For the presumed operating conditions of a type INTOR thermonuclear reactor [i] a basic advantage of vanadium is the relatively rapid drop in the induced activity [2] (by about a million times after a 10-yr hold). This property is preserved in alloying of vanadium with titanium, chromium, aluminum, silicon, and carbon but becomes significantly poorer in alloying with molybdenum and especially niobium. Other properties of vanadium including the relatively high melting point, the increased heat of sublimation, and the comparatively low modulus of elasticity and coefficient of thermal expansion are favorable for these purposes. However, the thermal conductivity of even unalloyed vanadium is low (X = 31.6 W/(m.K) versus 78.2 for iron). Since the level of thermal stresses caused by temperature gradient is inversely proportional to thermal conductivity (atE/X) [3], to preserve it the degree of alloying of vanadium must be minimal. However, the necessity of providing the proper strength characteristics and corrosion resistance may necessitate significant alloying.