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Graphite masonry is never replaced during the operational lifetime of uranium-graphite reactors. For this reason, the state of the graphite is extremely important for safe operation. Radiation-induced changes in the properties of the graphite can be predicted only approximately on the basis of investigations [1], since such a prediction neglects many factors that affect the preservation of the masonry. In this connection, for purposes of measuring a set of characteristics of graphite that determine the possibility of further operation of the reactor, core samples are systematically drilled out of the blocks in theIn the present paper we summarize investigations of the changes occurring in the properties of masonry graphite during the operation of the AM-1 reactor in the first nuclear power plant in Obninsk.