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NOCHAR polymers an aqueous and organic liquid
solidification process for Cadarache LOR
(Liquides Organiques Radioactifs)
CE.VAUDEY AREVA BUA Technical Direction 25/02/201
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NOCHAR polymers a solidification process for
Cadarache LOR

• Summary
• Introduction
• Waste handling
• Cadarache LOR waste streams characteristics
• Method and experimental device
• Results and discussion
• Conclusion and outlook

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NOCHAR polymers a solidification process for
Cadarache LOR

• Introduction
• Waste handling
• For VLLW and LLW handling in France 2 options
• Incineration at CENTRACO facility
• Disposal facility on ANDRA sites
• Waste acceptance in a radwaste route
• Adequacy Waste characteristics/Radwaste route
  specifications
• In case of incompatible necessary to find an
  alternative solution
• A waste pre-treatment process

• Cadarache LOR waste streams characteristics
• 2 radioactive scintillation cocktails

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NOCHAR polymers a solidification process for
Cadarache LOR
LOR 20 LOR 75
Volume (L) and Mass (kg) Volume (L) and Mass (kg) 208L and 206kg 137L and 137kg
Composition Composition 11 Xylene 1.6 Mesitylene 0.4 Diphenyloxazole 0.1 TBP 91.4 Water 8.6 TBP 91.4 Water
Physical chemistry characteristics Physical chemistry characteristics 1.7 mg.g-1 Chloride 0.61 mg.g-1 Fluoride 0.9 mg.g-1 Sulfate 1.3 mg.g-1 Chloride 0.23 mg.g-1 Fluoride 2.1 mg.g-1 Sulfate
Radiological characterisctics Spectra Am-241 Co-60 Cs-137 H-3 Am-241 Pu-241 Cs-137
Radiological characterisctics Mass activity AAlpha 3.78x108 Bq.g-1 ABeta/Gamma 5.55x105 Bq.g-1 ATritium 3.47x106 Bq.g-1 AAlpha 8.67x108 Bq.g-1 ABeta/Gamma 8.62x103 Bq.g-1

• LLW (mass activity equal to some kBq.g-1)
  Organic and aqueous components Presence of
  significant quantities of tritium, chlorine and
  fluorine
• Needs of a pre-treatment NOCHAR polymers
  as solidification process

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NOCHAR polymers a solidification process for
Cadarache LOR

• Method and experimental device
• NOCHAR polymers
• N910 for organic liquids solidification
• N960 for aqueous liquids solidification
• Implementing of polymers technology 2 main
  steps
• mixing waste/polymer
• curing during 24h to 48h
• Process specificities
• For N910 Creation of permanent chemical bonds
  between organic liquids and polymer
• For N960 Creation of strong mechanical bonds
  between aqueous liquids and polymer
• Final product immobilised solid stable under
  radiation, non-toxic, not dangerous,
  non-corrosive and non-biodegradable
• Evaluation of formulation validity approach in
  3 steps
• Identification of the ideal polymer formulation
  with a Waste/Polymer mass ratio 11
• Increase of Waste/Polymer mass ratio
• Observations, evaluations of residual liquid
  presence/absence and manual exudation tests

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NOCHAR polymers a solidification process for
Cadarache LOR

• Results and discussion
• Ideal polymer formulation?
• 3 types of results
• Sticky, doughy, glistening with presence of
  residual moisture or waste
• Dry sample
• Dry sample with presence of polymer N910 excess
  
• Ideal polymer formulation Dry sample

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NOCHAR polymers a solidification process for
Cadarache LOR

• Ideal Waste/Polymer mass ratio?
• For ideal polymer formulation, 3 ratios
• 1 1 -gt Dry sample
• 2 1 -gt Sticky, doughy, glistening with presence
  of residual moisture

LOR 20
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NOCHAR polymers a solidification process for
Cadarache LOR

• Observations, evaluations of residual liquid
  presence/absence and manual exudation tests ?
• For ideal polymer formulation and Waste/Polymer
  mass ratio 1 1
• After a curing of 1 and 20h, no moisture and no
  waste desorption under exudation test

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NOCHAR polymers a solidification process for
Cadarache LOR

• Discussion
• For LOR 20
• Ideal formulation N910/N960 mass ratio equal to
  0.50 0.50
• N910 absorption power higher than the N960 one
• Ideal Waste/Polymer mass ratio equal to 1 1
• Xylene and mesitylene composed of a benzenic
  ring and methyl groups
• -gt Limited number of free carbon atoms
• -gt Negative effects on the reactive mechanism
  which occurs during the Waste/Polymer mixing to
  form covalent bonds between the two products
• For LOR 75
• Ideal formulation N910/N960 mass ratio equal to
  0.25 0.75
• N910 absorption power higher than the N960 one
• Ideal Waste/Polymer mass ratio equal to 11
• Nature of the organic product (TBP)
• -gt Negative effects on the reactive mechanism
  which occurs during the Waste/Polymer mixing to
  form covalent bonds between the two products

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NOCHAR polymers a solidification process for
Cadarache LOR

• Conclusion and Outlook
• For Cadarache LOR waste, pre-treatment by polymer
  adapted
• Polymers suitable
  solidification matrix for a final acceptance in
  storage on ANDRA sites
• To consolidate this conclusion, 3 future steps
• Optimisation of the adapted formulations by
  tests
• Realisation of a waste field study based on
• the experimental data collected during this
  study,
• the potential adequate between pre-treated
  Cadarache LOR waste streams characteristics and
  ANDRA specifications,
• the ANDRA agreement principle on VLLW, LLW and
  ILW immobilised by polymers
• Final product conditioned in homogenous waste
  package (waste immobilised by polymers placed in
  cement matrix)
• Final product conditioned in heterogeneous waste
  at 10 for the waste immobilised by polymers and
  at 20 for the waste immobilised by polymers
  placed in cement matrix
• Preparation of an ANDRA agreement file for
  Cadarache LOR waste streams pre-treated by NOCHAR
  polymers