G21D NUCLEAR POWER PLANT
Introduced: September 1968
Description
G21D covers the overall design, construction, and operation of nuclear power plants as integrated systems for generating electrical power through nuclear fission. This includes plant layout, control systems, safety mechanisms, heat transfer arrangements, and the interconnection of reactor vessels with steam generators, turbines, and auxiliary systems. The classification encompasses both pressurized water reactors (PWR) and boiling water reactors (BWR) configurations, as well as related plant engineering aspects. Excluded are detailed aspects of reactor cores themselves (G21C), radioactive waste handling (G21F), and non-power nuclear installations.
Additional Content IPC
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
IPC and CPC are identically structured here. All 5 subcodes exist in both systems.
3 shared codes have differing titles between IPC and CPC.
Child Classifications
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- G21D 3/00 Control of nuclear power plant (control of nuclear reaction in general G21C7/00) +3 CPC IPC+CPC Available in IPC and CPC
- G21D 5/00 Arrangements of reactor and engine in which reactor-produced heat is converted into mechanical energy IPC+CPC Available in IPC and CPC
- G21D 7/00 Arrangements for direct production of electric energy from fusion or fission reactions (obtaining electric energy from radioactive sources G21H1/00) IPC+CPC Available in IPC and CPC
- G21D 9/00 Arrangements to provide heat for purposes other than conversion into power, e.g. for heating buildings IPC+CPC Available in IPC and CPC
Top Applicants
Top Applicants (IPC)
Class G21,2013–2023, worldwide · Source: EPO PATSTAT
- CHINA GENERAL NUCLEAR POWER CORPORATION 2,364
- CGN POWER COMPANY 1,899
- CHINA NUCLEAR POWER ENGINEERING COMPANY 1,870
- NUCLEAR POWER INSTITUTE OF CHINA 1,517
- KOREA ATOMIC ENERGY RESEARCH INSTITUTE KR 1,367
- WESTINGHOUSE ELECTRIC CORPORATION US 1,295
- KOREA HYDRO & NUCLEAR POWER COMPANY KR 1,196
- CHINESE ACADEMY OF SCIENCES 1,044
- CHINA INSTITUTE OF ATOMIC ENERGY 1,011
- HITACHI-GE NUCLEAR ENERGY 955
Top Applicants (CPC)
Class G21,2013–2023, worldwide · Source: EPO PATSTAT
- CHINA GENERAL NUCLEAR POWER CORPORATION 1,383
- WESTINGHOUSE ELECTRIC CORPORATION US 1,347
- KOREA ATOMIC ENERGY RESEARCH INSTITUTE KR 1,303
- CGN POWER COMPANY 1,156
- CHINA NUCLEAR POWER ENGINEERING COMPANY 1,149
- KOREA HYDRO & NUCLEAR POWER COMPANY KR 1,146
- NUCLEAR POWER INSTITUTE OF CHINA 1,086
- CHINESE ACADEMY OF SCIENCES 765
- CEA (COMMISSARIAT A L'ENERGIE ATOMIQUE) FR 763
- CHINA INSTITUTE OF ATOMIC ENERGY 659