You are right that alternative sources of energy require heavy subsidies as well, especially to get them started. However my argument to that is that alternative approaches to energy generation should be explored as the legacy of nuclear power generation so far is a stockpile of highly toxic radioactive waste that will remain so for many, many generations. Wind/solar/tidal power , heck even fossil fuels, do not leave this problem. We can reclaim CO2 and other emissions from power stations if we really have to, and find uses for them, but the only solution for nuclear waste is incredibly expensive storage that no one can guarantee will remain secure for the thousands of years it will take to become safe. (hence my mention of the research into universally understood signage for future generation)