| 976 / | HD | NUCLEAR TECHNOLOGY |
| DIG 139 | DD | EMERGENCY PROTECTION ARRANGEMENTS STRUCTALLY ASSOCIATED WITH THE REACTOR (e.g., safety valves provided with pressure equalization devices) [G21C-9/00] *** (emergency cooling arrangements DIG. 196) {6} |
| DIG 146 | DD | .~ Means for effecting very rapid reduction of the reactivity factor under fault conditions (e.g., reactor fuse, control elements having arrangements activated in an emergency) [G21C-9/02] *** (control elements, per se, DIG. 113+) {4} |
| DIG 150 | | .~.~ Rupture diaphragms [G21C-9/02H] |