Hitachi, Ltd.

Ryuhei Kawabe

Yuzo Kadomukai

Yasushi Sasaki

Hiroyuki Nemoto

Shigeo Hatamiya

Minoru Oosuga

Junichi Yamaguchi

Teruhiko Minegishi

Yoshiyuki Kataoka

Masanori Naitoh

Hiroaki Suzuki

Masataka Hidaka

Shigehiro Shimoyashiki

Kotaro Inoue

Isao Sumida

Michio Murase

Tsuyoshi Niino

Toshitsugu Nakao

Takashi Ikeda

Kanehiro Ochiai

Yoshihiko Sato

Terufumi Kawasaki

Tohru Fukui

Yasuo Tachi

Toru Fukui

Tadashi Goto

Goro Aoyama

Yojiro Hayashi

The present invention provides a compact air induction system for an internal-combustion engine in which an air inlet section, a collection section and the intake port section for a plurality of cylinders of the internal-combustion engine are formed adjacent to each other and connected directly or through a partition wall. A control unit for controlling the engine is mounted in the passage at the downstream of the air inlet section.

Air induction system for internal-combustion engine

A pressure control chamber of a reactor containment vessel for receiving the atmosphere of the reactor containment vessel containing leakage steam developing in the event of an accident includes a pressure control pool, and a wet well disposed above the pressure control pool. The wet well is divided into an inner peripheral portion and an outer peripheral portion. The inner and outer peripheral portions are communicated with each other via the pressure control pool. An outlet port for flowing the atmosphere of the reactor containment vessel containing the leakage steam is provided at the inner peripheral side of the pressure control pool. When the atmosphere of the reactor containment vessel containing the leakage steam is introduced into the pressure control pool in the event of the accident, this atmosphere is condensed by the water in the pressure control pool, and the gas of this atmosphere not condensed is accumulated in the inner peripheral portion of the wet well. As a result, the pressure within the inner peripheral portion is increased to increase the water level of the pressure control pool at the outer peripheral portion, so that the area of contact of a reactor containment vessel wall with the pressure control pool water is increased, thereby enhancing a heat radiation performance of the reactor containment vessel.

Reactor containment vessel

A reactor containment vessel comprises typically a reactor pressure vessel housed in a dry well of the reactor containment vessel, a vent passage through which steam in the dry well is introduced into coolant accommodated in a pressure suppression chamber of the reactor containment vessel, a closed space formed at a position lower than the level of the normal liquid surface of the coolant, a first passage having an inlet opened into the pressure suppression chamber at a level higher than that of the normal liquid surface of the coolant and an outlet opened into the closed space, and a second passage communicating between the closed space and the dry well through a counter flow preventing arrangement for checking the flow directed toward the closed space, and therefore, noncondensable gas and liquid accumulated in the pressure suppression chamber are discharged into the dry well the pressure in which is higher than that in the pressure suppression chamber by making use of a difference in water head increased due to increase of the liquid while allowing fluid to be condensed to newly flow into the pressure suppression chamber from the dry well so as to be condensed, over a long cooling period after the occurrence of an accident of piping fracture in the reactor containment vessel. Owing to condensation, the pressure in the reactor containment vessel can be reduced, and moreover, fluid can make a natural circulation in a closed circuit passing through the dry well, the pressure suppression chamber and the closed space in order without flowing outside the circuit.

A method of restraining a diffusion of tritium and an apparatus for same are disclosed. The method includes the step of disposing a hydrogen-absorbing metal in a tritium passage in a direction of diffusion of tritium so that the hydrogen-absorbing metal absorbs tritium to be diffused. The apparatus includes a hydrogen-absorbing metal surrounding a device of a fast breeder reactor. The tritium to be diffused can be readily captured. An arrangement of capturing the tritium permeating the device is simplified in the present invention.

A system for restraining diffusion of tritium

Of the components making up the pump, one part including the bearing is removably assembled into the other part so that the bearing is received in the other part. This structure allows easy removal of the first part of the pump components from the second part for disassembly and for maintenance and inspection of the pump. The pump can also be reassembled with ease by inserting the first part into the other part.

Mechanical pump equipment

A circular electromagnetic flow coupler comprises a circular flow path, conductive partition walls which divide the circular flow path into generator side flow paths and pump side flow paths in the circumferential direction thereof, insulators for insulating the inside and outside of the flow paths, and magnetic poles for generating a magnetic field in the radial direction of the circular flow path. The insulators are provided with openings so that they are not damaged when pressure is exerted thereto.

Circular electromagnetic flow coupler

Growing community of inventors

Hitachi, Japan

Ryuhei Kawabe