DWPF integrated cold runs revised technical bases for precipitate hydrolysis

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The report defines new precipitate hydrolysis process operating parameters for DWPF Chemical runs assuming the precipitate feed simulants to be processed reflect the decision to implement a final wash of the tetraphenylborate slurry before transfer to DWPF (i.e. the Late Wash Facility). Control of the nitrite content of the tetraphenylborate slurry to 0.01M or less has eliminated the need for hydroxylamine nitrate (HAN) during hydrolysis. Consequently, the oxidant nitrous oxide will not be generated. However, nitric oxide (NO) is expected to be generated (reaction of formic acid with nitrite) and some fraction of the NO can be expected to be ... continued below

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8 p.

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Landon, L.F. June 1, 1992.

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Description

The report defines new precipitate hydrolysis process operating parameters for DWPF Chemical runs assuming the precipitate feed simulants to be processed reflect the decision to implement a final wash of the tetraphenylborate slurry before transfer to DWPF (i.e. the Late Wash Facility). Control of the nitrite content of the tetraphenylborate slurry to 0.01M or less has eliminated the need for hydroxylamine nitrate (HAN) during hydrolysis. Consequently, the oxidant nitrous oxide will not be generated. However, nitric oxide (NO) is expected to be generated (reaction of formic acid with nitrite) and some fraction of the NO can be expected to be oxidized to nitrogen dioxide. The rate of NO generation with low nitrite feed has not been quantified at this time nor is the extent to which the NO is oxidized to NO{sub 2} known. A mass spectrometer is being installed in the Precipitate Hydrolysis Experimental Facility (PHEF) which will enable the NO generation rate to be defined as well as the extent to which the NO is oxidized to NO{sub 2}. There is some undocumented data available for C{sub 6}H{sub 6}/NO and C{sub 6}H{sub 6}/NO{sub 2} with N{sub 2} as the diluent but no similar data for CO{sub 2}. Development of test data in the required time frame is not possible. However, MOC`s will be estimated for benzene/NO/NO{sub 2}/CO{sub 2} gas mixtures (the MOC is expected to be approximately 60% less than for the HAN process). Once these data are obtained, and NO/NO{sub 2} concentration profiles are obtained from PHEF hydrolysis process demonstrations, a flammability control strategy for the DWPF Salt Processing Cell will be developed. Implementation of the HAN process purge strategy upon startup of the SPC with the late wash process would be conservative.

Physical Description

8 p.

Notes

INIS; OSTI as DE97000273

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  • Other Information: PBD: 1 Jun 1992

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  • Other: DE97000273
  • Report No.: WSRC-RP--92-737
  • Grant Number: AC09-89SR18035
  • DOI: 10.2172/383585 | External Link
  • Office of Scientific & Technical Information Report Number: 383585
  • Archival Resource Key: ark:/67531/metadc685386

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  • June 1, 1992

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • Feb. 9, 2016, 4:58 p.m.

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Landon, L.F. DWPF integrated cold runs revised technical bases for precipitate hydrolysis, report, June 1, 1992; Aiken, South Carolina. (https://digital.library.unt.edu/ark:/67531/metadc685386/: accessed May 19, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.