LONG-LIVED IN-CORE INSTRUMENTATION
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United States of America Patent
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Nov 9, 2017
app pub date -
Aug 13, 2015
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Oct 30, 2014
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A Disclosed is a long-lifespan in-core instrument having an extended lifespan due to an enhanced combustion lifespan of an emitter. A central tube and an outer sheath tube distanced from the outer circumferential surface of the central tube are provided. Self-powered neutron detectors are placed between the central tube and outer sheath tube. Each self-powered neutron detector includes an emitter of a material having a neutron reaction cross section that is comparatively smaller than that of rhodium. A background detector for compensating for the background noise signal; core exit thermocouples for detecting the core exit temperature; and filler wires filling in the space between the self-powered neutron detectors, background detector and core exit thermocouples are provided.
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