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Enhancing Nuclear Safety


Research

Theses vivas

Interactions between sodium carbonate aerosols and iodine fission-products


​Ankita Jadon will defend her thesis

on Friday 20th July 2018 at 10:30 am

at Salle de cinéma Midic

13115 St Paul Lez Durance, France



Subject description


 

 

The safety analysis of Generation IV sodium-cooled fast neutron reactors requires the study of the consequences of a severe accident in case of release into the environment of sodium and the radionuclides it carries (term chemical and radiological source). The global source term therefore depends on both the chemical speciation of sodium aerosols, resulting from the combustion of sodium in the containment, and their interactions with radionuclides. During this thesis, the interactions between sodium carbonate and iodinated gaseous fission products (I2 and HI) were studied at the atomic and macroscopic scales, via a combined theoretical and experimental approach. An analytical expression of the adsorption isotherm has been developed. The relative stability of the sodium carbonate surfaces was determined by ab initio calculations using density functional theory. The reactivity of iodine has been studied for the most stable surfaces and the adsorption isotherms evaluated. In parallel, the kinetics of capture of molecular iodine by sodium carbonate has been determined experimentally for different boundary conditions.


The results show an effective capture of the molecular iodine by sodium carbonate at 373 K, varying according to the partial pressure of iodine and the surface of the carbonate sorbent. For the representative conditions of a severe accident, the adsorption sites of the most favorable sodium carbonate surfaces will be mostly bare or doubly occupied depending on the partial pressure of molecular iodine; leading to an equilibrium pressure of less than 210-4 bar at 373 K.

 

 
 

 

Thesis Committee


 

​Thesis supervisor(s):​Prof. Denis PETITPREZ (University of Lille)
Dr. Sidi Souvi (IRSN)
​Referees:​Dr. Sophie SOBANSKA (University of Bordeaux)
Dr.  Monica CALATAYUD (Pierre et Marie Curie University)
​Examiners:
​Pr. Gérard Côte (Ecole Nationale Supérieure de Chimie Paris)
Pr. Olivier Tougait (University of Lille)
​Invited members:​C. Latge, (CEA)
Dr. N. Girault (IRSN)

 



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