US PATENT SUBCLASS 976 / DIG 139
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)


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976 /   HD   NUCLEAR TECHNOLOGY

DIG 139EMERGENCY 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 140  DD  .~> Pressure suppression [G21C-9/00B] {2}
DIG 143  DD  .~> Core catchers [G21C-9/00D]
DIG 144  DD  .~> Against explosions (e.g., blast shields) [G21C-9/00F]
DIG 145  DD  .~> Against Na- or Ka- reactions [G21C-9/00I]
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 151  DD  .~> Means for suppressing fires; Earthquake protection [G21C-9/04]