[en] Concerning the safety of the ground storage of radioactive wastes, many investigations were done at A block in an atomic institute. For the purpose of the presuming the behavior of radionuclide in the ground, many investigations were done at field and laboratory. The behavior through the saturated sand zone at A block of 2500 ppm NaBr solution, instead of radioactive water, surveyed using many observation wells at field. At laboratory the distribution coefficients of radioactive cations (⁶⁰Co and ⁸⁵Sr) to the sand, which governs the movement of radioactive cations, were obtained experimentally with imitated ground water. In these results, the behavior of radioactive nuclides (⁶⁰Co and ⁹⁰Sr) in the ground at A block were presumed. (author)