Kabushiki Kaisha Toshiba

Nec Corporation

Toshiba Energy Systems & Solutions Corporation

Yoshihiro Kojima

Takashi Sato

Hirohide Oikawa

Keiji Matsumoto

Kazuhiro Okanoue

Go Tanaka

Hiroshi Terasaki

Yuka Suzuki

Yuji Komori

Mika Tahara

Makoto Akinaga

Ryoichi Hamazaki

Tomohisa Kurita

Seiichi Yokobori

Kenichi Utsuda

According to an embodiment, an emergency core cooling system has: three active safety divisions each including only one motor-driven active safety system; one passive safety division including a passive safety system; an emergency power source disposed in each of the active safety divisions to supply electric power to the motor-driven active safety system; and an advanced passive containment cooling system disposed in the passive safety division. Only two active safety divisions each includes a low pressure flooder system that is commonly used with a residual heat removal system as the only one motor-driven active safety system. The other active safety division includes an air-cooled injection system as the only one motor-driven active safety system.

Emergency core cooling system and boiling water reactor plant using the same

This system pertains to a communication processing system that effectively makes phone conversations possible from a communication terminal even in a non-business mode that does not identify a user. The communication processing system is provided with the following: a communication terminal; a storage unit that is provided inside the communication terminal or outside the communication terminal, and that stores the association between the communication terminal user-information and customer number, and stores a role number for the communication terminal; and an outgoing call relay unit that, in a case where the communication terminal is being used in a business mode that identifies the user thereof, relays an outgoing call from a call origination communication terminal to the communication terminal corresponding to the customer number, and that, in a case where the communication terminal is being used in a non-business mode that does not identify the user thereof, relays an outgoing call from the call origination communication terminal to the communication terminal corresponding to the role number.

Communication processing system, communication processing method, communication processing device, communication terminal, and control method and control program therefor

According to an embodiment, a nuclear reactor containment vessel has: a primary reactor containment vessel which contains a nuclear pressure vessel; a secondary reactor containment vessel and which is disposed outside the primary reactor containment vessel which has the pressure resistant properties and the leak-tightness which are equivalent to those of the primary reactor containment vessel; an air bag which is disposed within the secondary reactor containment vessel and which, when a failure occurs in primary reactor containment vessel, expands while receiving and encapsulating a high pressure gas discharged from the inside of the primary reactor containment vessel; and a gas phase vent pipe which connects the primary reactor containment vessel and the air bag.

Reactor containment vessel and nuclear power plant using the same

Core debris generated during a molten reactor core in a reactor containment vessel penetrating the reactor containment vessel is configured to be caught by a core catcher located beneath the reactor containment vessel which has a main body having first stage cooling water channels and second stage surrounded by cooling fins extending radially. The number of the second stage cooling channels is larger than that of the first stage cooling channels. Cooling water is supplied from a cooling water injection opening and distributed to the first cooling water channels at a distributor. An intermediate header is formed between the first and the second cooling water channels, and the cooling water is distributed to the second cooling water channels uniformly.

Core catcher, manufacturing method thereof, reactor containment vessel and manufacturing method thereof

A boiling water nuclear reactor comprises: a reactor containment vessel including a dry well and a wet well; a vent pipe connecting the dry well and the pressure suppression pool; a gravity-driven water injection pool to hold boric acid aqueous solution; an emergency core water-injection piping system for causing the boric acid aqueous solution in the gravity-driven water injection pool to fall so as to be injected into the reactor pressure vessel in case of reactor accident; a static containment vessel cooling system pool; a static containment vessel cooling system heat exchanger; a dry well connection pipe connecting an upper part of the static containment vessel cooling system heat exchanger and the dry well; and a gas vent pipe for discharging noncondensible gas in the static containment vessel cooling system heat exchanger into the inside of the pressure suppression pool.

Boiling water nuclear reactor and emergency core cooling system of the same

Growing community of inventors

Kanagawa, Japan

Yoshihiro Kojima