Seismic stabilized high rail cranes

Abstract From the Canadian patent

Cranes for polar or linear movement on highly elevated rails or runways as, for example, on the circular top of a containment tower building for a nuclear reactor and/or on the highly elevated linear tracks on top of the parallel walls of the turbine room adjacent such a containment tower hereinafter some-, times called high-rail cranes which cranes, if not protected, against earthquack shocks as transmitted and amplified by such towers and walls,could be injured and caused to drop their loads or trolleys or fall bodily from their supporting rails or runways. Such a calamitous failure would likely cause catastrophic damage to the nuclear reactor, and/or the fuel vessel or cask with, …