ML19319E422

RO 50-313/76-33:on 761122,fire Sys Deluge Trip Rendered Diesel Generator 1 Inoperable.Caused by Leak Off of Sealing Pressure to Deluge Valve.Engine & Exciter Control Cabinets Dried & Deluge Valve to Be Shut to Ensure Sealing Pressure

ML19319E422
Person / Time
Site:	Arkansas Nuclear
Issue date:	12/10/1976
From:	David Williams ARKANSAS POWER & LIGHT CO.
To:
Shared Package
ML19319E410	List: ML19319E409 ML19319E422
References
FOIA-79-149 NUDOCS 8004100702
Download: ML19319E422 (4)

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I-Reportable Occurrence Report No. 50-313/76-33 4

2. Report Date: 12/10/76 3. Occurrence Date: 11/22/76 4

Facilit(: A'rkansas Nuclear One-Unit 1 Russellville, Arkansas

5. Identification of Occurrence:

i Diesel Generator #1 inoperable.

6. Conditions Prior to Occurrence

Steady-State Power X R6 actor Power 2568 MWth Hot Standby Net Output 837 MWe Cold Shutdown Percent of Full Power 100  %

N Refueling Shutdown Load Changes During Routine

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Routine Startup Power Operation

Operation Routine Shutdown Operation s.

Other (specify)

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7. Description of Occurrence: -

! At 1615 hours0.0187 days <br />0.449 hours <br />0.00267 weeks <br />6.145075e-4 months <br /> on November 22, 1976, an inadvertant trip of the fire .:

! system deluge while being returned to service rendered Diesel Generator

1. 1 inoperable due to wet control circuitry. .

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8004100 7 02 NSP-III-2, Rev. 5 Attachment "D" 5 October 1',2 1976- Page 2 of 4

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Reportable Occurrence Ps e port No. 50-313/76-33 4

8 Designation of Apparent Cause of Occurrence:

Design Procedure Manufacture Unusual Service Condition Including Environmental Installation /

Construction Component Failure.

(See Failure Data) 5 Operator Other (specify) X An apparent leak off of sealing pressure to deluge valve when system was taken out of service for modifications. -

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9. Analysis of Occurrence:

A surveillance was performed on Diesel Generator #2 which was proven operable, hence no hazard to the health and safety of the public.

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Reportable Occurrence Report No. 50-313/76-33 4

10. Corrective Action:

The Engine Control Cabinet and exciter control cabinet were dried and the generator and cables were meggered for proper readings. A test was performed for proper operation and checked satisfactory. Diesel Generator

1. 1 was ready for service at 1452 hours0.0168 days <br />0.403 hours <br />0.0024 weeks <br />5.52486e-4 months <br /> on November 23, 1976.

Before fire system is to be returned to service the isolation valve to the deluge valve will be shut to ensure sealing pressure and then reopened.

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11. Failure Data:

None.

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L U October 1.-1976 NSP-III-2, Rev. 5 Attachment "D" 5 Page 4 of 4 -

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