30kg of lead shield broke the joint of the pipes

Following up this article ..Another leakage at reactor 4. 100 microSv/h on surface

1/22/2012, Tepco announced it was because of the lead shield covered on the joint.
The joint part to leak contaminated water was covered with lead, Tepco explains the shield was too heavy.
However it weighs only 30kg actually.

Source

汚染水漏れは鉛重みで配管にずれ 福島第1原発

東京電力は22日、福島第1原発の汚染水を移送する配管から低濃度の汚染水が漏れたのは、放射線を遮るために載せた鉛の重みにより配管がずれたことが原因とみられると発表した。

東電によると、鉛の遮蔽材は重さ30キロで、配管の継ぎ目の上に設置していたが、重みで継ぎ目に隙間ができたらしい。東電は鉛を取り除き、汚染水を移送する際には、周辺に作業員が近づかないよう指示を徹底するとしている。

漏れたのは、2号機タービン建屋にたまった汚染水を移送する配管で、表面線量が毎時0・1ミリシーベルトと比較的低かった。

2012/01/22 20:31 【共同通信】

About this site

This website updates the latest news about the Fukushima nuclear plant and also archives the past news from 2011. Because it's always updated and added live, articles, categories and the tags are not necessarily fitted in the latest format.
I am the writer of this website. About page remains in 2014. This is because my memory about 311 was clearer than now, 2023, and I think it can have a historical value. Now I'm living in Romania with 3 cats as an independent data scientist.
Actually, nothing has progressed in the plant since 2011. We still don't even know what is going on inside. They must keep cooling the crippled reactors by water, but additionally groundwater keeps flowing into the reactor buildings from the broken parts. This is why highly contaminated water is always produced more than it can circulate. Tepco is planning to officially discharge this water to the Pacific but Tritium is still remaining in it. They dilute this with seawater so that it is legally safe, but scientifically the same amount of radioactive tritium is contained. They say it is safe to discharge, but none of them have drunk it.

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