HIGH-TEMPERATURE INTERACTION OF NUCLEAR FUEL WITH CHANNEL REACTOR MATERIALS AND FUEL-CONTAINING SILICATE COMPOSITION WHEN HEAVY NUCLEAR ACCIDENT FORMATION

摘要

The experimental research of high-temperature physicochemical interaction of uranium fuel with both the fuel element envelopes and channel reactor design materials have been carried out. The conditions and characteristics of such an interaction are quantitatively determined as well. The fuel and zirconium envelopes chemical interaction with melted serpentine filling was the leading process in active stage of 1986 accident on Chornobyl NPP. The thermal radiation fluidity phenomena were the factor promoting wide dissemination of silicate compositions containing fuel (LFCM) inside the destroyed 4th Unit. The active phase script of course scenario revaluation necessity outcomes from the experimental results. It is shown that the heavy radioecological consequences of accident (when comparing with other heavy nuclear accidents) were mainly stipulated by a rough fault was made at the stage of channel reactor designing.