Patents Examined by K. Kevin Mun
  • Patent number: 6289071
    Abstract: The present invention provides a positron source essentially consisting of a carbon member having 18F bound onto the surface thereof, a method of preparing the same, and an automated system for supplying the same. In the present invention, the positron source is prepared by irradiating a solution containing both H218O and a small amount of natural fluorine ions with a beam of charged particles to generate 18F, and then passing an electric current through the solution using a carbon member 40 as an anode to cause to bind the generated 18F onto the surface of the carbon member.
    Type: Grant
    Filed: September 1, 1999
    Date of Patent: September 11, 2001
    Assignee: Riken
    Inventors: Ichiro Fujiwara, Yoshiko Ito, Ren Iwata, Toshio Hyodo, Yasushige Yano, Akira Goto, Yuji Ikegami, Yoshio Nomiya
  • Patent number: 6266386
    Abstract: An apparatus and method are provided for inverting the lower internal assembly of a nuclear reactor. The apparatus includes a frame which is sized to receive the lower internal assembly. The frame supports the lower internal assembly as it is being inverted. The apparatus also includes a spider assembly which fits within the lower internal assembly and provides support for a baffle assembly located therein. The method includes the steps of removing the lower internal assembly from a reactor vessel and rotating the lower internal assembly prior to performing maintenance.
    Type: Grant
    Filed: October 13, 1999
    Date of Patent: July 24, 2001
    Assignee: Westinghouse Electric Company LLC
    Inventors: Raman G. Patel, Robert E. Meuschke, Moshe A. Mahlab, David E. Boyle
  • Patent number: 6246740
    Abstract: A cylindrical thin-wall sleeve including an SiC fiber-reinforced SiC composite material (SiC/SiC), which has a porosity of 40% or less and a wall thickness of 5 mm or less.
    Type: Grant
    Filed: October 14, 1998
    Date of Patent: June 12, 2001
    Assignees: Japan Nuclear Cycle Development Institute, Nippon Carbon Co., Ltd.
    Inventors: Tadashi Maruyama, Shoji Onose, Shiro Mitsuno
  • Patent number: 6246739
    Abstract: Passive aerosol retention apparatus positioned in the connecting vents of a nuclear reactor containment are described. The aerosol retention apparatus minimizes aerosol transport from the lower drywell to the upper drywell of the reactor containment. The retention apparatus includes a substantially cylindrical housing and a flow modulator positioned inside the housing and extending at least partially from a first end to a second end of the housing. The flow modulator includes a helically shaped baffle positioned in the housing so as to be coaxial with the housing. The baffle is coupled at each end to the housing by attachment bars.
    Type: Grant
    Filed: April 14, 1999
    Date of Patent: June 12, 2001
    Assignee: General Electric Company
    Inventors: Shyam Satinder Khorana, Jimmy Frank Galtman
  • Patent number: 6240669
    Abstract: A magazine safety for a firearm comprises a sleeve that is slidably received within a recessed pocket formed the magazine well and urged downward into the pocket by a spring. The sleeve has an upper blocking projection that engages a notch in the trigger bar of the firearm to prevent lateral movement of the trigger bar and a lower engaging projection that extends into the magazine well and engages the magazine once it is fully inserted, thereby lifting the sleeve and its blocking projection free of the notch of the trigger bar. When not lifted by the magazine against the urging of the spring, the blocking projection prevents movement of the trigger bar. Since the trigger bar is incapable of movement, the firearm cannot be fired until a magazine is inserted.
    Type: Grant
    Filed: April 26, 1999
    Date of Patent: June 5, 2001
    Inventors: Frank A Spaniel, Zdenek Prisovsky
  • Patent number: 6230429
    Abstract: A composite tube for a gun barrel consists of: an inner tubular metal liner defining a longitudinal bore axis; a resin matrix material surrounding the liner, the resin matrix material containing a plurality of elongate carbon fibers, the carbon fibers being aligned parallel with the longitudinal bore axis of the liner and under compression along the longitudinal bore axis; a muzzle piece attached to the muzzle end of the barrel; and a breech piece attached to the breech end of the barrel, so that any vibrations transmitted along the longitudinal bore axis of the liner are absorbed by the resin matrix material and so that any vibrations reaching the muzzle piece and breech piece are reflected back into the resin matrix material and thus absorbed.
    Type: Grant
    Filed: June 30, 1999
    Date of Patent: May 15, 2001
    Assignee: Magnum Research, Inc.
    Inventor: David B. Smith
  • Patent number: 6219399
    Abstract: A maintenance of a suppression pool or spent fuel storage pool in a reactor primary containment vessel of a nuclear power plant includes a cleaning step of a water in the suppression pool and a decontamination step of an interior of the suppression pool, and in the maintenance, the coated film applied on an inner surface of a wall portion of the suppression pool is inspected. These cleaning, decontaminating and inspecting steps are performed by divers while maintaining a water level in the suppression pool.
    Type: Grant
    Filed: May 25, 1999
    Date of Patent: April 17, 2001
    Assignees: Kabushiki Kaisha Toshiba, Toshiba Engineering Corporation
    Inventors: Yoshihiro Naruse, Shinichi Hoshino
  • Patent number: 6208704
    Abstract: An apparatus, and method, are disclosed for producing a high specific activity of a radioisotope in a single increment of target material, or sequentially within in-series increments of target material, by exposing a targeted isotope in the target material to a high energy photon beam to isotopically convert the targeted isotope. In particular, this invention is used to produce a high specific activity of Mo99, of at least 1.0 Ci/gm or preferably at least about 10.0 Ci/gm, from Mo100.
    Type: Grant
    Filed: July 15, 1999
    Date of Patent: March 27, 2001
    Assignee: Massachusetts Institute of Technology
    Inventors: Lawrence M. Lidsky, Richard Lanza
  • Patent number: 6192095
    Abstract: Radioactive stents used in angioplasty on sclerotic coronary arteries without the risk of restenosis can be produced by ion injecting 133Xe into the surfaces of stents as a nuclide that has a shorter half-life and emits a smaller maximum energy of &bgr;-rays than 32p Uniform ion injection is accomplished using an apparatus capable of uniform irradiation of the stents with 133Xe ion beams. The source of 133Xe is a nuclear fission product generated from 235U in the fuel rods in nuclear reactor.
    Type: Grant
    Filed: February 19, 1999
    Date of Patent: February 20, 2001
    Assignee: Japan Atomic Energy Research Institute
    Inventors: Toshiaki Sekine, Satoshi Watanabe, Akihiko Osa, Noriko Ishioka, Mitsuo Koizumi, Ryozo Nagai, Akira Hasegawa, Eiichi Okamoto, Akito Miyajima, Keiko Aoyagi, Yoichi Hoshino, Takahiro Yamagishi, Masahiko Kurabayashi
  • Patent number: 6169776
    Abstract: Methods and apparatus for examining a nuclear reactor shroud are described. In one embodiment the inspection apparatus includes a drive system, a mast subassembly, and a scanner subassembly. The drive system includes at least two drive assemblies that engage the shroud top to move the inspection apparatus relative to the shroud. The mast subassembly is coupled to the drive system and includes a roller foot which engages the shroud bottom flange to prevent movement of the inspection apparatus during scanning of the shroud. The scanner subassembly is movably coupled to the mast subassembly and includes a horizontal frame, a scanner carriage having a turntable, a movable plate and a scanner. The scanner subassembly coupled to the mast subassembly provides the scanner with four degrees of motion.
    Type: Grant
    Filed: March 22, 1999
    Date of Patent: January 2, 2001
    Assignee: General Electric Company
    Inventor: James Christopher Collins
  • Patent number: 6163588
    Abstract: A modular differential pressure measuring system for a boiling water nuclear reactor pressure vessel is described. The modular pressure differential system includes a plurality of pressure lines having a plurality of pressure line sections. The system also includes a shroud having at least one replaceable shroud section. Each shroud section includes at least one pressure line section which is configured to connect to and disconnect from corresponding pressure line sections in adjacent shroud sections without welding. Additionally, the system includes a reactor bottom head petal section having a shroud support flange and a plurality of bores defining pressure line sections wherein at least one pressure line section of said bottom head petal is configured to couple with a corresponding pressure line section of an adjacent shroud section. The modular pressure system does not require cutting of the pressure lines or pressure line supports for replacement of the replaceable shroud sections.
    Type: Grant
    Filed: December 23, 1998
    Date of Patent: December 19, 2000
    Assignee: General Electric Company
    Inventors: Jack T. Matsumoto, Alex B. Fife, Gary J. Ballas
  • Patent number: 6151376
    Abstract: The present invention relates to a fuel assembly with a substantially square cross section for a light-water reactor. The light-water reactor comprises a plurality of fuel rods extending between a top tie plate and a bottom tie plate. A fuel rod comprises a cladding tube which surrounds a column with fissionable material. According to one aspect of the invention, at least one fuel rod is provided with an axial gap in the fissionable material. Around this axial gap, the mass of the material is greater than the mass of the material in the main part of the cladding tube.
    Type: Grant
    Filed: February 4, 1999
    Date of Patent: November 21, 2000
    Assignee: ABB AB Atom AB
    Inventors: Olov Nylund, David Schrire
  • Patent number: 6141396
    Abstract: Several unit loading patterns are arranged in the central area of an initial core to which the present invention is applied. The unit loading pattern is composed of one square-shaped unit cell and four cross-shaped control rods 3 which surround the unit cell. The unit cell is composed of one low enrichment fuel assembly 7, two high enrichment fuel assemblies 8 and one high enrichment fuel assembly 9. The low enrichment fuel assemblies 7 of each unit loading pattern adjoin each other and are arranged to constitute the first control cell 2a being square-shaped. The high enrichment fuel assemblies 9, obliquely adjoining the low enrichment fuel assembly 7 in each unit loading pattern, adjoin each other and are arranged to constitute the second control cell 2b being square-shaped.
    Type: Grant
    Filed: March 2, 1999
    Date of Patent: October 31, 2000
    Assignee: Hitachi, Ltd.
    Inventors: Akiko Kanda, Katsumasa Haikawa, Akihiro Yamanaka, Kenmi Narita, Junichi Yamashita, Junichi Koyama
  • Patent number: 6130927
    Abstract: A grid with coolant deflecting channels for used in nuclear fuel assemblies is disclosed. In the grid, two sets of intersecting grid strips are arranged in sets at right angles to each other prior to being encircled by four perimeter strips, thus forming a plurality of four-walled cells individually placing and supporting an elongated fuel rod therein. Each of the grid strips is made up of two narrow sheets which are deformed at a plurality of regularly spaced portions to provide nozzle-type coolant deflecting channels. The channels individually have an upright Y-shaped or reversed Y-shaped configuration capable of so deflecting coolant as to mix low temperature coolant with high temperature coolant. The channels thus form a uniform temperature distribution within a fuel assembly. The channels are so inclined with respect to the axes of the fuel rods as to form wide and linear positioning springs at middle portions thereof.
    Type: Grant
    Filed: December 8, 1998
    Date of Patent: October 10, 2000
    Assignees: Korean Atomic Energy Research Institute, Korea Electric Power Corporation
    Inventors: Heung Seok Kang, Kee Nam Song, Kyung Ho Yoon, Youn Ho Jung, Tae Hyun Chun, Dong Seok Oh, Wang Kee In, Je Geon Bang
  • Patent number: 6125160
    Abstract: The spacer envelope measurement system includes a generally U-shaped fixture having support plates extensible into positions overlying the spacer for supporting the fixture from the spacer. Extensible heads are carried by the fixture for engaging the spacer, followed by the heads of measurement gauges whereby, upon extending the heads into clamping engagement with the spacer along opposite sides thereof, the measurement gauges accurately determine the lateral dimensions of the irradiated spacer. A spacer bar clamp member is pivotal between positions opening the fixture opposite the base leg of the U-shaped fixture, enabling the bundle to reside within the U-shaped opening and a second position closing the opening for aligning the fixture and the bundle. The measurements are taken under water in a nuclear fuel service pool.
    Type: Grant
    Filed: July 26, 1999
    Date of Patent: September 26, 2000
    Assignee: General Electric Company
    Inventors: William B. Gaylord, Charles F. Laing, William C. Peters, David O. Sheppard, David G. Smith, Edward G. Apple, Jr.
  • Patent number: 6101231
    Abstract: The spring force measurement system includes a draw rod standard, an insertion tube and an extension tube, together with a cable received through the tubes connecting the standard and a load cell, in turn connected by the cable to a winch. The draw rod standard is located in the fuel bundle below the spacer having a spring whose spring force is to be measured. By drawing the standard through the spacer cell, the spring force is computed using the measured tension in the connecting cable as the standard is withdrawn and the known values of the coefficient of friction between the spacer spring projection and the draw rod standard and the combined weight of the cable and draw rod standard. The measuring process is repeated for next higher spacers.
    Type: Grant
    Filed: April 2, 1999
    Date of Patent: August 8, 2000
    Assignee: General Electric Company
    Inventors: William B. Gaylord, William C. Peters, Charles F. Lang, David G. Smith, David O. Sheppard, Edward G. Apple, Jr.
  • Patent number: 6097778
    Abstract: A gravity driven suction pump for a nuclear reactor condenser is described. The gravity driven suction pump is utilizes the potential energy of the condenser condensate to move condensible and noncondensible gases through the condenser. The gravity driven suction pump includes a drain line having a venturi section and a suction line extending from the condenser into the venturi section. The venturi section alters the flow velocity of condensate in the throat of the drain line and creates a pressure differential through the suction line to drain the noncondensible gases from the condenser.
    Type: Grant
    Filed: December 18, 1998
    Date of Patent: August 1, 2000
    Assignee: General Electric Company
    Inventor: Yee K. Cheung