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RO:on 890915 & 18,reactor trips occurred when safety Channel 1 high voltage power supply dropped to 90% or less of rated voltage.Caused by instabilities in 15-volt dc power supply. Trip relays replaced & bistable adjusted.

Accession Number: ML20248F110

Date Released: Friday, September 18, 2020

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• ML20248F108 - RO:on 890915 & 18,reactor trips occurred when safety Channel 1 high voltage power supply dropped to 90% or less of rated voltage.Caused by instabilities in 15-volt dc power supply. Trip relays replaced & bistable adjusted. (5 page(s), 9/29/1989)
• ML20248F111 - Advises that 890915 safety Channel 1 high voltage trip not violation of Tech Specs but in view of recent equipment problems,recommends NRC be notified for info purposes.Trip will be examined at 890919 safety review meeting. (1 page(s), 9/15/1989)