Reactor Instrumentation & Control
Neutron Flux Detection
Logo

Neutron Flux Detection

sensorsUltra offers a wide range of neutron flux detectors designed for use in reactor safety and indication systems. These cover operation from start-up to full power with detectors available to operate in pulse mode, (start-up), direct current ion chamber mode (full power) and Campbelling or variance mode (provides wide range cover). To achieve this coverage, the gas fillings and neutron sensitive coatings of enriched boron or enriched uranium are chosen to meet user requirements. Devices are available in a range of sizes and for differing environments. These range from detectors designed to operate ex-core at temperatures up to 180 ºF (80 ºC) to those designed and certified for operation in-core at temperatures up to 1020 ºF (550 ºC) and at pressures up to 650 psi (50 bar). A range of miniature detector types have also been designed and exported for use in both research and water reactors. Typically, the ex-core detectors are fitted with coaxial or triaxial polymer sheathed cables whereas the in-core high temperature variants are fitted with mineral insulated cables complete with integral sealed coldend terminations and connector assemblies. Further variations in the specific construction of the interconnecting cables are possible. The low temperature ex-core types can be fitted with PEEK radiation resistant cables and in-core variants can be fitted with colaminax mineral insulated cables (utilising laminated metallic shielding in the cable outer sheath) for those plant situations where very good electrical interference immunity is required.