Miniature fission chamber and signal cable assembly

摘要

A fission chamber assembly for use in-core of a nuclear reactor with the fission chamber included within a small diameter tubular housing which is hermetically sealed at opposed ends. A signal cable end seal assembly is provided at one end of the tubular housing serving to hermetically seal the mineral insulated coaxial signal cable to the tubular housing. A second cable end seal assembly is included within the tubular housing between the signal cable end seal assembly and the fission chamber, with a hermetically sealed gas-filled reservoir defined between the spaced-apart cable end seal assemblies. These redundant seal assemblies provide an improved reliability detector for use in the reactor hostile environment.