ML20092F074

Monthly Operating Rept for Dec 1991 for Clinton Power Station Unit 1,clarifying Unit Shutdown Summary to Inform That Sensors Failed Not Logic Components

ML20092F074
Person / Time
Site:	Clinton
Issue date:	12/31/1992
From:	Spangenberg F ILLINOIS POWER CO.
To:
Shared Package
ML20092F051	List: ML20092F059 ML20092F074 U-601933, Forwards Monthly Operating Rept for Jan 1992 & Rev for Dec 1991 for Clinton Power Station Unit 1
References
NUDOCS 9202190073
Download: ML20092F074 (1)

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Attachment 2 j to U- 601933 *' . I

0T4 Page 1 of 1

@@ UNIT SHU'rDOWNS'AND POWER REDUCTIONS M DOCKET NO. 50-461 j

>c UNIT Clinton 1-oh DATE 01/31/92 Qy COMPLETED BY F. A. Spannenberz. III TELEPHONE (217) 935-8881 X3400 Of 00 REPORT MONTH December 1991 OM 10*

ND* TYPE METHOD OF SHUTTING DOWN F: FORCED DURATION THE REACTOR OR CORRECTIVE ACTIONS NO. DATE S: SCHEDULED [ HOURS) REASON (1) REDUCING POWER (2) / COMMENTS t

i j 91-06 911222 F 111.4 A: During a scheduled 2: Upon entering Repaired / replaced reduction in power 1( * , the restricted valve position the "B" Reactor Recirc zone of.the and velocity ulation Flow Control Valve power-flow feedback sensors (FCV) position feedback operating map, for the "A" and "B" loop failed, resulting in a manual scram Reactor Recircul-erratic FCV movement and a was inserted ation FCVs. -Follow -

decrease in reactor as required ing repairs, the core flow. The decrease by plant plant was returned in core flow placed the procedures. to power operation.

reactor in the restricted (See LER 91-008).

zone of the power-flow operating map. As a result, a manual reactor i scram'was inserted as f required by plant j procedures.

(1) Reason j A-Equipment Failure (explain), B-Maintenance or Test. C-Refueling D-Regulatory Restriction, E-Operator Training & License Examination, F-Administrative, G-Operational Error (explain),

H-Other (explain)

(2) Methodf 1-Manual, 2-Manual Scram, 3-Automatic Scram, 4-Other (explain)

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