Initiation Temperature for Runaway Tri-n-Butyl Phosphate/Nitric Acid Reaction

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During a review of the H-Canyon authorization basis, Defense Nuclear Facility Safety Board (DNFSB) staff members questioned the margin of safety associated with a postulated tri-n-butyl phosphate (TBP)/nitric acid runaway reaction due to the inadvertent heating of a canyon tank containing greater than 3000 lbs (1362 kg) of TBP. The margin of safety was partially based on experiments and calculations performed by the Actinide Technology Section (ATS) to support deletion of indication of tank agitation as a Safety Class System. In the technical basis for deletion of this system, ATS personnel conservatively calculated the equilibrium temperature distribution of a canyon ... continued below

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Rudisill, T.S. November 28, 2000.

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Description

During a review of the H-Canyon authorization basis, Defense Nuclear Facility Safety Board (DNFSB) staff members questioned the margin of safety associated with a postulated tri-n-butyl phosphate (TBP)/nitric acid runaway reaction due to the inadvertent heating of a canyon tank containing greater than 3000 lbs (1362 kg) of TBP. The margin of safety was partially based on experiments and calculations performed by the Actinide Technology Section (ATS) to support deletion of indication of tank agitation as a Safety Class System. In the technical basis for deletion of this system, ATS personnel conservatively calculated the equilibrium temperature distribution of a canyon tank containing TBP and nitric acid layers which were inadvertently heated by a steam jet left on following a transfer. The maximum calculated temperature (128 degrees C) was compared to the minimum initiation temperature for a runaway reaction (greater than 130 degrees C) documented by experimental work in the mid 195 0s. In this work, the initiation temperature as a function of nitric acid concentration was measured for 0 and 20 wt percent dissolved solids. The DNFSB staff members were concerned that data for 0 wt percent dissolved solids were not conservative given the facts that data for 20 wt percent dissolved solids show initiation temperatures at or below 130 degrees C and H-Canyon solutions normally contained a small amount of dissolved solids.

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Medium: P; Size: vp.

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INIS; OSTI as DE00768556

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  • Other Information: PBD: 28 Nov 2000

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  • Report No.: WSRC-TR-2000-00427
  • Grant Number: AC09-96SR18500
  • DOI: 10.2172/768556 | External Link
  • Office of Scientific & Technical Information Report Number: 768556
  • Archival Resource Key: ark:/67531/metadc725204

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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Creation Date

  • November 28, 2000

Added to The UNT Digital Library

  • Sept. 29, 2015, 5:31 a.m.

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  • May 5, 2016, 2:04 p.m.

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Rudisill, T.S. Initiation Temperature for Runaway Tri-n-Butyl Phosphate/Nitric Acid Reaction, report, November 28, 2000; South Carolina. (digital.library.unt.edu/ark:/67531/metadc725204/: accessed October 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.