Hitachi, Ltd.

Sho Kusumoto

Taro Iwamoto

Shimon Ando

Kazuo Sato

Hiroshi Sato

Katsukuni Hisano

Tsutomu Omae

Fumio Fujisawa

Koki Shiohata

Koji Kurokawa

Kazuhiro Yoshida

Takaichi Koyama

Yoshio Fukuda

Toshitaka Suzuki

Masato Nagao

Sadao Nemoto

Masaharu Ohno

Masatake Takidera

Kunio Hamada

Isao Ishida

Naoki Sakurama

In a method and a system for inspection of the inside of a nuclear reactor vessel in which an inspection device for inspecting a defect in a nuclear reactor vessel is so moved by a drive/control device as to permit inspection of a part to be inspected in the reactor vessel, and the presence or absence of defect in the reactor vessel is judged based upon information from the inspection device in the course of the above-mentioned movement of the inspection device; the movement of the inspection device is pursued and monitored by monitor means, and the movement of the inspection device is suppressed when an abnormality in the movement of the inspection device is judged based upon information from the monitor means, to avoid the abnormal movement.

Method and system for inspection of inside of nuclear reactor vessel

There is provided polychromatic X-ray source used in a polychromatic X-ray diffraction apparatus, in which polychromatic X-rays are cast upon a sample to be analyzed, the energies of the X-rays diffracted from the crystallographic planes of the sample are measured and the physical properties of the sample are detected on the basis of the measured energies. The polychromatic X-ray source has a container made of radiation shielding material and having an X-ray outlet channel and the container contains therein a radionuclide for emitting radioactive rays and a substance for scattering and absorbing the radioactive rays emitted from the substance so as to obtain polychromatic X-rays. The polychromatic X-rays emitted from the substance travel through the X-ray outlet channel and are then made parallel through a Soller slit to be cast upon the sample. A slide door is provided in the channel so as to block the polychromatic X-rays if necessary.

Polychromatic X-ray source for diffraction apparatus using

Steam introduced into a turbine casing from a steam inlet is longitudinally divided and each divided steam portion flows in respective first stages which are disposed on the shaft adjacent to each other. The shaft and a plurality of disks which are manufactured independently are made integral by a thermal shrink. In order to reduce the thermal distortion effects on the shaft caused by keys interconnecting the disks and shaft, first key grooves formed on an outer surface of the shaft and an inner surface of the disks of one first stage and a first key closely disposed in the first key grooves are arranged in symmetry with respect to the center of the shaft, to second key grooves formed on an inner surface of the disk of the other first stage with a second key closely disposed in the second grooves. Other preferred embodiments include dummy grooves and keys to balance the thermal distortion effects of the keys interconnecting the disks and shaft.

Turbine rotorconstructions

Apparatus for applying liquids including a main body and a carrier supporting the main body for movement, the main body having mounted therein conduits and charge-over valves for supplying liquids, and spray nozzles for spraying the liquids in predetermined amounts onto a liquid-absorptive, resilient contacting member to enable the latter to apply the liquids to a surface by sliding rubbing contact therewith as the carrier is actuated or for spraying the liquids directly onto the surface. The liquids absorbed by the contacting member are squeezed therefrom when a surface cleaning operation or a liquid applying operation is completed or any time the contacting member is soiled, by bringing the contacting member into pressing engagement with a liquid receiving pan. The contacting member may be in the form of a cylinder and mounted at a forward end of a hollow shaft rotatably connected to the carrier, so that the contacting member can be brought into rubbing sliding contact with the surface to apply the liquids thereto or can be covered with a movable cover to remove absorbed liquids by centrifugal forces. The conduits for supplying the liquids are connected to tanks containing the liquids and divided into a cleaning liquid feeding system and an applied liquid feeding system, and the change-over valves are capable of switching the apparatus between the two systems. The main body is capable of movement in a three dimensional space determined by the movement of various elements of the carrier in the directions of the X, Y and Z axes.

Liquid applying apparatus

An apparatus for measuring mechanical stress in one direction (along the x-axis) in the surface of a sample, using white X-rays, wherein white X-rays are cast onto the surface of the sample from on one side of the plane (z-x plane) containing the white X-rays cast position on the surface of the sample, being perpendicular to the surface (x-y plane) of the sample and extending in the direction (along x-axis) along which the stress is measured; the energy of the X-rays diffracted by the lattice planes parallel to the surface of the sample, is detected at a predetermined Bragg angle while the energy of the X-rays diffracted by the lattice planes whose normals are contained in the z-x plane and which incline at an angle with respect to the surface of the sample, is detected also at the same Bragg angle; and the stress .sigma..sub.x in the x-axis direction in the sample surface is calculated on the basis of the difference between the two energies according to the expression ##EQU1## WHERE E.sub.n1 is the energy of the X-rays diffracted by the lattice planes parallel to the sample surface, E.sub.n2 the energy of the X-rays diffracted by the lattice planes including at an angle to the sample surface, .psi..sub.2 the angle which is made by the normal to the sample plane and the normal to the inclining lattice planes, and K is a constant given by the expression ##EQU2## WHERE E is the Young's modulus, .nu. the Poisson's ratio, and E.sub.n the energy of the X-rays diffracted by the sample when it has no strain therein.

Apparatus for measuring mechanical stress using white X-rays

The present invention is concerned with a thrust support system supporting on a stand the thrust of a rotator of a vertical shaft rotary machine. Said support system comprises a ring-like member for receiving thrust of the rotator, legs disposed at a given distance from and obliquely upwardly of said member, and slanted connecting members for connecting said ring-like member with the leg, and said legs being provided with a movement-preventing member for preventing the legs from moving in the diametral direction. With this arrangement, stresses acting on said respective members are distributed in simple and uniform manner.

Thrust support system for vertical shaft rotary machine

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Hitachi, Japan

Sho Kusumoto