ML19267A345

LER 78-022/01T-0 on 781219:safety Group Control Element Assembly A-52 Stopped Withdrawing at 144 Inches Withdrawn. Caused by Failed Lift Coil

ML19267A345
Person / Time
Site:	Arkansas Nuclear
Issue date:	01/03/1979
From:	Shively C ARKANSAS POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19263B246	List: ML19267A343 ML19267A345
References
LER-78-022-01T, LER-78-22-1T, NUDOCS 7901150071
Download: ML19267A345 (4)

Text

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1.

Repor?4ble Occurrence Report TJo. 50-368/7t!-22

2. Report Date: 01-03,79 3. Occurrence Date: 12-19 78 4 Facility: Arkansas Nuclear One-Unit 2 Russellville, Arkansas

5. Identification of Occurrence:

This ROR concerns the failure to take corrective action required by technical specification 3.1.3.1.

6 Conditions "rior to Occurrence:

Steady-State Power Reactor Power MWth Hot Standby X Net Output

_ HWe Cold Shutdown Percent of Full Power  %

Refueling Shutdown load Changes During Routine Power Operation Routine Startup Operation Routine Shutdown Operation Other (speci fy)

7. Description of Decarrence:

During approach to criticality, safety group CEA A-52 stopped withdrawal at approximately 144 inches withdrawn due to a failed lift (011.

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Reporta>1e Occurrence Report No. 50-368/78-22

8. Designation of Apparent Cause of Occurrence:

Design Procedure Ibnufacture Unusual Service Condition including Environmental Installation /

Const ruct ion Component Failure (See Failure Data)

Operator Other (specify) X NRC inspector interpretation of technical specification

9. Analysis of Occurrence:

1he CEA was known to be trippabic, aligned within 7 inches of other group A rods, and was within limits for full out position; Therefore, the CEA was considered as operational, and mode 2 operation was established.

Reportable Occurrence Report No. 50-368/78-22

10. Corrective Action:

With the NRC ruling that the CEA was inoperabic, the plant should have confomed with the requirements of action statement T.S. 3.1.3.1.c, which would not allow the mode change from 3 to 2.

11. Failure Data:

'Ihis incident did not endanger the health and safety of the public since the CEA was trippable and is considered an isolated occurrence.