This is NKS NKS-R NKS-B News Seminars NKS Reports Phantom Library

You are here: Homepage NKS-R Current activities TRIO

Current activities Call for proposals Travel assistance  



Project summary


The proposed work will investigate possible interactions between boric acid and tellurium under conditions representing the primary circuit break in a pressurized water reactor. Boric acid used as a chemical shim to reduce the number of free neutrons available in the reactor. Furthermore, if the reactor is using boron carbide as the control rod material, then boric acid may also be formed in accident scenarios through its reaction with water at high temperatures.


Tellurium is a fission product and present as several radioactive isotopes. They decay through iodine, which is a highly volatile element and thus presents a radiohazard. Chemically, Tellurium is a volatile element with a rich chemistry, and several NKS- projects have been undertaken the last few years to deepen the understanding of its behavior during severe accidents. Its interaction with boric acid, however, is still unknown. Furthermore, as Tellurium decays into iodine and the interaction between tellurium and iodine in these conditions likewise is unknown. Another set of experiments will be conducted to investigate this aspect of severe accident chemistry, also involving Cesium, which is another volatile fission product.


Previous NKS-R projects have been conducted regarding Tellurium. Examples of such projects are TETRA and ORTEF, both of which involved a partnership between VTT Technical Research Center of Finland Ltd and Chalmers University of Technology. Together these institutions possess a proven technical and theoretical expertise to investigate the behaviour of Tellurium in this context.


Lead organisation

Chalmers University of Technology


Contact person

Professor Christian Ekberg 



Contact NKS   NKS Sekretariatet
Boks 49
DK-4000 Roskilde
  Telephone +45 46 77 40 41

Address for visitors
Directions and map

Privacy policy

Cookie policy


Website last modified: 13 June 2024