risk includes possible loss of principal. a miletone in the cleanup of the fukushima nuclear pow are plant in japan. cnn s paula hancock s got rare access to the facility. reporter: you can t get much closer to the hearts of the fukushima disaster than this. this is why tepco has brought us here. we are in the reactor 4 billing, that suffered the hike roe gen blast. and this is the cooling pool. inside there are 1500 spent fuel rods. what the company is doing over the coming days is to remove them to a more stable location. they say. they insist it is a routine operation, they ve done it many times before. nuclear power, the science and the myths, the focus of a document tear pandora s promise airs tonight 9:00 p.m.