Size of nuclear reactors

I was able to find this:

It gives the sizes of various reactors. Here is one:

The KLT-40S is a four-loop version of the icebreaker reactor for floating nuclear power plants which runs on low-enriched uranium (<20%) and has a bigger core (1.3 m high instead of 1.0 m) and shorter refueling interval: 3 to 4.5 years. A variant of this is the KLT-20, specifically designed for FNPP. It is a 2-loop version with same enrichment but 10-year refueling interval.