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The subject report describes the results of the evaluation of experimental NERVA reactor insulating sleeves made from a highly flexible, anisotrc^ic, pyrolytic graphite foil, known as Grafoil-100, These Grafoil sleeves appear to have a great potential as replacements for the conventional vapor deposited and machined pyrolytic graphite sleeves. Besides the inherent advantages of uniformity and the absence of deposition defects, they appear to have satisfactory axial load deformation and resilience choracterlstics, and resistance to abrasion, thermal gradients, theimal shock, and hydrogen corrosion at 2000 F (1100 C). The areas of concern that remain are the higher and somewhat unstable thermal conductivity and the excessive hydrogen corrosion at 3000 F (1650 C). Very truly yours, •J''r'V"-i' '/'jr"*-C-0 ff-.^ f. C ^,.^ i.« H. F. Fought Program Manager NERVA Nuclear Subsystem bb Enclosures (3) •KEN SEPAMTED FROM MCLCSUBES. HANDLE THIS BOCUMSST 4S iLu.

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Microstructure of Transverse Section of SAMCO Cup 22 No. 5 (25X)