IPC 7 English version G21C-G21C 5/22

IPC ⁷ English version

G21C-G21C00522

G21C 7/00 - G21C 17/14

SECTION G – PHYSICS

G 21

NUCLEAR PHYSICS; NUCLEAR ENGINEERING

G 21 C

NUCLEAR REACTORS (analogue computers therefor G06G 7/54; fusion reactors G21B; nuclear explosives G21J)

Subclass Index

REACTORS

G21C 1/00

REACTOR ELEMENTS

Fuel; moderator; cooling; containment; shielding

G21C 3/00; G21C 5/00; G21C 15/00; G21C 13/00; G21C 11/00

Handling fuel and other materials

G21C 19/00

CONTROL; MONITORING, TESTING

G21C 7/00; G21C 17/00

EMERGENCY PROTECTION

G21C 9/00

MANUFACTURE

G21C 21/00

ADAPTATIONS OF REACTORS FOR EXPERIMENTATION OR IRRADIATION

G21C 23/00

Reactors

General details not provided for in groups G21C 3/00 to G21C 19/00 [3]

Fast fission reactors, i.e. reactors not using a moderator

cooled by a coolant not essentially pressurised, e.g. pool-type reactors [5]

Thermal reactors

Heterogeneous reactors, i.e. in which fuel and moderator are separated

Pebble-bed reactors; Reactors with granular fuel [5]

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

Pressure regulating arrangements, i.e. pressurisers [5]

moderator and coolant being different or separated

moderator being solid, e.g. Magnox reactor

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

moderator and coolant being different or separated, e.g. sodium-graphite reactor

coolant being pressurised

moderator being liquid, e.g. pressure-tube reactor

using liquid or gaseous fuel

Homogeneous reactors, i.e. in which fuel and moderator present an effectively homogeneous medium to the neutrons

Single-region reactors

Two-region reactors

Subcritical reactors

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) [3]

Reactor fuel elements or their assemblies; Selection of substances for use as reactor fuel elements

Fuel elements

Constructional details

Casings; Jackets

characterised by their material, e.g. alloys [5]

provided with external means to promote heat-transfer, e.g. fins, baffles, corrugations

End closures

Means forming part of the element for locating it within the reactor core; External spacers for this purpose

Means forming part of the element for inserting it into, or removing it from, the core; Means for coupling adjacent elements

Details of the construction within the casing

Means for storage or immobilisation of gases in fuel elements [5]

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)

with coating on fuel or on inside of casing; with non-active interlayer between casing and active material

with fissile or breeder material in contact with coolant

with fissile or breeder material in fluid form within a non-active casing

with fissile or breeder material in powder form within a non-active casing

with fissile or breeder material in solid form within a non-active casing

Assemblies of a number of fuel elements in the form of a rigid unit

Bundles of parallel pin-, rod-, or tube-shaped fuel elements

322

Means to influence the coolant flow through or around the bundles [5]

324

Coats or envelopes for the bundles [5]

326

comprising fuel elements of different composition; Comprising, in addition to the fuel elements, other pin-, rod-, or tube-shaped elements, e.g. control rods, grid support rods, fertile rods, poison rods or dummy rods [5]

328

Relative disposition of the elements in the bundle lattice [5]

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 [5]

332

Supports for spacer grids [5]

334

Assembling the bundles [5]

335

Exchanging elements in irradiated bundles [5]

336

Spacer elements for fuel rods in the bundle (spacer grids G21C 3/34) [5]

338

Helicoidal spacer elements [5]

Spacer grids

344

formed of assembled tubular elements [5]

348

formed of assembled non-intersecting strips [5]

352

formed of assembled intersecting strips [5]

356

being provided with fuel element supporting members [5]

Assemblies of plate-shaped fuel elements or coaxial tubes

Fuel units consisting of a single fuel element in a supporting sleeve

Structural combination of fuel element with thermoelectric element for direct production of electric energy from fission heat (for temperature measurement G21C 17/10)

Selection of substances for use as reactor fuel

Fluid or fluent reactor fuel

Aqueous compositions

True or colloidal solutions of the active constituent

Suspensions of the active constituent; Slurries

Liquid metal compositions

Fused salt, oxide, or hydroxide compositions

Gaseous compositions; Suspensions in a gaseous carrier

Solid reactor fuel

Metallic fuel; Intermetallic dispersions

Ceramic fuel

Ceramic dispersion fuel, e.g. cermet

Moderator or core structure; Selection of materials for use as moderator

Details

Spatial arrangements allowing for Wigner growth

Means for locating or supporting fuel elements

Means for preventing undesired asymmetric expansion of the complete structure

Means for supporting the complete structure

characterised by composition, e.g. the moderator containing additional substances which ensure improved heat resistance of the moderator

characterised by shape

Shape of its constituent parts

characterised by the provision of more than one active zone

wherein one zone contains fissile material and another zone contains breeder material

wherein one zone is a superheating zone

G21C 7/00 - G21C 17/14