ML19263B940
| 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: |
| References | |
| 1-019-5, 1-19-5, NUDOCS 7901250164 | |
| Download: ML19263B940 (1) | |
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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
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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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