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Khersonsky Y.,Odessa National Polytechnic Institute
IEEE Electrification Magazine | Year: 2015

Thanks to the continuously increasing computing speed, 21st-century new technologies are coming more rapidly than ever before. This has created a paradox that research and development time for new technologies is shrinking; however, the transition time of new technologies into real products is growing. One of the reasons for this growth in the product development time is that, in complex systems, not all assumptions can be defined precisely and many corrections are made during the integration of new technologies into the real world. Another reason is the 'not invented here? syndrome and very little respect toward engineering standards among many academic and advanced development professionals, who view standards as barriers or a humorous subject as it was presented in a presentation at the 2015 IEEE Electrical Ship Technologies Symposium (ESTS), shown in Figure 1. © 2015 IEEE.

Skalozubov V.I.,Ukrainian Academy of Sciences | Bogodist V.V.,National Nuclear Energy Generating Company Energoatom | Kozlov I.L.,Odessa National Polytechnic Institute | Gablaia T.V.,Ukrainian Academy of Sciences | Yu Kochneva V.,Ukrainian Academy of Sciences
Nuclear and Radiation Safety | Year: 2014

Flooding of the NPP site because of a beyond design basis earthquake followed by a tsunami was one of the principal causes of the Fukushima Daiichi accident. The National Stress-Test Report of Ukraine indicates that such events are unlikely to occur at sites of Ukrainian NPPs. However, the methodology used in stress tests has been insufficiently proved as long as it considers quasistationary processes of propagation of a possible flooding wave. The paper offers a hydrodynamic model of possible flooding of the Zaporizhzhya NPP site during beyond design basis earthquakes and tornadoes. Unlike the quasistationary approach of stress tests, the model takes into account the dynamic nature of flooding processes and direct effects of external hazards on the Kakhovka Reservoir. The results of the hydrodynamic modeling are possible conditions and criteria of flooding for the Zaporizhzhya NPP site under external hazards.

Todortsev Y.K.,Odessa National Polytechnic Institute | Tsiselskaia T.A.,Odessa National Polytechnic Institute | Nikolskiy M.V.,Odessa National Polytechnic Institute
Nuclear and Radiation Safety | Year: 2014

The paper is devoted to development of an improved automated power control system (APCS) for a VVER-1000 power unit operated in daily cycle load follow modes to maintain a daily power balance in the Ukrainian power system. The requirements for power unit load follow operation are high reliability and safety which depend on stability of the reactor in transition from a power level to another one. The axial offset is a quantitative measure of the reactor stability. It has been shown that a change in the core inlet coolant temperature yields an uncontrollable disturbance affecting the axial offset and therefore the reactor stability. An improved APCS has been developed. The main feature of the improved APCS is using three new control loops: the coolant inlet temperature is kept constant in the primary loop, while the axial offset is kept constant in the secondary one, the nuclear unit power is changed by varying boric acid concentration. Use of these three new control loops provides stability of the reactor in daily nuclear unit power follow modes.

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