The Role of Bubble-Size Equilibration in the Transient Behavior of Fission Gas

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Description

An explicit analysis of bubble-size equilibration by volume diffusion has been derived and incorporated into the FRAS2 code. This code was developed for mechanistic analysis of transient fission-gas behavior in LMFBR fuel, but had been limited by the approximation that the time required for bubble-size adjustment, following coalescence or changes in temperature or pressure, was negligible. The equilibration phenomenon is illustrated by several idealized examples. If the fuel temperature rises linearly with time, an isolated bubble will expand rapidly toward its equilibrium size only after the temperature reaches a critical value that depends on both bubble size and heating rate. ... continued below

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31 p. : charts

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Gruber, E. E. 1978?.

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  • Main Title: The Role of Bubble-Size Equilibration in the Transient Behavior of Fission Gas
  • Added Title: ANL (Series)
  • Added Title: Argonne National Laboratory Report ANL-78-36
  • Series Title: Argonne National Laboratory Reports

Description

An explicit analysis of bubble-size equilibration by volume diffusion has been derived and incorporated into the FRAS2 code. This code was developed for mechanistic analysis of transient fission-gas behavior in LMFBR fuel, but had been limited by the approximation that the time required for bubble-size adjustment, following coalescence or changes in temperature or pressure, was negligible. The equilibration phenomenon is illustrated by several idealized examples. If the fuel temperature rises linearly with time, an isolated bubble will expand rapidly toward its equilibrium size only after the temperature reaches a critical value that depends on both bubble size and heating rate. Conversely, if the temperature is reduced uniformly, an isolated bubble will shrink only until diffusion becomes too slow for further size change. The final size that is ''frozen in'' may be significantly larger than the final equilibrium size. Finally, isothermal equilibration following coalescence of two equal bubbles can be described conveniently in terms of relaxation times, which depend on bubble size and temperature. However, a complete picture of the role of equilibration in transient fission-gas behavior can only be gained through an investigation of the bubble-size distribution and its evolution. Such an investigation is carried out with the FRAS2 code, in which the explicit equilibration model is implemented. Since non-equilibrium bubbles in a thermal transient are generally over-pressured, the gas represents a source of energy that can conceivably disrupt the fuel. This ''dispersive potential'' is also calculated in the FRAS2 code.

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31 p. : charts

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  • OCLC: 883157244 | External Link
  • SuDoc Number: E 1.28:ANL-78-36
  • SuDoc Number: Y 3.AT 7:22/ANL-78-36
  • Report No.: ANL-78-36
  • Grant Number: W-31-109-Eng-38
  • Archival Resource Key: ark:/67531/metadc303741

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  • 1978?

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  • Aug. 4, 2015, 8:33 a.m.

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Gruber, E. E. The Role of Bubble-Size Equilibration in the Transient Behavior of Fission Gas, report, 1978?; Argonne, Illinois. (digital.library.unt.edu/ark:/67531/metadc303741/: accessed December 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.