In actual fact, there can be far more radiation released by a conventional ( oil/coal) plant, as that is totally unregulated- even though there are significant impurities in the fuel. Given the amount of coal being burnt, even a low level of radiation adds up to greater than the nuclear plant will release ( when both plants are in normal operation.) The waste problem at end of lfe is the major problem, as nuclear is far cleaner in most aspects during operation.