ML19331E233
| ML19331E233 | |
| Person / Time | |
|---|---|
| Site: | Trojan File:Portland General Electric icon.png |
| Issue date: | 08/28/1980 |
| From: | Yundt C PORTLAND GENERAL ELECTRIC CO. |
| To: | |
| References | |
| CPY-830-80, NUDOCS 8009090410 | |
| Download: ML19331E233 (2) | |
Text
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Por:!and General Elcctric Company
. Trojan Nuclear Plant P.O. Box 439 3
Rainier, Oregon 97048 (503)356-3713 August 28, 1980 CPY-830-80 fo-s4Y Mr. R. R. Engelken, Director Nuclear Regulatory Coc:21ssion, Region V 1990 North California 31vd.
Walnut Creek, CA' 94596
Dear Sir:
In accordance with the Trojan Plant Operating License, Appendix A, US NRC Technical Specifications, Paragraphs 3.3.3.3.b and 6.9.2, attached is a report concerning a situation where a seismic nonitoring instrunent was inoperable for a period exceeding thirty days.
l Sincerely, C.
. Yundt General Manager CPY/DL3:na Attachnent-c:
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'SPECIAL REPORT
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-1. l Report No.:-
I N/A 12.1 la.'
-Report.Date:
. August 28, 1980 g
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-0ccurrence Date:-l July 21, 1980 j
3..: Facility:, Trojan Nuclear Plant, PO Box 439, Rainier, Oregon 97048
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Identification of 0ccurrence:
I One seismic sensor, ST 6336 in the Cable. Spreading Room, was inoperable for:a period greater than thirty days.
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Conditions Prior to occurrence:
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The plant was in Mode 1, power operation, at the time of the occurrence.
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Descriotion of Occurrence:
During monthly functional testing, seismic monitoring sensor ST 6336 -
Cable Spreading Room, did not respond acceptably.
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Designation of' Apparent Cause of Occurrence:
The cause'of this failure.was equipnent malfunction. The seismic triaxial accelereceter ST 6336 in the Cable Spreading Room failed to functionally test.
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Analysis of Occurrence:
This event had no effact on plant ee public safety. During this period, all other triaxial accelerographs were operable.
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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, '.980,
.five days ~past the 30-day. period. The pernanent corrective action is to
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maintain. sufficient spare parts onsite.
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