Tellurium Behavior in the Containment Sump: Dissolution, Redox, and Radiolysis Effects
Journal article, 2020

In the event of a severe nuclear accident, one major concern is the release of radioactive material into the environment causing potential exposure of the general public to radiation. Among the volatile radionuclides are a range of tellurium isotopes. Due to the radioactivity and the volatility of tellurium, it has to be taken into account when assessing the overall effects of an accident. The interest in tellurium is not limited only to its release but also to the fact that some tellurium isotopes decay to iodine, and thus affect the iodine release behavior. The release and transport behavior of tellurium has been investigated over the past decades, however, the aqueous chemistry of tellurium in the complex containment sump system is still unclear. This study presents the behavior of tellurium dioxide in simplified containment sump conditions in relation to dissolution, redox reactions, and interactions with water radiolysis products. The results indicate that radiolysis products have a significant effect on tellurium chemistry in both a reducing and oxidizing manner depending on the solution composition. The redox reactions also affect the solubility of tellurium. The results show that the current information used to assess tellurium source term needs to be reevaluated for both severe accident management and for code validation purposes.

fission product

Tellurium

containment

severe accident

sump

Author

Anna-Elina Pasi

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

Henrik Glänneskog

Vattenfall

Mark Foreman

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

Christian Ekberg

Chalmers, Chemistry and Chemical Engineering, Energy and Material

Nuclear Technology

0029-5450 (ISSN)

1-11

APRI 10 - Studies of Tellurium, Molybdenum, Iodine and other important volatile fission products during severe nuclear ractor accidents

Agrenius Ingenjörsbyrå, 2018-01-01 -- 2020-12-31.

Subject Categories

Subatomic Physics

Atom and Molecular Physics and Optics

Other Physics Topics

Areas of Advance

Energy

Roots

Basic sciences

DOI

10.1080/00295450.2020.1762456

More information

Latest update

9/4/2020 2