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Accession Number
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DE2012-1055088
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Title
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Johnson Noise Thermometry for Advanced Small Modular Reactors.
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Publication Date
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Oct 2012
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Media Count
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16p
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Personal Author
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C. L. Britton D. E. Holcomb M. Roberts N. D. Bull R. T. Thomas
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Abstract
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Temperature is a key process variable at any nuclear power plant (NPP). The harsh reactor environment causes all sensor properties to drift over time. At the higher temperatures of advanced NPPs the drift occurs more rapidly. The allowable reactor operating temperature must be reduced by the amount of the potential measurement error to assure adequate margin to material damage. Johnson noise is a fundamental expression of temperature and as such is immune to drift in a sensors physical condition. In and near the core, only Johnson noise thermometry (JNT) and radiation pyrometry offer the possibility for long-term, high-accuracy temperature measurement due to their fundamental natures. Small Modular Reactors (SMRs) place a higher value on long-term stability in their temperature measurements in that they produce less power per reactor core and thus cannot afford as much instrument recalibration labor as their larger brethren. The purpose of the current ORNL-led project, conducted under the Instrumentation, Controls, and Human-Machine Interface (ICHMI) research pathway of the U.S. Department of Energy (DOE) Advanced SMR Research and Development (R&D) program, is to develop and demonstrate a drift free Johnson noise-based thermometer suitable for deployment near core in advanced SMR plants.
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Keywords
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Noise thermometer
Nuclear power plants
Nuclear reactors
Radiation pyrometry
Reactor cores
Research and development
Small modular reactors(SMRs)
Stability
Temperature measurement
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Source Agency
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Technical Information Center Oak Ridge Tennessee
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NTIS Subject Category
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77H - Reactor Engineering & Nuclear Power Plants
94K - Laboratory & Test Facility Design & Operation
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Corporate Author
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Oak Ridge National Lab., TN.
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Document Type
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Technical report
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Title Note
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N/A
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NTIS Issue Number
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1308
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Contract Number
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DE-AC05-00OR22725
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