Sorry, forgot to add:
So from the use of a unit of acceleration, what they’re talking about is the vertical design parameters for acceleration of the plant (or some aspect of the plant) in an upward direction. The plant will have design parameters for acceleration in horizontal and vertical directions that the structure(s) are supposed to withstand without breaking or failing.
What this amounts to is that the quakes they’re experiencing are exceeding the design parameters of their nuclear plants. This is sort of an obvious factoid by now, but the addition of numbers and units is interesting.
OK I posted my last at the same time you posted your last. Thanks for the info.