Silicon mass transfer in sodium loops and the resulting/thermal hydraulic effects. [LMFBR]

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The element silicon in the surface of new, 300 series stainless steel has been shown to rapidly dissolve in sodium above 525/sup 0/C. It deposits in slightly cooler regions as a crystalline compound with sodium and oxygen. In tests, the deposits have caused increases in hydraulic friction factor (hence, increased pressure loss) of up to 300% at Reynolds Numbers of 14/sup 4/ to 10/sup 5/.Also, they have contributed to local losses of heat transfer rate to 1/10 the original value, at a Reynolds Number of approximately 10/sup 4/. The crystals quickly decompose when out of sodium. Measurements made with a … continued below

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23 pages

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Yunker, W.H. February 1, 1980.

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The element silicon in the surface of new, 300 series stainless steel has been shown to rapidly dissolve in sodium above 525/sup 0/C. It deposits in slightly cooler regions as a crystalline compound with sodium and oxygen. In tests, the deposits have caused increases in hydraulic friction factor (hence, increased pressure loss) of up to 300% at Reynolds Numbers of 14/sup 4/ to 10/sup 5/.Also, they have contributed to local losses of heat transfer rate to 1/10 the original value, at a Reynolds Number of approximately 10/sup 4/. The crystals quickly decompose when out of sodium. Measurements made with a sodium loop (volume = 0.42 m/sup 3/) include compound solubility vs temperature, loop conditions vs source rates and deposit transfer rates. Laboratory examinations and analyses of the crystals have also been made. The effects of this material have been observed also in a number of other loops. With the data from these studies, such effects are now explained and can be controlled or eliminated by system design and operation.

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23 pages

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NTIS, PC A02/MF A01.

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  • 2. international conference of liquid metal technology for energy systems, Richland, WA, USA, 20 Apr 1980

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  • Report No.: HEDL-SA-1897-FP
  • Report No.: CONF-800401-17
  • Grant Number: AC14-76FF02170
  • Office of Scientific & Technical Information Report Number: 5194132
  • Archival Resource Key: ark:/67531/metadc1057093

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  • February 1, 1980

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  • Jan. 22, 2018, 7:23 a.m.

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  • Jan. 19, 2021, 7:20 p.m.

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Yunker, W.H. Silicon mass transfer in sodium loops and the resulting/thermal hydraulic effects. [LMFBR], article, February 1, 1980; Richland, Washington. (https://digital.library.unt.edu/ark:/67531/metadc1057093/: accessed June 10, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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