G21C1/00	7	Reactor types	G21C1/00	G21C1/00		399
G21C1/02	8	Fast fission reactors, i.e. reactors not using a moderator {; Metal cooled reactors; Fast breeders}	G21C1/02	G21C1/02		484
G21C1/022	9	{characterised by the design or properties of the core}	G21C1/02	G21C1/02		106
G21C1/024	10	{where the core is divided in zones with fuel and zones with breeding material}	G21C1/02	G21C1/02		102
G21C1/026	10	{Reactors not needing refuelling, i.e. reactors of the type breed-and-burn, e.g. travelling or deflagration wave reactors or seed-blanket reactors}	G21C1/02	G21C1/02		86
G21C1/028	9	{cooled by a pressurised coolant (cooling arrangements G21C15/00)}	G21C1/02	G21C1/02		47
G21C1/03	9	cooled by a coolant not essentially pressurised, e.g. pool-type reactors	G21C1/03	G21C1/03		382
G21C1/04	8	Thermal reactors {; Epithermal reactors}	G21C1/04	G21C1/04		72
G21C1/06	9	Heterogeneous reactors, i.e. in which fuel and moderator are separated	G21C1/06	G21C1/06		88
G21C1/07	10	Pebble-bed reactors; Reactors with granular fuel	G21C1/07	G21C1/07		370
G21C1/08	10	moderator being highly pressurised, e.g. boiling water reactor, integral super-heat reactor, pressurised water reactor (G21C1/22 takes precedence)	G21C1/08	G21C1/08		461
G21C1/082	11	{Reactors where the coolant is overheated}	G21C1/08	G21C1/08		123
G21C1/084	11	{Boiling water reactors}	G21C1/08	G21C1/08		177
G21C1/086	11	{Pressurised water reactors}	G21C1/08	G21C1/08		212
G21C1/088	11	{Inherently safe boiling water reactors}	G21C1/08	G21C1/08		4
G21C1/09	11	Pressure regulating arrangements, i.e. pressurisers	G21C1/09	G21C1/09		206
G21C1/10	11	moderator and coolant being different or separated	G21C1/10	G21C1/10		38
G21C1/12	12	moderator being solid, e.g. Magnox reactor {or gas-graphite reactor}	G21C1/12	G21C1/12		235
G21C1/14	10	moderator being substantially not pressurised, e.g. swimming-pool reactor (G21C1/22 takes precedence)	G21C1/14	G21C1/14		117
G21C1/16	11	moderator and coolant being different or separated, e.g. sodium-graphite reactor {, sodium-heavy water reactor or organic coolant-heavy water reactor}	G21C1/16	G21C1/16		61
G21C1/18	12	coolant being pressurised	G21C1/18	G21C1/18		45
G21C1/20	13	moderator being liquid, e.g. pressure-tube reactor	G21C1/20	G21C1/20		357
G21C1/22	10	using liquid or gaseous fuel	G21C1/22	G21C1/22		258
G21C1/24	9	Homogeneous reactors, i.e. in which the fuel and moderator present an effectively homogeneous medium to the neutrons	G21C1/24	G21C1/24		102
G21C1/26	10	Single-region reactors	G21C1/26	G21C1/26		46
G21C1/28	10	Two-region reactors	G21C1/28	G21C1/28		37
G21C1/30	8	Subcritical reactors {; Experimental reactors other than swimming-pool reactors or zero-energy reactors}	G21C1/30	G21C1/30		233
G21C1/303	9	{Experimental or irradiation arrangements inside the reactor (irradiation loops G21C1/306)}	G21C1/30	G21C1/30		276
G21C1/306	9	{Irradiation loops}	G21C1/30	G21C1/30		33
G21C1/32	8	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 (G21C1/02&#160;-&#160;G21C1/30 take precedence)	G21C1/32	G21C1/32		439
G21C1/322	9	{wherein the heat exchanger is disposed above the core}	G21C1/32	G21C1/32		274
G21C1/324	9	{wherein the heat exchanger is disposed beneath the core}	G21C1/32	G21C1/32		65
G21C1/326	9	{wherein the heat exchanger is disposed next to or beside the core}	G21C1/32	G21C1/32		227
G21C1/328	9	{wherein the prime mover is also disposed in the vessel}	G21C1/32	G21C1/32		45
G21C3/00	7	Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements	G21C3/00	G21C3/00		154
G21C3/02	8	Fuel elements {(manufacture thereof G21C21/02)}	G21C3/02	G21C3/02		164
G21C3/04	9	Constructional details	G21C3/04	G21C3/04		542
G21C3/041	10	{Means for removal of gases from fuel elements}	G21C3/04	G21C3/04		143
G21C3/042	10	{Fuel elements comprising casings with a mass of granular fuel with coolant passages through them}	G21C3/04	G21C3/04		63
G21C3/044	10	{Fuel elements with porous or capillary structure}	G21C3/04	G21C3/04		66
G21C3/045	10	{Pellets}	G21C3/04	G21C3/04		120
G21C3/047	11	{Pellet-clad interaction}	G21C3/04	G21C3/04		42
G21C3/048	11	{Shape of pellets}	G21C3/04	G21C3/04		33
G21C3/06	10	Casings; Jackets	G21C3/06	G21C3/06		454
G21C3/07	11	characterised by their material, e.g. alloys	G21C3/07	G21C3/07		904
G21C3/08	11	provided with external means to promote heat-transfer, e.g. fins, baffles	G21C3/08	G21C3/08		297
G21C3/10	11	End closures {; Means for tight mounting therefor}	G21C3/10	G21C3/10		396
G21C3/105	12	{Flattened end-closures}	G21C3/10	G21C3/10		7
G21C3/12	11	Means forming part of the element for locating it within the reactor core {(means not forming part of the element G21C5/06)}	G21C3/12	G21C3/12		275
G21C3/14	11	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}	G21C3/14	G21C3/14		165
G21C3/16	10	Details of the construction within the casing	G21C3/16	G21C3/16		426
G21C3/17	11	Means for storage or immobilisation of gases in fuel elements	G21C3/17	G21C3/17		205
G21C3/18	11	Internal spacers or other non-active material within the casing, e.g. compensating for expansion of fuel rods or for compensating excess reactivity (interlayers G21C3/20)	G21C3/18	G21C3/18		339
G21C3/20	11	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}	G21C3/20	G21C3/20		588
G21C3/22	9	with fissile or breeder material in contact with coolant	G21C3/22	G21C3/22		61
G21C3/24	9	with fissile or breeder material in fluid form within a non-active casing	G21C3/24	G21C3/24		54
G21C3/26	9	with fissile or breeder material in powder form within a non-active casing	G21C3/26	G21C3/26		47
G21C3/28	9	with fissile or breeder material in solid form within a non-active casing	G21C3/28	G21C3/28		227
G21C3/30	8	Assemblies of a number of fuel elements in the form of a rigid unit	G21C3/30	G21C3/30		299
G21C3/32	9	Bundles of parallel pin-, rod-, or tube-shaped fuel elements	G21C3/32	G21C3/32		689
G21C3/3206	10	{Means associated with the fuel bundle for filtering the coolant, e.g. nozzles, grids}	G21C3/32	G21C3/32		163
G21C3/3213	10	{Means for the storage or removal of fission gases (means for the storage of fission gases in the elements G21C3/16; means for the removal of fission gases from elements G21C3/04)}	G21C3/32	G21C3/32		59
G21C3/322	10	Means to influence the coolant flow through or around the bundles	G21C3/322	G21C3/322		766
G21C3/3225	11	{by waterrods}	G21C3/322	G21C3/322		38
G21C3/324	10	Coats or envelopes for the bundles	G21C3/324	G21C3/324		203
G21C3/3245	11	{made of moderator material}	G21C3/324	G21C3/324		4
G21C3/326	10	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	G21C3/326	G21C3/326		409
G21C3/3262	11	{Enrichment distribution in zones}	G21C3/326	G21C3/326		13
G21C3/3265	12	{Radial distribution}	G21C3/326	G21C3/326		22
G21C3/3267	12	{Axial distribution}	G21C3/326	G21C3/326		19
G21C3/328	11	Relative disposition of the elements in the bundle lattice	G21C3/328	G21C3/328		290
G21C3/33	10	Supporting or hanging of elements in the bundle (spacer grids G21C3/34); Means forming part of the bundle for inserting it into, or removing it from, the core; Means for coupling adjacent bundles	G21C3/33	G21C3/33		371
G21C3/3305	11	{Lower nozzle}	G21C3/33	G21C3/33		160
G21C3/331	11	{Comprising hold-down means, e.g. springs}	G21C3/33	G21C3/33		99
G21C3/3315	11	{Upper nozzle}	G21C3/33	G21C3/33		140
G21C3/332	11	Supports for spacer grids	G21C3/332	G21C3/332		146
G21C3/334	10	Assembling {, maintenance or repair of} the bundles {(assembling, maintenance or repair of other reactor components G21C19/207)}	G21C3/334	G21C3/334		484
G21C3/335	10	Exchanging elements in irradiated bundles	G21C3/335	G21C3/335		71
G21C3/336	10	Spacer elements for fuel rods in the bundle (spacer grids G21C3/34)	G21C3/336	G21C3/336		90
G21C3/338	11	Helicoidal spacer elements	G21C3/338	G21C3/338		92
G21C3/34	10	Spacer grids	G21C3/34	G21C3/34		365
G21C3/3408	11	{Compact spacer grids, e.g. made of a plate or a blade}	G21C3/34	G21C3/34		38
G21C3/3416	11	{Spacer grids formed by metallic wires, e.g. springs}	G21C3/34	G21C3/34		54
G21C3/3424	11	{Fabrication of spacer grids}	G21C3/34	G21C3/34		157
G21C3/3432	11	{Grids designed to influence the coolant, i.e. coolant mixing function}	G21C3/34	G21C3/34		61
G21C3/344	11	formed of assembled tubular elements	G21C3/344	G21C3/344		146
G21C3/348	11	formed of assembled non-intersecting strips	G21C3/348	G21C3/348		85
G21C3/352	11	formed of assembled intersecting strips	G21C3/352	G21C3/352		220
G21C3/356	11	being provided with fuel element supporting members	G21C3/356	G21C3/356		188
G21C3/3563	12	{Supporting members formed only by deformations in the strips}	G21C3/356	G21C3/356		194
G21C3/3566	12	{Supporting members formed only of elements fixed on the strips}	G21C3/356	G21C3/356		104
G21C3/36	9	Assemblies of plate-shaped fuel elements or coaxial tubes	G21C3/36	G21C3/36		259
G21C3/38	8	Fuel units consisting of a single fuel element in a supporting sleeve {or in another supporting element}	G21C3/38	G21C3/38		112
G21C3/40	8	Structural combination of fuel element with thermoelectric element for direct production of electric energy from fission heat (for temperature measurement G21C17/10){or with another arrangement for direct production of electric energy, e.g. a thermionic device (combination with thermoelements for temperature measurements G21C17/102)}	G21C3/40	G21C3/40		116
G21C3/42	8	Selection of substances for use as reactor fuel	G21C3/42	G21C3/42		88
G21C3/44	9	Fluid or fluent reactor fuel	G21C3/44	G21C3/44		28
G21C3/46	10	Aqueous compositions	G21C3/46	G21C3/46		5
G21C3/48	11	True or colloidal solutions of the active constituent	G21C3/48	G21C3/48		40
G21C3/50	11	Suspensions of the active constituent; Slurries	G21C3/50	G21C3/50		17
G21C3/52	10	Liquid metal compositions	G21C3/52	G21C3/52		54
G21C3/54	10	Fused salt, oxide or hydroxide compositions	G21C3/54	G21C3/54		230
G21C3/56	10	Gaseous compositions; Suspensions in a gaseous carrier	G21C3/56	G21C3/56		15
G21C3/58	9	Solid reactor fuel {Pellets made of fissile material}	G21C3/58	G21C3/58		249
G21C3/60	10	Metallic fuel; Intermetallic dispersions	G21C3/60	G21C3/60		329
G21C3/62	10	Ceramic fuel	G21C3/62	G21C3/62		539
G21C3/623	11	{Oxide fuels}	G21C3/62	G21C3/62		818
G21C3/626	11	{Coated fuel particles}	G21C3/62	G21C3/62		304
G21C3/64	11	Ceramic dispersion fuel, e.g. cermet	G21C3/64	G21C3/64		295
G21C5/00	7	Moderator or core structure; Selection of materials for use as moderator	G21C5/00	G21C5/00		126
G21C5/02	8	Details	G21C5/02	G21C5/02		380
G21C5/04	9	Spatial arrangements allowing for Wigner growth	G21C5/04	G21C5/04		68
G21C5/06	9	Means for locating or supporting fuel elements {(means forming part of the element G21C3/12)}	G21C5/06	G21C5/06		440
G21C5/08	9	Means for preventing undesired asymmetric expansion of the complete structure {; Stretching devices, pins}	G21C5/08	G21C5/08		229
G21C5/10	9	Means for supporting the complete structure {(arrangements for supporting vessels and core-structures G21C13/024)}	G21C5/10	G21C5/10		384
G21C5/12	8	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 G21C19/30)}	G21C5/12	G21C5/12		189
G21C5/123	9	{Moderators made of organic materials}	G21C5/12	G21C5/12		89
G21C5/126	9	{Carbonic moderators (carbon and graphite in general C01B32/00; refractory carbon-bulbs C04B35/00; carbon electrodes C25B)}	G21C5/12	G21C5/12		142
G21C5/14	8	characterised by shape	G21C5/14	G21C5/14		108
G21C5/16	9	Shape of its constituent parts	G21C5/16	G21C5/16		146
G21C5/18	8	characterised by the provision of more than one active zone	G21C5/18	G21C5/18		83
G21C5/20	9	wherein one zone contains fissile material and another zone contains breeder material	G21C5/20	G21C5/20		121
G21C5/22	9	wherein one zone is a superheating zone	G21C5/22	G21C5/22		30
G21C7/00	7	Control of nuclear reaction	G21C7/00	G21C7/00		296
G21C7/005	8	{Flux flattening}	G21C7/00	G21C7/00		112
G21C7/02	8	by using self-regulating properties of reactor materials, {e.g. Doppler effect}(arrangements that involve temperature stability G21C7/32)	G21C7/02	G21C7/02		128
G21C7/04	9	of burnable poisons (burnable poisons in fuel rods G21C3/326)	G21C7/04	G21C7/04		234
G21C7/06	8	by application of neutron-absorbing material, i.e. material with absorption cross-section very much in excess of reflection cross-section	G21C7/06	G21C7/06		170
G21C7/08	9	by displacement of solid control elements, e.g. control rods	G21C7/08	G21C7/08		461
G21C7/10	10	Construction of control elements	G21C7/10	G21C7/10		488
G21C7/103	11	Control assemblies containing one or more absorbants as well as other elements, e.g. fuel or moderator elements	G21C7/103	G21C7/103		105
G21C7/107	11	Control elements adapted for pebble-bed reactors	G21C7/107	G21C7/107		50
G21C7/11	11	Deformable control elements, e.g. flexible, telescopic, articulated	G21C7/11	G21C7/11		69
G21C7/113	11	Control elements made of flat elements; Control elements having cruciform cross-section	G21C7/113	G21C7/113		166
G21C7/117	11	Clusters of control rods; Spider construction	G21C7/117	G21C7/117		163
G21C7/12	10	Means for moving control elements to desired position (dropping rods in an emergency G21C9/02)	G21C7/12	G21C7/12		825
G21C7/14	11	Mechanical drive arrangements	G21C7/14	G21C7/14		495
G21C7/16	11	Hydraulic or pneumatic drive	G21C7/16	G21C7/16		342
G21C7/18	10	Means for obtaining differential movement of control elements	G21C7/18	G21C7/18		68
G21C7/20	10	Disposition of shock-absorbing devices (shock-absorbers in general F16F){; Braking arrangements}	G21C7/20	G21C7/20		204
G21C7/22	9	by displacement of a fluid or fluent neutron-absorbing material {, e.g. by adding neutron-absorbing material to the coolant}	G21C7/22	G21C7/22		271
G21C7/24	9	Selection of substances for use as neutron-absorbing material	G21C7/24	G21C7/24		256
G21C7/26	8	by displacement of the moderator or parts thereof {by changing the moderator concentration}	G21C7/26	G21C7/26		217
G21C7/27	9	Spectral shift control	G21C7/27	G21C7/27		86
G21C7/28	8	by displacement of the reflector or parts thereof	G21C7/28	G21C7/28		150
G21C7/30	8	by displacement of the reactor fuel or fuel elements	G21C7/30	G21C7/30		182
G21C7/32	8	by varying flow of coolant through the core {by adjusting the coolant or moderator temperature}	G21C7/32	G21C7/32		147
G21C7/34	8	by utilisation of a primary neutron source	G21C7/34	G21C7/34		54
G21C7/36	8	Control circuits	G21C7/36	G21C7/36		428
G21C9/00	7	Emergency protection arrangements structurally associated with the reactor {, e.g. safety valves provided with pressure equalisation devices}(emergency cooling arrangements G21C15/18)	G21C9/00	G21C9/00		615
G21C9/001	8	{against explosions, e.g. blast shields}	G21C9/00	G21C9/00		114
G21C9/002	8	{against Na- or Ka- reactions}	G21C9/00	G21C9/00		26
G21C9/004	8	Pressure suppression	G21C9/004	G21C9/004		456
G21C9/008	9	by rupture-discs or -diaphragms	G21C9/008	G21C9/008		82
G21C9/012	9	by thermal accumulation or by steam condensation, e.g. ice condensers	G21C9/012	G21C9/012		301
G21C9/016	8	Core catchers	G21C9/016	G21C9/016		368
G21C9/02	8	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 seG21C7/00)	G21C9/02	G21C9/02		323
G21C9/022	9	{Reactor fuses}	G21C9/02	G21C9/02		43
G21C9/024	9	{Rupture diaphragms}	G21C9/02	G21C9/02		25
G21C9/027	9	by fast movement of a solid, e.g. pebbles	G21C9/027	G21C9/027		170
G21C9/033	9	by an absorbent fluid	G21C9/033	G21C9/033		96
G21C9/04	8	Means for suppressing fires {; Earthquake protection}	G21C9/04	G21C9/04		149
G21C9/06	9	Means for preventing accumulation of explosives gases, e.g. recombiners	G21C9/06	G21C9/06		173
G21C11/00	7	Shielding structurally associated with the reactor	G21C11/00	G21C11/00		99
G21C11/02	8	Biological shielding (in general G21F){; Neutron or gamma shielding}	G21C11/02	G21C11/02		210
G21C11/022	9	{inside the reactor vessel}	G21C11/02	G21C11/02		94
G21C11/024	10	{structurally combined with the casing}	G21C11/02	G21C11/02		27
G21C11/026	9	{in apertures or channels through a wall}	G21C11/02	G21C11/02		50
G21C11/028	9	{characterised by the form or by the material}	G21C11/02	G21C11/02		132
G21C11/04	9	on waterborne craft	G21C11/04	G21C11/04		65
G21C11/06	8	Reflecting shields, i.e. for minimising loss of neutrons	G21C11/06	G21C11/06		284
G21C11/08	8	Thermal shields; Thermal linings, i.e. for dissipating heat from gamma radiation which would otherwise heat an outer biological shield {; Thermal insulation}	G21C11/08	G21C11/08		292
G21C11/081	9	{consisting of a non-metallic layer of insulating material}	G21C11/08	G21C11/08		63
G21C11/083	9	{consisting of one or more metallic layers}	G21C11/08	G21C11/08		51
G21C11/085	10	{consisting exclusively of several metallic layers}	G21C11/08	G21C11/08		141
G21C11/086	9	{consisting of a combination of non-metallic and metallic layers, e.g. metal-sand-metal-concrete}	G21C11/08	G21C11/08		46
G21C11/088	9	{consisting of a stagnant or a circulating fluid}	G21C11/08	G21C11/08		111
G21C13/00	7	Pressure vessels; Containment vessels; Containment in general (for chemical or physical processes B01J3/00; pressure vessels in general F16J12/00)	G21C13/00	G21C13/00		485
G21C13/02	8	Details	G21C13/02	G21C13/02		1086
G21C13/022	9	{Ventilating arrangements}	G21C13/02	G21C13/02		111
G21C13/024	9	Supporting constructions for pressure vessels or containment vessels	G21C13/024	G21C13/024		454
G21C13/028	9	Seals, e.g. for pressure vessels or containment vessels	G21C13/028	G21C13/028		368
G21C13/0285	10	{for container apertures}	G21C13/028	G21C13/028		95
G21C13/032	9	Joints between tubes and vessel walls, e.g. taking into account thermal stresses	G21C13/032	G21C13/032		140
G21C13/036	10	the tube passing through the vessel wall, i.e. continuing on both sides of the wall	G21C13/036	G21C13/036		342
G21C13/04	9	Arrangements for expansion and contraction	G21C13/04	G21C13/04		169
G21C13/06	9	Sealing-plugs (for pressure vessels in general F16J13/00)	G21C13/06	G21C13/06		227
G21C13/063	10	{Seals for closures or for rotatable closures}	G21C13/06	G21C13/06		6
G21C13/067	10	for tubes, e.g. standpipes; Locking devices for plugs	G21C13/067	G21C13/067		191
G21C13/0675	11	{Seals for the plugs}	G21C13/067	G21C13/067		29
G21C13/073	10	Closures for reactor-vessels, e.g. rotatable	G21C13/073	G21C13/073		312
G21C13/0735	11	{Seals for closures or for rotatable closures}	G21C13/073	G21C13/073		87
G21C13/08	8	Vessels characterised by the material; Selection of materials for pressure vessels	G21C13/08	G21C13/08		120
G21C13/087	9	Metallic vessels	G21C13/087	G21C13/087		299
G21C13/0875	10	{Tube-type vessels, e.g. for not essentially pressurised coolants}	G21C13/087	G21C13/087		30
G21C13/093	9	Concrete vessels	G21C13/093	G21C13/093		195
G21C13/0933	10	{made of prestressed concrete}	G21C13/093	G21C13/093		145
G21C13/0936	11	{Particulars concerning prestressing devices and cables}	G21C13/093	G21C13/093		33
G21C13/10	8	Means for preventing contamination in the event of leakage, {e.g. double wall}	G21C13/10	G21C13/10		248
G21C15/00	7	Cooling arrangements within the pressure vessel containing the core; Selection of specific coolants	G21C15/00	G21C15/00		314
G21C15/02	8	Arrangements or disposition of passages in which heat is transferred to the coolant; {Coolant flow control devices (G21C19/04 takes precedence; coolant flow control through fuel assemblies, e.g. flow restrictors G21C3/322)}	G21C15/02	G21C15/02		738
G21C15/04	9	from fissile or breeder material {(G21C3/32 takes precedence)}	G21C15/04	G21C15/04		283
G21C15/06	10	in fuel elements	G21C15/06	G21C15/06		187
G21C15/08	9	from moderating material	G21C15/08	G21C15/08		71
G21C15/10	9	from reflector or thermal shield	G21C15/10	G21C15/10		80
G21C15/12	9	from pressure vessel; from containment vessel	G21C15/12	G21C15/12		547
G21C15/14	9	from headers; from joints in ducts	G21C15/14	G21C15/14		488
G21C15/16	8	comprising means for separating liquid and steam (separating in general B01D; steam traps F16D)	G21C15/16	G21C15/16		221
G21C15/18	8	Emergency cooling arrangements; Removing shut-down heat	G21C15/18	G21C15/18		2239
G21C15/182	9	{comprising powered means, e.g. pumps}	G21C15/18	G21C15/18		460
G21C15/185	10	{using energy stored in reactor system}	G21C15/18	G21C15/18		61
G21C15/187	10	{using energy from the electric grid}	G21C15/18	G21C15/18		13
G21C15/20	8	Partitions or thermal insulation between fuel channel and moderator	G21C15/20	G21C15/20		96
G21C15/22	8	Structural association of coolant tubes with headers (joints of tubes in general F16L)	G21C15/22	G21C15/22		212
G21C15/24	8	Promoting flow of the coolant (electrodynamic pumps H02K44/02)	G21C15/24	G21C15/24		251
G21C15/243	9	for liquids	G21C15/243	G21C15/243		410
G21C15/247	10	for liquid metals	G21C15/247	G21C15/247		207
G21C15/25	10	using jet pumps	G21C15/25	G21C15/25		213
G21C15/253	9	for gases, e.g. blowers	G21C15/253	G21C15/253		165
G21C15/257	9	using heat-pipes {(in general F28D, F28F)}	G21C15/257	G21C15/257		254
G21C15/26	9	by convection, e.g. using chimneys, using divergent channels	G21C15/26	G21C15/26		174
G21C15/28	8	Selection of specific coolants (if serving as the moderator G21C5/12; compositions per seC09K5/00; {organic coolants G21C5/123}); {Additions to the reactor coolants, e.g. against moderator corrosion (purification and regeneration of the reactor coolants G21C19/30)}	G21C15/28	G21C15/28		388
G21C17/00	7	Monitoring; Testing (measuring in general G01); {Maintaining}	G21C17/00	G21C17/00		2002
G21C17/001	8	{Mechanical simulators (electrical or magnetic simulators G06G7/54)}	G21C17/00	G21C17/00		741
G21C17/002	8	{Detection of leaks (by testing the coolant or the moderator G21C17/04)}	G21C17/00	G21C17/00		475
G21C17/003	8	Remote inspection of vessels, e.g. pressure vessels	G21C17/003	G21C17/003		438
G21C17/007	9	Inspection of the outer surfaces of vessels	G21C17/007	G21C17/007		129
G21C17/01	9	Inspection of the inner surfaces of vessels	G21C17/01	G21C17/01		290
G21C17/013	9	Inspection vehicles	G21C17/013	G21C17/013		244
G21C17/017	8	Inspection or maintenance of pipe-lines or tubes in nuclear installations	G21C17/017	G21C17/017		1140
G21C17/02	8	Devices or arrangements for monitoring coolant or moderator	G21C17/02	G21C17/02		254
G21C17/021	9	{Solid moderators testing, e.g. graphite}	G21C17/02	G21C17/02		18
G21C17/022	9	for monitoring liquid coolants or moderators	G21C17/022	G21C17/022		429
G21C17/0225	10	{Chemical surface treatment, e.g. corrosion (corrosion prevention in presence of water from scale removal or by modification of the properties of the liquid C02F5/00; inhibiting corrosion by adding corrosion inhibitors C23F11/00)}	G21C17/022	G21C17/022		207
G21C17/025	10	for monitoring liquid metal coolants {(molten metal sampling in general G01N1/125)}	G21C17/025	G21C17/025		134
G21C17/0255	11	{Liquid metal leaks detection (detecting leaks in pipe-line systems in general F17D5/00)}	G21C17/025	G21C17/025		21
G21C17/028	9	for monitoring gaseous coolants	G21C17/028	G21C17/028		92
G21C17/032	9	Reactor-coolant flow measuring or monitoring {(measuring volume or mass flow in general G01F)}	G21C17/032	G21C17/032		185
G21C17/035	9	Moderator- or coolant-level detecting devices {(indicating or measuring liquid level in general G01F23/00)}	G21C17/035	G21C17/035		182
G21C17/038	9	Boiling detection in moderator or coolant	G21C17/038	G21C17/038		36
G21C17/04	9	Detecting burst slugs	G21C17/04	G21C17/04		279
G21C17/041	10	{characterised by systems for checking the coolant channels, e.g. matrix systems}	G21C17/04	G21C17/04		60
G21C17/042	10	{Devices for selective sampling, e.g. valves, shutters, rotatable selector valves}	G21C17/04	G21C17/04		71
G21C17/044	10	{Detectors and metering devices for the detection of fission products}	G21C17/04	G21C17/04		98
G21C17/045	11	{Precipitation chambers}	G21C17/04	G21C17/04		26
G21C17/047	11	{Detection and metering circuits}	G21C17/04	G21C17/04		52
G21C17/048	10	{characterised by a special construction of fuel elements, e.g. by a confined "tracer"}	G21C17/04	G21C17/04		52
G21C17/06	8	Devices or arrangements for monitoring or testing fuel or fuel elements outside the reactor core, e.g. for burn-up, for contamination (G21C17/08, G21C17/10 take precedence; detecting leaking fuel elements during reactor operation G21C17/04)	G21C17/06	G21C17/06		950
G21C17/063	9	{Burn-up control (G21C17/066 takes precedence)}	G21C17/06	G21C17/06		81
G21C17/066	9	{Control of spherical elements}	G21C17/06	G21C17/06		54
G21C17/07	9	Leak testing	G21C17/07	G21C17/07		227
G21C17/08	8	Structural combination of reactor core or moderator structure with viewing means, e.g. with television camera, periscope, window	G21C17/08	G21C17/08		264
G21C17/10	8	Structural combination of fuel element, control rod, reactor core, or moderator structure with sensitive instruments, e.g. for measuring radioactivity, strain	G21C17/10	G21C17/10		1328
G21C17/102	9	{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 G21C3/40)}	G21C17/10	G21C17/10		181
G21C17/104	9	Measuring reactivity	G21C17/104	G21C17/104		173
G21C17/108	9	Measuring reactor flux	G21C17/108	G21C17/108		735
G21C17/112	9	Measuring temperature	G21C17/112	G21C17/112		484
G21C17/116	9	Passages or insulators, e.g. for electric cables	G21C17/116	G21C17/116		163
G21C17/12	9	Sensitive element forming part of control element	G21C17/12	G21C17/12		266
G21C17/14	8	Period meters	G21C17/14	G21C17/14		83
G21C19/00	7	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	G21C19/00	G21C19/00		387
G21C19/02	8	Details of handling arrangements	G21C19/02	G21C19/02		804
G21C19/04	9	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"}	G21C19/04	G21C19/04		182
G21C19/06	9	Magazines for holding fuel elements or control elements	G21C19/06	G21C19/06		240
G21C19/065	10	{Rotatable magazines}	G21C19/06	G21C19/06		68
G21C19/07	10	Storage racks; Storage pools	G21C19/07	G21C19/07		773
G21C19/08	9	Means for heating fuel elements before introduction into the core; Means for heating or cooling fuel elements after removal from the core	G21C19/08	G21C19/08		112
G21C19/10	9	Lifting devices or pulling devices adapted for co-operation with fuel elements or with control elements (manipulators B25J)	G21C19/10	G21C19/10		588
G21C19/105	10	with grasping or spreading coupling elements	G21C19/105	G21C19/105		438
G21C19/11	10	with revolving coupling elements, e.g. socket coupling	G21C19/11	G21C19/11		69
G21C19/115	10	with latching devices and ball couplings	G21C19/115	G21C19/115		68
G21C19/12	9	Arrangements for exerting direct hydraulic or pneumatic force on fuel element or on control element	G21C19/12	G21C19/12		59
G21C19/14	8	characterised by their adaptation for use with horizontal channels in the reactor core	G21C19/14	G21C19/14		123
G21C19/16	8	Articulated or telescopic chutes or tubes for connection to channels in the reactor core	G21C19/16	G21C19/16		277
G21C19/18	8	Apparatus for bringing fuel elements to the reactor charge area, e.g. from a storage place	G21C19/18	G21C19/18		297
G21C19/19	8	Reactor parts specifically adapted to facilitate handling, e.g. to facilitate charging or discharging of fuel elements	G21C19/19	G21C19/19		308
G21C19/20	8	Arrangements for introducing objects into the pressure vessel; Arrangements for handling objects within the pressure vessel; Arrangements for removing objects from the pressure vessel	G21C19/20	G21C19/20		625
G21C19/202	9	{Arrangements for handling ball-form, i.e. pebble fuel}	G21C19/20	G21C19/20		186
G21C19/205	9	{Interchanging of fuel elements in the core, i.e. fuel shuffling}	G21C19/20	G21C19/20		209
G21C19/207	9	{Assembling, maintenance or repair of reactor components (G21C3/334 takes precedence)}	G21C19/20	G21C19/20		604
G21C19/22	9	Arrangements for obtaining access to the interior of a pressure vessel whilst the reactor is operating	G21C19/22	G21C19/22		84
G21C19/24	10	by using an auxiliary vessel which is temporarily sealed to the pressure vessel	G21C19/24	G21C19/24		36
G21C19/26	8	Arrangements for removing jammed or damaged fuel elements or control elements; Arrangements for moving broken parts thereof	G21C19/26	G21C19/26		145
G21C19/28	8	Arrangements for introducing fluent material into the reactor core; Arrangements for removing fluent material from the reactor core (pumping coolant G21D)	G21C19/28	G21C19/28		189
G21C19/30	9	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 G21C19/50; separation in general B01D)}	G21C19/30	G21C19/30		138
G21C19/303	10	specially adapted for gases (decontamination of gases G21F9/02)	G21C19/303	G21C19/303		179
G21C19/307	10	specially adapted for liquids (decontamination of liquids G21F9/04)	G21C19/307	G21C19/307		371
G21C19/31	11	for molten metals	G21C19/31	G21C19/31		72
G21C19/313	12	using cold traps	G21C19/313	G21C19/313		44
G21C19/317	10	Recombination devices for radiolytic dissociation products	G21C19/317	G21C19/317		133
G21C19/32	8	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 G21F9/00)	G21C19/32	G21C19/32		567
G21C19/34	8	Apparatus or processes for dismantling nuclear fuel, e.g. before reprocessing {; Apparatus or processes for dismantling strings of spent fuel elements}(shielded cells G21F7/00)	G21C19/34	G21C19/34		140
G21C19/36	9	Mechanical means only	G21C19/36	G21C19/36		244
G21C19/365	10	Removing cannings or casings from fuel	G21C19/365	G21C19/365		12
G21C19/37	11	by separating into pieces both the canning or the casing and the fuel element, e.g. by cutting or shearing	G21C19/37	G21C19/37		35
G21C19/375	10	Compacting devices, e.g. for fuel assemblies	G21C19/375	G21C19/375		12
G21C19/38	9	Chemical means only	G21C19/38	G21C19/38		101
G21C19/40	8	Arrangements for preventing occurrence of critical conditions, e.g. during storage	G21C19/40	G21C19/40		279
G21C19/42	8	Reprocessing of irradiated fuel	G21C19/42	G21C19/42		163
G21C19/44	9	of irradiated solid fuel	G21C19/44	G21C19/44		210
G21C19/46	10	Aqueous processes {, e.g. by using organic extraction means, including the regeneration of these means}	G21C19/46	G21C19/46		704
G21C19/48	10	Non-aqueous processes	G21C19/48	G21C19/48		371
G21C19/50	9	of irradiated fluid fuel {, e.g. regeneration of fuels while the reactor is in operation}	G21C19/50	G21C19/50		81
G21C21/00	7	Apparatus or processes specially adapted to the manufacture of reactors or parts thereof (in general section B, e.g. B23)	G21C21/00	G21C21/00		542
G21C21/02	8	Manufacture of fuel elements or breeder elements contained in non-active casings	G21C21/02	G21C21/02		1023
G21C21/04	9	by vibrational compaction or tamping {of fuel in the jacket}	G21C21/04	G21C21/04		84
G21C21/06	9	by {rotatable} swaging {of the jacket around the fuel}	G21C21/06	G21C21/06		24
G21C21/08	9	by a slip-fit cladding process {by crimping the jacket around the fuel}	G21C21/08	G21C21/08		54
G21C21/10	9	by extrusion, drawing, or stretching {by rolling, e.g. "picture frame" technique}	G21C21/10	G21C21/10		166
G21C21/12	9	by hydrostatic or thermo-pneumatic canning {in general by pressing without lengthening, e.g. explosive coating}	G21C21/12	G21C21/12		65
G21C21/14	9	by plating {the fuel} in a fluid	G21C21/14	G21C21/14		47
G21C21/16	9	by casting or dipping techniques	G21C21/16	G21C21/16		109
G21C21/18	8	Manufacture of control elements covered by group G21C7/00	G21C21/18	G21C21/18		117
G21C23/00	7	Adaptations of reactors to facilitate experimentation or irradiation	G21C23/00	G21C23/00		172
