Radiation Chemical Effects in the Near Field of a Final Disposal Site - II: Simulation of the Radiolytic Processes in Concentrated NaCl Solutions
- Forschungszentrum Karlsruhe (Germany)
The radiation chemical reactions in gamma-irradiated 2 to 5.3 mol/l NaCl solutions were mathematically modeled by elementary reactions proceeding in parallel. The calculations showed that if all radiolytic gases could escape from the solution, only three final compounds would be formed proportional to the dose and independent from the dose rate: H{sub 2}, O{sub 2}, and chlorate. All other products and intermediates reached a steady-state concentration after {approx}1 kGy. Within certain limits, the yields of final radiolytic products were determined solely by the primary G values of H{sub 2} and H{sub 2}O{sub 2}. The results of the corresponding irradiation experiments carried out in glass ampoules up to {approx}1 MGy were in good agreement with the calculations. The simulation of the radiolysis under the condition that all gaseous products remain dissolved in the solution showed a nearly constant formation rate for hydrogen and oxygen. As opposed to this, the experiments conducted in autoclaves resulted in nearly steady-state conditions for the gases at some 100 kGy at a pressure of {approx}35 bars. For chlorate, the experiments and the calculation gave a constant concentration of a few micromoles per litre in 5.3 mol/l NaCl solution. A better correspondence between experiments and the simulation was achieved for the gases when the reaction model was extended for interaction of corrosion products from the autoclaves.
- OSTI ID:
- 20822126
- Journal Information:
- Nuclear Technology, Vol. 129, Issue 1; Other Information: Copyright (c) 2006 American Nuclear Society (ANS), United States, All rights reserved. http://epubs.ans.org/; Country of input: International Atomic Energy Agency (IAEA); ISSN 0029-5450
- Country of Publication:
- United States
- Language:
- English
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Radiation Chemical Effects in the Near Field of a Final Disposal Site - I: Radiolytic Products Formed in Concentrated NaCl Solutions
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Related Subjects
AUTOCLAVES
CORROSION PRODUCTS
DOSE RATES
DOSES
GASES
HYDROGEN
HYDROGEN PEROXIDE
IRRADIATION
OXYGEN
RADIOACTIVE EFFLUENTS
RADIOACTIVE WASTE DISPOSAL
RADIOLYSIS
SIMULATION
SODIUM CHLORIDES
SOLUTIONS
STEADY-STATE CONDITIONS