Cracked pellet gap conductance model: comparison of FRAP-S calculations with measured fuel centerline temperatures

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Fuel pellets crack extensively upon irradiation due both to thermal stresses induced by power changes and at high burnup, to accumulation of gaseous fission products at grain boundaries. Therefore, the distance between the fuel and cladding will be circumferentially nonuniform; varying between that calculated for intact operating fuel pellets and essentially zero (fuel segments in contact with the cladding wall). A model for calculation of temperatures in cracked pellets is proposed wherein the effective fuel to cladding gap conductance is calculated by taking a zero pressure contact conductance in series with an annular gap conductance. Comparisons of predicted and measured ... continued below

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20 p.

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MacDonald, P.E. & Broughton, J.M. March 1, 1975.

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  • Aerojet Nuclear Company
    Publisher Info: Aerojet Nuclear Co., Idaho Falls, Idaho (USA)
    Place of Publication: Idaho Falls, Idaho

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Description

Fuel pellets crack extensively upon irradiation due both to thermal stresses induced by power changes and at high burnup, to accumulation of gaseous fission products at grain boundaries. Therefore, the distance between the fuel and cladding will be circumferentially nonuniform; varying between that calculated for intact operating fuel pellets and essentially zero (fuel segments in contact with the cladding wall). A model for calculation of temperatures in cracked pellets is proposed wherein the effective fuel to cladding gap conductance is calculated by taking a zero pressure contact conductance in series with an annular gap conductance. Comparisons of predicted and measured fuel centerline temperatures at beginning of life and at extended burnup are presented in support of the model. 13 references. (auth)

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20 p.

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Dep. NTIS

Source

  • OECD halden reactor project conference, Geilo, Norway, 17 Mar 1975

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  • Report No.: CONF-750360--2
  • Grant Number: AT(10-1)-1375
  • Office of Scientific & Technical Information Report Number: 4158089
  • Archival Resource Key: ark:/67531/metadc870522

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Office of Scientific & Technical Information Technical Reports

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  • March 1, 1975

Added to The UNT Digital Library

  • Sept. 16, 2016, 12:32 a.m.

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  • Oct. 26, 2017, 3:21 p.m.

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MacDonald, P.E. & Broughton, J.M. Cracked pellet gap conductance model: comparison of FRAP-S calculations with measured fuel centerline temperatures, article, March 1, 1975; Idaho Falls, Idaho. (digital.library.unt.edu/ark:/67531/metadc870522/: accessed November 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.