Infl of High-Dose Irrad on Core Struct, Fuel Mtls - Adv

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Klueh and P. J. Maziasz, Reduced Activation Materials for Fusion Reactors, ASTM STP 1047, American Society for Testing and Materials, 1990, p. 7. [49] F. A. Gamer and J. M. McCarthy, Reduced Activation Materials for Fusion Reactors, ASTM STP 1047, American Society for Testing and Materials, 1990, p. 19. [50] F. A. Garner, H. R. Brager, D. S. Gelles and J. M. McCarthy, J. Nucl. Mater. 148 (1987) 294. [51] F. A. Garner, F. Abe and T. Noda, J. Nucl. Mater. 155-157 (1988) 870. [52] J. M. McCarthy and F.

5Ni, the latter with three different isotopic mixtures for the nickel, were irradiated side by the side, the resultant changes in shear tensile properties and microstructures were mostly dependent on the mere presence of nickel, rather than being significantly dependent on the helium generation rate. In retrospect, this conclusion is not unexpected, since two earlier ion bombardment studies by Johnston et al. on Fe-Cr binaries[71] and Ayrault et al. on HT-9[72] demonstrated that addition of 2% nickel as a chemical additive changed the swelling behavior more than did additions of helium.

It is felt that under these conditions, hydrogen diffusion can be retarded enough by the high microstructural densities characteristic of these temperatures and may be stored as H2 in small bubbles initially nucleated by helium. Garner has proposed that such a mechanism may act to cause voids to form at very low temperatures (250-350°C) in high nickel alloys irradiated in light water reactors[64]. Possible evidence for helium-hydrogen interactions in cavities may have been provided by Matsuoka and coworkers[65].

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