View in EDS

Physico-chemical properties of Chernobyl lava and their destruction products.

Saved in:
Bibliographic Details
Title: Physico-chemical properties of Chernobyl lava and their destruction products.
Authors: Shiryaev, Andrey A.1,2,3 shiryaev@phyche.ac.ru, Vlasova, Irina E.2, Burakov, Boris E.4, Ogorodnikov, Boris I.5, Yapaskurt, Vasily O.6, Averin, Alexey A.1, Pakhnevich, Alexey V.7, Zubavichus, Yan V.8
Source: Progress in Nuclear Energy. Sep2016, Vol. 92, p104-118. 15p.
Subjects: Chernobyl Nuclear Accident, Chornobyl, Ukraine, 1986, Lava, Nuclear accidents, Scanning electron microscopes, Monoclinic crystal system
Abstract: The paper commemorates 30th anniversary of severe nuclear accident at the 4th Unit of Chernobyl NPP. Results of the investigation of radioactive glassy lava-like materials formed as a result of the accident at their current state are presented. Complementary analytical methods: vibrational spectroscopy, XAFS, SEM, EBSD, X-ray tomography, provide new information about structure of the Chernobyl lava matrix and inclusions. Most of these techniques are applied to the lava samples for the first time and allow to derive consistent model of the lava and to resolve some of existing controversies. The glassy matrix of the lava is an anhydrous depolimerised metaluminous glass with signs of devitrification. Principal inclusions are (U,Zr)O 2−x and (Zr,U)O 2−x solid solutions with tetragonal and monoclinic structures, UO 2 and U-rich zircon. Cracks around large inclusions are observed; some of them could be caused by volume expansion during tetragonal to monoclinic transition in zirconia. The lava accumulations are characterized by different stability against spontaneous destruction, with the pumice-like lava being the least stable, generating radioactive aerosols and particles with sizes up to 250 μm. [ABSTRACT FROM AUTHOR]
Copyright of Progress in Nuclear Energy is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
Description
Abstract:The paper commemorates 30th anniversary of severe nuclear accident at the 4th Unit of Chernobyl NPP. Results of the investigation of radioactive glassy lava-like materials formed as a result of the accident at their current state are presented. Complementary analytical methods: vibrational spectroscopy, XAFS, SEM, EBSD, X-ray tomography, provide new information about structure of the Chernobyl lava matrix and inclusions. Most of these techniques are applied to the lava samples for the first time and allow to derive consistent model of the lava and to resolve some of existing controversies. The glassy matrix of the lava is an anhydrous depolimerised metaluminous glass with signs of devitrification. Principal inclusions are (U,Zr)O 2−x and (Zr,U)O 2−x solid solutions with tetragonal and monoclinic structures, UO 2 and U-rich zircon. Cracks around large inclusions are observed; some of them could be caused by volume expansion during tetragonal to monoclinic transition in zirconia. The lava accumulations are characterized by different stability against spontaneous destruction, with the pumice-like lava being the least stable, generating radioactive aerosols and particles with sizes up to 250 μm. [ABSTRACT FROM AUTHOR]
ISSN:01491970
DOI:10.1016/j.pnucene.2016.07.001