ML19309D894
| ML19309D894 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 07/08/1977 |
| From: | Mardis D ARKANSAS POWER & LIGHT CO. |
| To: | |
| Shared Package | |
| ML19309D889 | List: |
| References | |
| NUDOCS 8004110728 | |
| Download: ML19309D894 (4) | |
Text
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Reportable Occurrence Report No. S0-313/77-14 2.
Report Date: July 8, 1977 3.
Occurrence Date:
June 12,1977 4
Facility:
Arkansas Nuclear One-Unit 1 P. O. Box 608 Russellville, AR 72801 S.
Identification of Occurrence:
Standby. circuit of the. Penetration Room Ventilation System was found to be inoperative.
6.
Conditions-Prior to Occurrence:
Steady-State Power X
Reactor Power 2542 MWth Hot Standby Net Output 797 MWe Cold Shutdown Percent of Full Power 99 %
Refueling Shutdown Load Changes During Routine O
Power Operation Routine Startup
~
Operation Routine Shutdown Operation Other (specify)
/
i 7.
Description of Occurrence:
At approximately 0232 hours0.00269 days <br />0.0644 hours <br />3.835979e-4 weeks <br />8.8276e-5 months <br /> on June 12, 1977, while performing a surveillance test on the Penetration Room Ventilation System, Circuit Breakers S2-6313 and S2-6314 tripped. These two breakers are for Valve CV-2133 (Standby System Filter Discharge) and Valve CV-2126 (Lead System Filter bype,s).
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D Reportable Occurrence Report No.
S0-313/77-14 8.
Designation of Apparent Cause of Occurrence:
Design Procedure Manufacture Unusual Service Condition x
Including Environmental Installation /
Construction Component Failure (See Failure Data)
Operator 1
Other (specify)
The themal overload settings on the circuit breakers were set too
. low for the abnomally hot environment.
9.
Analysis of Occurrence:
Since both circuits were proven operable during the last surveillance test and the lead circuit wcs proven operable on June 12, 1977, there was no hazard to the health and safety of the public.
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Reportable Occurrence Report No.
50-313/77-14
- 10. Corrective Action:
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' The themal overload setting was increased in both of the circuit breakers and the surveillance test was reperformed. The circuit proved to be operable.
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Failure Data:
i A similar occurrence was reported in ROR 76-18 and ROR 77-9 i
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