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Curtiss-Wright has successfully tested high-temperature neutron flux detector prototypes that can operate at 800°C, surpassing the 600°C limit of current detectors used in the UK's AGR fleet. These fission ionization chambers are designed for Generation IV reactors and small modular reactors (SMRs), addressing challenges of higher temperatures and compact cores while ensuring accurate monitoring of neutron flux for safety and power level indications. The detectors feature a nickel alloy body and ceramic components for durability and electrical isolation, with confirmed stable performance in testing.