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IPC 7
 
G21C-G21C00522
  G21C 7/00 - G21C 17/14  

SECTION G – PHYSICS


G 21NUCLEAR PHYSICS; NUCLEAR ENGINEERING


G 21 CNUCLEAR 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 



1/

00Reactors

1/

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

1/

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

1/

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

1/

04.Thermal reactors

1/

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

1/

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

1/

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

1/

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

1/

10....moderator and coolant being different or separated

1/

12.....moderator being solid, e.g. Magnox reactor

1/

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

1/

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

1/

18.....coolant being pressurised

1/

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

1/

22...using liquid or gaseous fuel

1/

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

1/

26...Single-region reactors

1/

28...Two-region reactors

1/

30.Subcritical reactors

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)  [3]


3/

00Reactor fuel elements or their assemblies; Selection of substances for use as reactor fuel elements

3/

02.Fuel elements

3/

04..Constructional details

3/

06...Casings; Jackets

3/

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

3/

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

3/

10....End closures

3/

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

3/

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

3/

16...Details of the construction within the casing

3/

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

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)

3/

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

3/

22..with fissile or breeder material in contact with coolant

3/

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

3/

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

3/

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

3/

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

3/

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

3/

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

3/

324...Coats or envelopes for the bundles  [5]

3/

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

3/

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

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  [5]

3/

332....Supports for spacer grids  [5]

3/

334...Assembling the bundles  [5]

3/

335...Exchanging elements in irradiated bundles  [5]

3/

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

3/

338....Helicoidal spacer elements  [5]

3/

34...Spacer grids

3/

344....formed of assembled tubular elements  [5]

3/

348....formed of assembled non-intersecting strips  [5]

3/

352....formed of assembled intersecting strips  [5]

3/

356....being provided with fuel element supporting members  [5]

3/

36..Assemblies of plate-shaped fuel elements or coaxial tubes

3/

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

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)

3/

42.Selection of substances for use as reactor fuel

3/

44..Fluid or fluent reactor fuel

3/

46...Aqueous compositions

3/

48....True or colloidal solutions of the active constituent

3/

50....Suspensions of the active constituent; Slurries

3/

52...Liquid metal compositions

3/

54...Fused salt, oxide, or hydroxide compositions

3/

56...Gaseous compositions; Suspensions in a gaseous carrier

3/

58..Solid reactor fuel

3/

60...Metallic fuel; Intermetallic dispersions

3/

62...Ceramic fuel

3/

64....Ceramic dispersion fuel, e.g. cermet


5/

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

5/

02.Details

5/

04..Spatial arrangements allowing for Wigner growth

5/

06..Means for locating or supporting fuel elements

5/

08..Means for preventing undesired asymmetric expansion of the complete structure

5/

10..Means for supporting the complete structure

5/

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

5/

14.characterised by shape

5/

16..Shape of its constituent parts

5/

18.characterised by the provision of more than one active zone

5/

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

5/

22..wherein one zone is a superheating zone

   G21C 7/00 - G21C 17/14  
 

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