Reactor graphite and its life-time

Dose dependences of dimensions change and of modulus of elasticity within wide ranges of temperatures and fluxes of neutrons for home reactor graphite materials are presented. Their life-time has been estimated. A possibility of exploitation of masonry blocks made of reactor graphite in RBMK-type reactors during 40-45 years has been shown. Temperature dependences of secondary swelling rate are presented. Maximum of secondary swelling rate of graphites investigated has been determined. The maximum falls within the temperature range of 1000-12000 K. An assumption has been made that the maximum was growing exponentially while graphite density increased.