ML20006F728

Forwards Monthly Operating Repts for Jan 1990 & Dec 1989 for Sequoyah Nuclear Plant Units 1 & 2

ML20006F728
Person / Time
Site:	Sequoyah
Issue date:	02/15/1990
From:	Michael Ray TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML20006F730	List: ML20006F728 ML20006F736 ML20006F738
References
NUDOCS 9003010065
Download: ML20006F728 (2)

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TENNESSEE VALLEY AUTHORITY '

CHATTANOOGA. TENNESSEE 37401 SN 1578 Lookout Place FEB 151990 U.S. Nuclear Regulatory Commission ATTN: Document Control Dest Washington, D.C. 20555 Gentlemen:

In the Matter of ) Docket Nos. 50-327 Tennessee Valley Authority ) 50-328 SEQUOYAH NUCLEAR PLANT (SQN) - JANUARY 1990 MONTHLY OPERATING REPORT Enclosure 1 1s the January 1990 Monthly Operating Eeport as required by SQN Technical Specification 6.9.1.10.

As the result of an administrative error, an incomplete December 1989 report was transmitted to NRC by letter dated January 16, 1990. A complete December 1989 report is also provided as Enclosure 2.

If you have any questions concerning this matter, please call R. R. Thompson at (615) 843-7470.

Very truly yours, TENNESSEE VALLEY AUTHORITY b., Nucle

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Manag L ' censing and Regulatory Affairs Enclosures cc (Enclosures):

INPO Records Center Mr. Ted Marston, Director Institute of Nuclear Power Operations Electric Power Research Institute 1100 Circle 75 Parkway, Suite 1500 P.O. Box 10412 Atlanta, Georgia 30389 Palo Alto, California 94304 Regional Administration Mr. B. A. Wilson, Assistant Director U.S. Nuclear Regulatory Conct ssiu for Inspection Programs Office of Inspection and inforcement TVA Projects Division Region II U.S. Nuclear Regulatory Commission 101 Marietta Street, NW, Suite 2900 Region II Atlanta, Georgia 30323 101 Harletta Street, NW, Suite 2900 Atlanta, Georgia 30323 Mr. B. D. Llaw, Director TVA Projects Division NRC Resident Inspector One' White filnt, North Sequoyah Nuclear Plant 11555 Rockville Pike 2600 Igou ferry Road Rockville, Maryland 20852 Soddy Daisy, Tennessee 3/ilJ h

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SUMMARY

, .. . JANUARY 1990 I UNIT 1

. Unit i generated 827,770 MWh (gross) of electrical power during January with  ;

a capacity factor of 94.05 percent. At the beginning of the month, the unit ,

was operating at approximately 75 percent power to extend the life of the core, On January 2, 1990, at 0209 (EST), the power level was decreased for  :

further maintenance on FCVs 6-105 and 6-106. The reactor reached 65 percent  !

power at 0343 (EST), on January 2, 1990, and maintained that power level untli maintenance was complete. The power level increase was initiated on January 3, 1990, at 0623 (EST), and the unit reached 75 percent power at 0816 (EST) that day. Ths power level was held again at 75 percent to extend the life of the core.

On January 7, 1990, at 1146-(EST), the SOS directed the unit operator to begin increasing the reactor power level. The unit reached 100 percent power at 1745 (EST), that day.

On Januery 10, 1990, at 1933 (EST), Unit i experienced a turbine runback from 100 percent _ power to approximately 75 percent power. The turbine runback was inttlated by HDT 3 bypassing to the condenser because of a high level in the HDT 3. _The initiating event that caused the HDT 3 level fluctuation was the

, . intermediate Heater B string isolation. The feedwater heater string isolation

.was caused by a high-high level in feedwater Heater 18-2, as a result of the feedwater Heater 18-2 LCV controller failure.

Feedwater Heater IB-2 LCV controller failure has been determined to have been caused by the malfunction of the controller air relay. The air relay failure caused the feedwater heater LCV to close, resulting in a high-high feedwater heater level and resulting intermediate Heater B string isolation.

Unit i reached 100 percent power again at 1123 (EST).._on January 11, 1990, and continued to operate at approximately 100 percent power through the end of January.

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