Abstract: Physical considerations in explosion cave design of 10 kt TNT nuclear explosion of deuterium fusion are analyzed. The lowest quantity of heat carrier(sodium) is estimated. Physical factors affecting sodium vaporization and damping shock waves are analyzed. The action intensity in the nonstationary process of nuclear explosion——shock waves on the outer wall and durability of outer wall are qualitatively evaluated.

Key words: generating power by deuterium fusion energy, explosion cave, shock wave of nuclear explosion, vaporization of sodium