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Cluj-Napoca, Romania

Mihalache M.,RAAN SCN Pitesti | Meleg T.,RAAN SCN Pitesti | Pavelescu M.,Academia Oamenilor de Stiinta
Revista Romana de Materiale/ Romanian Journal of Materials | Year: 2010

Analysis of postulated loss-of-cooling accidents (LOCA) in CANDU 6 reactors has to consider oxidised state and Zr-2.5%wtNb alloy microstructure. During thermal transients, in oxidized alloy, microstructure changes in oxide layer and material base have been observed by optical microscopy, scanning electron microscopy (SEM) and energy dispersive X-ray spectrometry (EDS). Samples isothermally oxidized at 700°C, with variable thickness oxide layers, were subjected to the various temperature transients up to 1000°C, at different controlled heating/cooling rates. The effects of oxide and alloy microstructural changes are correlated with the characteristics of thermal transients. Source

Teoreau I.,Polytechnic University of Bucharest | Deneanu N.,RAAN SCN Pitesti | Dulama M.,RAAN SCN Pitesti
Revista Romana de Materiale/ Romanian Journal of Materials | Year: 2010

There are a variety of matrix materials and commercially techniques available for conditioning organic radioactive wastes. This paper provides an overview of the application context and evolution of several important matrix materials and offers comments on the waste form requirements under disposal conditions. In this paper emphasis has been placed on the conditioning options available commercially and that have, to various degrees, been demonstrated to be viable. At the same time, it is recognized that other matrices are being researched as possible for future options. Included in these options are magnesium phosphates binding systems and mixed cement with Portland composite cement and Calcium Aluminate Cement. Source

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