WebCPC CPC COOPERATIVE PATENT CLASSIFICATION

G21C　NUCLEAR REACTORS (analogue computers therefor G06G 7/54; fusion reactors, hybrid fission-fusion reactors G21B; nuclear explosives G21J)

G21C 1/00 Reactors

G21C 1/02 ・Fast fission reactors, i.e. reactors not using a moderator; {Metal cooled reactors; Fast breeders}

G21C 1/022 ・・{Characterised by the concept and properties of the core}

G21C 1/024 ・・・{where the core is divided in zones with fuel and zones with breeding material}

G21C 1/026 ・・・{Reactors not needing refueling, i.e. reactors of the type breed-and-burn, e.g. travelling or deflagration wave reactors or seed-blanket reactors}

G21C 1/028 ・・{cooled by a pressurised coolant (cooling arrangements G21C 15/00)}

G21C 1/03 ・・cooled by a coolant not essentially pressurised, e.g. pool-type reactors

G21C 1/04 ・Thermal reactors; {Epithermal reactors}

G21C 1/06 ・・Heterogeneous reactors, i.e. in which fuel and moderator are separated

G21C 1/07 ・・・Pebble-bed reactors; Reactors with granular fuel

G21C 1/08 ・・・moderator being highly pressurised, e.g. boiling water reactor, integral super-heat reactor, pressurised water reactor (G21C 1/22 takes precedence)

G21C 1/082 ・・・・{Reactors where the coolant is overheated}

G21C 1/084 ・・・・{Boiling water reactors}

G21C 1/086 ・・・・{Pressurised water reactors}

G21C 1/09 ・・・・Pressure regulating arrangements, i.e. pressurisers

G21C 1/10 ・・・・moderator and coolant being different or separated

G21C 1/12 ・・・・・moderator being solid, e.g. Magnox reactor {gas-graphite reactor}

G21C 1/14 ・・・moderator being substantially not pressurised, e.g. swimming-pool reactor (G21C 1/22 takes precedence)

G21C 1/16 ・・・・moderator and coolant being different or separated, e.g. sodium-graphite reactor {sodium-heavy water reactor, organic coolant-heavy water reactor}

G21C 1/18 ・・・・・coolant being pressurised

G21C 1/20 ・・・・・・moderator being liquid, e.g. pressure-tube reactor {also the construction of the pressure-tubes}

G21C 1/22 ・・・using liquid or gaseous fuel

G21C 1/24 ・・Homogeneous reactors, i.e. in which the fuel and moderator present an effectively homogeneous medium to the neutrons

G21C 1/26 ・・・Single-region reactors

G21C 1/28 ・・・Two-region reactors

G21C 1/30 ・Subcritical reactors; {Experimental reactors with exception of swimming-pool reactors or zero-energy reactors}

G21C 1/303 ・・{Experimental and irradiation arrangements inside the reactor (irradiation loops G21C 1/306; material testing by neutrons G01N 23/005)}

G21C 1/306 ・・{Irradiation loops}

G21C 1/32 ・Integral reactors, i.e. reactors wherein parts functionally associated with the reactor but not essential to the reaction, e.g. heat exchangers, are disposed inside the enclosure with the core (G21C 1/02 to G21C 1/30 take precedence)

G21C 1/322 ・・{wherein the heat exchanger is disposed above the core}

G21C 1/324 ・・{wherein the heat exchanger is disposed beneath the core}

G21C 1/326 ・・{wherein the heat exchanger is disposed next to or beside the core}

G21C 1/328 ・・{wherein the prime mover is also disposed in the vessel}

G21C 3/00 Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements

G21C 3/02 ・Fuel elements {(manufacture thereof G21C 21/02)}

G21C 3/04 ・・Constructional details

G21C 3/041 ・・・{Means for removal of gases from fuel elements}

G21C 3/042 ・・・{Fuel elements comprising casings with a mass of granular fuel with coolant passages through them}

G21C 3/044 ・・・{Fuel elements with porous or capillary structure}

G21C 3/06 ・・・Casings; Jackets

G21C 3/07 ・・・・characterised by their material, e.g. alloys

G21C 3/08 ・・・・provided with external means to promote heat-transfer, e.g. fins, baffles

G21C 3/10 ・・・・End closures; {Means for tight mounting therefor}

G21C 3/105 ・・・・・{Flattened end-closures}

G21C 3/12 ・・・・Means forming part of the element for locating it within the reactor core {means not forming part of the element G21C 5/06}

G21C 3/14 ・・・・Means forming part of the element for inserting it into, or removing it from, the core; Means for coupling adjacent elements, {e.g. to form a stringer}

G21C 3/16 ・・・Details of the construction within the casing

G21C 3/17 ・・・・Means for storage or immobilisation of gases in fuel elements

G21C 3/18 ・・・・Internal spacers or other non-active material within the casing, e.g. compensating for expansion of fuel rods or for compensating excess reactivity (interlayers G21C 3/20)

G21C 3/20 ・・・・with coating on fuel or on inside of casing; with non-active interlayer between casing and active material {with multiple casings or multiple active layers}

G21C 3/22 ・・with fissile or breeder material in contact with coolant

G21C 3/24 ・・with fissile or breeder material in fluid form within a non-active casing

G21C 3/26 ・・with fissile or breeder material in powder form within a non-active casing

G21C 3/28 ・・with fissile or breeder material in solid form within a non-active casing

G21C 3/30 ・Assemblies of a number of fuel elements in the form of a rigid unit

G21C 3/32 ・・Bundles of parallel pin-, rod-, or tube-shaped fuel elements

G21C 3/3206 ・・・{Means associated with the fuel bundle for filtering the coolant, e.g. nozzles, grids}

G21C 3/3213 ・・・{Means for the storage or removal of fission gases (means for the storage of fission gases in the elements G21C 3/16; means for the removal of fission gases from elements G21C 3/04)}

G21C 3/322 ・・・Means to influence the coolant flow through or around the bundles

G21C 3/324 ・・・Coats or envelopes for the bundles

G21C 3/3245 ・・・・{made of moderator material}

G21C 3/326 ・・・comprising fuel elements of different composition; comprising, in addition to the fuel elements, other pin-, rod-, or tube-shaped elements, e.g. control rods, grid support rods, fertile rods, poison rods or dummy rods

G21C 3/328 ・・・・Relative disposition of the elements in the bundle lattice

G21C 3/33 ・・・Supporting or hanging of elements in the bundle (spacer grids G21C 3/34); Means forming part of the bundle for inserting it into, or removing it from, the core; Means for coupling adjacent bundles

G21C 3/3305 ・・・・{Lower nozzle}

G21C 3/331 ・・・・{Comprising hold-down means, e.g. springs}

G21C 3/3315 ・・・・{Upper nozzle}

G21C 3/332 ・・・・Supports for spacer grids

G21C 3/334 ・・・Assembling {, maintenance or repair of} the bundles {(assembling, maintenance or repair of other reactor components G21C 19/207)}

G21C 3/335 ・・・Exchanging elements in irradiated bundles

G21C 3/336 ・・・Spacer elements for fuel rods in the bundle (spacer grids G21C 3/34)

G21C 3/338 ・・・・Helicoidal spacer elements

G21C 3/34 ・・・Spacer grids

G21C 3/3408 ・・・・{Compact spacer grids, e.g. made of a plate or a blade}

G21C 3/3416 ・・・・{Spacer grids formed by metallic wires, e.g. springs}

G21C 3/3424 ・・・・{Fabrication of spacer grids}

G21C 3/344 ・・・・formed of assembled tubular elements

G21C 3/348 ・・・・formed of assembled non-intersecting strips

G21C 3/352 ・・・・formed of assembled intersecting strips

G21C 3/356 ・・・・being provided with fuel element supporting members

G21C 3/3563 ・・・・・{Supporting members formed only by deformations in the strips}

G21C 3/3566 ・・・・・{Supporting members formed only of elements fixed on the strips}

G21C 3/36 ・・Assemblies of plate-shaped fuel elements or coaxial tubes

G21C 3/38 ・Fuel units consisting of a single fuel element in a supporting sleeve {or in another supporting element}

G21C 3/40 ・Structural combination of fuel element with thermoelectric element for direct production of electric energy from fission heat (for temperature measurement G21C 17/10){or with another arrangement for direct production of electric energy, e.g. a thermionic device (combination with thermoelements for temperature measurements G21C 17/102)}

G21C 3/42 ・Selection of substances for use as reactor fuel

G21C 3/44 ・・Fluid or fluent reactor fuel

G21C 3/46 ・・・Aqueous compositions

G21C 3/48 ・・・・True or colloidal solutions of the active constituent

G21C 3/50 ・・・・Suspensions of the active constituent; Slurries

G21C 3/52 ・・・Liquid metal compositions

G21C 3/54 ・・・Fused salt, oxide or hydroxide compositions

G21C 3/56 ・・・Gaseous compositions; Suspensions in a gaseous carrier

G21C 3/58 ・・Solid reactor fuel {Pellets made of fissile material}

G21C 3/60 ・・・Metallic fuel; Intermetallic dispersions

G21C 3/62 ・・・Ceramic fuel

G21C 3/623 ・・・・{Oxide fuels}

G21C 3/626 ・・・・{Coated fuel particles}

G21C 3/64 ・・・・Ceramic dispersion fuel, e.g. cermet

G21C 5/00 Moderator or core structure; Selection of materials for use as moderator

G21C 5/02 ・Details

G21C 5/04 ・・Spatial arrangements allowing for Wigner growth

G21C 5/06 ・・Means for locating or supporting fuel elements {(means forming part of the element G21C 3/12)}

G21C 5/08 ・・Means for preventing undesired asymmetric expansion of the complete structure; {Stretching devices, pins}

G21C 5/10 ・・Means for supporting the complete structure {(arrangements for supporting vessels and core-structures G21C 13/024)}

G21C 5/12 ・characterised by composition, e.g. the moderator containing additional substances which ensure improved heat resistance of the moderator {(purification of fluid moderators during the operation of the reactor G21C 19/30)}

G21C 5/123 ・・{Moderators made of organic materials}

G21C 5/126 ・・{Carbonic moderators (carbon and graphite in general C01B 31/00; refractory carbon-bulbs C04B 35/00; carbon electrodes C25B)}

G21C 5/14 ・characterised by shape

G21C 5/16 ・・Shape of its constituent parts

G21C 5/18 ・characterised by the provision of more than one active zone

G21C 5/20 ・・wherein one zone contains fissile material and another zone contains breeder material

G21C 5/22 ・・wherein one zone is a superheating zone

G21C 7/00 Control of nuclear reaction

G21C 7/005 ・{Flux flattening}

G21C 7/02 ・by using self-regulating properties of reactor materials, {e.g. Doppler effect}(arrangements that involve temperature stability G21C 7/32)

G21C 7/04 ・・of burnable poisons (burnable poisons in fuel rods G21C 3/326)

G21C 7/06 ・by application of neutron-absorbing material, i.e. material with absorption cross-section very much in excess of reflection cross-section

G21C 7/08 ・・by displacement of solid control elements, e.g. control rods

G21C 7/10 ・・・Construction of control elements

G21C 7/103 ・・・・Control assemblies containing one or more absorbants as well as other elements, e.g. fuel or moderator elements

G21C 7/107 ・・・・Control elements adapted for pebble-bed reactors

G21C 7/11 ・・・・Deformable control elements, e.g. flexible, telescopic, articulated

G21C 7/113 ・・・・Control elements made of flat elements; Control elements having cruciform cross-section

G21C 7/117 ・・・・Clusters of control rods; Spider construction

G21C 7/12 ・・・Means for moving control elements to desired position (dropping rods in an emergency G21C 9/02)

G21C 7/14 ・・・・Mechanical drive arrangements

G21C 7/16 ・・・・Hydraulic or pneumatic drive

G21C 7/18 ・・・Means for obtaining differential movement of control elements

G21C 7/20 ・・・Disposition of shock-absorbing devices (shock-absorbers in general F16F){Braking arrangements}

G21C 7/22 ・・by displacement of a fluid or fluent neutron-absorbing material, {e.g. by adding neutron-absorbing material to the coolant}

G21C 7/24 ・・Selection of substances for use as neutron-absorbing material

G21C 7/26 ・by displacement of the moderator or parts thereof {by changing the moderator concentration}

G21C 7/27 ・・Spectral shift control

G21C 7/28 ・by displacement of the reflector or parts thereof

G21C 7/30 ・by displacement of the reactor fuel or fuel elements

G21C 7/32 ・by varying flow of coolant through the core {by adjusting the coolant or moderator temperature}

G21C 7/34 ・by utilisation of a primary neutron source

G21C 7/36 ・Control circuits

G21C 9/00 Emergency protection arrangements structurally associated with the reactor {e.g. safety valves provided with pressure equalisation devices}(emergency cooling arrangements G21C 15/18)

G21C 9/001 ・{against explosions e.g. blast shields}

G21C 9/002 ・{against Na- or Ka- reactions}

G21C 9/004 ・Pressure suppression

G21C 9/008 ・・by rupture-discs or -diaphragms

G21C 9/012 ・・by thermal accumulation or by steam condensation, e.g. ice condensers

G21C 9/016 ・Core catchers

G21C 9/02 ・Means for effecting very rapid reduction of the reactivity factor under fault conditions, e.g. reactor fuse; {Control elements having arrangements activated in an emergency}(control elements per se G21C 7/00)

G21C 9/022 ・・{Reactor fuses}

G21C 9/024 ・・{Rupture diaphragms}

G21C 9/027 ・・by fast movement of a solid, e.g. pebbles

G21C 9/033 ・・by an absorbent fluid

G21C 9/04 ・Means for suppressing fires {Earthquake protection}

G21C 9/06 ・・Means for preventing accumulation of explosives gases, e.g. recombiners

G21C 11/00 Shielding structurally associated with the reactor

G21C 11/02 ・Biological shielding (in general G21F){Neutron or gamma shielding}

G21C 11/022 ・・{inside the reactor vessel}

G21C 11/024 ・・・{structurally combined with the casing}

G21C 11/026 ・・{in apertures or channels through a wall}

G21C 11/028 ・・{characterised by the form or by the material}

G21C 11/04 ・・on waterborne craft

G21C 11/06 ・Reflecting shields, i.e. for minimising loss of neutrons

G21C 11/08 ・Thermal shields; Thermal linings, i.e. for dissipating heat from gamma radiation which would otherwise heat an outer biological shield {Thermal insulation}

G21C 11/081 ・・{consisting of a non-metallic layer of insulating material}

G21C 11/083 ・・{consisting of one or more metallic layers}

G21C 11/085 ・・・{consisting exclusively of several metallic layers}

G21C 11/086 ・・{consisting of a combination of non-metallic and metallic layers, e.g. metal-sand-metal-concrete}

G21C 11/088 ・・{consisting of a stagnant or a circulating fluid}

G21C 13/00 Pressure vessels; Containment vessels; Containment in general (for chemical or physical processes B01J 3/00; pressure vessels in general F16J 12/00)

G21C 13/02 ・Details

G21C 13/022 ・・{Ventilating arrangements}

G21C 13/024 ・・Supporting constructions for pressure vessels or containment vessels

G21C 13/028 ・・Seals, e.g. for pressure vessels or containment vessels

G21C 13/0285 ・・・{for container apertures}

G21C 13/032 ・・Joints between tubes and vessel walls, e.g. taking into account thermal stresses

G21C 13/036 ・・・the tube passing through the vessel wall, i.e. continuing on both sides of the wall

G21C 13/04 ・・Arrangements for expansion and contraction

G21C 13/06 ・・Sealing-plugs (for pressure vessels in general F16J 13/00)

G21C 13/067 ・・・for tubes, e.g. standpipes; Locking devices for plugs

G21C 13/0675 ・・・・{Seals for the plugs}

G21C 13/073 ・・・Closures for reactor-vessels, e.g. rotatable

G21C 13/0735 ・・・・{Seals for closures or for rotatable closures}

G21C 13/08 ・Vessels characterised by the material; Selection of materials for pressure vessels

G21C 13/087 ・・Metallic vessels

G21C 13/0875 ・・・{Tube-type vessels, e.g. for not essentially pressurised coolants}

G21C 13/093 ・・Concrete vessels

G21C 13/0933 ・・・{made of prestressed concrete}

G21C 13/0936 ・・・・{Particulars concerning prestressing devices and cables}

G21C 13/10 ・Means for preventing contamination in the event of leakage, {e.g. double wall}

G21C 15/00 Cooling arrangements within the pressure vessel containing the core; Selection of specific coolants

G21C 15/02 ・Arrangements or disposition of passages in which heat is transferred to the coolant; {Coolant flow control devices (G21C 19/04 takes precedence; coolant flow control through fuel assemblies, e.g. flow restrictors G21C 3/322)}

G21C 15/04 ・・from fissile or breeder material {(G21C 3/32 takes precedence)}

G21C 15/06 ・・・in fuel elements

G21C 15/08 ・・from moderating material

G21C 15/10 ・・from reflector or thermal shield

G21C 15/12 ・・from pressure vessel; from containment vessel

G21C 15/14 ・・from headers; from joints in ducts

G21C 15/16 ・comprising means for separating liquid and steam (separating in general B01D; steam traps F16D)

G21C 15/18 ・Emergency cooling arrangements; Removing shut-down heat

G21C 15/182 ・・{comprising powered means, e.g. pumps}

G21C 15/20 ・Partitions or thermal insulation between fuel channel and moderator

G21C 15/22 ・Structural association of coolant tubes with headers (joints of tubes in general F16L)

G21C 15/24 ・Promoting flow of the coolant (electrodynamic pumps H02K 44/02)

G21C 15/243 ・・for liquids

G21C 15/247 ・・・for liquid metals

G21C 15/25 ・・・using jet pumps

G21C 15/253 ・・for gases, e.g. blowers

G21C 15/257 ・・using heat-pipes {(in general F28D, F28F)}

G21C 15/26 ・・by convection, e.g. using chimneys, using divergent channels

G21C 15/28 ・Selection of specific coolants (if serving as the moderator G21C 5/12; compositions per se C09K 5/00; {organic coolants G21C 5/123}); {Additions to the reactor coolants, e.g. against moderator corrosion (purification and regeneration of the reactor coolants G21C 19/30)}

G21C 17/00 Monitoring; Testing (measuring in general G01); {Maintaining}

G21C 17/001 ・{Mechanical simulators (electrical or magnetic simulators G06G 7/54)}

G21C 17/002 ・{Detection of leaks (by testing the coolant or the moderator G21C 17/04)}

G21C 17/003 ・Remote inspection of vessels, e.g. pressure vessels

G21C 17/007 ・・Inspection of the outer surfaces of vessels

G21C 17/01 ・・Inspection of the inner surfaces of vessels

G21C 17/013 ・・Inspection vehicles

G21C 17/017 ・Inspection or maintenance of pipe-lines or tubes in nuclear installations

G21C 17/02 ・Devices or arrangements for monitoring coolant or moderator

G21C 17/021 ・・{Solid moderators testing, e.g. graphite}

G21C 17/022 ・・for monitoring liquid coolants or moderators

G21C 17/0225 ・・・{Chemical surface treatment, e.g. corrosion (corrosion prevention in presence of water from scale removal or by modification of the properties of the liquid C02F 5/00; inhibiting corrosion by adding corrosion inhibitors C23F 11/00)}

G21C 17/025 ・・・for monitoring liquid metal coolants {(molten metal sampling in general G01N 1/125)}

G21C 17/0255 ・・・・{Liquid metal leaks detection (detecting leaks in pipe-line systems in general F17D 5/00)}

G21C 17/028 ・・for monitoring gaseous coolants

G21C 17/032 ・・Reactor-coolant flow measuring or monitoring {(measuring volume or mass flow in general G01F)}

G21C 17/035 ・・Moderator- or coolant-level detecting devices {(indicating or measuring liquid level in general G01F 23/00)}

G21C 17/038 ・・Boiling detection in moderator or coolant

G21C 17/04 ・・Detecting burst slugs

G21C 17/041 ・・・{characterised by systems for checking the coolant channels, e.g. matrix systems}

G21C 17/042 ・・・{Devices for selective sampling, e.g. valves, shutters, rotatable selector valves}

G21C 17/044 ・・・{Detectors and metering devices for the detection of fission products}

G21C 17/045 ・・・・{Precipitation chambers}

G21C 17/047 ・・・・{Detection and metering circuits}

G21C 17/048 ・・・{characterised by a special construction of fuel elements, e.g. by a confined

G21C 17/06 ・Devices or arrangements for monitoring or testing fuel or fuel elements outside the reactor core, e.g. for burn-up, for contamination (G21C 17/08, G21C 17/10 take precedence; detecting leaking fuel elements during reactor operation G21C 17/04)

G21C 17/063 ・・{Burn-up control (G21C 17/066 takes precedence)}

G21C 17/066 ・・{Control of spherical elements}

G21C 17/07 ・・Leak testing

G21C 17/08 ・Structural combination of reactor core or moderator structure with viewing means, e.g. with television camera, periscope, window

G21C 17/10 ・Structural combination of fuel element, control rod, reactor core, or moderator structure with sensitive instruments, e.g. for measuring radioactivity, strain

G21C 17/102 ・・{the sensitive element being part of a fuel element or a fuel assembly (structural combination with a thermoelectric element for direct production of electrical energy G21C 3/40)}

G21C 17/104 ・・Measuring reactivity

G21C 17/108 ・・Measuring reactor flux

G21C 17/112 ・・Measuring temperature

G21C 17/116 ・・Passages or insulators, e.g. for electric cables

G21C 17/12 ・・Sensitive element forming part of control element

G21C 17/14 ・Period meters

G21C 19/00 Arrangements for treating, for handling, or for facilitating the handling of, fuel or other materials which are used within the reactor, e.g. within its pressure vessel

G21C 19/02 ・Details of handling arrangements

G21C 19/04 ・・Means for controlling flow of coolant over objects being handled; Means for controlling flow of coolant through channel being serviced, {e.g. for preventing

G21C 19/06 ・・Magazines for holding fuel elements or control elements

G21C 19/065 ・・・{Rotatable magazines}

G21C 19/07 ・・・Storage racks; Storage pools

G21C 19/08 ・・Means for heating fuel elements before introduction into the core; Means for heating or cooling fuel elements after removal from the core

G21C 19/10 ・・Lifting devices or pulling devices adapted for co-operation with fuel elements or with control elements (manipulators B25J)

G21C 19/105 ・・・with grasping or spreading coupling elements

G21C 19/11 ・・・with revolving coupling elements, e.g. socket coupling

G21C 19/115 ・・・with latching devices and ball couplings

G21C 19/12 ・・Arrangements for exerting direct hydraulic or pneumatic force on fuel element or on control element

G21C 19/14 ・characterised by their adaptation for use with horizontal channels in the reactor core

G21C 19/16 ・Articulated or telescopic chutes or tubes for connection to channels in the reactor core

G21C 19/18 ・Apparatus for bringing fuel elements to the reactor charge area, e.g. from a storage place

G21C 19/19 ・Reactor parts specifically adapted to facilitate handling, e.g. to facilitate charging or discharging of fuel elements

G21C 19/20 ・Arrangements for introducing objects into the pressure vessel; Arrangements for handling objects within the pressure vessel; Arrangements for removing objects from the pressure vessel

G21C 19/202 ・・{Arrangements for handling ball-form, i.e. pebble fuel}

G21C 19/205 ・・{Interchanging of fuel elements in the core, i.e. fuel shuffling}

G21C 19/207 ・・{Assembling, maintenance or repair of reactor components (G21C 3/334 takes precedence)}

G21C 19/22 ・・Arrangements for obtaining access to the interior of a pressure vessel whilst the reactor is operating

G21C 19/24 ・・・by using an auxiliary vessel which is temporarily sealed to the pressure vessel

G21C 19/26 ・Arrangements for removing jammed or damaged fuel elements or control elements; Arrangements for moving broken parts thereof

G21C 19/28 ・Arrangements for introducing fluent material into the reactor core; Arrangements for removing fluent material from the reactor core (pumping coolant G21D)

G21C 19/30 ・・with continuous purification of circulating fluent material, e.g. by extraction of fission products {deterioration or corrosion products, impurities, e.g. by cold traps (purification of circulating fluid fuels G21C 19/50; separation in general B01D)}

G21C 19/303 ・・・specially adapted for gases (decontamination of gases G21F 9/02)

G21C 19/307 ・・・specially adapted for liquids (decontamination of liquids G21F 9/04)

G21C 19/31 ・・・・for molten metals

G21C 19/313 ・・・・・using cold traps

G21C 19/317 ・・・Recombination devices for radiolytic dissociation products

G21C 19/32 ・Apparatus for removing radioactive objects or materials from the reactor discharge area, e.g. to a storage place; Apparatus for handling radioactive objects or materials within a storage place or removing them therefrom (disposal of waste material G21F 9/00)

G21C 19/34 ・Apparatus or processes for dismantling nuclear fuel, e.g. before reprocessing; {Apparatus or processes for dismantling strings of spent fuel elements}(shielded cells G21F 7/00)

G21C 19/36 ・・Mechanical means only

G21C 19/365 ・・・Removing cannings or casings from fuel

G21C 19/37 ・・・・by separating into pieces both the canning or the casing and the fuel element, e.g. by cutting or shearing

G21C 19/375 ・・・Compacting devices, e.g. for fuel assemblies

G21C 19/38 ・・Chemical means only

G21C 19/40 ・Arrangements for preventing occurrence of critical conditions, e.g. during storage

G21C 19/42 ・Reprocessing of irradiated fuel

G21C 19/44 ・・of irradiated solid fuel

G21C 19/46 ・・・Aqueous processes, {e.g. by using organic extraction means, including the regeneration of these means}

G21C 19/48 ・・・Non-aqueous processes

G21C 19/50 ・・of irradiated fluid fuel, {e.g. regeneration of fuels while the reactor is in operation}

G21C 21/00 Apparatus or processes specially adapted to the manufacture of reactors or parts thereof (in general section B, e.g. B23)

G21C 21/02 ・Manufacture of fuel elements or breeder elements contained in non-active casings

G21C 21/04 ・・by vibrational compaction or tamping {of fuel in the jacket}

G21C 21/06 ・・by {rotatable} swaging {of the jacket around the fuel}

G21C 21/08 ・・by a slip-fit cladding process {by crimping the jacket around the fuel}

G21C 21/10 ・・by extrusion, drawing, or stretching {by rolling, e.g. "picture frame" technique}

G21C 21/12 ・・by hydrostatic or thermo-pneumatic canning {in general by pressing without lengthening, e.g. explosive coating}

G21C 21/14 ・・by plating {the fuel} in a fluid

G21C 21/16 ・・by casting or dipping techniques

G21C 21/18 ・・Manufacture of control elements covered by group G21C 7/00

G21C 23/00 Adaptations of reactors to facilitate experimentation or irradiation

G21C 2001/00 Reactors

G21C 2001/04 ・Thermal reactors; {Epithermal reactors}

G21C 2001/06 ・・Heterogeneous reactors, i.e. in which fuel and moderator are separated

G21C 2001/08 ・・・moderator being highly pressurised, e.g. boiling water reactor, integral super-heat reactor, pressurised water reactor (G21C 1/22 takes precedence)

G21C 2001/088 ・・・・Inherently safe boiling water reactors

G21C 2003/00 Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements

G21C 2003/02 ・Fuel elements {(manufacture thereof G21C 21/02)}

G21C 2003/04 ・・Constructional details

G21C 2003/045 ・・・Pellets

G21C 2003/047 ・・・・Pellet-clad interaction

G21C 2003/048 ・・・・Shape of pellets

G21C 2003/30 ・Assemblies of a number of fuel elements in the form of a rigid unit

G21C 2003/32 ・・Bundles of parallel pin-, rod-, or tube-shaped fuel elements

G21C 2003/322 ・・・Means to influence the coolant flow through or around the bundles

G21C 2003/3225 ・・・・by waterrods

G21C 2003/326 ・・・comprising fuel elements of different composition; comprising, in addition to the fuel elements, other pin-, rod-, or tube-shaped elements, e.g. control rods, grid support rods, fertile rods, poison rods or dummy rods

G21C 2003/3262 ・・・・Enrichment distribution in zones

G21C 2003/3265 ・・・・・Radial distribution

G21C 2003/3267 ・・・・・Axial distribution

G21C 2003/34 ・・・Spacer grids

G21C 2003/3432 ・・・・Grids designed to influence the coolant, i.e. coolant mixing function

G21C 2013/00 Pressure vessels; Containment vessels; Containment in general (for chemical or physical processes B01J 3/00; pressure vessels in general F16J 12/00)

G21C 2013/02 ・Details

G21C 2013/06 ・・Sealing-plugs (for pressure vessels in general F16J 13/00)

G21C 2013/063 ・・・Seals for closures or for rotatable closures

G21C 2015/00 Cooling arrangements within the pressure vessel containing the core; Selection of specific coolants

G21C 2015/18 ・Emergency cooling arrangements; Removing shut-down heat

G21C 2015/182 ・・{comprising powered means, e.g. pumps}

G21C 2015/185 ・・・using energy stored in reactor system

G21C 2015/187 ・・・using energy from the electric grid