Experiments in preparation for search for uranium ternary fission by means of nuclear track emulsion are summarized. The study will be focused on the possible involvement of the unstable nucleus ${}^{8}$Be in the suggested scenario of the collinear tri-partition in the fission.
Comment: To be published in Proceedings of IX International Symposium on Exotic Nuclei (EXON-2018) 10 - 15 September, 2018, Petrozavodsk, Russia