Search - Issue 32 - CRYSTALLIZATION OF LAVA-LIKE FUEL-CONTAINING MATERIALS FROM NSC-SO

CRYSTALLIZATION OF LAVA-LIKE FUEL-CONTAINING MATERIALS FROM NSC-SO
Cover not present CRYSTALLIZATION OF LAVA-LIKE FUEL-CONTAINING MATERIALS FROM NSC-SO
Category: Issue 32
Publication: 32
Summary

Lava-like fuel-containing materials (LFCM) from the Chornobyl NPP Unit 4 contain the main part of radionuclides. Therefore, LFCM defines radiation and environmental safety of a “New Safe Confinement - Shelter Object” (NSC - SO) complex. Forecast of FCM behavior demands information about structural characteristics and the content of crystalline phases. It is necessary to understand nature of physicochemical processes to formation of new crystalline phases in LFCM. The main attention in the work is focused on: 1) experimental researches phase composition of brown, black and polychromatic ceramics LFCM from the Chornobyl NPP Unit 4; 2) determination of physicochemical processes for change of a phase composition and new crystalline phase’s formation in LFCM. We determined by X-ray method the types and estimated the content of crystalline phases in brown, black, and polychromatic ceramics lava-like fuel-containing materials of NSC-SO. Part of them formed on the “initial” fuel-containing materials in the Chornobyl accident moment, and another part formed on the crystallization process glass matrix these materials. The crystallization process of lava-like fuel-containing materials passed the initial stage in the black and polychromatic ceramics. In addition, sustainable development stage of crystallization process passed in the brown ceramics. The oxidation of uranium dioxide in the lava-like fuel-containing materials is the reason why the cracks form in these materials.

Keywords: crystallization, lava-like fuel-containing materials, brown, black and polychromatic ceramics, diffractometer, X-ray phase analysis and X-ray quantitative analysis, phase composition.

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