ML19329B918
| ML19329B918 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 06/29/1977 |
| From: | Batch S, Lingenfelter J TOLEDO EDISON CO. |
| To: | |
| Shared Package | |
| ML19329B913 | List: |
| References | |
| NUDOCS 8002060907 | |
| Download: ML19329B918 (2) | |
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tvt4f of SCmiritone gg At approximately 1530 hours0.0177 days <br />0.425 hours <br />0.00253 weeks <br />5.82165e-4 months <br /> on June 7, 1977, during Surveillahce Tes't g
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TOLEDO EDISON COMPANY DAVIS-BESSE UNIT ONE NUCLEAR POWER STATION SUPPLEMENTAL INFORMATION FOR LER NP-33-77-13 l
y DATE OF EVENT:* June 7, 1977 FACILITY: Davis-Besse Unit 1
. _..__ IDENTIFICATION OF OCCURRENCE: Seismic trigger, which is required to actuate the Seismic Monitoring Systes, was not operating properly.
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Conditions Prior to Occurrence: The station was in Mode 5 with Power (MWE)-0, j
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Description of Occurrence: At approximately 1530 hours0.0177 days <br />0.425 hours <br />0.00253 weeks <br />5.82165e-4 months <br /> on June 7, 1977, during i
Surveillance Test, ST 5034.01, it was found that the seismic trigger was not operating properly. The seismic trigger.vas firing spuriously.
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Desianation of Apparent cause of Occurrence: The station Instrument and Control l
l (I&C) Lab did not determine the cause of this defective behavior. The trigger
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is being returned to the manufacturer for analysis. The unit was replaced with a non-defective seismic trigger on June 25, 1977, which removed the station from the Action Statement of Technical Specification 3.3.3.3.
Analysis of Occurrence: Since there was no seismic event requiring seismic moni-r toring during the period that the unit was not operating properly, no damage to the health and safety of the public or station personnel occurred.
Corrective Action: The seismic trigger was replaced with a non-defective unit by i
station personnel.
l Failure Data: No previous similar events have occurred.
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