Tellurium transport in the RCS under conditions relevant for severe nuclear accidents
Journal article, 2021

In the case of a severe nuclear power plant accident, tellurium is one of the more problematic and volatile fission products. If released it could become a health issue as it decays to iodine which accumulates in the thyroid gland. Research exists, that indicates tellurium likely interacts with caesium under severe accident conditions, thus it is important to further explore related phenomenon. In this work, tellurium was exposed to high temperature under oxidizing and inert conditions simulating severe accident conditions with and without airborne caesium iodide to determine the effect on the tellurium source term. The effect of caesium iodide was noticeable on tellurium transport behaviour in the gas phase under oxidizing and inert conditions. Under humid oxidizing conditions with caesium iodide, no significant impact on the total aerosol mass transport was noticed. However, less tellurium was transported through the model primary circuit and a potentially new compound was observed on the filter located after this model. Comparing inert dry to humid with caesium iodide showed an increase in the total aerosol mass transport whereas there was a decrease noticed of the tellurium reaching the filter after the model primary circuit. In the latter case, new unidentified compound(s) correlated to caesium, iodine and tellurium were observed on the filter located after the model. In this work, evidence was found that tellurium behaviour will be affected by caesium iodide under the investigated conditions. Moreover, it seems that under inert conditions the formed compounds may be stable at close to ambient temperatures. Unlike under oxidizing conditions, where dissociation likely occurred.

Interaction

Transport

Tellurium

RCS

Severe nuclear accident

Caesium iodide

Author

Fredrik Espegren

K administration

T. Karkela

Technical Research Centre of Finland (VTT)

Anna-Elina Pasi

Chalmers, Chemistry and Chemical Engineering, Energy and Material, Nuclear Chemistry

Unto Tapper

Technical Research Centre of Finland (VTT)

Jan Kučera

Nuclear Physics Institute

Hans Vigeland Lerum

University of Oslo

J. P. Omtvedt

University of Oslo

Christian Ekberg

Chalmers, Chemistry and Chemical Engineering, Energy and Material

Progress in Nuclear Energy

0149-1970 (ISSN)

Vol. 139 103815

Subject Categories

Meteorology and Atmospheric Sciences

Water Engineering

Geosciences, Multidisciplinary

DOI

10.1016/j.pnucene.2021.103815

More information

Latest update

7/15/2021