ML19308D489

RO-77-87:on 770715,containment Isolation Valve WDV-94 Failed to Operate During Quarterly Cycling Procedure SP-370. Caused by Dirty Limit Switch Contacts.Contacts Cleaned & WDV-94 Operability Restored

ML19308D489
Person / Time
Site:	Crystal River
Issue date:	08/08/1977
From:	Stewart W FLORIDA POWER CORP.
To:
Shared Package
ML19308D484	List: ML19308D483 ML19308D489
References
NUDOCS 8002280796
Download: ML19308D489 (2)

Text

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gg l containment isolation valve WDV-94 failed to operate, contrary to Tech Spec 3.6.3'.1. ..

g f Redundancy maintained with other available waste disposal valves. First time occurrence.

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M l Maintenance restored the operability of WDV-94 in four hours.

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foJe} l This event was due to dirty limit switch contacts. The limit switch contacts were cleaned 7 89 E.--

as l restoring operability of WDV-94. .

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~7 8"9 SEE ATTACHED SUPPLEMENTARY INFORMATION ',

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- NAME, W. P. Stewart ,\ \

PHONE: 813/866-4159 p - ,

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r SUPPLEMENTARY INIVRMATION v .

1. Report No.: 50-302/77-87 ,

2. Facility: Crystal River Unit #3

3. Report Date: 8 August 1977,

4. Occurrence Date: 15 July 1977

5. Identification of Occurrence:

Containment isolation valve WDV-94 was inoperable contrary to Technical Specification 3.6.3.1. _

6. Conditions Prior to Occurrence:

Mode 1 power operation.

7. Description of Occurrence:

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At 0700, while performing the quarterly cycling of valves Surveillance Procedure 5-SP-370, valve WDV-94 failed to operate. The 4 hour4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> action statement was entered.

Maintenance was performed and valve restored operable within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />.

8. Designation of Apparent Cause:

This event was due to the limit switch contacts being dirty. The contacts were cleaned and valve restored operable.

9. Analysis of Occurrence:

There was no safety implications due to this event, as a redundant waste disposal valve was used to isolate the system.

10. Corrective Action:

None required as normal maintenance restored the valve's operability.

11. Failure Data:

This was the first time valve WDV-94 had failed to operate..

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