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Postirradiation Results. . Graphite Specimens. Metal Specimens. . HIGH-TEMPERATURE IRRADIATION O F METALS AND GRAPHITE IN FLOWING HELIUM Neil E. Miller, Donald J. hamm man, Ward S. Diethorn, and W i l l i a m H. Goldthwaite As part of the coolant-core evaluation studies i n an early phase of the Maritime Gas-Cooled Reactor (IIIGCR) program, nickel, K-Monel, niobium-1 w / o zirconium, and graphite were irradiated i n a convective flow of helium. A capsule of novel design was used to study the corrosion of the metals at 1500 F and 960 F i n a 243-hr B R R experiment. mens, were encapsulated i n a stainless steel capsule. A convective flow of helium was maintained i n the closed tori by heating one leg of each torus to 1500 F and the other at 960 F. getter gaseous impurities. Four helium-filled quartz tori, containing the speci-Zirconium foil was placed i n two of the tori to No attack of the nickel and niobium-1 w / o zirconium was observed at either temperature. ~?!eta.llographic examination did show a 1 to 2.5-mil attack of the K-!lone1 at 1500 F in a torus containing no getter.