CNN | One day after black smoke prompted an evacuation, workers returned Thursday to the Fukushima Daiichi nuclear plant -- employing myriad methods to try to prevent more radiation from seeping into the atmosphere.
After several days of setbacks and billowing smoke, authorities Thursday addressed issues at each of the facility's six reactors.
"We are working to resume (operations)," Japanese Chief Cabinet Secretary Yukio Edano said. "We cannot be too optimistic, and we are still taking cautious measures."
Japan Atomic Industrial Forum, an industry trade group, reported Thursday that -- despite previous fears to the contrary -- the No. 3 reactor's containment vessel was "not damaged."