Chemical stability of caesium iodide deposits in air/steam atmosphere

JOURNAL OF HAZARDOUS MATERIALS

卷:409

Article

Obada, D.^1,2  Hijazi, H.^1,2  Paul, J. -F.²  Gasnot, L.³  Gregoire, A. -C.¹  Mamede, A. -S.²  Cantrel, L.¹ 

[1] CEN Cadarache, Pole Surete Nucl, Inst Radioprotect & Surete Nucl, F-13115 St Paul Les Durance, France

[2] Univ Lille, Univ Artois, CNRS, UMR 8181,UCCS Unite Catalyse & Chim Solide,Cent L, F-59000 Lille, France

[3] Univ Lille, CNRS, UMR 8522, Physicochim Proc Combust & Atmosphere PC2A, F-59000 Lille, France

关键词: Fission products;    Re-vaporization;    Severe nuclear accident;    DFT calculations;   

DOI  :  10.1016/j.jhazmat.2020.124519

来源: Elsevier

【 摘 要 】

Iodine compounds that may be released in case of severe nuclear accident will have important radiotoxicity if they are disseminated in air. One of the most important iodine species is CsI that is deposited on the surfaces of the reactor coolant system. However, depending on the conditions, CsI can volatilize or react with oxidants to produce I-2(g). Theoretical and experimental studies demonstrate that the oxidation of iodide depends on the temperature and in the presence of oxidants in the gas. It is also slightly influenced by the crystallinity of the CsI particles and the nature of the support. In case of a high temperature deposition, the iodine release started at temperature lower than 300 degrees C. For the CsI vapour and aerosol depositions, the iodine is detected only at temperature above 450 degrees C and become very important above 550 degrees C.

【 授权许可】

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