modeling Chernobyl NPP site blasting operations deep faults degassing degassing of the Earth diapirs of intermetallic silicides dilatency zone earthquake ferrosilicide filtration fluids fractured crystalline rocks geo-reactor geological environment geological secondary and primary hydrogen groundwater groundwater productivity heat flow hydrogen deposits hydrogen explosion metals-sphere migration native metals new safe confinement permeability plasmoid resources system of "depression with its sub-bottom channel" system of “depression with its sub-bottom channel”