The radial thermal expansion <$E alpha sub r> of bundles of single-walled carbon nanotubes saturated with <$E nothing sup 3 roman He> up to the molar concentration 9,4 % has been investigated in the temperature interval 2,1 - 9,5 К by high-sensitivity capacitance dilatometry. In the interval 2,1 - 7 К a negative <$E alpha sub r> was observed, with a magnitude which exceeded the largest negative <$E alpha sub r> values of pure and <$E nothing sup 4 roman He>-saturated nanotubes by three and two orders of magnitude, respectively. The contributions of the two He isotope impurities to the negative thermal expansion of the nanotube bundles are most likely connected with the spatial redistribution of <$E nothing sup 4 roman He> and <$E nothing sup 3 roman He> atoms by tunneling at the surface and inside nanotube bundles. The isotope effect turned out to be huge, probably owing to the higher tunneling probability of <$E nothing sup 3 roman He> atoms.

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