G - PHYSICS
G21 - NUCLEAR PHYSICS
G21C - NUCLEAR REACTORS
Y - NEW / CROSS SECTIONAL TECHNOLOGIES
Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
Y02E - REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
G - PHYSICS
G21 - NUCLEAR PHYSICS
G21C - NUCLEAR REACTORS
G21C1/12 - moderator being solid, e.g. Magnox reactor {or gas-graphite reactor}
G21C3/06 - Casings
G21C3/16 - Details of the construction within the casing
G21C3/18 - Internal spacers or other non-active material within the casing, e.g. compensating for expansion of fuel rods or for compensating excess reactivity
G21C3/20 - with coating on fuel or on inside of casing
G21C3/32 - Bundles of parallel pin-, rod-, or tube-shaped fuel elements
G21C3/33 - Supporting or hanging of elements in the bundle
G21C3/64 - Ceramic dispersion fuel, e.g. cermet
Y - NEW / CROSS SECTIONAL TECHNOLOGIES
Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
Y02E - REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
Y02E30/30 - Nuclear fission reactors