Sensitivity of BWR stability calculations to numerical integration techniques

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Computer simulations have shown that stability calculations in boiling water reactors (BWRs) are very sensitive to a number of input parameters, modeling assumptions, and numerical integration techniques. Following the 1988 LaSalle instability event, a significant industry-wide effort was invested in identifying these sensitivities. One major conclusion from these studies was that existing time-domain codes could best predict BWR stability by using explicit methods for the energy equation with a Courant number as close to unity as possible. This paper presents a series of sensitivity studies using simplified models, which allow us to determine the effect that different numerical integration techniques ... continued below

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9 p.

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Peiro, D. G. & March-Leuba, J. November 1, 1997.

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  • Peiro, D. G. Universidad Politecnica de Valencia (Spain). Departamento de Matematica Aplicada
  • March-Leuba, J. Oak Ridge National Lab., TN (United States)

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Computer simulations have shown that stability calculations in boiling water reactors (BWRs) are very sensitive to a number of input parameters, modeling assumptions, and numerical integration techniques. Following the 1988 LaSalle instability event, a significant industry-wide effort was invested in identifying these sensitivities. One major conclusion from these studies was that existing time-domain codes could best predict BWR stability by using explicit methods for the energy equation with a Courant number as close to unity as possible. This paper presents a series of sensitivity studies using simplified models, which allow us to determine the effect that different numerical integration techniques have on the results of stability calculations. The present study appears to indicate that, even though using explicit integration with a Courant number of one is adequate for existing codes using time-integration steps of less than 10 ms, second-order solution techniques for the time integration can result in significant improvements in the accuracy of linear (i.e., decay ratio) stability calculations.

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9 p.

Notes

OSTI as DE98001056

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  • 25. water reactor safety information meeting, Bethesda, MD (United States), 20-22 Oct 1997

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  • Other: DE98001056
  • Report No.: ORNL/CP--94956
  • Report No.: CONF-9710101--
  • Grant Number: AC05-96OR22464
  • Office of Scientific & Technical Information Report Number: 548854
  • Archival Resource Key: ark:/67531/metadc694152

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Office of Scientific & Technical Information Technical Reports

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  • November 1, 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • May 18, 2016, 2:32 p.m.

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Peiro, D. G. & March-Leuba, J. Sensitivity of BWR stability calculations to numerical integration techniques, article, November 1, 1997; Tennessee. (digital.library.unt.edu/ark:/67531/metadc694152/: accessed June 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.