N.I. Chervyakov, P.A. Lyakhov
D.A. Derevyanko - ost-graduate Student, National Research Nuclear University MAPHI (Moscow Engineering Physics Institute). E-mail: nrndda@gmail.com
I.I. Shagurin - Dr.Sc. (Eng.), Professor, National Research Nuclear University MAPHI (Moscow Engineering Physics Institute). E-mail: ishagurin@inbox.ru