Japan says it will soon require atomic reactors to be shut down after 40 years of use to improve safety following the nuclear crisis set off by last years tsunami.
Concern about aging reactors has been growing because the three units at the Fukushima Daiichi plant in northeastern Japan that went into meltdown following the tsunami in March were built starting in 1967. Among other reactors at least 40 years old are those at the Tsuruga and Mihama plants in central Japan, which were built starting in 1970.
Many more of the 54 reactors in Japan will reach the 40-year mark in the near future, though some were built only a few years ago.
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