Nuclear fuel rods are seen in a water pool inside the nuclear power plant Muehleberg during a yearly revision, in Muehleberg August 16, 2012. Since the commission of Muehleberg nuclear power station in 1972, the owners BKW FMB Energie, conducts an annual review of the plant, with more than 600 additional personnel brought from around the world to help with the assessment. This year some 32 fuel rods out of 240 were replaced. Picture taken August 16, 2012. REUTERS/Ruben Sprich (SWITZERLAND - Tags: SCIENCE TECHNOLOGY ENERGY)