...On the other hand, in fast breeder reactors, the absorption cross section of fast neutrons involved in nuclear fission does not vary much depending on the element, but even among these, elements with a large cross section are preferred, such as B 4 C and Ta. Neutron absorbers are used in (1) control rods, (2) liquid absorbents, and (3) burnable poisons. For example, in boiling water reactors, powder of boron carbide B 4 C is sealed in a stainless steel tube, and in pressurized water reactors, Ag-In-Cd alloy is sealed in a stainless steel tube for use as a control rod. ... *Some of the terminology that refers to "flammable toxic substances" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…一方,高速増殖炉で核分裂にかかわる高速中性子の吸収断面積は元素によって大差ないが,これらにおいても断面積の大きなものがよく,B4CやTaなどが使用される。 中性子吸収材の使用方法としては,(1)制御棒,(2)液体吸収材,(3)可燃毒物(バーナブルポイズン)がある。使用形態の例としては,沸騰水型炉ではホウ素の炭化物B4Cの粉末をステンレス鋼管の中に封入したもの,加圧水型炉ではAg‐In‐Cd合金をステンレス鋼管に封入したものが制御棒として使用されている。… ※「可燃毒物」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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