachusetts 02110 State Planning Officer:

Executive Department 189 State Street-Augusta, Maine 04330 Dr. E. T. Boulette,'Vice President Operations and Plant Manager Maine Yankee Atomic Power Company P. O. Box 408 Wiscasset, Maine 04578 Mr. J. H. Garrity, Vice President Licensing and Engineering Maine Yankee Atomic Power Company 83 Edison Drive Augusta, Maine 04336 Regional Administrator, Region I U.S. Nuclear Regulatory Commission 475 Allendale Road King of Prussia, Pennsylvania 19406

.First Selectman of Wiscasset Municipal Building U.S. Route 1 Wiscasset, Maine 04578 Mr. Cornelius F. Holden Resident Inspector ,

Maine' Yankee Atomic Power Station U.S. Nuclear Regulatory Commission P. O. Box E Wiscasset, Maine 04578 Mr. P. L. Anderson, Project Manager Yankee Atomic Electric Company 580 Main Street Bolton, Massachusetts 01740-1398 i

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• 'J September 9, 1989

? Mr. C. . D'. Frizzle 2-f" P

o'f fsite power supplies, their transfers, and. the adequacy'of. onsite. safety

system voltages, would bring the Maine Yankee..offsite power configuration into D ' full,conformance'with GDC-17.

[. Sincerely, Eric J. Leeds, Project Manager Project Directorate I-3.

Division of Reactor Projects-Office of Nuclear Reactor Regulation l ,

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