Johnson Noise Thermometry for Advanced Small Modular Reactors

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Description

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 sensor’s 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 ... continued below

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Britton, C.L.,Jr.; Roberts, M.; Bull, N.D.; Holcomb, D.E. & Wood, R.T. September 15, 2012.

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  • Oak Ridge National Laboratory
    Publisher Info: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
    Place of Publication: Oak Ridge, Tennessee

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Description

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 sensor’s 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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  • Report No.: ORNL/TM-2012/346
  • Report No.: SMR/ICHMI/ORNL/TR-2012/01
  • Grant Number: DE-AC05-00OR22725
  • DOI: 10.2172/1054146 | External Link
  • Office of Scientific & Technical Information Report Number: 1054146
  • Archival Resource Key: ark:/67531/metadc827703

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Creation Date

  • September 15, 2012

Added to The UNT Digital Library

  • May 19, 2016, 9:45 a.m.

Description Last Updated

  • June 9, 2016, 9:06 p.m.

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Britton, C.L.,Jr.; Roberts, M.; Bull, N.D.; Holcomb, D.E. & Wood, R.T. Johnson Noise Thermometry for Advanced Small Modular Reactors, report, September 15, 2012; Oak Ridge, Tennessee. (digital.library.unt.edu/ark:/67531/metadc827703/: accessed November 14, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.