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IPC 7
  G21C - G21C 5/22  
G21C00700-G21C01714
  G21C 19/00 - G21C 23/00  

SECTION G – PHYSICS


G 21NUCLEAR PHYSICS; NUCLEAR ENGINEERING


G 21 CNUCLEAR REACTORS (analogue computers therefor G06G 7/54; fusion reactors G21B; nuclear explosives G21J)


7/

00Control of nuclear reaction

7/

02.by using self-regulating properties of reactor materials (arrangements that involve temperature stability G21C 7/32)

7/

04..of burnable poisons (burnable poisons in fuel rods G21C 3/326)  [5]

7/

06.by application of neutron-absorbing material, i.e. material with absorption cross-section very much in excess of reflection cross-section

7/

08..by displacement of solid control elements, e.g. control rods

7/

10...Construction of control elements

7/

103....Control assemblies containing one or more absorbants as well as other elements, e.g. fuel or moderator elements  [5]

7/

107....Control elements adapted for pebble-bed reactors  [5]

7/

11....Deformable control elements, e.g. flexible, telescopic, articulated  [5]

7/

113....Control elements made of flat elements; Control elements having cruciform cross-section  [5]

7/

117....Clusters of control rods; Spider construction  [5]

7/

12...Means for moving control elements to desired position (dropping rods in an emergency G21C 9/02)

7/

14....Mechanical drive arrangements

7/

16....Hydraulic or pneumatic drive arrangements

7/

18...Means for obtaining differential movement of control elements

7/

20...Disposition of shock-absorbing devices (shock-absorbers in general F16F)

7/

22..by displacement of a fluid or fluent neutron-absorbing material

7/

24..Selection of substances for use as neutron-absorbing material

7/

26.by displacement of the moderator or parts thereof

7/

27..Spectral shift control  [5]

7/

28.by displacement of the reflector or parts thereof

7/

30.by displacement of reactor fuel or fuel elements

7/

32.by varying flow of coolant through the core

7/

34.by utilisation of a primary neutron source

7/

36.Control circuits


9/

00Emergency protection arrangements structurally associated with the reactor (emergency cooling arrangements G21C 15/18)

9/

004.Pressure suppression  [5]

9/

008..by rupture-discs or -diaphragms  [5]

9/

012..by thermal accumulation or by steam condensation, e.g. ice condensers  [5]

9/

016.Core catchers  [5]

9/

02.Means for effecting very rapid reduction of the reactivity factor under fault conditions, e.g. reactor fuse

9/

027..by fast movement of a solid, e.g. pebbles  [5]

9/

033..by an absorbent fluid  [5]

9/

04.Means for suppressing fires

9/

06..Means for preventing accumulation of explosives gases, e.g. recombiners  [5]


11/

00Shielding structurally associated with the reactor

11/

02.Biological shielding (in general G21F)

11/

04..on waterborne craft

11/

06.Reflecting shields, i.e. for minimising loss of neutrons

11/

08.Thermal shields; Thermal linings, i.e. for dissipating heat from gamma radiation which would otherwise heat an outer biological shield


13/

00Pressure vessels; Containment vessels; Containment in general (for chemical or physical processes B01J 3/00; pressure vessels in general F16J 12/00)

13/

02.Details

13/

024..Supporting constructions for pressure vessels or containment vessels  [5]

13/

028..Seals, e.g. for pressure vessels or containment vessels  [5]

13/

032..Joints between tubes and vessel walls, e.g. taking into account thermal stresses  [5]

13/

036...the tube passing through the vessel wall, i.e. continuing on both sides of the wall  [5]

13/

04..Arrangements for expansion and contraction

13/

06..Sealing-plugs (for pressure vessels in general F16J 13/00)

13/

067...for tubes, e.g. standpipes; Locking devices for plugs  [5]

13/

073...Closures for reactor-vessels, e.g. rotatable  [5]

13/

08.Vessels characterised by the material; Selection of materials for pressure vessels

13/

087..Metallic vessels  [5]

13/

093..Concrete vessels  [5]

13/

10.Means for preventing contamination in event of leakage


15/

00Cooling arrangements within the pressure vessel containing the core; Selection of specific coolants

15/

02.Arrangement or disposition of passages in which heat is transferred to the coolant, e.g. for coolant circulation through the supports of the fuel elements

15/

04..from fissile or breeder material

15/

06...in fuel elements

15/

08..from moderating material

15/

10..from reflector or thermal shield

15/

12..from pressure vessel; from containment vessel

15/

14..from ducts conducting a hot fluid; from ducts comprising auxiliary apparatus, e.g. pumps, cameras

15/

16.comprising means for separating liquid and steam (separating in general B01D; steam traps F16T)

15/

18.Emergency cooling arrangements; Removing shut-down heat

15/

20.Partitions or thermal insulation between fuel channel and moderator, e.g. in pressure tube reactors

15/

22.Structural association of coolant tubes with headers or other pipes, e.g. in pressure tube reactors (joints of tubes in general F16L)  [4]

15/

24.Promoting flow of the coolant (electrodynamic pumps H02K 44/02)

15/

243..for liquids  [5]

15/

247...for liquid metals  [5]

15/

25...using jet pumps  [5]

15/

253..for gases, e.g. blowers  [5]

15/

257..using heat-pipes  [5]

15/

26..by convection, e.g. using chimneys, using divergent channels

15/

28.Selection of specific coolants (if serving as the moderator G21C 5/12; heat-transfer or heat-exchange materials C09K 5/00)


17/

00Monitoring; Testing (measuring in general G01)

17/

003.Remote inspection of vessels, e.g. pressure vessels  [5]

17/

007..Inspection of the outer surfaces of vessels  [5]

17/

01..Inspection of the inner surfaces of vessels  [5]

17/

013..Inspection vehicles  [5]

17/

017.Inspection or maintenance of pipe-lines or tubes in nuclear installations  [5]

17/

02.Devices or arrangements for monitoring coolant or moderator

17/

022..for monitoring liquid coolants or moderators  [5]

17/

025...for monitoring liquid metal coolants  [5]

17/

028..for monitoring gaseous coolants  [5]

17/

032..Reactor-coolant flow measuring or monitoring  [5]

17/

035..Moderator- or coolant-level detecting devices  [5]

17/

038..Boiling detection in moderator or coolant  [5]

17/

04..Detecting burst slugs

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)

17/

07..Leak testing  [5]

17/

08.Structural combination of reactor core or moderator structure with viewing means, e.g. with television camera, periscope, window

17/

10.Structural combination of fuel element, control rod, reactor core, or moderator structure with sensitive instruments, e.g. for measuring radioactivity, strain

17/

104..Measuring reactivity  [5]

17/

108..Measuring reactor flux  [5]

17/

112..Measuring temperature  [5]

17/

116..Passages or insulators, e.g. for electric cables  [5]

17/

12..Sensitive element forming part of control element

17/

14.Period meters

  G21C - G21C 5/22    G21C 19/00 - G21C 23/00  
 

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