Skip over navigation
NUCLEAR POWER PLANT (electric or magnetic analogue computers, e.g. simulators, for nuclear physics G06G 7/54)
Definition statement
This subclass/group 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 relevant to classification in this subclass
This subclass/group 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 within this subclass

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 subclass/group, 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 subclass/group covers:

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

References relevant to classification in this group
This subclass/group 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
F04
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 subclass/group covers:

Steam generator replacements.

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 subclass/group covers:

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

References relevant to classification in this group
This subclass/group 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
[N: Computer implemented control]
Definition statement
This subclass/group 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 within this group

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 subclass/group covers:

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

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 relevant to classification in this group
This subclass/group does not cover:
Obtaining energy from radioactive sources
Arrangements to provide heat for purposes other than conversion into power, e.g. for heating buildings
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
This page is owned by Office of Patent Classification.
Last Modified: 10/11/2013