ML20070Q940

Application for Amends to Licenses DPR-77 & DPR-79, Requesting TS Change 93-18,revising Normal Alignment to Automatic Tap Changing Common Station Service Transformers

ML20070Q940
Person / Time
Site:	Sequoyah
Issue date:	05/16/1994
From:	Powers K TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML20070Q944	List: ML20070Q940 ML20070Q946
References
NUDOCS 9405190273
Download: ML20070Q940 (2)

Text

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' I HA Tennessre Vaney Aumonty, Post Offce Box 2000, SodteDaisy. Tennessee 37379 2000 4

Ken Powers vce Prwjent, Saw Nuclear Plant May 16, 1994 TVA-SQN-TS-93-18 10 CFR 50.90 U.S. Nuclear Regulatory 'lommission ATTN: Document Control 1esk Washington, D.C. 20555 Gentlemen:

In the Matter of ) Docket Nos. 50-327 Tennessee Valley Authority ) 50-328 SEQUOYAH NUCLEAR PLANT (SQN) - TECIINICAL SPECIFICATION (TS) CHANGE 93-18,

" REVISION FOR NORMAL ALIGNMENT TO AUTOMATIC TAP CHANGING COMMON STATION SERVICE TRANSFORMERS" In accordance with 10 CFR 50.90, we are enclosing a requested amendment to Licenses DPR-77 and DPR-79 to change the TSs of SQN Units 1 and 2.

The proposed change revises Surveillance Requirement 4.8.1.1.1.b to clarify the test requirements. This clarification is the result of the installation of common station service transformers with auto load tap changers and their use as the normal power supply for the 6.9-kilovolt (kV) unit boards. The installation of the transformers has been completed and the new alignment will be implemented during the Unit 2 Cycle 6 refueling outage. The change to the normal alignment will resolve a SQN cotanitment to NRC i.Lat corrects a potential bolted i three-phase fault current problem on the 6.9-kV unit board load breakers. This TS rev!sion is a clarification of existing requirements that are being presently maintained.

The proposed TS change is identified in Enclosure 1. The justification for the proposed TS change is provided in Enclosure 2. .A proposed determination of no significant hazards consideration performed pursuant to 10 CFR 50.92 is provided in Enclosure 3.

I 94h51?O273940516 PDR P

ADOCK 05000327 PDR g, y()Q l { l

U.S. Nuclear Regulatory Commission Page 2 May 16, 1994 TVA requests a 45-day implementation period for this TS change'following issuance.

Please direct questions concerning this issue to K. C. Weller at (615) 843-7527.

Sincere ,

)k Ken Powers Sworn to ' pnd subscribed before me this /dl!L day of W% 1994 ME b Notary Pub'lic My' Commission Expires 8,!97 Enclosures cc (Enclosures):

Mr. D. E. LaBarge, Project. Manager U.S. Nuclear Regulatory Commission One White Flint, North 11555 Rockville Pike Rockville, Maryland 20852-2739 Mr. Michael H. Mobley, Director (w/o Enclosures)

Division of Radiological Health 3rd Floor L & C Annex 401 Church Street Nashville, Tennessee 37243-1532 NRC Resident Inspector Sequoyah Nuclear Plant 2600 Igou Ferry Road Soddy-Daisy,' Tennessee 37379-3624 Regional Administrator U.S. Nuclear Regulatory Commission Region II 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323-2711 1]