Rudya K. Research of the accident processes and formation of the lava-like fuel-containing materials of the ruined reactor of the Chornobyl Unit 4

The work is dedicated to the problem of minimization of ChNPP accident consequances, i.e. investigations of formation process of lava-like fuel containing materials (LFCM) of ChNPP Unit 4. The experiments has been fulfilled on simulation in laboratory conditions of the LFCM formation process with the aim to verify the succession of accident development, finding of physical-chemical processes and mechanisms, which lead to the certain consequences, and of valuing of factors, determining state of nuclear and radiation safety and potential ecological impact of LFCM. The methods of investigations were experiments with synthetic LFCM. The construction was designed, equipment was made and experements on study of interaction of tightly molten materials of reactor active zone with the reactor "cold" biological protection materials. The real parameters and conditions of LFCM formation after accident and factors wich influence on its formation and further changing of its characteristics including its possible destruction were experimentally defined. The methodics and exprrimental equipment are designed and realized. The practice sence of obtained results consists in the possibility of its utilizing at analizing of nuclear units safety concerning of mechanisms of development of nonplanned accidents with reactor active zone melting and at disigning of reactor departments and planning of NPP accident measures.