ML19319B790
| ML19319B790 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 09/19/1977 |
| From: | Lingenfelter J, Vallade S TOLEDO EDISON CO. |
| To: | |
| Shared Package | |
| ML19319B717 | List: |
| References | |
| NUDOCS 8001270258 | |
| Download: ML19319B790 (2) | |
Text
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DAVIS-BESSE UNIT ONE NUCLEAR POWER STATION SUPPLEMENTAL INFORMATION FOR LER NP-33-77-66 DATE OF EVENT: August 24, 1977 FACILITY: Davis-Besse Unit 1 I
IDENTIFICATION OF OCCURRENCE: Decay Heat Pump 1-2 was made inoperable to install union in cooling water line.
Conditions Prior to Occurrence: The plant was in Mode 2, with Power (MWT) = 0 and Load OL'E) = 0.
Description of Occurrence: On August 24, 1977 at 0915 hours0.0106 days <br />0.254 hours <br />0.00151 weeks <br />3.481575e-4 months <br />, Decay Heat Pu=p 1-2 was taken out of service to install a union on the Component Cooling Water Return line. This placed the Station in Action State =ent (a) of Technical Specification 3.5.2 since one of the two Decay Heat Pu-ps required in Mode 2, startup, was removed from service.
Designation of Apparent Cause of Occurrence: This was a planned =aintenance activity. There was a loose piping connection on the inboard side of the Component Cooling Water Return line for Decay Heat Pump 1-2.
union was a
installed in the line to allow tightening without re= oval of previously installed seismic supports.
Analysis of Occurrence: There was no danger to the health and safety of the public or Station personnel. Decsy Heat Pump 1-1 was still available to operate in the event of an accident.
Corrective Action: The union was installed, completing the scheduled =aintenance.
Decay Heat Pump 1-2 was returned to service at 1515 hours0.0175 days <br />0.421 hours <br />0.0025 weeks <br />5.764575e-4 months <br /> on August 24, 1977, removing the Station from Action Statement (a) of Technical Specification 3.5.2.
Failure Data: There have been no previous occurrences involving Decay Heat Pump 1-2 for planned maintenance.
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