Editor-Curated Robotics Industry Briefing - RobotToday

Wi-Fi That Can Withstand a Nuclear Reactor

Researchers at the Institute of Science Tokyo have developed a robust Wi-Fi receiver capable of functioning within the extreme conditions of a nuclear reactor, a breakthrough presented by graduate student Yasuto Narukiyo at the IEEE International Solid-State Circuits Conference in San Francisco this February. The receiver can withstand radiation doses of up to 500 kilograys, significantly exceeding the tolerance levels of typical electronics used in space. This innovation aims to enhance wireless communication for robots tasked with decommissioning nuclear reactors, a process that has become increasingly vital since the Fukushima Daiichi disaster in 2011. Currently, many robotic systems rely on cumbersome LAN cables, which can complicate operations in hazardous environments. With over 200 reactors expected to reach the end of their operational lives in the next two decades, the need for effective decommissioning solutions is pressing. To achieve radiation hardening, Narukiyo and his team modified the receiver's components, reduced the number of transistors, and adjusted their design to minimize vulnerability to radiation damage. They focused on optimizing the performance of PMOS and NMOS transistors, leading to a receiver that maintained comparable performance to standard Wi-Fi devices even after exposure to high radiation levels. Looking ahead, Narukiyo plans to enhance the receiver's capabilities and develop a transmitter for two-way communication, which presents additional challenges due to the high current requirements for Wi-Fi signal generation. The team is also investigating alternative semiconductor materials, such as diamond, to improve the transmitter's resilience.