Greenpeace has urged Tepco to abandon plans to flood the container with water, given the likelihood that melted fuel has damaged it. Shaun Burnie, nuclear adviser to Greenpeace Germany, said: "Flooding a reactor that has fuel [that has fallen] through the pressure vessel is not a good idea."

　Outlining a worst-case scenario, Burnie said very large amounts of cold water hitting the melted fuel could cause an explosion, trigger substantial damage to the reactor and create a "high risk of atmospheric release running for days, if not weeks." He added: "I think [the flooding option] will now be scrapped."
　
　 John Large, an independent nuclear engineering consultant in London, said Tepco's plan to flood the reactor was riddled with "potential risks". It appeared not to have factored in the extent of damage to the fuel rods and the structural state of the containment vessel, including whether it was watertight. "It seems to be poorly thought through," he said, adding that the firm had not demonstrated that the strategy could work.

要点は、燃料棒がどのようになっているか状態もわからずに実行
することは、新たな危険を呼び込む恐れがある。
上記、英国ガーディアン誌より引用