| IPC 7 English version |
| G21D-G21D00900 |
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| SECTION G – PHYSICS |
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| G 21 | NUCLEAR PHYSICS; NUCLEAR ENGINEERING |
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| G 21 D | NUCLEAR POWER PLANT (electric or magnetic analogue computers, e.g. simulators, for nuclear physics G06G 7/54) |
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1/ | 00 | Details of nuclear power plant (control G21D 3/00) |
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1/ | 02 | . | Arrangements of auxiliary equipment |
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1/ | 04 | . | Pumping arrangements (by means within the reactor pressure vessel G21C 15/24; electrodynamic pumps H02K 44/02) |
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3/ | 00 | Control of nuclear power plant (control of nuclear reaction in general G21C 7/00) |
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3/ | 02 | . | Manual control |
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3/ | 04 | . | Safety arrangements (emergency protection of reactor G21C 9/00) |
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3/ | 06 | . | . | responsive to faults within the plant (in the reactor G21C 9/00) |
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3/ | 08 | . | Regulation of any parameters in the plant |
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3/ | 10 | . | . | by a combination of a variable derived from neutron flux with other controlling variables, e.g. derived from temperature, cooling flow, pressure |
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3/ | 12 | . | . | by adjustment of the reactor in response only to changes in engine demand |
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3/ | 14 | . | . | . | Varying flow of coolant |
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3/ | 16 | . | . | . | Varying reactivity |
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3/ | 18 | . | . | by adjustment of plant external to the reactor only in response to change in reactivity |
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5/ | 00 | Arrangements of reactor and engine in which reactor-produced heat is converted into mechanical energy |
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5/ | 02 | . | Reactor and engine structurally combined, e.g. portable |
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5/ | 04 | . | Reactor and engine not structurally combined |
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5/ | 06 | . | . | with engine working medium circulating through reactor core |
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5/ | 08 | . | . | with engine working medium heated in a heat exchanger by the reactor coolant |
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5/ | 10 | . | . | . | Liquid working medium partially heated by reactor and vaporised by heat source external to the core, e.g. with oil heating |
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5/ | 12 | . | . | . | Liquid working medium vaporised by reactor coolant |
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5/ | 14 | . | . | . | . | and also superheated by reactor coolant |
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5/ | 16 | . | . | . | . | superheated by separate heat source |
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7/ | 00 | Arrangements for direct production of electric energy from fusion or fission reactions (obtaining electric energy from radioactive sources G21H 1/00) |
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7/ | 02 | . | using magneto-hydrodynamic generators |
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7/ | 04 | . | using thermoelectric elements (structural combination of fuel element with thermoelectric element G21C 3/40; thermoelectric elements per se H01L 35/00, H01L 37/00) |
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9/ | 00 | Arrangements to provide heat for purposes other than conversion into power, e.g. for heating buildings |
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