The concept of a power plant for a fast ignition heavy ion fusion is briefly reviewed. The reactor chamber response to x-ray irradiation, ion debris and neutron flux is considered. Ablation of a thin liquid film at the first wall is simulated by means of a one-dimensional hydrodynamic code. Ion debris reheating of the vaporized coolant is evaluated. Vaporization and subsequent condensation of the coolant is computed with the use of a kinetic model of fast condensation. Heating of the blanket due to neutron deposition and corresponding generation of pressure and stress waves are simulated by means of the Monte Carlo (MCNP) code and by the strength media mechanics code, respectively.