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| Number | Title | Issue Date |
| 7873138 | Structure and method for bolting neutron reflector A neutron reflector bolt fastening structure is disclosed in which even upon relaxation in the fastening forces thereof being generated in tie rods for divided stage portions as a result of neutron irradiation, it is possible to press the neutron reflector firmly ag... | 01/18/2011 |
| 7439492 | Nondispersive neutron focusing method beyond the critical angle of mirrors This invention extends the Kirkpatrick-Baez (KB) mirror focusing geometry to allow nondispersive focusing of neutrons with a convergence on a sample much larger than is possible with existing KB optical schemes by establishing an array of at least three mirrors and ... | 10/21/2008 |
| 6882696 | Control rod for boiling water reactor and method for manufacturing the same A tie rod having a cruciform cross section is provided with steps for fixing sheaths at tips of cruciform arms of the tie rod; the tips of each of sheaths are fitted onto the steps of the tie rod, each of the sheaths having a U-shaped cross section; and each of the ... | 04/19/2005 |
| 6674829 | Neutron radiation installation for treatment of cancer A neutron radiation installation for treatment of different types of cancer tumours, comprising a source of neutrons (11), like a nuclear reactor or an accelerator dependent source of radiation, a conventional filter (14) for reducing the radiation energy... | 01/06/2004 |
| 6625248 | Process for the treatment of radioactive graphite A process for the treatment of radioactive graphite which includes the following steps: (i) reacting the radioactive graphite at a temperature in the range of from 250° C. to 900° C. with superheated steam or gases containing water vapor to form hydroge... | 09/23/2003 |
| 5949840 | Neutron guide A neutron guide in which lengths of cylindrical glass tubing have rectangular glass plates properly dimensioned to allow insertion into the cylindrical glass tubing so that a sealed geometrically precise polygonal cross-section is formed in the cylindrica... | 09/07/1999 |
| 5903622 | Accelerator-based neutron source for boron neutron capture therapy (BNCT) and method A source for boron neutron capture therapy (BNCT) comprises a body of photoneutron emitter that includes heavy water and is closely surrounded in heat-imparting relationship by target material; one or more electron linear accelerators for supplying electr... | 05/11/1999 |
| 5703918 | Moderator material for neutrons and use of said material The invention concerns a moderator material used for moderation of high-velocity neutrons, in particular of fission neutrons, to epithermal neutrons. The principal components of the moderator material are aluminum fluoride and aluminum metal, which have b... | 12/30/1997 |
| 5680424 | PWR radial reflector A pressurized water reactor ("PWR") radial reflector fabricated of 20% to 30% cold worked AISI Type 316 stainless steel blocks will experience about 0.14% volumetric swelling at a neutron dose level of about 100 dpa at retirement. The reflector will not b... | 10/21/1997 |
| 5422922 | Fuel assembly and reactor core A fuel assembly and a reactor core using same which are able to increase size of the fuel assembly with ensuring thermal margin and reactor shut down margin. A distance between centers of adjacent fuel assemblies is about 23 cm, which is enlarged about 1.... | 06/06/1995 |
| 5319692 | Nuclear reactor reflector A nuclear reactor reflector is disclosed that comprises a stack of reflector blocks with vertical water flow passages to cool the reflector. The interface between blocks is opposite support points for reactor fuel rods. Water flows between the reflector a... | 06/07/1994 |
| 5196159 | Fast reactor A fast reactor comprises a reactor vessel to be arranged vertically in a reactor building, a reactor vessel upper structure disposed on an upper portion in the reactor vessel, a drum structure suspended from the reactor vessel structure into a central por... | 03/23/1993 |
| 5167912 | Neutron reflecting supermirror structure An improved neutron reflecting supermirror structure comprising a plurality of stacked sets of bilayers of neutron reflecting materials. The improved neutron reflecting supermirror structure is adapted to provide extremely good performance at high inciden... | 12/01/1992 |
| 5149495 | Water rod for nuclear reactor and method for providing and using same Water rod configurations, such as for a boiling water nuclear reactor, are provided. An efficiency parameter is defined which relate to how well-used the sacrificed fuel rod positions are. Four particular water rod configurations are described, which prod... | 09/22/1992 |
| 5124113 | Nuclear reactor with improved efficiency The invention relates to a nuclear reactor with improved efficiency. The nuclear reactor comprises a massive partition (18) of material reflecting high energy neutrons at the circumference of the core (7) of the reactor, two layers (19 and 20) of material abso... | 06/23/1992 |
| 5082621 | Neutron reflecting supermirror structure An improved neutron reflecting supermirror structure comprising a plurality of stacked sets of bilayers of neutron reflecting materials. The improved neutron reflecting supermirror structure is adapted to provide extremely good performance at high inciden... | 01/21/1992 |
| 5051230 | Nuclear reactor of a ball-bed type for batch-wise use of core fuel balls replaced by a new batch at relatively long intervals A ball-bed (pebble-bed) nuclear reactor, instead of having fuel elements more or less continuously withdrawn and new or reconstituted fuel elements more or less continuously reintroduced, is initially partly filled with fuel balls of which two-thirds have... | 09/24/1991 |
| 5032349 | Shutdown of a high temperature reactor A process is provided for the long term shutdown of a high temperature nuclear reactor comprised of a pile of spherical fuel elements in a core by means of a neutron absorbing absorber material wherein the absorber material consisting of spherical absorbe... | 07/16/1991 |
| 5017333 | Multi-region reactor core pebble bed high temperature gas reactor A multi-region reactor core pebble bed high temperature gas reactor comprises a pebble bed reactor core housed within a pressure vessel and charged with spherical fuel. The reactor core is surrounded by a reflector wall comprising a partition wall which p... | 05/21/1991 |
| 5015437 | Graphite core blocks for high temperature gas-cooled reactor A reactor core for a gas-cooled reactor, which core is composed of a plurality of prismatic bodies (2) of graphite containing nuclear fuel and having a top wall, a bottom wall and a plurality of vertically extending side walls, each graphite body (2) bein... | 05/14/1991 |
| 4941159 | Low neutron fluence nuclear reactor internals A new design for nuclear reactor internals resulting in reduced fast neutron leakage to the reactor vessel. The first step of the two-stage process reflects high energy or fast neutrons back into the core, by placement of a reflector made of tungsten, sta... | 07/10/1990 |
| 4849162 | Modular radial neutron reflector Modular neutron reflector assemblies removably insertable into the irregular space in a nuclear reactor between a generally cylindrical array of square fuel assemblies comprising the core and the cylindrical core barrel surrounding the core, include an el... | 07/18/1989 |
| 4830818 | Ceramic installations A gas-cooled high temperature reactor having a core filled with spherical fuel elements is provided comprising a graphite side reflector including at least one nose-like projection comprised of a plurality of graphite nose stones stacked one upon the othe... | 05/16/1989 |
| 4826652 | Low capacity nuclear reactor housed underground in the cavity of a cylindrical pressure vessel A low capacity nuclear reactor with spherical fuel elements laid out in an underground configuration and characterized by a compact structure and the far-reaching elimination of active operating installations, such as a charging apparatus, gas purificatio... | 05/02/1989 |
| 4816212 | Graphite side reflector A high temperature reactor having a reactor core filled with spherical fuel elements is provided comprising a graphite side reflector including at least one nose-like projection protruding radially into the reactor core from said graphite said reflector, ... | 03/28/1989 |
| 4798700 | Ceramic installations A gas-cooled high temperature reactor is provided having a core filled with spherical fuel elements, in combination with a graphite side reflector including at least one nose-like projection protruding radially into the reactor core from said graphite sai... | 01/17/1989 |
| 4783312 | Radial neutron refelector A radial neutron reflector for a water moderated nuclear reactor. The space surrounding the nuclear core is provided with a plurality of side-by-side stacked reflector roads having a square cross-sectional shape. Blocks of reflector material having axial ... | 11/08/1988 |
| 4751043 | Radial neutron reflector A radial neutron reflector is disclosed for a light water nuclear reactor. The irregular space between the core periphery and the core barrel surrounding the core is filled with a structure comprising material other than hydrogen such as zirconia or stain... | 06/14/1988 |
| 4731220 | Neutron reflector Metallic reflector units supported solely by the core barrel substantially fill the annular spaces between the vertically spaced former plates which traverse the irregular space between the fuel assembly array and the core barrel in a pressurized water re... | 03/15/1988 |
| 4728492 | Roof reflector for a small high temperature reactor A roof reflector for a small, high temperature reactor with a hot gas collector space arranged above the roof reflector comprises a side reflector arranged under the roof reflector around a reactor core with a thermal side shield arranged around both the ... | 03/01/1988 |
| 4695423 | Method for loading, operating, and unloading a ball-bed nuclear reactor A ball-bed (pebble-bed) nuclear reactor, instead of having fuel elements e or less continuously withdrawn and new or reconstituted fuel elements more or less continuously reintroducted, is initially partly filled with fuel balls of which two-thirds have ... | 09/22/1987 |
| 4675155 | Roof reflector for a high temperature small reactor A graphite roof reflector for a small, high temperature reactor is arranged under the hot gas collector space and is therefore exposed to high thermal and radiation loads. In order to make possible the satisfactory support over the entire operating life o... | 06/23/1987 |
| 4675150 | Apparatus for neutron-capture tumor therapy A tumorous patient is injected with a compound including an element that accumulates in tumors and that has an isotope which emits an alpha particle in a neutron capture reaction. The patient is positioned in front of a radiation beam that has been filter... | 06/23/1987 |
| 4569820 | Nuclear reactor core and fuel element therefor The present invention relates to a nuclear reactor core and fuel elements therefore. Stackable fuel elements, having the usual coolant holes machined therethrough, are formed with grooves along their vertical extent for alignment with similar grooves on a... | 02/11/1986 |
| 4543232 | Gas cooled high temperature reactor A support structure for a nuclear reactor is disclosed comprising a primary support element connected with the roof of the pressure vessel and a secondary support element joined with the primary support element. The thermal roof shield and the roof reflec... | 09/24/1985 |
| 4314883 | Graphite block having wear zone and load bearing zone for side reflector of high temperature reactor A plurality of graphite blocks forms a side reflector with an area of each block that allows a certain amount of radiation induced wear in a predefined zone facing the core of the reactor and an area separate from the wear zone for carrying the load beari... | 02/09/1982 |
| 4257845 | Mixing and distributing device for gases having high temperature Mixing and distributing device for gases having high temperature includes a multiplicity of polygonal blocks stacked in a plurality of layers above and laterally adjacent one another, the blocks being formed with channels having respective axes disposed a... | 03/24/1981 |
| 4234384 | Support structure for the core of a high capacity gas cooled high temperature reactor Disclosed is a support structure consisting of several layers of prismatic graphite blocks arranged over each other. The layers are constructed as closed units without expansion gaps and the blocks of one layer are keyed together with the blocks of the ad... | 11/18/1980 |
| 4199405 | Side reflector for a high-temperature nuclear reactor The invention relates to a graphite side reflector in block form for a gas-cooled high-temperature nuclear reactor. The blocks of the reflector extend radially continuously through the entire reflector wall thickness and recesses are provided in the inner... | 04/22/1980 |
| 4183785 | Method for positioning moderator structure for the core of a molten-salt reactor The moderator structure is placed within a core space limited by a bottom wall, a top wall and a lateral reflector and is constituted by a stack of prismatic or spherical nodules applied in mutual contact in the three dimensions which prevent relative dis... | 01/15/1980 |
