ML19263B940

Forwards Monthly Operating Rept for Dec 1978

ML19263B940
Person / Time
Site:	Arkansas Nuclear
Issue date:	01/12/1979
From:	David Williams ARKANSAS POWER & LIGHT CO.
To:	Haller N NRC OFFICE OF MANAGEMENT AND PROGRAM ANALYSIS (MPA)
Shared Package
ML19263B941	List: ML19263B940 ML19263B942
References
1-019-5, 1-19-5, NUDOCS 7901250164
Download: ML19263B940 (1)

Text

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$4lA AAKANSAS POWER & LIGHT COMPANY PCST OFFICE BOX 551 UTTLE ROCK. ARKANSAS 72203 (501) 371-.1000 January 12, 1979 1-019-5 Mr. Norman M. Haller, Director Office of Management Information and Program Control ,

U. S. Nuclear Regulatory Commission Washington , D. C. 20555

Subject:

Arkansas Nuclear One-Unit 1 Docket No. 50-313 License No. DPR-51 Monthly Operating Report (File: 0520.1)

Gentlemen:

Attached find the Monthly Operating Report for December 1978 for Arkansas Nuclear One - Unit 1.

This report includes an adjustment of 12MWH in the year-to-date and cumulative totals for both the gross and et electrical energy generated to correct recently discovered errors, very truly yours, .

, Y l .1 *b Daniel H. Williams Manager, Licensing DHW:REI:tw Attachments cc: Mr. K. V. Seyfrit, . Director Office of ' Inspection & Enforcement U. S. Nuclear Regulatory Commission Region IV 611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 76011 Mr. John G. Davis, Acting Director [ D Office of Inspection a. Enforcement ,

a Washington, D. C. 20555 /

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NRC M0tiTHLY OPERATIriG REPORT OPERATING'SUMt'ARY - DECEMBER,1978 9

t UNIT 1 The unit. operated at approximately 100% reactor pcwer until 12/20, at 0200 hours0.00231 days <br />0.0556 hours <br />3.306878e-4 weeks <br />7.61e-5 months <br />, when a Main Feedwater Pump Vent valve bonnet blew off re- -

sulting in an unisolatable steam leak. The unit load was reduced to 40% power to remove the pump from service for repairs. At 1045, af ter the unit was stabilized at 37% reactor power, a main turbine governor valve LVDT failed causing a loss o/ valve position control signal.

The resulting incorrect signal caused the turbine electro-hydraulic control system to move the associated governor valve 100% open and re-duced steam line pressure sufficiently to trip the Steam Line Break Instrumentation and Control System (SLBIC), which tripped the turbine .

and the. reactor. The. unit was placed back on line 12.9 hours1.041667e-4 days <br />0.0025 hours <br />1.488095e-5 weeks <br />3.4245e-6 months <br /> later.

The Unit operated at approximately 90% reactor power until 12/31, when at 850 the main turbine developed a high vibration, The uni t was man-ually tripped. Initial investigation revealed damage to the L-2 row of blading. Unit shutdown continued throughout the remainder of the re-port period.

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