Hitachi-ge Nuclear Energy, Ltd.

Sohei Fukui

Motoi Tanaka

Kazuo Tominaga

Tomoharu Hashimoto

Kazushige Ishida

Yoshihiko Ishii

Kazuaki Kito

Tomohiko Ikegawa

Masaaki Tanaka

Takahisa Matsuzaki

Masataka Hidaka

Katsuki Hamada

Fumio Totsuka

As an organic iodine remover that removes organic iodine in a containment vessel of a nuclear reactor, an organic agent (for example, an ionic liquid, an interfacial active agent, a quaternary salt, or a phase transfer catalyst) having a function of dissolving and decomposing the organic iodine and retaining iodine is used. The organic iodine remover is a substance composed of a cation and an anion. The organic iodine remover is, in particular, an organic iodine remover in which, in a structure of the cation of the organic agent, carbon or oxygen is bonded to, via a single bond, to a phosphorus element, a sulfur element or a nitrogen element, the number of carbon chains is 2 or more, and an anionic structure is configured with a substance with high nucleophilicity. By using such an organic agent, the organic iodine is removed with an efficiency of 99% or more.

Organic iodine remover

There is provided an organic iodine trapping apparatus that can efficiently trap an organic iodine without using complicated or large equipment. An organic iodine trapping apparatusis an apparatus that traps an organic iodine, including: a trapping vesselthrough which gas containing an organic iodine is passed; an organic iodine remover(Example: trihexyl (tetradecyl) phosphonium chloride, or the like) that is disposed in or injected into the trapping vesseland decomposes the organic iodine; and a trapping materialthat is disposed in or injected into the trapping vesseland traps iodine ions generated by decomposition of the organic iodine, in which the trapping materialis a metal (Example: silver or the like) or a metal compound (Example: silver chloride, silver oxide, or the like).

Organic iodine trapping apparatus

In view of above problems, an object of the invention is to provide a primary containment vessel venting system having a structure capable of continuously discharging vapor in a primary containment vessel out of the system and continuously reducing pressure of the primary containment vessel without discharging radioactive noble gases to the outside of the containment vessel and without using an enclosing vessel or a power source. In order to achieve the above object, an nuclear power plant of the invention includes a primary containment vessel which includes a reactor pressure vessel, a radioactive substance separation apparatus which is disposed inside the primary containment vessel and through which the radioactive noble gases do not permeate but vapor permeates, a vent pipe which is connected to the radioactive substance separation apparatus, and an exhaust tower which is connected to the vent pipe and discharges a gas, from which a radioactive substance is removed, to the outside.

Nuclear power plant

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Tokyo, Japan

Sohei Fukui