Kabushiki Kaisha Toshiba

Japan Atomic Energy Agency

Takanari Inatomi

Hiroshi Nakamura

Toshiyuki Suzuki

Yasuhiro Sakai

Shigeki Maruyama

Toshiro Sakai

Kenjiro Fukamichi

Katsushi Hasegawa

Kazuhiro Watanabe

Akio Takahashi

Shoko Suyama

Mikio Izumi

Yasushi Tsuboi

Masafumi Komai

Hideo Kobayashi

Makoto Kuramochi

Yuko Kitajima

Ryutaro Hino

Seiji Kasahara

Shinji Kubo

Kaoru Onuki

Atsuhiko Terada

Ayano Ebihara

A fast reactorincludes: a reactor vesselaccommodating therein a coreand a primary coolant; a core supportsupporting the corefrom below; and a bulkheaddisposed on the core support, the bulkheadextending upward and surrounding the corefrom a lateral side. Between an inner surface of the reactor vesseland the bulkhead, there is disposed an intermediate heat exchangerconfigured to cool the primary coolant, and an electromagnetic pumpconfigured to pressurize the cooled primary coolant. A neutron shieldsupported by an upper supporting platefrom above is disposed below the electromagnetic pump. The upper supporting platehas an opening. Between an outletof the electromagnetic pumpand the upper supporting plate, there is disposed a coolant guide mechanismconfigured to guide the pressurized primary coolantfrom the electromagnetic pumpto the neutron shield through the openingof the upper supporting plate

Fast reactor

A neutron reactor includes a neutron shield which is disposed outside a nuclear reactor core and adapted to absorb neutrons leaking from the core. The neutron shield includes a plurality of containers each of which contains a powdered neutron absorbing material and which are stacked with one another in a vertical direction, and a cladding tube which houses the containers. The neutron absorbing material is composed of BC powder.

Neutron shield

A ceramic heat exchanger includes a heat exchange section that heat-exchanges between two fluids A and B flowing opposite directions to each other. The heat exchange section includes ceramic blocks stacked one on top of another with a seal therebetween. The ceramic blocks have a plurality of parallel lines of flow channels, each line defined by the flow channels through which the same fluid flows, any two adjacent lines being defined by the flow channels through which the different fluids A and B flow respectively. Both ends in the stacking direction of the stack are bound to join and integrate the ceramic blocks with tightening means including end plates and a tie rod. A thermal expansion absorber is disposed on an external surface of the end plates for absorbing thermal expansion in the axial direction of the tie rod.

Ceramics heat exchanger

A fast reactor having a reactivity control reflector has a reactor vessel in which a coolant is accommodated, a reactor core which is installed in the reactor vessel and dipped with the coolant, and a reflector installed outside of the reactor core so as to be movable in a vertical direction for controlling the reactivity of the reactor core. The reflector of the fast reactor has a lower neutron reflecting portion having a neutron reflection capability higher than that of the coolant and an upper cavity portion located above the neutron reflecting portion and having a neutron reflection capability lower than that of the coolant. The cavity portion is composed of a plurality of cylindrical hermetically-sealed vessels.

Fast reactor having reactivity control reflector

A heat exchanger includes a vertical pressure vessel having a air-tight structure, one and another sets of fluid inlet/outlet ports provided to upper and lower portion of the vertical pressure vessel, respectively, and a heat exchanging module disposed in the pressure vessel to a portion between both sets of the fluid inlet/outlet ports, the heat exchanging module being formed by stacking a number of heat exchanging elements. At least one set of the fluid inlet/outlet ports are configured to provide a header composed of a pipe structural member having a bottom portion closed and a heat insulating material attached to an inner surface of the pipe structural member, and end portions of fluid flowing pipes communicating with the heat exchanging module are opened at the closed fluid inlet/outlet ports in the header.

Heat exchanger

A fast reactorcontrolled with a reflector comprises: a reactor vesselaccommodating therein a coolant; a reactor coredisposed in the reactor vesseland immersed in the coolant; and a reflectorthat vertically moves for adjusting leakage of neutrons generated from the reactor coreto control a reactivity of the reactor core, the reflectorincluding a neutron reflecting partdisposed on an outside of the reactor corein a vertically movable manner, the neutron reflecting parthaving a neutron reflecting ability higher than that of the coolant, and a cavity partpositioned above the neutron reflecting part, the cavity parthaving a neutron reflecting ability lower than that of the coolant. The neutron reflecting partis formed of a plurality of metal platesthat are stacked on each other. Each of the metal plateshas a plurality of coolant channelsthrough which the coolantflows.

Fast reactor controlled with a reflector

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Kawasaki, Japan

Takanari Inatomi