ML19329B904
| ML19329B904 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 07/07/1977 |
| From: | Batch S, Lingenfelter J TOLEDO EDISON CO. |
| To: | |
| Shared Package | |
| ML19329B837 | List: |
| References | |
| NUDOCS 8002060897 | |
| Download: ML19329B904 (2) | |
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g g During a routinc inspection and servicing of the Meteorologicdl Monitoring i as y
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lie]l, above ses level was not indicating procarly.
This placed us into an l
@ l Action Statement in Technical Specificatien 3.3.3.4.
(NP-33-77-12)
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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
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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 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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