Vertical slip flow and flooding models in LOCA analysis

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Description

Vertical slip flow and flooding models have been incorporated in a version of the RELAP4 computer code in order to better model nuclear reactor coolant system phenomena during postulated large and small break loss-of-coolant accidents. Much of the complex hydrodynamic phenomena believed to occur during ECC injection, ECC bypass, liquid penetration into the downcomer, and lower plenum entrainment is multidimensional in nature leading to modeling difficulties when the present nonslip version of RELAP4 is used. Flooding type models in combination with vertical slip flow can be used to improve modeling of ECC bypass and liquid entrainment phenomena during reversed core ... continued below

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Pages: 27

Creation Information

Fischer, S.R. June 1, 1975.

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  • Aerojet-General Corporation
    Publisher Info: Aerojet-General Corp., Sacramento, Calif. (USA)
    Place of Publication: Sacramento, California

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Description

Vertical slip flow and flooding models have been incorporated in a version of the RELAP4 computer code in order to better model nuclear reactor coolant system phenomena during postulated large and small break loss-of-coolant accidents. Much of the complex hydrodynamic phenomena believed to occur during ECC injection, ECC bypass, liquid penetration into the downcomer, and lower plenum entrainment is multidimensional in nature leading to modeling difficulties when the present nonslip version of RELAP4 is used. Flooding type models in combination with vertical slip flow can be used to improve modeling of ECC bypass and liquid entrainment phenomena during reversed core flow. Applications to the analysis of core flow blockage phenomena also exist. Flooding used in this discussion denotes Wallis countercurrent type flooding phenomena which limits the maximum liquid downflow for a given vapor upflow. Flooding as used here does not refer to the deluge type reflood of a core. (auth)

Physical Description

Pages: 27

Notes

Dep. NTIS

Source

  • American Nuclear Society meeting, New Orleans, Louisiana, USA, 8 Jun 1975

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  • Report No.: CONF-750607--31
  • Grant Number: None
  • Office of Scientific & Technical Information Report Number: 4120578
  • Archival Resource Key: ark:/67531/metadc869873

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Creation Date

  • June 1, 1975

Added to The UNT Digital Library

  • Sept. 16, 2016, 12:32 a.m.

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  • Feb. 20, 2017, 12:26 p.m.

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Fischer, S.R. Vertical slip flow and flooding models in LOCA analysis, article, June 1, 1975; Sacramento, California. (digital.library.unt.edu/ark:/67531/metadc869873/: accessed September 26, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.