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I think it's a graphical representation of the RBMK control rods [1].

It's also in the last two images. These are replaceable control rods that were laid out in a circular pattern in the RBMK class reactors.

1: https://en.wikipedia.org/wiki/RBMK

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It's not nearly enough rods for an RBMK. Those were huge. And they had nothing outside the circle. Probably another type of nuclear facility. Maybe a medical isotope reactor?

The second last photo looks like an RBMK or at least something that size.

If you click on the picture it says it's the Kola nuclear power plant, which is a VVER-440 reactor. Searching for other VVER pictures, e.g.[1], confirms that they match.

[1] http://www.nucleartourist.com/areas/vver440a.htm

They had channel-type reactors before the RBMK (essentially earlier generations of the design) that were smaller. Could be what these are.

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