Reactor designs like the gas-cooled (using helium) pebble-bed reactors are very safe and should be cheap to operate too.
Terrorist attacks cant do that much against them as you will never have a "China syndrome" nor will it have any radioactive leaks from cooling leaks. The pebbles are incased in silicium carbide so can take a lot of punishment.
http://gt-mhr.ga.com/
Info about other advanced reactor designs :http://www.uic.com.au/nip16.htm
CBR
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