I'm all for investment in nuclear but it would take a really bloody colossal nature preserve. The Chernobyl exclusion zone is only 2,600 km^2 but about 3,900,000 km^2 of Europe - about 40% of it's total land mass - was contaminated with caesium-137 after that disaster and about 2% of Europe was contaminated to 'high' levels. Even as far away as the UK there are restrictions on hundreds of farms related to that radiation.

Source: http://www.chernobylreport.org/?p=summary