The Effect of Local Boiling on Pressure Drop and Flow Distribution in the Yankee Reactor Core

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Where local boiling can occur in a semi-open heterogeneous reactor core consisting of parallel flow channels, differences in the terms comprising the total pressure drop in the local boiling regions and in parallel adjacent regions canse flow redistribution in the reactor. This report covers the study of the effect of local boiling on the friction factor and momentum components of the total pressure drop. The local-boiling to single-phase friction factor ratio has a maximum value of 1.42 when a linear relationship is assumed between the enthalpy of the coolant and the friction factor ratio. Analytical and gaphical methods for determining ... continued below

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Pages: 59

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Bishop, A. A. & Berringer, R. August 29, 1958.

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Description

Where local boiling can occur in a semi-open heterogeneous reactor core consisting of parallel flow channels, differences in the terms comprising the total pressure drop in the local boiling regions and in parallel adjacent regions canse flow redistribution in the reactor. This report covers the study of the effect of local boiling on the friction factor and momentum components of the total pressure drop. The local-boiling to single-phase friction factor ratio has a maximum value of 1.42 when a linear relationship is assumed between the enthalpy of the coolant and the friction factor ratio. Analytical and gaphical methods for determining the region of the core in local boiling are developed. For a cylindrical reactor core similar to the Yanke reactor core the maximum possible region of the core in which local boiling should occur would be an ellipsoid whose surface is the locus of points of local boiling. In the Yankee core the maximum possible volume in local boiling is 10.4 cubic feet and 14.4 cubic feet in the first and second parameter studies, respectively. These volumes are 4.5% and 5.5% of the total volume of the core. The nature and mechanism of local boiling is discussed and its relation to the single phase and true two-phase pressure drop is reviewed. Flow redistribution out of the hot channel due to local boiling is 17.6% and 23.8% for the first and second parameter studies, respectively. The first parameter study is for a 392 megawatt reactor and the second parameter study is for a 482 megawatt reactor. (auth)

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Pages: 59

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  • Other Information: For Yankee Atomic Electric Co. Orig. Receipt Date: 31-DEC-59

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  • Report No.: YAEC-76
  • Grant Number: AT(30-3)-222, SUBCONTRACT NO. 1
  • DOI: 10.2172/4282034 | External Link
  • Office of Scientific & Technical Information Report Number: 4282034
  • Archival Resource Key: ark:/67531/metadc1016998

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Office of Scientific & Technical Information Technical Reports

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  • August 29, 1958

Added to The UNT Digital Library

  • Oct. 15, 2017, 10:09 p.m.

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  • Jan. 17, 2018, 2:56 p.m.

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Bishop, A. A. & Berringer, R. The Effect of Local Boiling on Pressure Drop and Flow Distribution in the Yankee Reactor Core, report, August 29, 1958; Pittsburgh, Pennsylvania. (digital.library.unt.edu/ark:/67531/metadc1016998/: accessed December 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.