…Focusing on this property, the radioactivity of spent fuel can be naturally reduced by safely storing it. The nuclear fuel cycle after the fuel has been used in the reactor is called downstream, while the part of the nuclear fuel cycle before it is put into the reactor is sometimes called upstream. In the downstream, the spent fuel must first be cooled and stored to reduce its radioactivity. … *Some of the terminology that refers to "upstream (nuclear fuel)" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…この性質に着目すれば,使用済燃料を安全に貯蔵しておくことによってその放射能を自然に下げることができる。燃料を原子炉で用いたのちの核燃料サイクルをダウン・ストリームといい,これに対し原子炉へ入れる前の核燃料サイクル部分をアップ・ストリームということがある。ダウン・ストリームでは,まずその放射能を下げるために,使用済燃料の冷却・貯蔵過程が必要である。… ※「アップ・ストリーム(核燃料)」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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〘noun〙① From the Nara period to the Heian period, ...
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