Hitachi-Ge Nuclear Energy, Ltd.

Takahisa Matsuzaki

Kazuaki Kito

Tomohiko Ikegawa

Yoshihiko Ishii

Sohei Fukui

Masataka Hidaka

Hajime Furuichi

Katsuki Hamada

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

The invention provides a reactor containment vessel vent system capable of continuously releasing steam generated in a reactor containment vessel to the atmosphere even when a power supply is lost. In the reactor containment vessel vent system (), the noble gas filter () that allows steam to pass through but does not allow radioactive noble gases to pass through among vent gas discharged from the reactor containment vessel () is provided at a most downstream portion of the vent line. An immediate upstream portion of the noble gas filter () and the reactor containment vessel () are connected to each other by the return pipe () via the intermediate vessel (). Further, when the radioactive noble gases having pressure equal to or higher than predetermined pressure stays in the immediate upstream portion of the noble gas filter (), the staying radioactive noble gases flows into the intermediate vessel () by the relief valve (). Thus, the noble gas filter () does not lose steam permeability, and the reactor containment vessel vent system () can continuously release the steam to the atmosphere.

Reactor containment vessel vent system

An atomic power plant is provided including a primary containment vessel (PCV), a reactor pressure vessel (RPV), a main steam line, two steam safety relief valves (SRVs), a pressure suppression pool (S/P), an SRV exhaust pipewhich is connected to a quencher, a temperature measuring instrumentwhich measures a temperature inside the quencher, an SRV controllerwhich controls opening and closing of the SRVs. After a lapse of predetermined time from when the SRVis opened, in a case where it is determined that a temperature detected by the temperature measuring instrumentis equal to or smaller than a predetermined threshold value, the SRV controllercauses the SRVto which the temperature measuring instrumentdetecting the temperature leads, to be closed and to be prohibited from being opened.

Nuclear power plant that can automatically close a steam safety relief valve upon determination of exhaust pipe leakage

Growing community of inventors

Tokyo, Japan

Takahisa Matsuzaki