Kabushiki Kaisha Toshiba

The Tokyo Electric Power Company, Incorporated

Ishikawajima-harima Heavy Industries Co., Ltd.

Toshiba Energy Systems & Solutions Corporation

Masato Okamura

Seiji Yamamoto

Osamu Shibasaki

Kenji Yamazaki

Tetsuo Oosato

Koji Negishi

Junichi Takagi

Hajime Hirasawa

Shunichi Suzuki

Tetsuji Kaneko

Toyoaki Miyazaki

Hidehiro Urata

Hiroyuki Arai

Minoru Kobayashi

Nagayoshi Ichikawa

Tadasu Yotsuyanagi

Kenro Takamori

Junichi Suzuki

Mitsuru Sambongi

Yuichi Fukaya

Takashi Hirano

Kazuo Murakami

Takeshi Shibano

Kunihiko Kinugasa

Akio Sayano

Norihisa Saito

Yutaka Uruma

Yasuo Morishima

Hiromichi Koga

Takasi Hirano

Yukio Henmi

Takahiro Hara

Yusuke Horayama

A chemical solution injection systemof an embodiment includes: a chemical solution reservoirthat stores a chemical solution containing a depositing substance to deposit to a member in contact with cooling water for absorbing heat in a plant; a pipethrough which the chemical solution passes; a first heat exchanger and a second heat exchanger that exchange heat between the cooling water and the chemical solution; a cooling water pipewhich connects the heat exchangers in series and in which the cooling water passes; and a pumpthat conveys the chemical solution. The temperature of the chemical solution in the chemical solution reservoiris lower than that of the cooling water. The pipesequentially connects the chemical solution reservoir, the first heat exchanger, the second heat exchanger and the plant. The cooling water guided from the inside of the plant passes through the second heat exchanger and subsequently passes through the first heat exchanger. The chemical solution passes through the first heat exchanger and subsequently passes through the second heat exchanger.

Chemical solution injection system and chemical solution injection method

In a plant including a system which is provided with a steam generator, a turbine, a condenserand a heaterand in which non-deaerated water circulates, and a pipe, the steam generator, the heaterandof the system which comes into contact with the non-deaerated water is deposited with a protective substance.

Method for suppressing corrosion in plant and plant

The present invention provides a corrosion-resistant structure for a high-temperature water system comprising: a structural material; and a corrosion-resistant filmformed from a substance containing at least one of La and Y deposited on a surface in a side that comes in contact with a cooling water, of the structural materialwhich constitutes the high-temperature water system that passes a cooling waterof high temperature therein. Due to above construction, there can be provided the corrosion-resistant structure and a corrosion-preventing method capable of operating a plant without conducting a water chemistry control of cooling water by injecting chemicals.

Corrosion-resistant structure for high-temperature water system and corrosion-preventing method thereof

A coating of niobium oxide, zirconium titanate, or nickel titanate is formed on at least a part of a surface of a jet pump member constituting a jet pump serving as a reactor internal structure of a boiling water reactor. Further, a solution containing, e.g., a niobium compound is applied to at least a part of the surface of the jet pump member constituting the jet pump, and the jet pump member coated with the solution is heat-treated to form a coating of, e.g., niobium oxide. With this configuration, the jet pump member constituting the jet pump of the boiling water reactor is provided such that deposition of crud can be sufficiently suppressed on the jet pump member.

Reactor internal structure and method of manufacturing the same

A photocatalyst injection system including: a reactor primary system coolant collection section collecting a reactor primary system coolant containing a noble metal or noble metal ion from a reactor primary system; a photocatalyst addition section adding a photocatalyst to the collected reactor primary system coolant; an ultraviolet irradiation section irradiating, with ultraviolet rays, the coolant to which the photocatalyst has been added for producing, in the coolant, a noble metal-carrying photocatalyst in which the noble metal is carried on a surface of the photocatalyst; and a noble metal-carrying photocatalyst injection section injecting the coolant containing the noble metal-carrying photocatalyst into the reactor primary system.

Photocatalyst injection method and photocatalyst injection system

A method for controlling water chemistry in a power generation plant including a low-pressure feedwater heater (), a deaerator (), and a high-pressure feedwater heater () disposed sequentially along a feedwater pipe () from a condenser () to a steam generator or a boiler () to control the chemistry of feedwater guided to the steam generator or the boiler includes the steps of: injecting an oxidant through an oxidant injection line () into feedwater flowing through the feedwater pipe disposed downstream of the condenser in such a way that a dissolved oxygen concentration in the feedwater ranges from 3 to 100 ppb while the feedwater is maintained to be neutral to form an oxide film on surfaces of the feedwater pipe, the low-pressure feedwater heater, the deaerator, the high-pressure feedwater heater, and other structural members that come into contact with the feedwater; and injecting a deoxidant through a deoxidant injection line () into the feedwater flowing through the feedwater pipe disposed downstream of the deaerator in such a way that the dissolved oxygen concentration in the feedwater flowing into the steam generator or the boiler lowers to 5 ppb or lower.

Method and system for controlling water chemistry in power generation plant

A method for injecting a corrosion inhibitor injecting an oxidant and an anticorrosive agent-pH adjusting agent complex including an anticorrosive agent and a pH adjusting agent adsorbed on a surface of the anticorrosive agent into high temperature water in contact with a surface of a metal structural material and irradiating the high temperature water with a radioactive ray or an ultraviolet ray, wherein the anticorrosive agent of the anticorrosive agent-pH adjusting agent complex has, on the surface of the anticorrosive agent, an active site where the pH adjusting agent reacts with the oxidant, and the pH adjusting agent present on the surface of the anticorrosive agent of the anticorrosive agent-pH adjusting agent complex and/or in the high temperature water is oxidized with the oxidant by the irradiation with the radioactive ray or the ultraviolet ray to change pH adjusting ability of the pH adjusting agent and shift a pH of the high temperature water to a neutral side, and thereby deposition of the anticorrosive agentto the metal structural materialis accelerated.

Corrosion inhibitor injecting method

A corrosion-resistant member has a composite titanium oxide film for reducing corrosion deposited on a surface of a construction material, where the composite titanium oxide film is represented by a molecular formula MTiOin which M is a transition element, and the corrosion-resistant member is preliminarily manufactured by depositing titanium oxide on the surface of the construction material, and the titanium oxide is subsequently or simultaneously subjected to high temperature treatment under existence of an ion of the transition metal.

Corrosion-resistant member and method of manufacturing the same

The present invention provides an operation method of a plant which has a low-pressure feed water heater, a deaerator and a high-pressure feed water heater sequentially arranged in a feed water pipe reaching a steam generator from a condenser, and leads high-temperature feed water to the steam generator, wherein an oxidant is injected onto a surface of a structural material from an oxidant injection line in order to form a film that suppresses an elution of an element constituting the structural material such as the feed water pipe, the low-pressure feed water heater, the deaerator and the high-pressure feed water heater, which come in contact with the high-temperature feed water, and a corrosion suppression substance is further introduced from a corrosion suppression substance introduction line in order to deposit the corrosion suppression substance on a surface of the structural material in which corrosion accelerated by a flow of the feed water occurs.

Plant operation method and plant operation system

Provided is a method for monitoring corrosion in a power plant, including: forming a film with a composition of M1FeO(M1 is a trivalent or tetravalent metal) or M2FeO(M2 is a divalent metal) on the inner wall surface of an apparatus of the power plant; and maintaining the film stably by controlling the amount of introduction of oxygen into the apparatus commensurate with a temperature in the apparatus.

Method for monitoring corrosion protection in power plant

In a method of reducing corrosion of a material constituting a nuclear reactor structure, an electrochemical corrosion potential is controlled by injecting a solution or a suspension containing a substance generating an excitation current by an action of at least one of radiation, light, and heat existing in a nuclear reactor, or a metal or a metallic compound forming the substance generating the excitation current under the condition in the nuclear reactor to allow the substance generating the excitation current to adhere to the surface of the nuclear reactor structural material, and by injecting hydrogen in cooling water of the nuclear reactor while controlling the hydrogen concentration in a feed water.

Method of reducing corrosion of nuclear reactor structural material

In a nuclear power plant, a corrosion-resistant oxide film on a surface of the metal component of a reactor structure is exposed to a high-temperature water, the corrosion-resistant oxide film containing an oxide having a property of a P-type semiconductor, and a catalytic substance having a property of an N-type semiconductor is deposited on the oxide film. The oxide film maintains the property of the P-type semiconductor.

Nuclear power plant, method of forming corrosion-resistant coating therefor, and method of operating nuclear power plant

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Yokohama, Japan

Masato Okamura