[wolfpat]

It’s not that big of a deal. This earthquake was way below the limit for what these plants were designed to withstand without damage.

They’ll send a bunch of “Scratch Plates” off to an engineering company to be evaluated for the exact intensity of this quake. That’ll determine if they can start back up. These scratch plates are tuned to different frequencies and set to vibrate each of the three orthogonal planes. They’ll show how strong the vibrations were at what frequency and in what direction.

[mad_as_he$$]

I understand. I lived in Kalifornia for many years. Saw the aftermath of all the big quakes. I have seen a great deal of damage from relatively small quakes that had more side to side motion than was anticipated. The scale measures energy released but the vertical and horizontal movement can be very different in the resulting damage. I was in a Semiconductor facility during one quake in Livermore and watched a 30,000 pound machine break all of it's anchors and literally hop across the floor. It's sister machine than was 180 degrees out the other direction never even moved or stressed than anchors.

The natural frequency components of various structures is very interesting

[justa-hairyape]

This earthquake was way below the limit for what these plants were designed to withstand without damage.

Not what I have read. The quake was right at the maximum this plant was designed for. Plant was designed for 5.9 to 6.2. This was the strongest quake recorded in that area during the modern nuclear power plant era. So there must be at least some damage. Dominion itself states that these plants are built to the local requirements. And they have plants scattered around the east and mid-west.