Fission Chambers Detector Unit Mockup Testing at Research Reactors V. P. Alferov, V. A. Fedorov, A. V. Kudryavtsev, E. S. Martazov, N. A. Selyaev, A. V. Batyunin, Yu. A. Kashchuk and V. A. Vorobiev EPJ Web Conf., 170 (2018) 04007 Published online: 10 January 2018 DOI: 10.1051/epjconf/201817004007