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Outline
Indent Level
Color Curly Brackets (indicating CPC extensions to IPC)

CPC
COOPERATIVE PATENT CLASSIFICATION
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NUCLEAR REACTORS (analogue computers therefor G06G 7/54; fusion reactors, hybrid fission-fusion reactors G21B; nuclear explosives G21J)
WARNING
-

The following IPC groups are not used in the CPC scheme:
- G21C1/01 covered by all other groups of G21C
- G21C19/33 covered by all other subgroups of G21C 19/34

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Reactors
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G21C 1/02
.
Fast fission reactors, i.e. reactors not using a moderator;
{
Metal cooled reactors; Fast breeders
}
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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
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G21C 1/04
.
Thermal reactors;
{
Epithermal reactors
}
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G21C 1/06
. .
Heterogeneous reactors, i.e. in which fuel and moderator are separated
G21C 1/07
. . .
Pebble-bed reactors; Reactors with granular fuel
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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 2001/088
. . . .
{
Inherently safe boiling water reactors
}
G21C 1/09
. . . .
Pressure regulating arrangements, i.e. pressurisers
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G21C 1/10
. . . .
moderator and coolant being different or separated
G21C 1/12
. . . . .
moderator being solid, e.g. Magnox reactor
{
gas-graphite reactor
}
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G21C 1/14
. . .
moderator being substantially not pressurised, e.g. swimming-pool reactor (G21C 1/22 takes precedence)
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G21C 1/16
. . . .
moderator and coolant being different or separated, e.g. sodium-graphite reactor
{
sodium-heavy water reactor, organic coolant-heavy water reactor
}
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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
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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
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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
}
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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
}
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Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements
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G21C 3/02
.
Fuel elements
{
(manufacture thereof G21C 21/02)
}
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. .
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
}
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G21C 2003/045
. . .
{
Pellets
}
G21C 2003/047
. . . .
{
Pellet-clad interaction
}
G21C 2003/048
. . . .
{
Shape of pellets
}
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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
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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
}
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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
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G21C 3/30
.
Assemblies of a number of fuel elements in the form of a rigid unit
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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)
}
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. . .
Means to influence the coolant flow through or around the bundles
G21C 2003/3225
. . . .
{
by waterrods
}
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G21C 3/324
. . .
Coats or envelopes for the bundles
G21C 3/3245
. . . .
{
made of moderator material
}
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. . .
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
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G21C 2003/3262
. . . .
{
Enrichment distribution in zones
}
G21C 2003/3265
. . . . .
{
Radial distribution
}
G21C 2003/3267
. . . . .
{
Axial distribution
}
G21C 3/328
. . . .
Relative disposition of the elements in the bundle lattice
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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
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G21C 3/336
. . .
Spacer elements for fuel rods in the bundle (spacer grids G21C 3/34)
G21C 3/338
. . . .
Helicoidal spacer elements
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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 2003/3432
. . . .
{
Grids designed to influence the coolant, i.e. coolant mixing function
}
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
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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)
}
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.
Selection of substances for use as reactor fuel
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G21C 3/44
. .
Fluid or fluent reactor fuel
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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
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G21C 3/58
. .
Solid reactor fuel
{
Pellets made of fissile material
}
G21C 3/60
. . .
Metallic fuel; Intermetallic dispersions
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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
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Moderator or core structure; Selection of materials for use as moderator
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G21C 5/02
.
Details
G21C 5/04
. .
Spatial arrangements allowing for Wigner growth
. .
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)
}
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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)
}
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G21C 5/14
.
characterised by shape
G21C 5/16
. .
Shape of its constituent parts
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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
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Control of nuclear reaction
G21C 7/005
.
{
Flux flattening
}
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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)
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G21C 7/06
.
by application of neutron-absorbing material, i.e. material with absorption cross-section very much in excess of reflection cross-section
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G21C 7/08
. .
by displacement of solid control elements, e.g. control rods
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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
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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
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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
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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
}
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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
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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
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G21C 9/04
.
Means for suppressing fires
{
Earthquake protection
}
G21C 9/06
. .
Means for preventing accumulation of explosives gases, e.g. recombiners
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Shielding structurally associated with the reactor
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G21C 11/02
.
Biological shielding (in general G21F)
{
Neutron or gamma shielding
}
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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
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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
}
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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
}
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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)
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G21C 13/02
.
Details
G21C 13/022
. .
{
Ventilating arrangements
}
G21C 13/024
. .
Supporting constructions for pressure vessels or containment vessels
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G21C 13/028
. .
Seals, e.g. for pressure vessels or containment vessels
G21C 13/0285
. . .
{
for container apertures
}
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G21C 13/032
. .
Joints between tubes and vessel walls, e.g. taking into account thermal stresses
. . .
the tube passing through the vessel wall, i.e. continuing on both sides of the wall
G21C 13/04
. .
Arrangements for expansion and contraction
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G21C 13/06
. .
Sealing-plugs (for pressure vessels in general F16J 13/00)
G21C 2013/063
. . .
{
Seals for closures or for rotatable closures
}
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G21C 13/067
. . .
for tubes, e.g. standpipes; Locking devices for plugs
G21C 13/0675
. . . .
{
Seals for the plugs
}
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G21C 13/073
. . .
Closures for reactor-vessels, e.g. rotatable
G21C 13/0735
. . . .
{
Seals for closures or for rotatable closures
}
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G21C 13/08
.
Vessels characterised by the material; Selection of materials for pressure vessels
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G21C 13/087
. .
Metallic vessels
G21C 13/0875
. . .
{
Tube-type vessels, e.g. for not essentially pressurised coolants
}
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G21C 13/093
. .
Concrete vessels
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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
}
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Cooling arrangements within the pressure vessel containing the core; Selection of specific coolants
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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)
}
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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)
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.
Emergency cooling arrangements; Removing shut-down heat
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. .
{
comprising powered means, e.g. pumps
}
G21C 2015/185
. . .
{
using energy stored in reactor system
}
G21C 2015/187
. . .
{
using energy from the electric grid
}
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)
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G21C 15/24
.
Promoting flow of the coolant (electrodynamic pumps H02K 44/02)
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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)
}
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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)
}
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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
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G21C 17/02
.
Devices or arrangements for monitoring coolant or moderator
G21C 17/021
. .
{
Solid moderators testing, e.g. graphite
}
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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)
}
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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
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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
}
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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 "tracer"
}
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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
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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
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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
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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 "blow-out"
}
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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
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. .
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
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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)
}
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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
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G21C 19/28
.
Arrangements for introducing fluent material into the reactor core; Arrangements for removing fluent material from the reactor core (pumping coolant G21D)
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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)
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G21C 19/307
. . .
specially adapted for liquids (decontamination of liquids G21F 9/04)
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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)
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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)
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G21C 19/36
. .
Mechanical means only
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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
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.
Reprocessing of irradiated fuel
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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
}
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Apparatus or processes specially adapted to the manufacture of reactors or parts thereof (in general section B, e.g. B23)
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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
Adaptations of reactors to facilitate experimentation or irradiation
This page is owned by Office of Patent Classification.
Last Modified: 10/10/2013