IT IS NOT CLEAN!
Do you know about the RADIOACTIVE waste they put out?
Most of the radioactive isotopes in the waste emit large amounts of radiation and have extremely long half-lives (some longer than 100,000 years) creating long time periods before the waste will settle to safe levels of radioactivity.
A half-life is how long it takes for that radiation to disipate by half its original amt.
so if its low, around 50,000 years half life, it will be radioactive for around 1/2 a million years.
Few debates on nuclear power or nuclear weapons discuss the problems of waste disposal should the power plant or missile be decommissioned. Few debates on nuclear waste disposal discuss the amt of $$$$$$$$$$$$ it cost to store nuclear waste. And you will store it FOREVER!
So how much would it cost to store 1 million tons of RADIOACTIVE waste for 1/2 a million years?
i guess this is a 2 parter!
the waste products are expected to be immobilized for a very long period of time (many thousands of years).
http://en.wikipedia.org/wiki/Nuclear_waste