According to https://en.m.wikipedia.org/wiki/Nuclear_power_in_Japan , Japan had about 300 TWh of nuclear for a year at the time of the accident. So $180 billion amount to $0.6/kWh over a year if I'm not mistaken. Not cheap. But if you spread over a few decades then that's reasonable.
I must be messing something up, as that’s about 3-4x what I pay for electricity and seems a lot?