ML19320A175

RO 50-313/76-18:on 760716,hydrogen Purge Inlet Fan,Filter Bleed Valve & Penetration Room Ventilation Sys Fan Breakers Tripped.Caused by Abnormally Hot Environ & Low Thermal Overload Setting.Overload Setting Increased & Dampers Reset

ML19320A175
Person / Time
Site:	Arkansas Nuclear
Issue date:	08/03/1976
From:	Mardis D ARKANSAS POWER & LIGHT CO.
To:
Shared Package
ML19320A166	List: ML19320A165 ML19320A168 ML19320A169 ML19320A175
References
NUDOCS 8004210480
Download: ML19320A175 (4)

Text

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1. ACuTY METHOD OP STAruS  % POWER OTHE9 STATUS DISCOVERY DISCOVERY DESCRpTON 1 [gj lol9191 1 ,ya i I sl I a4 I 7 8 9 10 12 13 44 45 48 80 ACTMTV CONTENT RELEASE 0 OF RELEASE AMOUNT OF ACTMTt LOCATON OF RELEASE 7 8 12d 9

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PERSONNEL EXPOSURES NUMBER TYPE C,ESCRWTON DE ICICici lz] I NA I 7 89 11 12 13 80 PERSONNEL INJURIES O NUMBER DESCRWTON E Iololol l 7 89 11 12 we ,

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7 89 10 80 PU8UCITY 1 l nA l 89 80 ADDITIONAL FACTORS 9 80

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1. Reportable Occurrence Report No. 50-313/76-18 j

2. Report Date: 8/3/76 .; . Occurrence Date: 7/16/76

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

5. Identification of Occurrence:

Breaker trip on H2 Purge and penetration room H6V system.

6. Conditions Prior to Occurrence:

Steady-State Power X Reactor Power 2542 MWth llot Standby Net Output 808 MWe i

Cold Shutdown Percent of Full Power 99 %

Refueling Shutdown Load Changes During Routine Power Operation i \ Routine Startup -

i .j Operation Routine Shutdown l Operation l

Other (specify) t

7. Description of Occurrenec:

On July 16,1976 at 0632 hours0.00731 days <br />0.176 hours <br />0.00104 weeks <br />2.40476e-4 months <br />, while running surveillance test on H2 Purge lead system, VSF-30A (H2 Purge inlet fan) tripped and would not restart.

Fan had been running. for 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />.

l e On July 20, 1976 0 0150 hours0.00174 days <br />0.0417 hours <br />2.480159e-4 weeks <br />5.7075e-5 months <br />, while running surveillance test on penetration room ventilation lead system, VEF38A (Penetration room ventilation system l fan) and CV2136 (Filter bleed valve) breakers tripped.

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Attachuent "C"

' NSP-10 Rev. 4 Page 2 of 4

- !! arch 23,1976 )

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I:eportable Occurrence 1:cport No. 50-313/76-18 I

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.g 8. Designation of Apparent Cause of Occurrence:

lj Design Procedure Manufacture Unusual Service Condition

, . Including Environmental Installation /

Construction Component Failure

• Operator Other (specify) X ..

Thermal overload set too low and breaker in abnormally hot environment.

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9. Analysis of Occurrenec:

Standby system was proven operable. Either system will fulfill design requirements; therefore, the failure did not present a hazard to the health and safety of the public.

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.\t t achment "r" htt rch 23, 1976 tiSP-lu Hov. 4 Page 3Of4

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Reportable Occurrence Report iio. 50-313/76-18 l

10. Corrective Action:

4 Thermal overload setting was increased and ventilation dampers were adjusted to decrease room temperature.

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11. Failure Data:

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/it taclunent "C" March 23, -1976 NSP-It), Rev. 4 l' age 4 of ' 4

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