| G | SK | SECTION G — PHYSICS |
| G21 | USK | NUCLEONICS |
| G21 | KL | NUCLEAR PHYSICS; NUCLEAR ENGINEERING |
| G21D | UKL | NUCLEAR POWER PLANT (electric or magnetic analogue computers, e.g. simulators, for nuclear physics G06G 7/54) |
| G21D 1/00 | HGR | Details of nuclear power plant (control G21D 3/00) |
| G21D 1/02 | UGR1 | | . | Arrangements of auxiliary equipment |
|
| G21D 1/04 | UGR1 | | . | Pumping arrangements (by means within the reactor pressure vessel G21C 15/24; electrodynamic pumps H02K 44/02) |
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| G21D 3/00 | HGR | Control of nuclear power plant (control of nuclear reaction in general G21C 7/00) |
| G21D 3/02 | UGR1 | |
| G21D 3/04 | UGR1 | | . | Safety arrangements (emergency protection of reactor G21C 9/00) |
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| G21D 3/06 | UGR2 | | . . | responsive to faults within the plant (in the reactor G21C 9/00) |
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| G21D 3/08 | UGR1 | | . | Regulation of any parameters in the plant |
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| G21D 3/10 | UGR2 | | . . | 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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| G21D 3/12 | UGR2 | | . . | by adjustment of the reactor in response only to changes in engine demand |
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| G21D 3/14 | UGR3 | | . . . | Varying flow of coolant |
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| G21D 3/16 | UGR3 | |
| G21D 3/18 | UGR2 | | . . | by adjustment of plant external to the reactor only in response to change in reactivity |
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| G21D 5/00 | HGR | Arrangements of reactor and engine in which reactor-produced heat is converted into mechanical energy |
| G21D 5/02 | UGR1 | | . | Reactor and engine structurally combined, e.g. portable |
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| G21D 5/04 | UGR1 | | . | Reactor and engine not structurally combined |
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| G21D 5/06 | UGR2 | | . . | with engine working medium circulating through reactor core |
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| G21D 5/08 | UGR2 | | . . | with engine working medium heated in a heat exchanger by the reactor coolant |
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| G21D 5/10 | UGR3 | | . . . | 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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| G21D 5/12 | UGR3 | | . . . | Liquid working medium vaporised by reactor coolant |
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| G21D 5/14 | UGR4 | | . . . . | and also superheated by reactor coolant |
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| G21D 5/16 | UGR4 | | . . . . | superheated by separate heat source |
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| G21D 7/00 | HGR | Arrangements for direct production of electric energy from fusion or fission reactions (obtaining electric energy from radioactive sources G21H 1/00) |
| G21D 7/02 | UGR1 | | . | using magneto-hydrodynamic generators |
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| G21D 7/04 | UGR1 | | . | using thermoelectric elements (structural combination of fuel element with thermoelectric element G21C 3/40; thermoelectric elements per seH01L 35/00, H01L 37/00) |
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| G21D 9/00 | HGR | Arrangements to provide heat for purposes other than conversion into power, e.g. for heating buildings |