| 976 / | HD | NUCLEAR TECHNOLOGY |
| DIG 244 | DD | ARRANGEMENTS FOR TREATING, FOR HANDLING, OR FOR FACILITATING THE HANDLING OF, FUEL OR OTHER MATERIALS WHICH ARE USED WITHIN THE REACTOR (e.g., within its pressure vessel) [G21C-19/00] {11} |
| DIG 259 | | .~ Arrangements for introducing object into the pressure vessel; Arrangements for handling objects within the pressure vessel; Arrangements for removing objects from the pressure vessel [G21C-19/20] {3} |
| DIG 260 | DD | .~.~> Arrangements for handling ball-form (i.e., pebble fuel) [G21C-19/20A] |
| DIG 261 | DD | .~.~> Interchanging of fuel elements in the core (fuel shuffling) [G21C-19/20B] |
| DIG 262 | DD | .~.~> Arrangements for obtaining access to the interior of a pressure vessel while the reactor is operating [G21C-19/22] {1} |