Hitachi, Ltd.

Other

Hiatchi, Ltd.

Yoshiyuki Takamori

Shuichi Suzuki

Jun Kawaji

Masanori Sakai

Yuichi Satsu

Tomoichi Kamo

Kishio Hidaka

Yasuhisa Aono

Mitsuo Hayashibara

Makoto Morishima

Yamato Asakura

Masato Nakamura

Chahn Lee

Seunghwan Park

Makoto Takahashi

Masahiko Ogino

Akihiro Miyauchi

Takashi Ando

Makoto Nagase

Hiroo Yoshikawa

Kazushige Ishida

Katsumi Ohsumi

Osamu Kubota

Hidetoshi Honbo

Hideyuki Hosokawa

Yoichi Wada

Masanori Miyagi

Kenichi Souma

Naohito Uetake

Xudong Zhang

Kazumi Anazawa

Kouji Hayashi

Tadashi Tamagawa

Kazuhiko Akamine

Ryou Ishibashi

Miyuki Kawata

Nagao Suzuki

Atsuhiko Onuma

An embodiment of the process state analysis device of the present invention is provided with an evaluation value calculation unit and a graph creation unit. The evaluation value calculation unit calculates, within an evaluation value calculation range indicating a target range for calculating evaluation values, an evaluation value for each cluster that is classified on the basis of multi-dimensional process data output from each measurement device. The graph creation unit determines a hue for a graph element for each cluster on the basis of the evaluation value for the cluster as calculated within the evaluation value calculation range, and on the basis of a color reference evaluation value corresponding to a reference hue for the graph element, and creates and outputs a graph representing, for each aggregation unit time interval in a specified display period, the number of nodes belonging to each cluster.

Process state analysis device and process state display method

In order to realize stable quality control, provided is a quality control device () having an input device which receives data such as an operation condition of each device () to () in a production system () for producing a product; a calculation unit which assigns a value of the operation condition to a correlation formula calculated in advance and calculates a value derived from the correlation formula; and a determination unit which performs good or bad determination on a quality of a workpiece in each process, on the basis of a result calculated by the calculation unit. Further, when 'bad' is determined as a result of the good or bad determination, the quality control device () calculates an appropriate value of the operation condition and sets the value to each device () to ().

Quality control device and quality control method

Provided are an optical sensor and an analyzer, including an optical sensor section in which a cladding layer of an optical fiber is removed so as to expose a core layer by a predetermined optical path length, and a protective material is added to a surface of the exposed core layer, the protective material having higher resistance to an organic solvent, base, or acid than that of the cladding layer; a light source device that causes light to enter one end of the optical fiber; a light receiving device that receives transmitted light emitted from another end of the optical fiber; and a control device that controls the light source device and the light receiving device to measure optical transmittance in the optical sensor based on a ratio of intensity of the light emitted from the light source device to intensity of the light received by the light receiving device.

Optical sensor and analyzer using the same

A fuel rod and a fuel assembly for light water reactors, in which crack penetration to a fuel cladding tube or an end plug can be prevented, are provided. The fuel rodincludes: a cylindrical cladding tubeformed of a ceramic base material; a connectionformed of the same material as the cladding tube; and an end plughaving a concave portionof a continuously curved surface shape adapted to house the connection. The end plugis formed of the same material as the cladding tube. A slanted surfaceformed at an end portion of the cladding tube, and a slanted surfaceformed at an end portion of the end plugare joined in contact with each other with a metallic joint material. The joint is supported by the connection

Light water reactor fuel rod having ceramic cladding tube and ceramic end plug

The present invention provides a method of preventing liquid fuel that has penetrated from an anode from reaching a cathode and of effectively utilizing a cathode catalyst, which provides a membrane electrode assembly for fuel cell having high output density. In a membrane electrode assembly for fuel cell including an anode formed of a catalyst and a solid polymer electrolyte, a cathode formed of a catalyst and a solid polymer electrolyte, and a solid polymer electrolyte membrane formed between the anode and the cathode, an intermediate layer is formed between the cathode and the electrolyte membrane.

Membrane electrode assembly for fuel cell

Disclosed is a fuel cell in which a membrane electrode assembly less undergoes increase in ion conduction resistance, and a polymer electrolyte membrane less undergoes deterioration. Specifically, the polymer electrolyte membrane includes a first membrane and a second membrane being two different membranes composed of polymer electrolytes having different ion-exchange capacities, in which the first membrane has an area of one surface thereof equal to or larger than an area of one surface of an anode or a cathode, and the second membrane has an area of one surface thereof smaller than that of the first membrane and is arranged in a gas inflow region on a side being in contact with the cathode. The second membrane has an ion-exchange capacity smaller than that of the first membrane or has a number-average molecular weight larger than that of the first membrane.

Polymer electrolyte membrane, and membrane electrode assembly and polymer electrolyte fuel cell using the same

The membrane electrode assembly includes an anode including a catalyst and a solid polymer electrolyte; a cathode including a catalyst and a solid polymer electrolyte; a solid polymer electrolyte membrane interposed between the anode and the cathode; an anode gas diffusion layer; and a cathode gas diffusion layer, a set composed of the anode, the cathode and the solid polymer electrolyte membrane being interposed between the anode gas diffusion layer and the cathode gas diffusion layer, wherein the cathode gas diffusion layer contains an oxidation catalyst and a water-repellent resin.

The present invention provides an electrolyte membrane for a fuel cell that has a minute projection cluster on one side or both sides of a polymer electrolyte membrane. Further, the present invention provides a production method of an electrolyte membrane for a fuel cell, wherein a mold comprising convex portions having a fixed planar pattern is pressed on one side or both sides of a polymer electrolyte membrane, then while concave portions of the polymer electrolyte membrane formed in the concave portions are being stretched, the mold is removed from the polymer electrolyte membrane for forming a minute projection cluster.

Electrolyte membrane for fuel cells, its production and fuel cell using the same

A catalytic material and electrode of the present invention are characterized in that the catalyst carrier constituting the above-mentioned catalytic material and electrode includes at least one member selected from the group consisting of nitrogen atoms, oxygen atoms, phosphor atoms, and sulfur atoms. Since the cohesion or growth of catalyst grains can hereby be suppressed, it is possible to provide a highly active catalyst, a high-performance electrode, and a high-output-density fuel cell which uses the same.

Covalently bonded catalyst carrier and catalytic component

Catalytic material, electrode, and fuel cell using the same

In a nuclear power plant, by injecting an amount of hydrogen small enough not to increase a radiation dose rate of the main steam system, ECP of metallic component materials composing a nuclear reactor can be decreased to suppress the potential of occurrence of IGSCC, and the control can be easily performed, and the operating cost can be suppressed to increase. Occurrence of intergranular stress corrosion cracking in metallic component materials in contact with reactor cooling water is suppressed by injecting zirconium hydroxide and hydrogen into the reactor cooling water to decrease the electrochemical corrosion potential of the metallic component materials.

Method of operating nuclear power plant, nuclear power plant, and method of controlling water chemistry of nuclear power plant

To suppress a decrease of thickness due to corrosion of structural members and to achieve a removal of radionuclides with good efficiency in a nuclear power plant, oxidation decontamination is first conducted. An aqueous potassium permanganate solution is supplied from a circulation line to a reactor pressure vessel, which is a stainless steel structural member, and a reactor water cleanup system piping and a drain piping, which are carbon steel structural members. These structural members are oxidation-decontaminated by the action of potassium permanganate. Then the above-mentioned structural members are reduction-decontaminated by using an aqueous oxalic acid solution. The aqueous oxalic acid solution contains hydrazine.

Method of chemical decontamination

Surfaces of the structural components of a nuclear power plant exposed to reactor water are wetted with an electroless plating solution containing an electrical insulating substance. The electrical insulating substance has a high resistivity about 10 (100000) times those of the structural components of the nuclear power plant or above. A metal film containing the electrical insulating substance is formed on the surfaces of the structural components exposed to the reactor water by wetting the surfaces of the structural components with the electroless plating solution. Thus, the electrochemical corrosion potential of the structural components is reduced regardless of whether hydrogen is injected into the reactor water.

Treatment method of nuclear reactor internal component

Growing community of inventors

Hitachinaka, Japan

Yoshiyuki Takamori