Kabushiki Kaisha Toshiba

Toshiba Energy Systems & Solutions Corporation

Japan Atomic Energy Agency

Rie Aizawa

Rei Kimura

Kenji Katsuki

Satoshi Wada

Jun Ito

Kuniaki Ara

Kouji Hiraiwa

Tsukasa Sugita

Shungo Sakurai

Junzo Taguchi

Ryoichi Sugawara

Takeshi Shimizu

Noriyuki Yoshida

Goro Yanase

Shinichiro Kawamura

Noriyuki Takeshima

Mamoru Konomura

Hiroshi Matsumiya

Fusao Saito

Tetu Suzuki

Yasushi Fujishima

Yoshitaka Chikazawa

Kousuke Aizawa

A method of producing a light water reactor fuel assembly may include: setting conditions at least concerning an operation cycle period and burnup; setting an initial enrichment of enriched uranium; calculating excess reactivity of a light water reactor core where light water reactor fuel assemblies including the enriched uranium are burned until an end stage of a final operation cycle; determining whether a condition where excess reactivity at an end of a first operation cycle in the burnup calculation step is close to a predetermined positive value is true or not; and returning to the setting of the initial enrichment, when it is determined at the determining that the situation is not true, or deciding an enrichment of the enriched uranium when it is determined that the situation is true.

Light water reactor fuel assembly, light water reactor core and MOX fuel assembly production method

According to an embodiment, a design method for a light-water reactor fuel assembly comprises: accumulating a determined fuel data, showing that each of a combination of p&#xb7;n/N and e is feasible as the core or not, wherein N is a number of the fuel rods in the fuel assembly, n is a number of the fuel rods containing the burnable poison, p is a ratio wt % of the burnable poison in the fuel, and e is an enrichment wt % of the uranium 235 contained in the fuel assembly; formulating a criterion formula which determines whether a combination of p&#xb7;n/N and e is feasible as a core or not and is formulated based on the determined fuel data; and determining whether a temporarily set composition of the fuel assembly is approved as a core or not based on the criterion formula.

Fuel assembly, core design method and fuel assembly design method of light-water reactor

Provided, in parallel to an electromagnetic pump in a power supply system, is an electromagnetic pump compensation power supply mechanism () that will perform a power-factor improving function as a synchronous machine during normal operation of a plant. The electromagnetic pump compensation power supply mechanism () is provided with an exciter stator permanent magnetic apparatus () that can switch an exciter between a non-excited state and an excited state. The exciter stator permanent magnet apparatus () comprises exciter stator permanent magnets (), springs () that apply force to the exciter stator permanent magnets () towards positions facing an exciter rotor winding (), and electromagnetic solenoids () that make the exciter stator permanent magnets () move to positions not facing the exciter rotor winding () in resistance to the force applied by the springs ().

Electromagnetic pump compensation power supply apparatus and electromagnetic pump system

An electromagnetic flowmeter designed to use a smaller excitation device and applicable to measurement on tubular channels of various sectional shapes. The electromagnetic flowmeter includes an excitation device for forming a magnetic field perpendicular to an outer wall of a tubular channel, and a pair of electrodes for measuring an electromotive force generated by the movement of the electroconductive fluid across the magnetic field. The electrodes and two magnetic poles of the excitation device are collectively placed on the outer wall at one side of the tubular channel.

Electromagnetic flowmeter including electrodes and magnetic pole placed in proximity on one side of the outer wall

Growing community of inventors

Yokohama, Japan

Rie Aizawa