TOKYO – Nuclear fuel rods at a quake-stricken Japanese nuclear reactor are now fully exposed, Jiji news agency said, quoting the plant’s operator, Tokyo Eletcric Power Co. The report referred to the Fukushima Daiichi complex’s No.2 reactor, where levels of water coolant around the reactor core had been reported as falling earlier in the day. The Jiji report said a meltdown of the fuel rods could not be ruled out. A meltdown raises the risk of damage to the reactor vessel and a possible radioactive leak, experts say.