What are the consequences of nuclear accident in japan?

There are going to be some economic losses as Japan struggles to control and contain the accident, and as they seek new sources of power to replace that which was lost.

The radiological consequences are probably not going to be that bad, due to the massive dilution effects of the atmosphere and ocean, but we don't know yet, because the levels are still too low to know anything with absolute certainty.

The biggest consequence is that this is going to impact world wide opinion about the safety of nuclear power, right at a critical time when nuclear power is what we need to move forward. We are just now getting over the negativity of Three Mile Island and Chernobyl, and now this unfortunate accident at Fukushima Daiichi happens. It is probably going to set us back 20 years, and we can't really afford that right now.

Yes, we do need to understand what happened, so that we can protect ourselves going forward. What we also do need, however, is sanity. There is far too much misinformation and misunderstanding about the real issues involved on the global scale.