The Japan Atomic Energy Agency announced Saturday it has found that concrete walls in a key building at the defunct Fugen nuclear reactor plant in Fukui Prefecture do not meet design standards at 25 of the 34 locations examined.
"We strictly oversaw the execution of construction and it is difficult to believe such a result came out," an agency official said, adding that the agency will have the strength of the walls checked again.
"The accuracy of the measurements is in question," the official said.