The second hydrogen explosion in three days rocked Japan's stricken Fukushima Dai-ichi nuclear plant today, sending a massive column of smolder into the air and wounding 11 employees. Hours later, the U.S. said it had shifted its offshore forces away from the plant after detecting low-level radioactive contagion.
The aircraft carrier USS Ronald Reagan was about 100 miles offshore when it detected the radiation, which U.S. officials said was about the same as one month's usual exposure to natural background emission in the environment. It was not clear if the radiation had leaked during Monday's explosion. That blast was feeling 25 miles away, but the plant's operator said emission levels at the reactor were still within legal limits.
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