ML19329B904

RO NP-33-77-12:on 770613,wind Speed Indicator at Elevation 827 Ft Above Sea Level Found Not Indicating Properly During Routine Meteorlogical Monitor Insp.Caused by Defective Bearings in Wind Speed Transmitter.Transmitter Replaced

ML19329B904
Person / Time
Site:	Davis Besse
Issue date:	07/07/1977
From:	Batch S, Lingenfelter J TOLEDO EDISON CO.
To:
Shared Package
ML19329B837	List: ML19329B836 ML19329B904
References
NUDOCS 8002060897
Download: ML19329B904 (2)

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/ DAVIS-BESSE UNIT ONE NUCLEAR POWER STATION SUPPLEMENTAL INFORMATION FOR LER NP-33-77-12 DATE OF EVENT: June 13, 1977 FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: The wind speed indicator at Elevation 827 feet above sea level was not indicating properly.

Conditions Prior to Occurrence: The plant was in Mode 5. Power: (MWE) 0, (MWT) 0 Description of Occurrence: At approximately 0930 hours0.0108 days <br />0.258 hours <br />0.00154 weeks <br />3.53865e-4 months <br /> on June 13, 1977 during weekly inspection of the Meteorological Monitoring System by station personnel ~,

it was discovered that the wind speed indiencor at 827 feet above sea level was not indicating properly. NUS, the firm responsible for maintenance on the tower, l was notified as to the nature of the occurrence. j Designation of Aeparent Cause of Occurrence: NUS found the bearings in the wind l

) speed indicator to be defective and replaced the entire unit with one that had  !

been previously tested and calibrated. The unit was replaced by 1400 hours0.0162 days <br />0.389 hours <br />0.00231 weeks <br />5.327e-4 months <br /> on l June 14, 1977, which restored proper indication and removed the station from the Action Statement of Technical Specification 3.3.3.4.

Analysis of occurrence: Since there was no radioactive release requiring meteoro-  ;

logical monitoring during the period that the unit was inoperable, no danger to the health and safety of the public or static.' personnel occurred.

l Corrective Action: The entire wind speed transmitter was replaced with a cali-brated and tested unit by NUS. This transmitter has been and will continue to be replaced by NUS on a regular basis at three month intervals. This incident is considered unique and would not usually occur because of the preventative main-tenance by NUS.

Failure Data: No previous similar events have occurred.

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