| 976 / | HD | NUCLEAR TECHNOLOGY |
| DIG 5 | DD | NUCLEAR REACTORS [G21C-1/00] *** (fusion reactors H05H-1/00; nuclear explosives DIG. 423; analogue computers therefor G06G-7/54) {4} |
| DIG 11 | | .~ Fast fission reactors (i.e., reactors not using a moderator; metal cooled reactors; fast breeders) [G21C-1/02] {3} |
| DIG 12 | DD | .~.~> Characterized by the concept and properties of the core [G21C-1/02B] {1} |
| DIG 14 | DD | .~.~> Cooled by a not essentially pressurized coolant (e.g., tub type) [G21C-1/02D] *** (cooling arrangements DIG. 187+) |
| DIG 15 | DD | .~.~> Cooled by a pressurized coolant [G21C-1/02F] *** (cooling arrangements DIG. 187+) |