nothing one talk about 100% of offshore energy In the coming years. Korea now has just 0.53% of wind electricity. Even If it will be 30-40, country won't be need even new fossil PP.

Korea is increasing both wind and nuclear. Using old fossil plants when wind is out is not ideal from environment perspective. Also, the infrastructure and supply chains must be maintain.

Korea is currently gaining experience decommissioning, they were a little late into the nuclear game, by the time any new nuclear is decommissioned, they will be experts and have all the facilities needed.

Before these regulations were Chernobyl and Fukushima. And LCOE as 130 USD/MWh, it also twice bigger than in New offshore wind.

No one has died from Fukushima radiation and it has been over blown by neighboring countries that simply hate Japan. Also nearly all of the damage was from the earthquake and tsunami (anti nuclear is still showing misleading pictures of flattened neighborhoods). Chernobyl was much worse, but definitely won't happen again. People hate the USSR, especially Ukraine. Lots of disinformation in both cases.

LCOE of offshore wind usually does not inclue the need for maintaining and building grid back ups. Throw that in and it is far less attractive. Nuclear, on the other hand, almost never have unscheduled outages and when it is out neighboring reactors can produce more electricity and less pressured steam or heat.

Another point is wind (and solar) plants simply do not produce pressured steam and heat, limiting other applications. Korea has cold winders and a massive industry that consumes lots of heat and steam.