nuclear-news

Hazardous Problem of ABB breakers as described and illustrated by the utility, Dominion Nuclear Connecticut to the US NRC on March 13, 2015: “DOMINION NUCLEAR CONNECTICUT. INC. MILLSTONE POWER STATION UNIT 3 10 CFR PART 21 REPORT OF BINDING IN ABB K-L CLOSE LATCHES (PART NUMBER 716610K01)”

Click to access ML15079A398.pdf

[Note what looks like green patina on the defective one: https://en.wikipedia.org/wiki/Patina
The material doesn’t appear appropriate for something so important as a nuclear power station. It’s apparently supposed to be new, or almost new. So, why does it have the green patina? ]

Swedish Swiss ABB clearly has dangerous issues with quality assessment-quality control, at least as recently as last year.

From the Dominion Report:
“For this type of breaker, after opening, the closing spring charging motor runs to charge the closing springs and configure the breaker for the next closing demand. With a stuck…