ML19329B929
| ML19329B929 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 07/28/1977 |
| From: | Batch S, Lingenfelter T TOLEDO EDISON CO. |
| To: | |
| Shared Package | |
| ML19329B926 | List: |
| References | |
| LER-RO-770728-01, LER-RO-770728-1, NUDOCS 8002060914 | |
| Download: ML19329B929 (2) | |
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@ l Containment Air Lock outer door would not latch to close.
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.2 CAust OESCRIPitoN oel Defective fabrication was responsible for the door's failure to close.
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TOLEDO EDISON COMPANY DAVIS-BESSE UNIT ONE NUCLEAR POWER STATION i
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SUPPLEMENTAL INFORMATION FOR LER NP-33-77-18 i
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i DATE OF EVENT: July 3, 1977 FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: Failure of Containment Personnel Airlock outer door to latch.
Conditions Prior to Occurrence: The plant was in Mode 4 (Hot Shutdown) with Power (MWT) = 0 and Load (MWE) = 0.
Description of Occurrence: At 2300 hours0.0266 days <br />0.639 hours <br />0.0038 weeks <br />8.7515e-4 months <br /> on July 3, 1977, personnel inside Con-tainment attempted to enter the personnel airlock.
The inner door was closed, but the outer door would not latch and was not completely closed. The station was thus placed in the Action Statement of Technical Specification 3.6.1.3.
Usage of the personnel air lock was immediately ceased, and admittance to and exit from Containment was via the emergency hatch only until both doors were demonstrated to be operable.
Designation of Apparent Cause of Occurrence: The cause of the event is attributed
[ ~s) to fabrication error by the airlock door manufacturer, Chicago Bridge and Iron
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Company. A pin in the locking plate assembly was not welded properly.
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subsequently rewelded by station maintenance personnel.
Analysis of Occurrence: No danger to the health and safety of the public occurred since integrity of Containment was maintained and no radioactivity was released.
Corrective Action: The pin was rewelded and the airlock declared operable after passing the required Surveillance Test (ST 5061.05) at 1530 hours0.0177 days <br />0.425 hours <br />0.00253 weeks <br />5.82165e-4 months <br /> on July 5, 1977.
This removed the station from the Action Statement of Technical Specification 3.6.1.3.
Recurrence of a failure of the pin in the locking plate assembly is not expected since the pin is now properly velded.
Failure Data: No previous similar events have occurred.
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