CLASS 976, NUCLEAR TECHNOLOGY

FOR000

CLASS-RELATED FOREIGN DOCUMENTS

	This subclass has no definition.

DIG1	ALLEGED CONTROLLED FUSION REACTORS (G21B-1/00) ** (UNCONTROLLED REACTORS DIG. 423; ARRANGEMENTS FOR HEATING OR CONFINING PLASMA H05H-1/02)

	This subclass has no definition.

DIG2	. Combined fission-fusion reactors [G21B-1/00B] *** (see also DIG. 5+)

	This subclass has no definition.

DIG3	. Inertial confinement fusion reactor [G21B-1/00C] *** (plasma produced by laser H05H-1/22B; by particle beam H05H-1/22C)

	This subclass has no definition.

DIG4	. Using a beam of particles some of which react with other particles [G21B-1/02]

	This subclass has no definition.

DIG5	NUCLEAR REACTORS [G21C-1/00] *** (FUSION REACTORS H05H-1/00; NUCLEAR EXPLOSIVES DIG. 423; ANALOGUE COMPUTERS THEREFOR G06G-7/54)

	This subclass has no definition.

DIG6	. Integral reactors (i.e., the reactor core and the heat exchanger are placed in one vessel; the reactor vessel and the heat exchanger form an integral construction) [G21C-1/00B]

	This subclass has no definition.

DIG7	.. Where the prime mover is also placed in the vessel [G21C-1/00B2]

	This subclass has no definition.

DIG8	.. Where the heat exchanger is disposed above the core [G21C-1/00B3]

	This subclass has no definition.

DIG9	.. Where the heat exchanger is disposed beneath the core [G21C-1/00B4]

	This subclass has no definition.

DIG10

.. Where the heat exchanger is disposed beside the core [G21C-1/00B5]

	This subclass has no definition.

DIG11

. Fast fission reactors (i.e., reactors not using a moderator; metal cooled reactors; fast breeders) [G21C-1/02]

	This subclass has no definition.

DIG12

.. Characterized by the concept and properties of the core [G21C-1/02B]

	This subclass has no definition.

DIG13

... Where the core is divided into zones with fuel and zones with breeding material [G21C-1/02B2]

	This subclass has no definition.

DIG14

.. Cooled by a not essentially pressurized coolant (e.g., tub type) [G21C-1/02D] *** (cooling arrangements DIG. 187+)

	This subclass has no definition.

DIG15

.. Cooled by a pressurized coolant [G21C-1/02F] *** (cooling arrangements DIG. 187+)

	This subclass has no definition.

DIG16

. Thermal reactors; Epithermal reactors [G21C-1/04]

	This subclass has no definition.

DIG17

.. Heterogeneous reactors (i.e., in which the fuel and moderator are separated) [G21C-1/06]

	This subclass has no definition.

DIG18

... Pebble-bed reactors; Reactors with granular fuel [G21C-1/06B]

	This subclass has no definition.

DIG19

... Moderator being highly pressurized (e.g., boiling water reactor; integral super-heat reactor; pressurized water reactor) [G21C-1/08] *** (DIG. 30 takes precedence)

	This subclass has no definition.

DIG20

.... Pressure regulating arrangements; "pressurizers" [G21C-1/08B]

	This subclass has no definition.

DIG21

.... Reactors where the coolant is overheated [G21C-1/08D]

	This subclass has no definition.

DIG22

.... Boiling water reactors [G21C-1/08E]

	This subclass has no definition.

DIG23

.... Pressurized water reactors [G21C-1/08F]

	This subclass has no definition.

DIG24

.... Moderator and coolant being different or separated [G21C-1/10]

	This subclass has no definition.

DIG25

..... Moderator being solid (e.g., Magnox reactor, gas-graphite reactor [G21C-1/12]

	This subclass has no definition.

DIG26

... Moderator being substantially not pressurized (e.g., swimming-pool reactor [G21C-1/14] *** (DIG. 30 takes precedence)

	This subclass has no definition.

DIG27

.... Moderator and coolant being different or separated (e.g., sodium-graphite reactor, sodium-heavy water reactor, organic coolant-heavy water reactor) [G21C-1/16]

	This subclass has no definition.

DIG28

..... Coolant being pressurized [G21C-1/18]

	This subclass has no definition.

DIG29

...... Moderator being liquid (e.g., pressure-tube reactor, also the construction of the pressure-tubes) [G21C-1/20]

	This subclass has no definition.

DIG30

... Using fluid or fluent fuel [G21C-1/22] *** (With granular fuel DIG. 18)

	This subclass has no definition.

DIG31

.. Homogeneous reactors (i.e., in which the fuel and moderator present an effectively homogeneous medium to the neutrons) [G21C-1/24]

	This subclass has no definition.

DIG32

... Single-region reactors [G21C-1/26]

	This subclass has no definition.

DIG33

... Two-region reactors [G21C-1/28]

	This subclass has no definition.

DIG34

. Subcritical reactors; Experimental reactors with exception of swimming-pool reactors, zero-energy reactors [G21C-1/30]

	This subclass has no definition.

DIG35

.. Experimental and irradiation arrangements inside the reactor [G21C-1/30B] *** (irradiation loops DIG. 36; material testing by neutrons G01N-23/00B)

	This subclass has no definition.

DIG36

.. Irradiation loops [G21C-1/30D]

	This subclass has no definition.

DIG37

REACTOR FUEL ELEMENTS AND THEIR ASSEMBLIES; SELECTION OF SUBSTANCES FOR USE AS REACTOR FUEL ELEMENTS [G21C-3/00]

	This subclass has no definition.

DIG38

. Fuel elements [G21C-3/02] *** (manufacturing DIG. 283)

	This subclass has no definition.

DIG39

.. Constructional details [G21C-3/04]

	This subclass has no definition.

DIG40

... Means for removal of gases from fuel elements [G21C-3/04B]

	This subclass has no definition.

DIG41

... Fuel elements comprising casings with a mass of granular fuel with coolant passages through them [G21C-3/04C]

	This subclass has no definition.

DIG42

... Fuel elements with porous or capillary structure [G21C-3/04D]

	This subclass has no definition.

DIG43

... Casings; Jackets; Jacket materials [G21C-3/06]

	This subclass has no definition.

DIG44

.... Jacket materials (e.g., alloys) [G21C-3/06B]

	This subclass has no definition.

DIG45

.... Provided with external means to promote heat-transfer (e.g., fins, baffles) [G21C-3/08]

	This subclass has no definition.

DIG46

.... End closures; means for tight mounting therefor [G21C-3/10]

	This subclass has no definition.

DIG47

..... Flattened end-closures [G21C-3/10B]

	This subclass has no definition.

DIG48

.... Means forming part of the element for locating it within the reactor core [G21C-3/12] *** (means not forming part of the element DIG. 102)

	This subclass has no definition.

DIG49

.... 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-3/14]

	This subclass has no definition.

DIG50

... Details of the construction within the casing [G21C-3/16]

	This subclass has no definition.

DIG51

.... Means for storage or immobilization of gases in fuel elements [G21C-3/16B]

	This subclass has no definition.

DIG52

.... Internal spacers; Other nonactive material within the casings (e.g., compensating for expansion of fuel rod; compensating for excess reactivity) [G21C-3/18] *** (interlayers DIG. 53)

	This subclass has no definition.

DIG53

.... With coating on fuel or on inside of casing; with nonactive interlayer between casing and active material; with multiple casings or multiple active layers [G21C-3/20]

	This subclass has no definition.

DIG54

.. Elements with fissile or breeder material in contact with coolant [G21C-3/22]

	This subclass has no definition.

DIG55

.. Elements with fissile or breeder material in fluid form within a nonactive casing [G21C-3/24]

	This subclass has no definition.

DIG56

.. Elements with fissile or breeder material in powder form within a nonactive casing [G21C-3/26] *** (DIG. 57 takes precedence)

	This subclass has no definition.

DIG57

.. Elements with fissile or breeder material in solid form within a nonactive casing [G21C-3/28]

	This subclass has no definition.

DIG58

. Assemblies of number of fuel elements in the form of a rigid unit [G21C-3/30]

	This subclass has no definition.

DIG59

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

	This subclass has no definition.

DIG60

... Means to influence the coolant flow through or around the assembly [G21C-3/32B] *** (DIG. 246 takes precedence)

	This subclass has no definition.

DIG61

... Coats and envelope surrounding the assembly [G21C-3/32C]

	This subclass has no definition.

DIG62

... Made of moderator-material [G21C-3/32D]

	This subclass has no definition.

DIG63

... Comprising fuel-elements of various compositions; comprising other pin-, rod-, or tube-like forms [G21C-3/32G] *** (elements influencing the coolant flow DIG. 60)

	This subclass has no definition.

DIG64

.... Special arrangements of elements in the assembly-lattice (e.g., fissile rods, fertile rods, water rods, poison rods, dummy-rods) [G21C-3/32G2]

	This subclass has no definition.

DIG65

... Supporting or hanging the elements in the assembly [G21C-3/32H] *** (Spacer grids DIG. 71); Means forming part of the assembly for inserting it into, or removing it from, the core; Means for coupling adjacent assemblies (means forming part of the element for inserting it into, or removing it from, the core; or means for coupling adjacent elements DIG. 49)

	This subclass has no definition.

DIG66

.... Supports for spacer grids [G21C-3/32H2]

	This subclass has no definition.

DIG67

... Means for the storage or removal of fission gases [G21C-3/32K] *** (means for the storage of fission gases in the elements DIG. 50; means for the removal of fission gases from elements DIG. 39+)

	This subclass has no definition.

DIG68

... Assembling the bundle; Exchange of elements in the bundle [G21C-3/32L]

	This subclass has no definition.

DIG69

... Spacer elements [G21C-3/32M] *** (spacer grids DIG. 71)

	This subclass has no definition.

DIG70

.... Helicoidal spacer elements [G21C-3/32M2]

	This subclass has no definition.

DIG71

... Spacer grids; other spacer devices [G21C-3/34]

	This subclass has no definition.

DIG72

.... Compact spacer grids (e.g., made of a plate or a blade) [G21C-3/34A]

	This subclass has no definition.

DIG73

.... Spacer grids formed of assembled tubular elements [G21C-3/34B]

	This subclass has no definition.

DIG74

.... Spacer grids wherein each cell has a circular cross section; cells formed of assembled metallic nonintersecting strips [G21C-3/34C]

	This subclass has no definition.

DIG75

.... Spacer grids wherein each cell has a polygonal (e.g., square cross section) ; cells formed of assembled metallic nonintersecting strips [G21C-3/34D]

	This subclass has no definition.

DIG76

..... Polygonal cells formed of intersecting strips [G21C-3/34D2]

	This subclass has no definition.

DIG77

...... The cells being provided with fuel element supporting members [G21C-3/34D2A]

	This subclass has no definition.

DIG78

....... Supporting members formed only by deformations in the intersecting strips [G21C-3/34D2A2]

	This subclass has no definition.

DIG79

....... Supporting members formed only of elements fixed on the strips (e.g., by welding) [G21C-3/34D2A4]

	This subclass has no definition.

DIG80

.... Spacer grids formed by metallic wires (e.g., springs) [G21C-3/34E]

	This subclass has no definition.

DIG81

.... Fabrication of spacer grids [G21C-3/34F]

	This subclass has no definition.

DIG82

.. Assemblies of plate-shaped fuel elements or coaxial tubes [G21C-3/36]

	This subclass has no definition.

DIG83

. Fuel units consisting of a single fuel element in a supporting sleeve or in another supporting element [G21C-3/38]

	This subclass has no definition.

DIG84

. Structural combination of fuel element with thermoelectric element for direct production of electric energy from fission heat; or with another arrangement for direct production of electric energy (e.g., a thermionic device) [G21C-3/40] *** (temperature measurement DIG. 236; combination with thermoelements for temperature measurements DIG. 241)

	This subclass has no definition.

DIG85

. Selection of substances for use as reactor fuel [G21C-3/42]

	This subclass has no definition.

DIG86

.. Fluid or fluent reactor fuel [G21C-3/44]

	This subclass has no definition.

DIG87

... Aqueous compositions [G21C-3/46]

	This subclass has no definition.

DIG88

.... True or colloidal solutions of the active constituent [G21C-3/48]

	This subclass has no definition.

DIG89

.... Suspensions of the active constituent; Slurries [G21C-3/50]

	This subclass has no definition.

DIG90

... Liquid metal compositions [G21C-3/52]

	This subclass has no definition.

DIG91

... Fused salt, oxide or hydroxide compositions [G21C-3/54]

	This subclass has no definition.

DIG92

... Gaseous compositions; Suspensions in a gaseous carrier [G21C-3/56]

	This subclass has no definition.

DIG93

.. Solid reactor fuel; Pellets made of fissile material [G21C-3/58]

	This subclass has no definition.

DIG94

... Metallic fuel; Intermetallic dispersions [G21C-3/60]

	This subclass has no definition.

DIG95

... Ceramic fuel [G21C-3/62]

	This subclass has no definition.

DIG96

.... Oxide fuels [G21C-3/62B]

	This subclass has no definition.

DIG97

.... Coated fuel particles [G21C-3/62J]

	This subclass has no definition.

DIG98

.... Ceramic dispersion fuel (e.g., cermet) [G21C-3/64]

	This subclass has no definition.

DIG99

MODERATOR OR CORE STRUCTURE; SELECTION OF MATERIALS FOR USE AS MODERATOR [G21C-5/00]

	This subclass has no definition.

DIG100

. Details [G21C-5/02]

	This subclass has no definition.

DIG101

.. Spatial arrangements allowing for Wigner growth [G21C-5/04]

	This subclass has no definition.

DIG102

.. Means for locating or supporting fuel elements [G21C-5/06] *** (means forming part of the element DIG. 48)

	This subclass has no definition.

DIG103

.. Means for preventing undesired asymmetric expansion of the complete structure (e.g., stretching devices, pins) [G21C-5/08]

	This subclass has no definition.

DIG104

.. Means for supporting the complete structure [G21C-5/10] *** (arrangements for supporting vessels and core structure DIG. 168)

	This subclass has no definition.

DIG105

. Characterized by composition (e.g., the moderator containing additional substances which ensure improved heat resistance of the moderator [G21C-5/12] *** (purification of fluid moderators during the operation of the reactor DIG. 266)

	This subclass has no definition.

DIG106

.. Moderators made of organic materials [G21C-5/12B]

	This subclass has no definition.

DIG107

.. Carbonic moderators [G21C-5/12G]

	This subclass has no definition.

DIG108

. Characterized by shape [G21C-5/14]

	This subclass has no definition.

DIG109

.. Shape of its constituent parts [G21C-5/16]

	This subclass has no definition.

DIG110

. Characterized by the provision of more than one active zone [G21C-5/18]

	This subclass has no definition.

DIG111

.. Wherein one zone contains fissile material and another zone contains breeder material [G21C-5/20]

	This subclass has no definition.

DIG112

.. Wherein one zone is a superheating zone [G21C-5/22]

	This subclass has no definition.

DIG113

CONTROL OF NUCLEAR REACTION [G21C-7/00]

	This subclass has no definition.

DIG114

. Flux flattening [G21C-7/00B]

	This subclass has no definition.

DIG115

. By using self-regulating properties of reactor materials (e.g., Doppler effect) [G21C-7/02] *** (arrangements that involve temperature stability DIG. 136)

	This subclass has no definition.

DIG116

.. Of burnable poisons [G21C-7/04]

	This subclass has no definition.

DIG117

. By application of neutron-absorbing material (i.e., material with absorption cross section very much in excess of reflection cross section) [G21C-7/06]

	This subclass has no definition.

DIG118

.. By displacement of solid control elements (e.g., control rods) [G21C-7/08]

	This subclass has no definition.

DIG119

... Construction of control elements [G21C-7/10]

	This subclass has no definition.

DIG120

.... Control assemblies containing one or more absorbant as well as other elements (e.g., fuel or moderator elements) [G21C-7/10B]

	This subclass has no definition.

DIG121

.... Control elements adapted for pebble bed reactors [G21C-7/10C]

	This subclass has no definition.

DIG122

.... Deformable control elements (e.g., flexible, telescopic or articulated) [G21C-7/10D]

	This subclass has no definition.

DIG123

.... Control elements made of flat elements; Control elements having cruciform cross section [G21C-7/10E]

	This subclass has no definition.

DIG124

.... Cluster or spider control rods [G21C-7/10F]

	This subclass has no definition.

DIG125

... Means for moving control elements to desired position [G21C-7/12]

	This subclass has no definition.

DIG126

.... Mechanical drive arrangements [G21C-7/14]

	This subclass has no definition.

DIG127

.... Hydraulic or pneumatic drive [G21C-7/16]

	This subclass has no definition.

DIG128

... Means for obtaining differential movement of control elements [G21C-7/18]

	This subclass has no definition.

DIG129

... Disposition of shock-absorbing devices; Braking arrangements [G21C-7/20] *** (shock absorbers in general F16F)

	This subclass has no definition.

DIG130

.. By displacement of a fluid or fluent neutron-absorbing material (e.g., by adding neutron absorbing material to the coolant) [G21C-7/22]

	This subclass has no definition.

DIG131

.. Selection of substances for use as neutron-absorbing material [G21C-7/24]

	This subclass has no definition.

DIG132

. By displacement of the moderator or parts thereof; by changing the moderator concentration [G21C-7/26]

	This subclass has no definition.

DIG133

.. Spectral shift control [G21C-7/26B]

	This subclass has no definition.

DIG134

. By displacement of the reflector or parts thereof [G21C-7/28]

	This subclass has no definition.

DIG135

. By displacement of the reactor fuel or fuel elements [G21C-7/30]

	This subclass has no definition.

DIG136

. By varying flow of coolant through the core; by adjusting the coolant or moderator temperature [G21C-7/32]

	This subclass has no definition.

DIG137

. By utilization of a primary neutron source [G21C-7/34]

	This subclass has no definition.

DIG138

. Control circuits [G21C-7/36]

	This subclass has no definition.

DIG139

EMERGENCY PROTECTION ARRANGEMENTS STRUCTALLY ASSOCIATED WITH THE REACTOR (E.G., SAFETY VALVES PROVIDED WITH PRESSURE EQUALIZATION DEVICES) [G21C-9/00] *** (EMERGENCY COOLING ARRANGEMENTS DIG. 196)

	This subclass has no definition.

DIG140

. Pressure suppression [G21C-9/00B]

	This subclass has no definition.

DIG141

.. By rupture discs or diaphragms [G21C-9/00B2]

	This subclass has no definition.

DIG142

.. By stream condensation or by thermal accumulation [G21C-9/00B4]

	This subclass has no definition.

DIG143

. Core catchers [G21C-9/00D]

	This subclass has no definition.

DIG144

. Against explosions (e.g., blast shields) [G21C-9/00F]

	This subclass has no definition.

DIG145

. Against Na- or Ka- reactions [G21C-9/00I]

	This subclass has no definition.

DIG146

. 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) [G21C-9/02] *** (control elements, per se, DIG. 113+)

	This subclass has no definition.

DIG147

.. By fast movement of a solid (e.g, pebbles) [G21C-9/02B]

	This subclass has no definition.

DIG148

.. By an absorbant fluid [G21C-9/02D]

	This subclass has no definition.

DIG149

.. Reactor fuses [G21C-9/02F]

	This subclass has no definition.

DIG150

.. Rupture diaphragms [G21C-9/02H]

	This subclass has no definition.

DIG151

. Means for suppressing fires; Earthquake protection [G21C-9/04]

	This subclass has no definition.

DIG152

SHEILDING STRUCTURALLY ASSOCIATED WITH THE REACTOR [G21C-11/00]

	This subclass has no definition.

DIG153

. Biological sheilding; Neutron and gamma shielding [G21C-11/02] *** (in general DIG. 319+)

	This subclass has no definition.

DIG154

.. Inside the reactor vessel [G21C-11/02B]

	This subclass has no definition.

DIG155

... Structurally combined with the casing [G21C-11/02B2]

	This subclass has no definition.

DIG156

.. In apertures or channels through a wall [G21C-11/02D]

	This subclass has no definition.

DIG157

.. Characterized by the form or by the material [G21C-11/02F]

	This subclass has no definition.

DIG158

.. On waterborne craft [G21C-11/04]

	This subclass has no definition.

DIG159

. Reflecting shields (i.e., for minimizing loss of neutrons) [G21C-11/06]

	This subclass has no definition.

DIG160

. Thermal shields; Thermal linings (i.e., for dissipating heat from gamma radiation which would otherwise heat an outer biological shield); Thermal insulation [G21C-11/08]

	This subclass has no definition.

DIG161

.. Consisting of a nonmetallic layer of insulating material [G21C-11/08B]

	This subclass has no definition.

DIG162

.. Consisting of one or more metallic layers [G21C-11/08D]

	This subclass has no definition.

DIG163

... Consisting exclusively of several metallic layers [G21C-11/08D2]

	This subclass has no definition.

DIG164

.. Consisting of a combination of nonmetallic and metallic layers (e.g., metal-sand-metal-concrete) [G21C-11/08E]

	This subclass has no definition.

DIG165

.. Consisting of a stagnant or a circulating fluid [G21C-11/08F]

	This subclass has no definition.

DIG166

PRESSURE VESSELS; CONTAINMENT VESSELS [G21C-13/00] *** (CHEMICAL OR PHYSICAL PROCESSES B01J-3/00; PRESSURE VESSELS IN GENERAL F16J-12/00)

	This subclass has no definition.

DIG167

. Details (e.g., seals, supporting constructions, ventillating arrangements, tube joints with a vessel wall) [G21C-13/02]

	This subclass has no definition.

DIG168

.. Supporting constructions for pressure vessels or containers [G21C-13/02B]

	This subclass has no definition.

DIG169

.. Seals (e.g., for pressure vessels or containers [G21C-13/02D]

	This subclass has no definition.

DIG170

... For container apertures [G21C-13/02D2]

	This subclass has no definition.

DIG171

.. Tube joints with a vessel wall (e.g., taking into account thermal stresses) [G21C-13/02F]

	This subclass has no definition.

DIG172

.. Ventillating arrangements [G21C-13/02G]

	This subclass has no definition.

DIG173

.. Tube crossings through a vessel wall [G21C-13/02H]

	This subclass has no definition.

DIG174

.. Arrangements for expansion and contraction [G21C-13/04]

	This subclass has no definition.

DIG175

.. Sealing plugs [G21C-13/06]

	This subclass has no definition.

DIG176

... For tubes (e.g., standpipes; Locking-devices for the plugs included) [G21C-13/06B]

	This subclass has no definition.

DIG177

.... Seals for the plugs [G21C-13/06B2]

	This subclass has no definition.

DIG178

... Closures for reactor-vessels (also rotatable) [G21C-13/06D]

	This subclass has no definition.

DIG179

.... Seals for closures or for rotatable closures [G21C-13/06D2]

	This subclass has no definition.

DIG180

. Vessels characterized by the material; Selection of materials for pressure vessels [G21C-13/08]

	This subclass has no definition.

DIG181

.. Metallic vessels [G21C-13/08B]

	This subclass has no definition.

DIG182

... Tube-type vessels (e.g., for not essentially pressurized coolants) [G21C-13/08B2]

	This subclass has no definition.

DIG183

.. Concrete vessels [G21C-13/08D]

	This subclass has no definition.

DIG184

... Made of prestressed-concrete [G21C-13/08D2]

	This subclass has no definition.

DIG185

.... Particulars concerning pre-stressing devices (and cables) [G21C-13/08D2B]

	This subclass has no definition.

DIG186

. Means for preventing contamination in the event of leakage (e.g., double wall) [G21C-13/10]

	This subclass has no definition.

DIG187

COOLING ARRANGEMENTS WITHIN THE PRESSURE VESSEL CONTAINING THE CORE; SELECTION OF SPECIFIC COOLANTS [G21C-15/00]

	This subclass has no definition.

DIG188

. Arrangements or disposition of passages in which heat is transferred to the coolant; Coolant flow control devices [G21C-15/02] *** (DIG. 246 takes precedence); (coolant flow control through fuel assemblies (e.g., flow restrictors) DIG. 60)

	This subclass has no definition.

DIG189

.. From fissile or breeder material [G21C-15/04] *** (DIG. 59 takes precedence)

	This subclass has no definition.

DIG190

... In fuel elements [G21C-15/06]

	This subclass has no definition.

DIG191

.. From moderating material [G21C-15/08]

	This subclass has no definition.

DIG192

.. From reflector or thermal shield [G21C-15/10]

	This subclass has no definition.

DIG193

.. From pressure vessel; from containment vessel [G21C-15/12]

	This subclass has no definition.

DIG194

.. From headers; from joints in ducts [G21C-15/14]

	This subclass has no definition.

DIG195

. Comprising means for separating liquid and steam [G21C-15/16]

	This subclass has no definition.

DIG196

. Emergency cooling arrangements; Removing shut-down heat [G21C-15/18]

	This subclass has no definition.

DIG197

. Partitions or thermal insulation between fuel channel and moderator [G21C-15/20]

	This subclass has no definition.

DIG198

. Structural association of coolant tubes with headers [G21C-15/22]

	This subclass has no definition.

DIG199

. Promoting flow of the coolant [G21C-15/24]

	This subclass has no definition.

DIG200

.. For liquids [G21C-15/24B]

	This subclass has no definition.

DIG201

... For liquid metals [G21C-15/24B2]

	This subclass has no definition.

DIG202

... Jet-pumps [G21C-15/24B4]

	This subclass has no definition.

DIG203

.. For gases (ventilators) [G21C-15/24D]

	This subclass has no definition.

DIG204

.. Heat-pipes [G21C-15/24F]

	This subclass has no definition.

DIG205

.. By convection (e.g., using chimneys, using divergent channels [G21C-15/26]

	This subclass has no definition.

DIG206

. Selection of specific coolants; additions to the reactor coolants (e.g., against moderator corrosion) [G21C-15/28] *** (if serving as the moderator DIG.105, Compositions, per se, C09K-5/00; Organic coolants DIG. 106; purification and regeneration of the reactor coolants DIG. 266)

	This subclass has no definition.

DIG207

MONITORING; TESTING; MAINTAINING [G21C-17/00]

	This subclass has no definition.

DIG208

. Mechanical simulators [G21C-17/00B] *** (electrical or magnetic simulators G06G-7/54)

	This subclass has no definition.

DIG209

. Detection of leaks [G21C-17/00C] *** (by testing the coolant or the moderator DIG. 224)

	This subclass has no definition.

DIG210

. Remote inspection of vessels (e.g., pressure vessels) [G21C-17/00D]

	This subclass has no definition.

DIG211

.. Inspection of outer surfaces of vessels [G21C-17/00D1]

	This subclass has no definition.

DIG212

.. Inspection of inner surfaces of vessels [G21C-17/00D2]

	This subclass has no definition.

DIG213

.. Inspection vehicles [G21C-17/00D3]

	This subclass has no definition.

DIG214

. Inspection or maintenance of pipe-lines or tubes in nuclear installations [G21C-17/00F]

	This subclass has no definition.

DIG215

. Devices or arrangements for monitoring coolant or moderator [G21C-17/02]

	This subclass has no definition.

DIG216

.. For monitoring liquid coolants or moderators [G21C-17/02B]

	This subclass has no definition.

DIG217

... For monitoring liquid metal coolants [G21C-17/02B2] *** (molten metal sampling in general G01N-1/12B)

	This subclass has no definition.

DIG218

.... Liquid metal leaks detection [G21C-17/02B2B] *** (detecting leaks in pipe-line systems in general F17D-5/00)

	This subclass has no definition.

DIG219

.. For monitoring gaseous coolants [G21C-17/02D]

	This subclass has no definition.

DIG220

.. Solid moderators testing (e.g., graphite) [G21C-17/02F]

	This subclass has no definition.

DIG221

.. Reactor coolants flow measuring or monitoring [G21C-17/02H] *** (measuring volume or mass flow in general G01F)

	This subclass has no definition.

DIG222

.. Moderator or coolant level detection devices [G21C-17/02K] *** (indicating or measuring liquid level in general G01F-23/00)

	This subclass has no definition.

DIG223

.. Moderator or coolant boiling detection [G21C-17/02M]

	This subclass has no definition.

DIG224

.. Detecting burst slugs [G21C-17/04]

	This subclass has no definition.

DIG225

... Characterized by (matrix) systems for checking the coolant channels [G21C-17/04B]

	This subclass has no definition.

DIG226

... Devices for selective sampling (e.g., valves, shutters, rotatable selector valves) [G21C-17/04D]

	This subclass has no definition.

DIG227

... Detectors and metering devices for the detection of fission products [G21C-17/04F]

	This subclass has no definition.

DIG228

.... Precipitation chambers [G21C-17/04F2]

	This subclass has no definition.

DIG229

.... Detection and metering circuits [G21C-17/04F4]

	This subclass has no definition.

DIG230

... Characterized by a special construction of fuel elements (e.g., by a confined "tracer") [G21C-17/04H]

	This subclass has no definition.

DIG231

. Devices or arrangements for monitoring or testing fuel or fuel elements (e.g., for burn-up, for contamination, for leak-tightness) not during reactor operation [G21C-17/06] *** (DIG. 235, DIG. 236 take precedence) (detection of leaking fuel elements during reactor operation DIG. 224)

	This subclass has no definition.

DIG232

.. Leak-tightness control [G21C-17/06B] *** (DIG. 234 takes precedence)

	This subclass has no definition.

DIG233

.. Burn-up control [G21C-17/06D] *** (DIG. 234 takes precedence)

	This subclass has no definition.

DIG234

.. Control of spherical elements [G21C-17/06F]

	This subclass has no definition.

DIG235

. Structural combination of reactor core or moderator structure with viewing means (e.g., with television camera, periscope, window) [G21C-17/08]

	This subclass has no definition.

DIG236

. Structural combination of fuel element, control rod, reactor core, or moderator structure with sensitive instruments (e.g., for measuring temperature) [G21C-17/10]

	This subclass has no definition.

DIG237

.. Measuring reactivity [G21C-17/10B]

	This subclass has no definition.

DIG238

.. Measuring the reactor flux within the reactor (e.g., within its pressure vessel) [G21C-17/10D]

	This subclass has no definition.

DIG239

.. Measuring the temperature [G21C-17/10E]

	This subclass has no definition.

DIG240

.. Passages and insulators for electric cables and for measuring purposes [G21C-17/10G]

	This subclass has no definition.

DIG241

.. The sensitive element being part of a fuel element or a fuel assembly [G21C-17/10S] *** (structural combination with a thermoelectric element for direct production of electrical energy DIG. 84)

	This subclass has no definition.

DIG242

.. Sensitive element forming part of control element [G21C-17/12]

	This subclass has no definition.

DIG243

. Period meters [G21C-17/14]

	This subclass has no definition.

DIG244

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-19/00]

	This subclass has no definition.

DIG245

. Details of handling arrangements [G21C-19/02]

	This subclass has no definition.

DIG246

.. 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") [G21C-19/04]

	This subclass has no definition.

DIG247

.. Magazines for holding fuel element or control elements [G21C-19/06]

	This subclass has no definition.

DIG248

... Storage racks; Storage pools [G21C-19/06B]

	This subclass has no definition.

DIG249

... Rotatable magazines [G21C-19/06D]

	This subclass has no definition.

DIG250

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

	This subclass has no definition.

DIG251

.. Lifting devices or pulling devices adapted for cooperation with fuel elements or with control elements [G21C-19/10]

	This subclass has no definition.

DIG252

... With grasping or spreading coupling elements [G21C-19/10B]

	This subclass has no definition.

DIG253

... With revolving coupling elements (e.g., socket coupling) [G21C-19/10D]

	This subclass has no definition.

DIG254

... With latching devices and ball couplings [G21C-19/10F]

	This subclass has no definition.

DIG255

.. Arrangements for exerting direct hydraulic or pneumatic force on fuel element or on control element [G21C-19/12]

	This subclass has no definition.

DIG256

. Characterized by their adaptation for use with horizontal channels in the reactor core [G21C-19/14]

	This subclass has no definition.

DIG257

. Articulated or telescopic chutes or tubes for the connection to channels in the reactor core [G21C-19/16]

	This subclass has no definition.

DIG258

. Apparatus for bringing fuel elements to the reactor charge area (e.g., from a storage place) [G21C-19/18]

	This subclass has no definition.

DIG259

. Arrangements for introducing object into the pressure vessel; Arrangements for handling objects within the pressure vessel; Arrangements for removing objects from the pressure vessel [G21C-19/20]

	This subclass has no definition.

DIG260

.. Arrangements for handling ball-form (i.e., pebble fuel) [G21C-19/20A]

	This subclass has no definition.

DIG261

.. Interchanging of fuel elements in the core (fuel shuffling) [G21C-19/20B]

	This subclass has no definition.

DIG262

.. Arrangements for obtaining access to the interior of a pressure vessel while the reactor is operating [G21C-19/22]

	This subclass has no definition.

DIG263

... By using an auxiliary vessel which is temporarily sealed to the pressure vessel [G21C-19/24]

	This subclass has no definition.

DIG264

. Arrangements for removing jammed or damaged fuel elements or control elements; Arrangements for moving broken parts thereof [G21C-19/26]

	This subclass has no definition.

DIG265

. Arrangements for introducing fluent material into the reactor core; Arrangements for removing fluent material from the reactor core [G21C-19/28] *** (pumping coolant DIG. 199+ and 294)

	This subclass has no definition.

DIG266

.. With continuous purification of circulating fluent material (e.g., by extraction of fission products, deterioration or corrosion products, impurities (e.g., by cold traps) [G21C-19/30] *** (purification of circulating fluid fuels DIG. 281; separation in general B01D)

	This subclass has no definition.

DIG267

... Specially adapted for gases [G21C-19/30B] *** (decontamination of gases DIG. 378)

	This subclass has no definition.

DIG268

... Specially adapted for liquids [G21C-19/30D] *** (decontamination of liquids DIG. 379)

	This subclass has no definition.

DIG269

.... For molten metals [G21C-19/30D2]

	This subclass has no definition.

DIG270

..... Using "cold traps" [G21C-19/30D2B]

	This subclass has no definition.

DIG271

... Recombination devices [G21C-19/30R]

	This subclass has no definition.

DIG272

. 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 [G21C-19/32] *** (disposal of waste material DIG. 375+)

	This subclass has no definition.

DIG273

. Apparatus or processes for removing canning or casings from fuel; Separation of fuel and jacket material; also fuel elements, perforation (e.g., for sampling); Separation of fuel elements and fuel element-jackets in pieces; removal of end closures [G21C-19/34] *** (shielded cells DIG. 355+)

	This subclass has no definition.

DIG274

.. Mechanical means only [G21C-19/36]

	This subclass has no definition.

DIG275

.. Chemical means only [G21C-19/38]

	This subclass has no definition.

DIG276

. Arrangements for preventing occurence of critical conditions (e.g., during storage) [G21C-19/40]

	This subclass has no definition.

DIG277

. Reprocessing of irradiated fuel [G21C-19/42]

	This subclass has no definition.

DIG278

.. Of irradiated solid fuel [G21C-19/44]

	This subclass has no definition.

DIG279

... Aqueous processes (e.g., by using organic extraction means, including the regeneration of these means) [G21C-19/46]

	This subclass has no definition.

DIG280

... Nonaqueous processes [G21C-19/48]

	This subclass has no definition.

DIG281

.. Of irradiated fuel; also the regeneration of the fuels while the reactor is in operation [G21C-19/50]

	This subclass has no definition.

DIG282

APPARATUS OR PROCESSES SPECIALLY ADAPTED TO THE MANUFACTURE OF REACTORS OR PARTS THEREOF [G21C-21/00] *** (IN GENERAL SECTION B, E.G., B23)

	This subclass has no definition.

DIG283

. Manufacture of fuel elements or breeder elements contained in nonactive casings [G21C-21/02]

	This subclass has no definition.

DIG284

.. By vibrational compaction or tamping of fuel in the jacket [G21C-21/04]

	This subclass has no definition.

DIG285

.. By rotatable swaging of the jacket around the fuel [G21C-21/06]

	This subclass has no definition.

DIG286

.. By a slip-fit cladding process; by crimping the jacket around the fuel [G21C-21/08]

	This subclass has no definition.

DIG287

.. By extrusion, drawing, or stretching; by rolling (e.g., "picture frame" technique) [G21C-21/10]

	This subclass has no definition.

DIG288

.. By hydrostatic or thermo-pneumatic cannings (in general by pressing without lenthening, e.g., explosive coating) [G21C-21/12]

	This subclass has no definition.

DIG289

.. By plating the fuel in a fluid [G21C-21/14]

	This subclass has no definition.

DIG290

.. By casting or dipping techniques [G21C-21/16]

	This subclass has no definition.

DIG291

.. Manufacture of control elements covered by DIG. 113+ [G21C-21/18]

	This subclass has no definition.

DIG292

DETAILS OF NUCLEAR POWER PLANT [G21D-1/00] *** (CONTROL DIG. 296)

	This subclass has no definition.

DIG293

. Nuclear facilities decommissioning arrangements [G21D-1/00B] *** (decontamination arrangements; treating radioactively contaminated material DIG. 375+)

	This subclass has no definition.

DIG294

. Arrangements of auxiliary equipment [G21D-1/02]

	This subclass has no definition.

DIG295

. Pumping arrangements [G21D-1/04] *** (within the reactor pressure vessel DIG. 199+; electrodynamic pumps H02K-44/02)

	This subclass has no definition.

DIG296

CONTROL OF NUCLEAR POWER PLANT [G21D-3/00] *** (CONTROL OF NUCLEAR REACTION IN GENERAL DIG. 113)

	This subclass has no definition.

DIG297

. Manual control [G21D-3/02]

	This subclass has no definition.

DIG298

. Safety arrangements [G21D-3/04] *** (emergency protection of reactor DIG. 139+)

	This subclass has no definition.

DIG299

.. Responsive to faults within the plant [G21D-3/06] *** (in the reactor DIG. 139+)

	This subclass has no definition.

DIG300

. Regulation of any parameters in the plant [G21D-3/08]

	This subclass has no definition.

DIG301

.. By a combination of a variable derived from neutron flux with other controlling variables (e.g., derived from temperature, cooling flow, pressure) [G21D-3/10]

	This subclass has no definition.

DIG302

.. By adjustment of the reactor in response only to changes in engine demand [G21D-3/12]

	This subclass has no definition.

DIG303

... Varying flow of coolant [G21D-3/14]

	This subclass has no definition.

DIG304

... Varying reactivity [G21D-3/16]

	This subclass has no definition.

DIG305

.. By adjustment of plant external to the reactor only in response to change in reactivity [G21D-3/18]

	This subclass has no definition.

DIG306

ARRANGEMENTS OF REACTOR AND ENGINE IN WHICH REACTOR-PRODUCED HEAT IS CONVERTED INTO MECHANICAL ENERGY [G21D-5/00]

	This subclass has no definition.

DIG307

. Reactor and engine structurally combined (e.g., portable) [G21D-5/02]

	This subclass has no definition.

DIG308

. Reactor and engine not structurally combined [G21D-5/04]

	This subclass has no definition.

DIG309

.. With engine working medium circulating through reactor core [G21D-5/06]

	This subclass has no definition.

DIG310

.. With engine working medium heated in a heat exhanger by the reactor coolant [G21D-5/08]

	This subclass has no definition.

DIG311

... Liquid working medium partially heated by reactor and vaporized by heat source external to the core (e.g., with oil heating) [G21D-5/10]

	This subclass has no definition.

DIG312

... Liquid working medium vaporized by reactor coolant [G21D-5/12]

	This subclass has no definition.

DIG313

.... And also superheated by reactor coolant [G21D-5/14]

	This subclass has no definition.

DIG314

.... Superheated by separate heat source [G21D-5/16]

	This subclass has no definition.

DIG315

ARRANGEMENTS FOR DIRECT PRODUCTION OF ELECTRIC ENERGY FROM FUSION OR FISSION REACTIONS [G21D-7/00] *** (OBTAINING ELECTRIC ENERGY FROM RADIOACTIVE SOURCES DIG. 410)

	This subclass has no definition.

DIG316

. Using magneto-hydrodynamic generators [G21D-7/02]

	This subclass has no definition.

DIG317

. Using thermoelectric elements and/or thermoionic converters [G21D-7/04] *** (structural combination of fuel element with thermoelectric element and/or thermoionic converter DIG. 84; structural combination of fuel element with thermoelectric element DIG. 415, DIG. 84)

	This subclass has no definition.

DIG318

ARRANGEMENTS TO PROVIDE HEAT FOR PURPOSES OTHER THAN CONVERSION INTO POWER (E.G., FOR HEATING BUILDINGS) [G21D-9/00]

	This subclass has no definition.

DIG319

SHIELDING CHARACTERIZED BY THE COMPOSITION OF THE MATERIALS [G21F-1/00]

	This subclass has no definition.

DIG320

. Selection of uniform shielding materials [G21F-1/02]

	This subclass has no definition.

DIG321

.. Liquids [G21F-1/02B]

	This subclass has no definition.

DIG322

.. Semi-liquids, gels, pastes [G21F-1/02C]

	This subclass has no definition.

DIG323

.. Concretes; Other hydraulic hardening materials [G21F-1/04]

	This subclass has no definition.

DIG324

... Combined with other materials dispersed in the carrier [G21F-1/04B]

	This subclass has no definition.

DIG325

.... With organic substances [G21F-1/04B2]

	This subclass has no definition.

DIG326

.... With metals [G21F-1/04B4]

	This subclass has no definition.

DIG327

.. Ceramics; Glasses; Refractories [G21F-1/06] *** (cermets DIG. 328)

	This subclass has no definition.

DIG328

.. Metals; Alloys; Cermets (i.e., sintered mixtures of ceramics and metals) [G21F-1/08]

	This subclass has no definition.

DIG329

... Heavy metals or alloys [G21F-1/08B]

	This subclass has no definition.

DIG330

.. Organic substances; Dispersions in organic carriers [G21F-1/10]

	This subclass has no definition.

DIG331

... Dispersions in organic carriers [G21F-1/10B]

	This subclass has no definition.