ML19320A175
| ML19320A175 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 08/03/1976 |
| From: | Mardis D ARKANSAS POWER & LIGHT CO. |
| To: | |
| Shared Package | |
| ML19320A166 | List: |
| References | |
| NUDOCS 8004210480 | |
| Download: ML19320A175 (4) | |
Text
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Reportable Occurrence Report No.
50-313/76-18 j
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Report Date: 8/3/76
.;. Occurrence Date:
7/16/76 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
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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 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 e
l room ventilation lead system, VEF38A (Penetration room ventilation system fan) and CV2136 (Filter bleed valve) breakers tripped.
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Attachuent "C"
- !! arch 23,1976 NSP-10 Rev. 4 Page 2 of 4
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I:eportable Occurrence 1:cport No.
50-313/76-18 I
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Designation of Apparent Cause of Occurrence:
.g 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.
i 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 10.
Corrective Action:
4 Thermal overload setting was increased and ventilation dampers were adjusted to decrease room temperature.
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Failure Data:
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