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c0000o00o00000cc000ccc00c0 Report Period April [J85 UNIT SHUTDOWNS / REDUCTIONS 0

Byron 1 0

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Date h Hours Reason Method LER Number System en=panent Cause & Corrective Action to Prevent Recurrence 10 4/2/85 F

32.1 G

3 85-039 Feedwater Pump Flow was lost due to procedural error while performing initial controller transfer to AUTO. Procedure was revised to Correct.

11 4/10/85 F

62.1 A

3 85-042 Reactor Trip due to dropped control rods.

Faulty Rod Control Logic Cabinet card replaced.

12 4/15/85 S

24.4 B

2 Startup Test Sequence (Plant Trip from 25%

Power) i 13 4/21/85 F

25.2 A

3 85-046 Reactor Trip on Low-Low Steam Generator Level due to a sticking relay following ESFAS surveillance. The faulty relay was replaced.

1 I.

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Summary Byron 1 completed its 30% Startup Test Sequence and is in its 50% test sequence.

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TYPE Reason Method System & Component F-Forced A-Equip Failure F-Admin 1-Manual Exhibit F & H

( S-Sched B-Maint or Test G-Oper Error 2-Manual Scram Instructions for j

C-Refueling H-Other 3-Auto Scram Preparation of j

D-Regulatory Restriction 4-Continued Data Entry Sheet E-Operator Training 5-Reduced Load Licensee Event Report

& License Examination 9-Other (LER) File (NUREG-0161)

I B506070704 850528 POR ADOCK 05000454 R

) (0625M)

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ML20129H973