Japan’s nuclear policy-setting body has adopted a report saying the country is entering an era of nuclear plant decommissioning, urging operators to plan ahead to lower safety risks and costs requiring decades and billions of dollars.Twenty-seven reactors are so far earmarked or undergoing decommissioning and the decommissioning of nine has been approved by the regulator.The nine are Genkai-1, Hamaoka-1, Hamaoka-2, Ikata-1, Mihama-1, Mihama-2, Shimane-1, Tokai-1 and Tsuruga-1.Among the reactors earmarked for decommissioning are four at the Fukushima Daiichi nuclear station that were severely damaged by the earthquake and tsunami.