An Order-of-Magnitude Estimation of Benzene Concentration in Saltstone Vault

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The contents of Tank 48 that include the tetraphenylborate (TPB) precipitates of potassium and cesium will be grouted and stored in the Saltstone vault. The grouting process is exothermic, which should accelerate the decomposition of TPB precipitates eventually to benzene. Because the vault is not currently outfitted with an active ventilation system, there is a concern that a mixture of flammable gases may form in the vapor space of each cell filled with the curing grout. The purpose of this study was to determine if passive breathing induced by the diurnal oscillations of atmospheric pressure would provide any mitigating measure ... continued below

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ALEXANDER, CHOI February 28, 2005.

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The contents of Tank 48 that include the tetraphenylborate (TPB) precipitates of potassium and cesium will be grouted and stored in the Saltstone vault. The grouting process is exothermic, which should accelerate the decomposition of TPB precipitates eventually to benzene. Because the vault is not currently outfitted with an active ventilation system, there is a concern that a mixture of flammable gases may form in the vapor space of each cell filled with the curing grout. The purpose of this study was to determine if passive breathing induced by the diurnal oscillations of atmospheric pressure would provide any mitigating measure against potential flammability. Specifically, it was requested that a set of algorithms be developed that would predict the equilibrium concentration of benzene as a function of benzene generation rate, fill height, and the amplitude of the barometric pressure oscillations. These algorithms were to be derived based on several simplifying assumptions so that order of magnitude estimates could be made quickly for scoping purposes. This memo documents the resulting algorithms along with those key assumptions made. These algorithms were then applied to simulate several test cases, including the baseline case where the cell was filled to the maximum height of 25 ft at the bulk benzene generation rate of 3.4 g/hr.

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  • Other Information: PBD: 28 Feb 2005

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  • Report No.: WSRC-TR-2005-00071
  • Grant Number: AC09-96SR18500
  • DOI: 10.2172/839498 | External Link
  • Office of Scientific & Technical Information Report Number: 839498
  • Archival Resource Key: ark:/67531/metadc783607

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  • February 28, 2005

Added to The UNT Digital Library

  • Dec. 3, 2015, 9:30 a.m.

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  • May 5, 2016, 5:48 p.m.

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ALEXANDER, CHOI. An Order-of-Magnitude Estimation of Benzene Concentration in Saltstone Vault, report, February 28, 2005; South Carolina. (digital.library.unt.edu/ark:/67531/metadc783607/: accessed December 16, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.