[en] A kind of protect device is elaborated. It is composed of the weight sensor, the remote control, the receiver and the execution electric circuit. It can monitor long-distance range operation in the high radioactive situation, ensure irradiated targets against from broke process of coming in or out from reactor-core. It is effective to ensure irradiated targets in appropriate position, too. If traveling crane pulled over proper value during Irradiated Targets come out from Reactor-core, the pull-pole moving distance will reflect overweight degree. When appearing abnormity thing, e.g. Irradiated Targets is locked by Irradiated hole, spring compressed, the pull-pole down, when pressure of spring equal to puissance of initialization, bump-head on pull-hole strike switch. Then control-system of traveling crane stop hook rides and give an alarm, so it can protect Irradiated Targets can't be broke. (authors)