ML19326B338

AO 50-313/74-03:on 740706,reactor Bldg Purge Control Isolation Valve CV-7402 Failed in mid-position During Surveillance Stroke Test.Caused by Rusted & Unlubricated Lower Bearing.Valve Operator Cleaned & Lubricated

ML19326B338
Person / Time
Site:	Arkansas Nuclear
Issue date:	07/16/1974
From:	Reuter D ARKANSAS POWER & LIGHT CO.
To:
Shared Package
ML19326B336	List: ML19326B335 ML19326B338 ML19326B341
References
NUDOCS 8004150718
Download: ML19326B338 (3)

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1. Abnormal Occurrence Report No. 50-313/74-3

2. _ Report Date: July 16, 1974 3. Occurrence Date: July 6, 1974

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

5. Identification of Occurrence: Reactor Building Purge Control Isolation Valve CV-7402 failed in mid position during a surveillance stroke test.

6. Conditions Prior to Occurrence:

Steady-State Power Reactor Power 0 MNth llot Standby Net Output 0 MWe Cold Shutdown X Percent of Full Power 0  %

, Refueling Shutdown I

j Routine Startup l Operation Routine Shutdown Operation -

Load Changes During Routine Power Operation Other (Specify) Prior to Initial Criticality

7. Description of Occurrence

On July 6,1974, at 2020 hours0.0234 days <br />0.561 hours <br />0.00334 weeks <br />7.6861e-4 months <br />, isolation valve CV-7402 was stroked per surveillance procedure 1304.70. The ,,

valve failed in mid position. The other reactor building iso 1~ation valve in the line (CV-7404). was also tested per OP 1304.70 and found to be operable.

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O U. -Abnormal Occurrence Report No. 50-313/74-3 Sheet 2 i 8. Designation of Apparent Cause of Occurrence:

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, Design Procedure Ahnufacture Unusual Service Condition Including Installation / X Environmental Construction Component Failure- X Operator Other (Specify) _

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The valve operator was removed, dismantled, and examined. The lower bearing was frozen due to rust and lack of lubrication. Lack of lubrication and the operation of the valve had destroyed the 0-Ring grease seal, allowing moisture to enter the bearing and preventing subsequent greasing of the bearing.

9. Analysis of Occurrence: '

At the time of the occurrence reactor building integrity was not

( required, the redundant valve was operable, and initial criticality had not been reached. No safety implications were involved and the health and safety of the public were not endangered.

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10. Corrective Action:

The valve operator was disassembled, cleaned, reassembled and lubricated. __

Permanent grease nipples have been installed. The valve has been ~

stroked to assure its operability. g i

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July 5, 1974 NSP-10, Rev. O Page 2 of 3

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Abnormal Occurrence-Report No. 50-313/74-3 Sheet 3

, 11. Failure Data:

There have been no previous failures of this type and it is believed to be an isolated case. The failed component identification is as follows: 'Robotarm. actuator, Serial No. 11768-2, maximum working pressure 80 psi.

12. Reviews and Approvals:

Reviewed.and Appioved by: Plant Safety Committee Yes (X) No ( )

Plant Superintendent Yes (X) No ( )

Reference:

JWA-394 Date: 7/12/74 Reviewed by: ,7, m Date: t d 7Y Licensing Supervisor #

Approved by: Ph., 4 . ~. [ 4 Date: N/I- 7/

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/ fety'Revi Co. ittee /

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Approved by: A (

Date: 7/6 77 i l

',. anager of NElear Serv'ces ' ' #

Approved by:(j,)?// J/4f rc .,

Date: 'ib .iY

[ Directoro[PowerProduction

~2 Approved oy: .r .

1. Date:- -

'. / Senior Vice President .

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