| 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 | DD | .~ Fast fission reactors (i.e., reactors not using a moderator; metal cooled reactors; fast breeders) [G21C-1/02] {3} |
| DIG 12 | | .~.~ Characterized by the concept and properties of the core [G21C-1/02B] {1} |
| DIG 13 | DD | .~.~.~> Where the core is divided into zones with fuel and zones with breeding material [G21C-1/02B2] |