I can see some good reasons for siting data centers near nuclear power stations.
1) Data center power consumption is pretty constant, and nuclear power is well suited to constant loads. You can't just start and stop a reactor.
2) Nuclear plants are situated where there is abundant cooling water, that's good for data centers too
3) Nobody wants to live or work near a nuclear plant, that means lower land costs for building the data center and fewer nimbys.
4) Less cost installing high power feeder lines, and lower transmisson losses.
5) If there is a Chernobyl event and if we lose a few hardware engineers, they're ten a penny these days.
On a slightly more serious note, data centers will generally get better prices for their electricity for many reasons. Firstly, they are a customer who doesn't experience big swings during the day/night cycle (known as base load customers). Secondly, they generally have a power factor close to 1 so they need less infrastructure. Thirdly, they can afford to take on long term supply contracts, which usually mean lower prices. Finally, data centers usually need two independent supplies from different grid access points. This allows them to play one supplier off against another to keep prices down.
Whether this is good or bad for the municipal consumers depends on supply and demand. If the power supply in your area is already maxed out in the summer and someone builds a 50,000 square foot co-lo site on the other side of the interstate, prices are going to go up. That's just basic economics.