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)

Text

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CATEGORY T SO 00CKET NUMBER EVENT DATE REPORT DATE O 1 CONT l h I Ol 7 8 57 58 59 W60 l Ol 6la l-lol31/ lA l Il 12l2I91715l 61 68 69 74 lol/I/l'3l7IGl 75 80 EVENT DESCRIPTION .

DE lb> rib' n ota sh. h un i Ac ym d e t. c ooI&n , e t e ,- w de m reacfor I 7 89 ' '

80 SE l b oitd 6 ' iscia L e va\ue CV-2233 t e o\d nel det o c a.m e hiv 'l 7 89 '

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7 8 khJ 9 10 lololol I 12 13 NA I 44

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ACTMTV CON' TENT RELEASE 0 0F RELEASE AMOUNT OF ACTMTV 5 8

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45 LOCATON OF PELEASE uA I 80 g PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTON DE lololol Lal I NA I 7 89 11 12 13 80 i PERSONNEL INJURIES NUMBER OESCRIPTON

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. DE ~ lo lo l ol I NA l l 7 89 11 12 80 l OFFSITE CONSEQUENCES BB I NA I 7 89 I 80 LOSS OR OAMAGE TO FACit.lTY -

TYPE CESCRIPTON D2 LFJ l NA I l

7 89 10 80 PUBUCITY 3l89 N A. '

N A001TIONAL FACTORS I NA 800411' oho I 7 89 80 Xl I NAuE: Ib e.1 # kI;ll,$,u, -

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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:

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 Power Operation j Routine Startup ~~ l 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 reactor. building isolation valve, CV-2233, would not close remotely from ,;

the control room. An investigation was made and the air supply to the 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 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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C l A6 normal Occurrence Report No.- 50-313/75-11 Y

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, 8. Designation of Apparent Cause of Occurrence:

4 Design Procedure

Manufacture Unusual Service Condition Including Environmental

, Installation /

• l Construction Component Failure. .

1 Operator X

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Other (specify) ,

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: ,

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

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- March 4, 1975 NSP-10, Rev. 2 Page 3Of4 i

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

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10. Corrective Action:

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:  !

1 None

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

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