ML20237J574

Revised Monthly Operating Rept for May 1987

ML20237J574
Person / Time
Site:	Vogtle
Issue date:	05/31/1987
From:	Dilworth S GEORGIA POWER CO.
To:
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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.

?

1. 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.

1. 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.

1. 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.

E-3a L

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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

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l 6

149 22

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n.

i 7

788 23 I

8 790 24

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9 66 25 696 10 265 26 965

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

16 E-4 l

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