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Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Inventor:
Hayashi; Eisaku
Address:
Hitachi, JP
No. of patents:
12
Patents:












Patent Number Title Of Patent Date Issued
6639962 Preventive maintenance method and apparatus of a structural member in a reactor pressure vessel October 28, 2003
A preventive maintenance method and apparatus for a structural member in a reactor pressure vessel according to the present invention reduce a tensile residual stress on a surface of the structural member by impinging a water jet from a nozzle onto a plane surface of a deflector to there
6519991 Water jet peening apparatus February 18, 2003
A water jet peening apparatus which can carry out an efficient peening work on a large-diameter cylindrical structure by injecting a jet stream which contains air bubbles caused by cavitation at a low angle of incidence is provided. The apparatus is comprised of a nozzle which introduces
6425276 Water jet peening apparatus July 30, 2002
A water jet peening apparatus which can carry out an efficient peening work on a large-diameter cylindrical structure by injecting a jet stream which contains air bubbles caused by cavitation at a low angle of incidence is provided. The apparatus is comprised of a nozzle which introduces
6345083 Preventive maintenance method and apparatus of a structural member in a reactor pressure vessel February 5, 2002
A preventive maintenance method and apparatus for a structural member in a reactor pressure vessel according to the present invention reduce a tensile residual stress on a surface of the structural member by impinging a water jet from a nozzle onto a plane surface of a deflector to there
6341151 Preventive maintenance method and apparatus of a structural member in a reactor pressure vessel January 22, 2002
A preventive maintenance method and apparatus for a structural member in a reactor pressure vessel according to the present invention reduce a tensile residual stress on a surface of the structural member by impinging a water jet from a nozzle onto a plane surface of a deflector to there
6240155 Preventive maintenance apparatus for structural members in a nuclear pressure vessel May 29, 2001
A method of performing maintenance on a structural member inside a reactor pressure vessel includes lowering an annular guide rail having a second lug until the guide rail rests on an upper flange of a core shroud provided inside the reactor pressure vessel, detachably mounting the s
6058153 Preventive maintenance apparatus for structural members in a nuclear pressure vessel May 2, 2000
A preventive maintenance apparatus for structural members inside a nuclear reactor pressure vessel includes a ring-shaped guide rail having a plurality of lugs which is placed on an upper flange of a core shroud provided inside a reactor pressure vessel. At least some of lugs separat
5977515 Underwater laser processing device including chamber with partitioning wall November 2, 1999
An underwater laser processing system has a laser torch; a laser torch driving mechanism for changing a laser emission position of the laser torch; and a chamber with one end opened to an external environment, which contains the laser torch; wherein a partitioning wall for preventing
5897062 Fluid jet nozzle and stress improving treatment method using the nozzle April 27, 1999
A fluid jet nozzle has a water chamber accommodating therein pressurized fluid, an orifice communicating with the water chamber and contracting the fluid from the water chamber, a throat communicating with the orifice and through which the fluid from the orifice passes, a multiplication
5749384 Method and apparatus for performing preventive maintenance on the bottom portion of a reactor pr May 12, 1998
An apparatus preventive maintenance having a driving mechanism capable of driving a jet nozzle 24 to cause it to travel upward-and-downward, to rotate and to swing is settled on the top of a housing in the bottom portion of a reactor pressure vessel and on a hole for a fuel support p
5553106 Residual stress improving method for members in reactor pressure vessel September 3, 1996
Low temperature water in a low temperature water tank 12 installed outside a reactor pressure vessel 9 is pumped by a high pressure pump 15 and supplied through a conductor 17 under pressure. The supplied water is ejected, as a stream of cold water jet 8, from a nozzle 14 connected to
5516247 Fastening device May 14, 1996
The invention is a fastening device for fastening a plurality of structures using a bolt and a nut. At least two bolts are provided each having a screw portion at one end. At least one nut is provided for each of the bolts. The nut has a flange having a diameter greater than a distance










 
 
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