Iodine pit

Development of (1) concentration of 135Xe and (2) reactor reactivity after reactor shutdown. (Until shutdown the neutron flux was φ=1018 neutrons/(m2·s).)

The iodine pit, also called the iodine hole or xenon pit, is a temporary disabling of a nuclear reactor due to buildup of short-lived nuclear poisons in the reactor core. The main isotope responsible is xenon, mainly produced by natural decay of iodine. I is a weak neutron absorber, while Xe is the most powerful known neutron absorber. When Xe builds up in the fuel rods of a reactor, it significantly lowers their reactivity, by absorbing a significant amount of the neutrons which provide the nuclear reaction.

单词	Reactor poisoning
释义	Reactor poisoning 英语百科 Iodine pit The iodine pit, also called the iodine hole or xenon pit, is a temporary disabling of a nuclear reactor due to buildup of short-lived nuclear poisons in the reactor core. The main isotope responsible is xenon, mainly produced by natural decay of iodine. I is a weak neutron absorber, while Xe is the most powerful known neutron absorber. When Xe builds up in the fuel rods of a reactor, it significantly lowers their reactivity, by absorbing a significant amount of the neutrons which provide the nuclear reaction.
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Reactor poisoning

Iodine pit