[en] Elimination of accidents at the nuclear and radiation hazardous installations and elaboration of the adequate elimination procedure are among the tasks to be tackled to ensure the nuclear safety. According to the records of fire extinguishing efforts at the Chernobyl NPP, the primary measures to eliminate the effects of a severe beyond the design basis accident boil down to the extinguishing of numerous seats of fire under the effect of high radiation fields. Both water and aqueous solutions of foaming agents were used to extinguish fire. One points out that the neutron-absorbing agents, namely, the boron and the gadolinium water-soluble salts should be added to the water and the foaming agents so that the multiplication factor in the fissionable material + water composition will be less than 1 to prevent initiation of the self-supporting chain fission reaction. Taking into consideration both the adequate service characteristics and reasonable price one recommends to use saponifying thallous pitch as a dust-removing agent in the remediation area