Hitachi-ge Nuclear Energy, Ltd.

Hitachi, Ltd.

Mitsubishi Hitachi Power Systems, Ltd.

Hitachi Astemo Ltd.

Atsushi Baba

So Kitazawa

Yoshinori Musha

Takashi Ito

Tetsuya Matsui

Hidenori Shinohara

Yuji Matsui

Seiichi Katou

Naoyuki Kono

Masahiro Koike

Atsushi Fushimi

Hirohisa Mizota

Minoru Ootaka

Masahiro Hiratsuka

Kouichi Kurosawa

Izumi Yamada

Fujio Yoshikubo

Ryo Kuwana

Masahiro Tooma

Isao Hara

Hideki Hanami

Daisuke Shinma

Akira Murata

Tamotsu Asano

Ryuta Hama

Mikio Koyama

Hiroaki Katsuyama

Taro Ikezumi

Shohei Numata

Keisuke Masuda

A heat-resistant ultrasonic sensor forms a piezo-electric ceramics film with a thickness of 0.5 mm or smaller and a Curie point of 200&#xb0; C. or higher on a flexible metal plate. A thin metal film that is an electrode is attached to a top surface of the piezo-electric ceramics film and a metal wire mesh covers the thin metal film and is attached to a top surface of the thin metal film. A core of a heat-resistant coaxial cable is connected to the metal wire mesh at a connection point. The heat-resistant coaxial cable is fixed to the thin metal plate with a metal fixing member that is a ground portion. An electric insulating cover is attached to the thin metal plate and covers the piezo-electric ceramics film, the thin metal film, the metal wire mesh, the connection point, the fixing member, and the core of the coaxial cable.

Heat-resistant ultrasonic sensor and installation method thereof

An ultrasonic reactor water level measuring device and an evaluation method are provided and prevent a reduction in the measurement accuracy of a water level that is in a wide measurement range. The ultrasonic reactor water level measuring device includes an upper tube extending from a gas phase portion in a reactor, a lower tube extending from a liquid phase portion in the reactor, measurement tubes connected to each other and arranged at multiple stages between the upper tube and the lower tube, and units for generating and receiving ultrasonic waves, the units being arranged at bottom portions of the measurement tubes. The ultrasonic reactor water level measuring device measures levels of water within the measurement tubes and calculates a water level within the reactor from the sum of the measured water levels, the sum excluding an overlapped part of the measurement tubes.

Ultrasonic reactor water level measuring device and evaluation method

Hydrogen which has entered into a pressure/differential pressure transmitter from external or internally generated hydrogen and hydrocarbons are converted to air bubbles within pressure guide paths. As a result, the indicated value drifts and an accurate numerical value is not output. A pressure/differential pressure transmitter includes a space formed between a diaphragm and a main body side wall face, pressure guide paths connected to the main body side wall face, a sealed liquid sealed in the space and the pressure guide paths to transmit a pressure received by the diaphragm to a sensor, and a hydrogen absorption material provided at least in the sealed liquid, on the main body side wall face, or in a part of a path between the main body side wall face and the sensor to absorb hydrogen atoms in the sealed liquid.

Pressure transmitter and transmission method

An ultrasonic inspection method and an ultrasonic inspection device allow three-dimensional inspection data and three-dimensional shape data to be appropriately positioned on a display screen and allow a defect echo and a shape echo to be quickly identified even when information on the relative positions of a probe and an object to be inspected is not provided. The ultrasonic inspection data that is generated from the waveforms of ultrasonic waves received by an ultrasonic probe is compared with a plurality of ultrasonic propagation data pieces calculated by a ray tracing method on the basis of the three-dimensional shape data on an object to be inspected. The position of the three-dimensional inspection data or the three-dimensional shape data is moved relative to the other data position on the basis of the comparison results, thereby displaying the three-dimensional inspection data and the three-dimensional shape data while overlapping each other.

Ultrasonic inspection method and ultrasonic inspection device

Vibration of a jet pump installed in a reactor pressure vessel of a boiling water reactor is monitored. Ultrasonic waves are transmitted from an ultrasonic sensor installed on an outer surface of the reactor pressure vessel toward a throat and a diffuser of the jet pump. When the ultrasonic waves reach respective outer surfaces of the throat and diffuser, reflected waves are generated at the respective outer surfaces. The ultrasonic sensor receives those reflected waves. The ultrasonic signal process section obtains a distance in the horizontal direction between the throat and the diffuser based on a time difference of the reflected waves reflected from respective reflection surfaces of the throat and diffuser and a sound speed in reactor water in the neighborhood of the throat and diffuser. A relative vibration is obtained based on the change with time of the distance.

Nuclear reactor vibration monitoring apparatus and method of monitoring nuclear reactor vibration

An ultrasonic testing method is provided to measure a thickness of an object in a simple and highly accurate manner when crystal grains that form a metal solidification structure of a directionally-solidified material cast or the like have a statistical variation. An ultrasonic probecauses a longitudinal ultrasonic wave to be incident on a test objectin a direction perpendicular to a surfaceA of the test object. As a velocity of the longitudinal ultrasonic wave, the average of velocities of longitudinal ultrasonic waves propagating in directions of crystal orientations &#x3c;100&#x3e;, &#x3c;110&#x3e;, and &#x3c;210&#x3e; is used. The thickness of the test objectis measured on the basis of the velocity of the ultrasonic wave and a time period for the propagation of the ultrasonic wave.

Ultrasonic testing method

A jet pump beam (hereinafter, referred to as a beam) is fitted into a pair of projecting portions installed to a transition piece, and after the beam is arched, a beam bolt engaged with the beam is tightened. An end of the beam bolt comes in contact with a top surface of an insert member fitted into an elbow disposed between the pair of projecting portions. An ultrasonic sensor head is fixed to the beam bolt, and ultrasonic waves are sent to the beam bolt from the ultrasonic sensor in the ultrasonic sensor head. An ultrasonic measuring apparatus obtains echo intensity of each of reflected waves generated at the end of the beam bolt and a bottom surface of the insert member, and based on the echo intensities, an echo intensity ratio R is calculated. The installed state of the beam is checked using the echo intensity ratio R.

Method of checking installed state of jet pump beam

An apparatus and a method for ultrasonic testing obtains high-resolution and high-S/N ratio testing results by driving a number of piezoelectric elements using fewer pulsers and receivers in comparison with the number of elements composing an array transducer. A sensor information setter sets a plurality of piezoelectric element groups used for transmission and a plurality of piezoelectric element groups used for reception among the plurality of piezoelectric elements composing an ultrasonic array transducer. A computer transmits an ultrasonic wave from the element cluster set for transmission, and stores an ultrasonic wave received by the element cluster set for reception. The procedure is repeated including different element cluster sets for transmission and reception to obtain first receive signals. The first receive signals are summed to obtain a second receive signal; and the second receive signal is displayed with reference to the sensor center position on a display unit.

Apparatus and method for ultrasonic testing

An ultrasonic inspection device allows position adjustment of three-dimensional inspection data and shape data to be easily performed on a display screen and allows a defect echo and a shape echo to be quickly identified. A calculator generates the three-dimensional inspection data from waveforms stored in a data storage unit. A three-dimensional display unit displays the three-dimensional inspection data generated by the calculator and the three-dimensional shape data on an object to be inspected. The calculator corrects the relative displayed positions of the three-dimensional inspection data and the three-dimensional shape data on the basis of a coordinate system defined by points and a surface that constitute a part of the three-dimensional shape data displayed by the three-dimensional display unit, and causes the three-dimensional display unit to display the three-dimensional inspection data and the three-dimensional shape data while the three-dimensional inspection data and the three-dimensional shape data overlap each other.

Ultrasonic inspection device and ultrasonic inspection method

Ultrasonic inspection equipment facilitates alignment of display positions of three-dimensional ultrasonic inspection data and three-dimensional shape data, and quickly discriminates between a defect echo and an inner-wall echo. A computerA has a position correction function of correcting a relative display position between three-dimensional shape data and three-dimensional ultrasonic inspection data. A display position of the three-dimensional ultrasonic inspection data or that of the three-dimensional shape data is moved by a norm of a mean vector along the mean vector that is calculated from a plurality of vectors defined by a plurality of points selected in the three-dimensional ultrasonic inspection data and by a plurality of points selected in the three-dimensional shape data. The three-dimensional shape data and the three-dimensional ultrasonic inspection data are displayed in such a manner as to be superimposed on each other on a three-dimensional display unitC.

Ultrasonic inspection equipment and ultrasonic inspection method

An ultrasonic measurement method and an ultrasonic measurement apparatus are capable of performing an inspection for a short time with a high SN ratio and a small variation An ultrasonic measurement method and an ultrasonic measurement apparatus are capable of performing an inspection for a short time with a high SN ratio and a small variation in sensitivity in a process for detecting a defect in all directions at 360 degrees using a matrix array sensor without performing mechanical scanning in all directions, while reducing noise that is caused by a bottom surface echo. An element selecting circuit selects a group of a plurality of ultrasonic transducer elements for transmission from among ultrasonic transducer elements that constitute a two-dimensional array sensor so that the ultrasonic transducer elements for selected for transmission are arranged in line symmetry with respect to a first line symmetric axis to set the group selected for transmission. The element selecting circuit selects a group of a plurality of ultrasonic transducer elements for reception so that the ultrasonic transducer elements selected for reception are arranged in line symmetry with respect to a second line symmetric axis that is perpendicular to the first line symmetric axis to set the group selected for reception. A transmitting element selector selects, as transmitting elements, the ultrasonic transducer elements set by the element selecting circuit. A receiving element selector selects, as receiving elements, the ultrasonic transducer elements set by the element selecting circuit.

Ultrasonic measurement method, ultrasonic measurement apparatus, and ultrasonic sensor

A high-pressure water jet is injected from a nozzle scanned and a shock wave generated due to the collapse of bubbles included in the water jet is impacted on a WJP execution object. Tensile residual stress close to the surface of the WJP execution object is improved to compressive residual stress. The shock wave is detected by a pressure sensor and a shock wave generation frequency is obtained. Whether the obtained shock wave generation frequency is larger than a set value or not is decided. When the shock wave generation frequency is larger than the set value, a high-pressure pump is stopped and the injection of the water jet from the nozzle is stopped. When the shock wave generation frequency is equal to or smaller than the set value, the operation condition of the high-pressure pump is changed. The pressure of the water jet injected from the nozzle is increased and the WJP is executed for a part of the WJP execution object where the shock wave generation frequency is equal to or smaller than the set value. Improvement effect of the residual stress of the WJP execution object can be confirmed more accurately.

Water jet peening method and apparatus thereof

An ultrasonic probe issues an ultrasonic wave to an object, receives a reflected wave from an object, and is provided with multiple piezoelectric elements. A three-dimensional display section displays three-dimensional flaw detection data superimposed on three-dimensional shape data of an object. The computer acquires a reflected ultrasonic wave signal from a reference object (reference). Based on the acquired signal, the computer corrects a reflected ultrasonic wave signal acquired from another object having the same material and shape as the reference. The computer allows the three-dimensional display section to display three-dimensional flaw detection data generated from a reflected ultrasonic wave signal resulting from a difference between a reference and an object.

Ultrasonic flaw detector and ultrasonic flaw detection method

An ultrasonic measurement method and an ultrasonic measurement apparatus are capable of performing an inspection for a short time with a high SN ratio and a small variation (that depends on an inspection direction) in sensitivity in a process for detecting a defect in all directions at 360 degrees using a matrix array sensor without performing mechanical scanning in all directions, while reducing noise that is caused by a bottom surface echo. An element selecting circuit selects a group of a plurality of ultrasonic transducer elements for transmission from among ultrasonic transducer elements that constitute a two-dimensional array sensor so that the ultrasonic transducer elements for selected for transmission are arranged in line symmetry with respect to a first line symmetric axis to set the group selected for transmission.

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Tokai, Japan

Atsushi Baba