SCDAP/RELAP5 modeling of heat transfer and flow losses in lower head porous debris. Revision 1

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Designs are described for implementing models for calculating the heat transfer and flow losses in porous debris in the lower head of a reactor vessel. The COUPLE model in SCDAP/RELAP5 represents both the porous and nonporous debris that results from core material slumping into the lower head. Currently, the COUPLE model has the capability to model convective and radiative heat transfer from the surfaces of nonporous debris in a detailed manner and to model only in a simplistic manner the heat transfer from porous debris. In order to advance beyond the simplistic modeling for porous debris, designs are developed for ... continued below

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296 Kilobytes pages

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Siefken, L.J.; Coryell, E.W.; Paik, S. & Kuo, H. May 1, 1999.

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Description

Designs are described for implementing models for calculating the heat transfer and flow losses in porous debris in the lower head of a reactor vessel. The COUPLE model in SCDAP/RELAP5 represents both the porous and nonporous debris that results from core material slumping into the lower head. Currently, the COUPLE model has the capability to model convective and radiative heat transfer from the surfaces of nonporous debris in a detailed manner and to model only in a simplistic manner the heat transfer from porous debris. In order to advance beyond the simplistic modeling for porous debris, designs are developed for detailed calculations of heat transfer and flow losses in porous debris. Correlations are identified for convective heat transfer in porous debris for the following modes of heat transfer; (1) forced convection to liquid, (2) forced convection to gas, (3) nucleate boiling, (4) transition boiling, and (5) film boiling. Interphase heat transfer is modeled in an approximate ma nner. Designs are described for models to calculate the flow losses and interphase drag of fluid flowing through the interstices of the porous debris, and to apply these variables in the momentum equations in the RELAP5 part of the code. Since the models for heat transfer and flow losses in porous debris in the lower head are designed for general application, a design is also described for implementation of these models to the analysis of porous debris in the core region. A test matrix is proposed for assessing the capability of the implemented models to calculate the heat transfer and flow losses in porous debris. The implementation of the models described in this report is expected to improve the COUPLE code calculation of the temperature distribution in porous debris and in the lower head that supports the debris. The implementation of these models is also expected to improve the calculation of the temperature and flow distribution in porous debris in the core region.

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296 Kilobytes pages

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INIS; OSTI as DE00751981

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  • Other Information: PBD: 1 May 1999

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  • Report No.: INEEL/EXT--98-00820(Rev.1)
  • Grant Number: AC07-94ID13223
  • DOI: 10.2172/751981 | External Link
  • Office of Scientific & Technical Information Report Number: 751981
  • Archival Resource Key: ark:/67531/metadc706157

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  • May 1, 1999

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  • Sept. 12, 2015, 6:31 a.m.

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  • July 19, 2016, 12:38 p.m.

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Siefken, L.J.; Coryell, E.W.; Paik, S. & Kuo, H. SCDAP/RELAP5 modeling of heat transfer and flow losses in lower head porous debris. Revision 1, report, May 1, 1999; Idaho Falls, Idaho. (digital.library.unt.edu/ark:/67531/metadc706157/: accessed December 16, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.