批评人士说，地下一次大的二氧化碳泄漏就像核燃料泄漏一样危险。

A large leak of underground carbon dioxide could be as dangerous as a leak of nuclear fuel, critics say.

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日本在1999年就曾发生过一次4级核事故（又称“东海村核事故”——译注），当时在日本核燃料转换公司（Japan NuclearFuel Conversion）的一个燃料厂内，三名正在为反应堆准备燃料的工人引发了一次链式核反应，使反应堆达到临界状态。

Japan itself had a Level 4 accident in 1999, when three workers preparing fuel for a reactor at a Japan Nuclear Fuel Conversion plant triggered a nuclear chain reaction, called a criticality.

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同时相比放射性燃料的一次性使用（即用完就作为核废料填埋），循环利用核燃料会大大增加成本。

However, reprocessing is controversial because the extracted plutonium can be used to produce nuclear weapons. It also costs substantially more than using fuel once and then storing it as waste.

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同时相比放射性燃料的一次性使用（即用完就作为核废料填埋），循环利用核燃料会大大增加成本。

However, reprocessing is controversial because the extracted plutonium can be used to produce nuclear weapons. It also costs substantially more than using fuel once and then storing it as waste.

youdao