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Revised Monthly Operating Rept for May 1987
	ML20237J574
Person / Time
Site:	Vogtle
Issue date:	05/31/1987
From:	Dilworth S; GEORGIA POWER CO.
To:	;
Shared Package
ML20237J554	List: ML20237J551; ML20237J564; ML20237J574; ML20237J582;
References
	NUDOCS 8708180239
	Download: ML20237J574 (5)
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l ATTAC) MENT l

A - Cause/B - Corrective Action to Prevent Reoccurrence 4 April - #7 and #1 A. ! The root cause of both of these reactor trips was a faulty bistable circuit board 09 the process protection rack (7300 panel ) . The faulty board caused OP AT and OTAT Bistables trips.

B. The faulty bistable circuit board was replaced and the entire ;

channel of the process control system was retested to confirm i operability.

?

2 A. The root cause of this trip was procedural inadequacy in that a test procedure did not provide adequate direction concerning operation of the turbine generator controller during the test. :

Secause of an over shoot to 82 percent in reactor power the main -

feedwater pump operating in automatic could not maintain steam ;

generator water level and resulted in a Reactor Trip on low low '

level.

B. Startup Test Procedure 1-6SC-02 " Load Swing Test" was clarified to contain specific guidance on how the turbine generator load limit set potentiometer was to be adjusted.

3 A. Root cause of the trip was an inadequacy in work instructions for performing maintenance on MSIV's while operating at power.

The 1000 1 MSIV was improperly blocked open and slamed shut causing steam generator #1 to reach the low low level setpoint.

B. Guidelines describing proper methods to maintain valve . position while performing maintenance on main steam isolation valves (MSIVs) (FWIVs) and ( ARVs) have been established and provided to Work, Planning and Maintenance Engineering for reference.

4 A. The cause of this trip was operator error. A non-safety related i manual isolation valve in the #3 bypass feedwater regulating valve piping was left closed.

l B. The unit Operating Procedure was changed to include an independent verification of important feedwater valves.

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AVERAGE DAI;Y L3IT POWER LEVEL a DOCKET No. 50-424 L3IT No. Vogtle 1 DATg 7/21/87 COMPLETED BY S. C. Dilworth 2LEPHONE- (404) 724-8114 L

MONTH May 1987 j DAY AVERAGE DAILY POWER LEVEL DAY AVEPAGE DAILY POWER LEVEL (MWe-Net) (MWe-Nec) 1 541 17 0 2 775 13 0_

3 778 19 0 4 373 20 5 21 .o.

6 149 22 _o. l 7 788 23 _

n. i I

8 790 24 _n.

25 696 9 66 26 965 10 265

, 11 768 27 1952 791 23 1060 12 79 29 1079 l 13 14 30 1064 l 15 31 1068 l 16 E-4 l 4

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ML20237J574

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