Thermal modeling of core sampling in flammable gas waste tanks. Part 1: Push-mode sampling

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The radioactive waste stored in underground storage tanks at Hanford site is routinely being sampled for waste characterization purposes. The push- and rotary-mode core sampling is one of the sampling methods employed. The waste includes mixtures of sodium nitrate and sodium nitrite with organic compounds that can produce violent exothermic reactions if heated above 160 C during core sampling. A self-propagating waste reaction would produce very high temperatures that eventually result in failure of the tank and radioactive material releases to environment. A two-dimensional thermal model based on a lumped finite volume analysis method is developed. The enthalpy of each ... continued below

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11 p.

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Unal, C.; Stroh, K. & Pasamehmetoglu, K.O. August 1, 1997.

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Description

The radioactive waste stored in underground storage tanks at Hanford site is routinely being sampled for waste characterization purposes. The push- and rotary-mode core sampling is one of the sampling methods employed. The waste includes mixtures of sodium nitrate and sodium nitrite with organic compounds that can produce violent exothermic reactions if heated above 160 C during core sampling. A self-propagating waste reaction would produce very high temperatures that eventually result in failure of the tank and radioactive material releases to environment. A two-dimensional thermal model based on a lumped finite volume analysis method is developed. The enthalpy of each node is calculated from the first law of thermodynamics. A flash temperature and effective contact area concept were introduced to account the interface temperature rise. No maximum temperature rise exceeding the critical value of 60 C was found in the cases studied for normal operating conditions. Several accident conditions are also examined. In these cases it was found that the maximum drill bit temperature remained below the critical reaction temperature as long as a 30 scfm purge flow is provided the push-mode drill bit during sampling in rotary mode. The failure to provide purge flow resulted in exceeding the limiting temperatures in a relatively short time.

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11 p.

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INIS; OSTI as DE97003397

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  • AICHE/ASME national heat transfer conference: current developments in numerical simulation of heat and mass transfer, Baltimore, MD (United States), 10-12 Aug 1997

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  • Other: DE97003397
  • Report No.: LA-UR--97-65
  • Report No.: CONF-970824--11
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 510325
  • Archival Resource Key: ark:/67531/metadc691030

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  • August 1, 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • Feb. 29, 2016, 7:52 p.m.

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Unal, C.; Stroh, K. & Pasamehmetoglu, K.O. Thermal modeling of core sampling in flammable gas waste tanks. Part 1: Push-mode sampling, article, August 1, 1997; New Mexico. (digital.library.unt.edu/ark:/67531/metadc691030/: accessed August 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.