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The feasibility of two types of gages for measuring the plate separation in flat fuel-plate subassemblies was investigated with experimental model gages. One gage is based on a four-arm strain-gage bridge mounted on a flexible berylliumcopper beam. The deflection of the sensing beam as the gage traverses the channel is continuously recorded by a strain-gage analyzer. The second gage is a liquid-filled system consisting of a small flat pluager-and-cylinder arrangement. .4 rubber diaphragm between the piston and the cylinder serves as the seal. .4s the element is inserted in the space hettveen the plates, the piston is forced into the cylinder. The liquid, distilled water, thus displaced expands an external bellows. The variable expansion during a scan is measured by a differential transformer and recorded. The recorded output from either gage is directly proportional to the actual channel spacing and is reproducible to within 0.001 in. The general performances of the tno gages are equivalent except that an error of about 0.001 in. is introduced into the calibration of the hydraulic gage for each 3 F change in ambient temperature. The strain-gage-type gage is temperature compensated.

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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.