Extract:

On April 25 and 26, 1986, the worst nuclear accident in history unfolded in what is now northern Ukraine as a reactor at a nuclear power plant exploded and burned. Shrouded in secrecy, the incident was a watershed moment in both the Cold War and the history of nuclear power. More than 30 years on, scientists estimate the zone around the former plant will not be habitable for up to 20,000 years.

https://www.nationalgeographic.com/culture/article/chernobyl-disaster

And then March 2011, when around 18,000 people died as a result of the Fukushima Daiichi Power Plant disaster after it was hit by an offshore earthquake and tsunami.

https://www.history.com/this-day-in-history/fukushima-nuclear-disaster-japan

One might question whether an earthquake region should have ever considered nuclear power and, due to sea levels rising, should even any new Reactor be built by any seashore?

https://ensia.com/features/coastal-nuclear/

And a 2014 article is an example of post Fukushima thinking on the subject.

https://iopscience.iop.org/article/10.1088/0952-4746/34/2/R1

All plants being decommissioned in the UK are on the coast, with coastal erosion common nowadays too.

Scotland has been decommissioning several plants and learning the skills needed to carry it out since Dounreay, built in 1955 as a fast breeder reactor.

Dounreay is again at the forefront of science and engineering – this time in the skills and innovation needed to dismantle one of the most complex and hazardous legacies of the 20th century. Dounreay today is a site of major construction, demolition and waste management. The experimental facilities are being cleaned out and knocked down, and the environment is being made safe for future generations.

https://www.gov.uk/government/publications/dounreay-2023/dounreay-2023

In 1977 there was an explosion in the waste disposal unit. Radioactive materials on the beach in 1983 were identified. 1994 the reactor is shut down.

And still the decommissioning goes on to the present day.