A 400-kilogram machine part fell into a nuclear fuel pool at Japan’s crippled Fukushima plant Friday, the operator said.
Tokyo Electric Power Co (TEPCO), said it had not detected any significant changes in radiation readings or in the level of pool water at the No. 3 reactor.
A massive earthquake and tsunami in March 2011 ravaged Japan’s northeastern coast and wrecked the plant, sparking meltdowns at three of its six reactors.
Friday’s incident occurred shortly after noon during a remotely controlled operation to remove debris from the fuel pool at the unit where the broken reactor still lies untouched. The pool contains 566 fuel rods, most of which are spent.