There have been other leaks (check Japan). The effects of Chernobyl were extreme and are still persistent today. You cannot rule out another leakage, especially if you factor in deliberate attempts to cause a leakage for whatever reason (disgruntled employee, sabotage, terrorism etc.) Countries can only be considered to be disarming if you're looking at America/Russia. India and Pakistan, North Korea, god knows how many other countries are arming up. I would say that the odds favour of at least one of these countries experimenting with reactors. Wether nuclear power is safe or not is debatable but the bad press has lead to the scaling down of the construction of nuclear powerplants. I do not see the trend reversing without a major campaign, definately not in the next few years which means that nuclear power will probably not become the dominant source in the US/Canada.