Cooperative Patent Classification

CPC Definition - Subclass G21D

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Last Updated Version: 2016.11
NUCLEAR POWER PLANT (electric or magnetic analogue computers, e.g. simulators, for nuclear physics G06G 7/54)
Definition statement

This place covers:

Aspects of power plants which include, as a power generator, a nuclear fission reactor. Also power plants which convert the heat produced by the fission reaction into forms of energy other than electricity (e.g. mechanical energy).

References
Limiting references

This place does not cover:

Nuclear fusion reactors

Aspects related to nuclear fission reactors per se

Structural combination of fuel element with thermoelectric element

Control of nuclear reaction

Emergency protection arrangements structurally associated with a reactor; for rapid reduction of reactivity under fault conditions; for suppressing fires

Pumping arrangements for the coolant by means within the reactor pressure vessel

Obtaining electrical energy from radioactive sources

Nuclear explosives and their applications

Informative references

Attention is drawn to the following places, which may be of interest for search:

Electric or magnetic analogue computers, e.g. simulators, for nuclear physics

Thermoelectric elements per se

Electrodynamic pumps

Special rules of classification

Classification of both important (invention) information and additional information is obligatory.

The following Indexing Codes do not follow the general EC/Indexing Code parallel scheme but are used to classify additional invention information for which an EC class is presently not available: G21D 2003/002, G21D 2003/004, G21D 2003/005. If appropriate, these Indexing Codes must be assigned if the corresponding EC subgroup is given, i.e. if G21D 3/001 is assigned.

Glossary of terms

In this place, the following terms or expressions are used with the meaning indicated:

Engine

plant, such as turbine

Engine demand

load

Details of nuclear power plant (control G21D 3/00)
Definition statement

This place covers:

Details of the nuclear power plant, other than details of the nuclear reactor per se.

References
Limiting references

This place does not cover:

Control of nuclear power plant

Informative references

Attention is drawn to the following places, which may be of interest for search:

Pumps for liquids per se

Dismantling spent nuclear fuel

{primary side of steam generators (secondary side of steam generators F22B 1/00, F22B 35/00 or F22B 37/00)}
Definition statement

This place covers:

Steam generator replacements.

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Secondary side of steam generators

Control of nuclear power plant (control of nuclear reaction in general G21C 7/00)
Definition statement

This place covers:

Aspects of the control of nuclear power plants, other than the control of the nuclear fission reaction per se.

References
Limiting references

This place does not cover:

Control of nuclear reaction

Emergency protection structurally associated with the reactor

Emergency cooling arrangements (primary circuit)

Informative references

Attention is drawn to the following places, which may be of interest for search:

Electrical digital data processing

Analog computers

{Computer implemented control}
Definition statement

This place covers:

Computer implemented systems and methods related to nuclear reactor applications, such as design, licensing procedures, fuel shuffling, core loading patterns, data processing, etc.

Special rules of classification

When this class is assigned, if appropriate, an additional Indexing Code amongst G21D 2003/002, G21D 2003/004 and G21D 2003/005 should also be assigned.

Arrangements of reactor and engine in which reactor-produced heat is converted into mechanical energy
Definition statement

This place covers:

Nuclear propulsion, e.g. for applications in ships, submarines and space crafts.

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Arrangements or adaptations of propulsion systems of cosmonautic vehicles

Plants characterised by the use of steam or heat accumulators using nuclear heat;

Gas-turbine plants characterised by the use of hot gases or unheated pressurised gases using nuclear energy

Arrangements for direct production of electric energy from fusion or fission reactions (obtaining electric energy from radioactive sources G21H 1/00)
References
Limiting references

This place does not cover:

Obtaining energy from radioactive sources

Arrangements to provide heat for purposes other than conversion into power, e.g. for heating buildings
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Methods and apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells by means of nuclear energy