Evaluation of prompt nucleation of bubbles in annular fuel elements during the initial depressurization transient of a DEGB LOCA

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In the first moments following the pipe break, of a DEGB LOCA, the depressurization wave is postulated to propagate rapidly through the system, in the manner of an acoustic or water hammer wave. this is immediately followed by a (reflected) repressurization wave, as the flow of coolant through the break is established. The pressure history is then dictated by the flow from the break and the ability of the pressurizer, pumps and accumulators to supply coolant. The initial sudden drop in pressure may result in the system pressure falling below the saturation pressure of the coolant. This could, in turn, ... continued below

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13 p.

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Smith, A.C. June 1, 1997.

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Description

In the first moments following the pipe break, of a DEGB LOCA, the depressurization wave is postulated to propagate rapidly through the system, in the manner of an acoustic or water hammer wave. this is immediately followed by a (reflected) repressurization wave, as the flow of coolant through the break is established. The pressure history is then dictated by the flow from the break and the ability of the pressurizer, pumps and accumulators to supply coolant. The initial sudden drop in pressure may result in the system pressure falling below the saturation pressure of the coolant. This could, in turn, result in bubble formation. Such immediate vapor formation (prompt nucleation of bubbles), in the period before the repressurization wave restores the system pressure to a level above the saturation pressure might initiate flow instability. Such an interruption in flow would allow the fuel tube clad temperature to increase rapidly. Depending on the duration of the flow interruption, the reactor might not be able to survive the initial moments of DEGB LOCA. It has generally been that this phenomenon would not actually occur in an operating reactor. The purpose of this investigation is to evaluate the possibility of occurrence of bubble formation as a result of initial depressurization. 7 refs., 6 figs.

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13 p.

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OSTI as DE97060089

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  • International mechanical engineering congress and exposition, Dallas, TX (United States), 16-21 Nov 1997

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  • Other: DE97060089
  • Report No.: WSRC-MS--97-0201
  • Report No.: CONF-971115--2
  • Grant Number: AC09-96SR18500
  • Office of Scientific & Technical Information Report Number: 554174
  • Archival Resource Key: ark:/67531/metadc691307

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  • June 1, 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • Feb. 9, 2016, 8:29 p.m.

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Smith, A.C. Evaluation of prompt nucleation of bubbles in annular fuel elements during the initial depressurization transient of a DEGB LOCA, article, June 1, 1997; Aiken, South Carolina. (digital.library.unt.edu/ark:/67531/metadc691307/: accessed November 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.