| 976 / | HD | NUCLEAR TECHNOLOGY |
| DIG 306 | DD | ARRANGEMENTS OF REACTOR AND ENGINE IN WHICH REACTOR-PRODUCED HEAT IS CONVERTED INTO MECHANICAL ENERGY [G21D-5/00] {2} |
| DIG 308 | DD | .~ Reactor and engine not structurally combined [G21D-5/04] {2} |
| DIG 310 | DD | .~.~ With engine working medium heated in a heat exhanger by the reactor coolant [G21D-5/08] {2} |
| DIG 311 | | .~.~.~ Liquid working medium partially heated by reactor and vaporized by heat source external to the core (e.g., with oil heating) [G21D-5/10] |