Summary Box: Japan nuclear crisis

AP News
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Posted: Mar 17, 2011 3:42 AM

WATER DUMP: Emergency workers resort to extraordinary, combat-like measures in desperate attempts to cool radioactive fuel at the Fukushima Dai-ichi complex north of Tokyo. They deploy an army helicopter to dump water from the sky on one out-of-control reactor where power was knocked out Friday by an earthquake-born tsunami.

WATER CANNONS: At the same reactor, workers use water cannons to blast cooling water into a pool used to store spent nuclear fuel, which can also overheat and catch fire.

RESTORING POWER: In one encouraging development, crews were finishing laying a new cable to supply more reliable electricity for motors, valves and pumps needed to keep reactors cool.