ML19319E574
| ML19319E574 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 07/01/1977 |
| From: | Mardis D ARKANSAS POWER & LIGHT CO. |
| To: | |
| Shared Package | |
| ML19319E569 | List: |
| References | |
| NUDOCS 8004110827 | |
| Download: ML19319E574 (4) | |
Text
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L-Reportable Occurrence P.cport No.
50--313/77-13 2.
Report Date: July 1, 1977 3.
Occurrence Date:
June 2, 1977 4
Facility:
Arkansas Nuclear One-llnit 1 Russellville, Arkansas 72801 5.
Identification of Occurrence:
The failure of a Reactor Building cooling fan which is a condition leading to operation in a degraded mode pemitted by a limiting condition for operation (Technical Specification 3.3.4).
6.
Conditions Prior to Occurrence:
, Steady-State Power y
Reactor Power 2568 MWth Hot Standby Net Output 805 MWe Cold Shutdown Percent of Full Power 100 %
Refueling Shutdown load Changes During Routine Power Operation D
Routine Startup Operation Routine Shutdown
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Operation Other (specify) 7.
Description of Occurrence:
At 2159 hours0.025 days <br />0.6 hours <br />0.00357 weeks <br />8.214995e-4 months <br /> on June 2,1977, Feeder Breaker B5-512 opened to Load Center B5, which supplies power to Reactor Building Cooling Fans VSFM-1A 618. An investigation and meggering of both fan motors indicated grounded phase windings in VSFM-1A after which Load Center B5 was re-energized. The tripping of Breaker B5-512 indicated that selective tripping did not occur since Breaker 52-523 (feeder breaker to VSFM-1A) should have tripped.
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Reportabic Occurrence Report No.
50-313/77-13 8.
Designation of Apparent Cause of Occurrence:
Design Proc' dure e
Manufacture Unusual Service Condition Including Environmental Installation /
Construction Component Failure X
(See Failure Data)
Operator Cther (specify)
X The motor bearings had insufficient lubrication.
9.
Analysis of Occurrence:
Since a safety analysis was performed for operation with less than 4 RB cooling fans and the subsequently approved technical specification changes allow 2-cooling units to be operable and powered from independent busses, there was no hazard to the health and safety of the public.
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V Reportable Occurrence Report No. 50-313/77-13 10.
Corrective Action:
The motor was removed and shipped to the vendor. (Reliance Electric
-Company) to be rebuilt. The remaining 3 fan unit's bearings were lubricated and will be placed on a more frequent lubrication schedule.
. The bearings in at least one of the redundant fans will be inspected by the end of the next refueling outage. A breaker test was performed on Breaker 52-523 which indicated that the trip had drifted high. A Preventive Maintenance Program is being established to test all vital 480 volt circuit breakers and calibrate all overcurrent relays.
N 11.
Failure Data:
Fan Motor: VSFM-1A, 480 volt, 125 HP, 1800 RPM, 60 cycle, 3 phase induction motor, fram design 7DB-5003, Reliance Electric Company.
Circuit Breaker: 52-523, 480 volt, 225 AMP ACB, Trip Coil Model OD-5, ITE Manufacturer.
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