ML19319E536

AO 50-313/75-11:on 751229,intermediate Cooling Water Sys Reactor Bldg Isolation Valve CV-2233 Failed to Close Remotely from Control Room.Caused by Operator Failing to Make Proper Valve Lineup Verification Per Standing Order 3

ML19319E536
Person / Time
Site:	Arkansas Nuclear
Issue date:	01/13/1976
From:	David Williams ARKANSAS POWER & LIGHT CO.
To:
Shared Package
ML19319E529	List: ML19319E528 ML19319E536 ML19319E540
References
NUDOCS 8004110800
Download: ML19319E536 (4)

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1. Abnormal Occurrence Report No. 50-313/75/11

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2. Report Dato: 1/13/76 3. Occurrence Date: 12/29/75

4. Facility: Arkansas Nuclear One-Unit 1 Russellville, Arkansas

5. Identification of Occurrenec:

Reactor Building Isolation valve CV-2233, failed to close. ,

6. Conditions Prior to Occurrence:

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Steady-Stato Power Reactor Power 0 Mh'th ibt Standby Not Output 0 MNe Cold Shutdown X Percent of Fu'11 Power 0 g Refueling Shutdown _ Load Changes L1uring Routinc

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Power Operation j Routine Startup ~~ l

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Operation 1 Routinc Shutdown Operation -

5 Other (specify) i,

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7. Description of Occurrence:

At-1658 hours on December 29, 1975, the intermediate cooling water system

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reactor. building isolation valve, CV-2233, would not close remotely from ,;

the control room. An investigation was made and the air supply to the

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operator was found isolated and the valve held open by a handjack pre-venting it from closing. It appears this condition has existed since the

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week of October 26, 1975, when the. plant was shutdown for control rod repatch.

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. March 4, 1975 NSP-10,' Rev. 2 Page 2 of 4 a _

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l C l A6 normal Occurrence Report No.- 50-313/75-11 Y

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, 8. Designation of Apparent Cause of Occurrence:

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Design Procedure

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Manufacture Unusual Service Condition

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Including Environmental

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• l Construction Component Failure. .

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Operator X

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Other (specify) ,

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The operaitor apparently failed to make proper valve line up verification per Standing Order No. 3 which requires the operator to insure air is available to,the operator and all manual overrides are removed.

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9. . Analysis of Occurrence: ,

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Since the redundant isolation valve was operable, this incident did not affect the health and safety of the public.

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• Abnormal Occurrence Report No. 50-313/75-11 4

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10. Corrective Action:

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l 4 The correct valve alignment was made and all other remotely operated i safety related valves were checked and verified overable. This incident will be discussed with the operators to assure they'are all familist with l l

how to"make a valve line up verification.

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11. Falliire Data:  !

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March ~4, 1975 NSP-10, Rev. 2 Page 4 e ea

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