Article

Curtiss-Wright has tested prototypes of a high-temperature neutron flux detector capable of operating at 800°C, suitable for Generation IV reactors and small modular reactors (SMRs). These fission ionization chambers extend the operational range beyond the 600°C limit of existing detectors used in the UK's AGR fleet.

The new detectors are designed to address challenges posed by higher operating temperatures and compact reactor cores, essential for monitoring neutron flux, which indicates reactor power levels and safety. The detector features a nickel alloy body for heat resistance, with ceramic components providing electrical isolation, and utilizes a proprietary triaxial mineral-insulated cable for signal integrity. Prototypes underwent testing at Curtiss-Wright's facilities and a third-party research reactor, confirming stable performance and a linear response to neutron flux levels up to approximately 5 × 10¹¹ nv.