Enhanced glass-to-metal feedthroughs will be used to carry key instrumentation and control (I&C) signals in China’s high-temperature gas-cooled pebble-bed modular reactor (HTR-PM) at Shidaowan, and in SMR prototyping. Chinergy Co., Ltd and Jiamusi Electric Machine Co., Ltd will use the feedthroughs, also called electrical penetration assemblies (EPAs) at the Shidaowan twin-reactor HTR, which have undergone a specialized manufacturing process to make them far more robust than organic feedthroughs. SCHOTT EPAs are the only feedthrough that can be used in the primary loop of an HTR because organic seals cannot withstand the high temperature and pressures. Glass-to-metal seals are comprised of inorganic, non-aging material which have a virtually unlimited lifespan in high-temperature, high-radiation and high-pressure applications. This I&C technology package is being enhanced by development and testing of new mineral-insulated (MI) cable connectors and EPAs made of crystallizing glass ceramic combined with superalloys. The EPAs have a maintenance-free lifespan of up to 60 years, resulting in no outage time spent on these components and subsequently helps reduce costs associated with shutdown. They are far more robust than organic seals and provide increased safety at a lower lifetime cost. Due to this significant safety performance, the EPAs have also been chosen by BWXT for its mPower SMR. SMR requirements are very challenging but are met by the new components, which will form part of a strong I&C safety chain. Higher specification EPAs and MI cable connectors for equipment have been designed into advanced severe accident I&C instruments including advanced severe accident hydrogen and oxygen sensors that exceed the challenging requirements of both HTR and SMR applications.