| 976 / | HD | NUCLEAR TECHNOLOGY |
| DIG 99 | DD | MODERATOR OR CORE STRUCTURE; SELECTION OF MATERIALS FOR USE AS MODERATOR [G21C-5/00] {4} |
| DIG 110 | | .~ Characterized by the provision of more than one active zone [G21C-5/18] {2} |
| DIG 111 | DD | .~.~> Wherein one zone contains fissile material and another zone contains breeder material [G21C-5/20] |
| DIG 112 | DD | .~.~> Wherein one zone is a superheating zone [G21C-5/22] |