ML19344F584
| ML19344F584 | |
| Person / Time | |
|---|---|
| Site: | Trojan File:Portland General Electric icon.png |
| Issue date: | 08/28/1980 |
| From: | PORTLAND GENERAL ELECTRIC CO. |
| To: | |
| Shared Package | |
| ML19344F582 | List: |
| References | |
| NUDOCS 8009150475 | |
| Download: ML19344F584 (1) | |
Text
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i SPECIAL REPORT 1.
Report No.:
N/A 2.
a._
Report Date:
August 28, 1980 b.
Occurrence Date: July-21, 1980 3.
Facility: - Trojan Nuclear Plant, PO Box 439, Rainier, Oregon 97048
' +.
Identification of Occurrence:
One seismic sensor, ST 6336 in the Cable Spreading Room, was inoperable for a period greater than thirty days.
5.
Conditions Prior to Occurrence:
The plant was in Mode 1, power operation, at the time of the occurrence.
6.
Description of Occurrence:
During monthly functional testing, seismic monitoring sensor ST 6336 -
Cable Spreading Room, did not respond acceptably.
7.
Designation of Apparent Cause of Occurrence:
The cause of this failure was equipment malfunction. The seismic triaxial accelerometer ST 6336 in the Cable Spreading Room failed to functionally test.
8.
Analysis of Occurrence:
This event had no effect on plant or public safety. During this. period, all other triaxial accelerographs were operable.
9.
Corrective Action:
The immediate corrective action was to attempt a repair of the instrument.
When the onsite repair.was not satisfactory, appropriate spares were obtained.
The channel was repaired and returned to service August 26, 1980, five days past the 30-day period. The permanent corrective action is to maintain sufficient spare parts onsite.
800g15g