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More than 1000 contaminated water tanks at Fukushima Daiichi, some do not have fondation bolts.

Even with a moderate earthquake of seismic intensity 4 there is a risk that those contaminated water tanks collapse.

The Nuclear Regulatory Commission of Japan has published on their website the seismic statement submitted by TEPCO about those tanks without fondation bolts. Their quake-resistance standard is 0.3G lower.

http://www.nsr.go.jp/data/000107385.pdf

The photograph below clearly shows the tank without fondation bolts.

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Seismic intensity 4 and typhoons could cause the collapse of those contaminated water tanks. In case of tanks collapsing, a large amount of contaminated water would of course flow into the Pacific Ocean.