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Bulka S.K.,A Branch of the Rosenergoatom Concern | Rosnovskii S.V.,A Branch of the Rosenergoatom Concern
Thermal Engineering (English translation of Teploenergetika) | Year: 2014

A unified automated system for accounting and control of radioactive substances and radioactive wastes was developed at the Novovoronezh nuclear power plant. The system consists of several interconnected subsystems, which can be developed and put in operation in a stage-wise manner. As of the first quarter of 2013, the subsystems for accounting liquid and solid radioactive wastes, very low-active wastes, and tracers have been developed. The experience gained from the development and putting in use of these systems showed that this is an efficient, timely, and much needed software product. © 2014 Pleiades Publishing, Inc. Source


Kharchenko K.S.,A Branch of the Rosenergoatom Concern | Vitkovskii I.L.,A Branch of the Rosenergoatom Concern
Thermal Engineering (English translation of Teploenergetika) | Year: 2014

Performance of the secondary coolant circuit rupture algorithm in different operating modes of the Novovoronezh NPP Unit 5 is considered by carrying out studies on a full-scale training simulator. The revealed shortcomings of the algorithm causing excessive actuations of the protection are pointed out, and recommendations for removing them are outlined. © 2014 Pleiades Publishing, Inc. Source


Kritskii V.G.,Leading Institute VNIPIET Vtoraya | Rodionov Yu.A.,Leading Institute VNIPIET Vtoraya | Berezina I.G.,Leading Institute VNIPIET Vtoraya | Zelenina E.V.,Leading Institute VNIPIET Vtoraya | And 5 more authors.
Thermal Engineering (English translation of Teploenergetika) | Year: 2014

For a few fuel campaigns in the first years of their extended service life, the Novovoronezh NPP Units 3 and 4 had to operate with a limited reactor thermal power output due to constraints imposed on certain parameters of the reactor core. The decrease of thermal power output during a campaign was accompanied by a growth of pressure difference across the reactor caused by accumulation of deposits in the fuel assemblies, which in turn led to a growth in the number of leaky fuel rods. Compensating measures were implemented based on the results obtained from the performed investigations and modeling of corrosion product mass transfer processes, which in the final analysis made it possible to minimize the accumulation of deposits in fuel assemblies and loss of fuel rod tightness, and to exclude the need to limit the reactor thermal power as demanded by constraints imposed on the reactor core parameters. © 2014 Pleiades Publishing, Inc. Source


Fedorov A.I.,A Branch of the Rosenergoatom Concern | Vitkovskii S.L.,A Branch of the Rosenergoatom Concern | Vitkovskii I.L.,A Branch of the Rosenergoatom Concern | Fomenko V.I.,A Branch of the Rosenergoatom Concern | And 4 more authors.
Thermal Engineering (English translation of Teploenergetika) | Year: 2014

Information on the experience gained from safe operation of the Novovoronezh nuclear power plant from the moment its first power unit was commissioned and till now is presented. The following modifications and design solutions on improving the equipment and systems of the Novovoronezh nuclear power plant units that were introduced during plant operation are of special importance: (i) further development of the designs of fuel rods and fuel assemblies (ii) improvement of the control members used in the reactor control and protection system (the specific features of the control and protection system members used in Units 1-5, and modifications made in the composition of control member groups in Units 3 and 5 for optimizing the power density distribution (iii) further development of fuel charge patterns (iv) investigations carried out in the "hot chamber" at the Novovoronezh NPP (rendering support to the introduction of new kinds of fuel) (v) further development of nuclear fuel management systems and introduction of systems for handling leaky fuel assemblies of the VVER-440 reactor (vi) improvement of systems for cooling the reactor cores of Units 3 and 4; and (vii) further development of metal diagnostic and examination methods in revealing various types of flaws, and experience gained from the use of new equipment. Information about the modernization and service life extension of the Novovoroneh Units 3-5 beyond the 30-year design service life is presented together with substantiating the residual life of power unit elements important to safety. © 2014 Pleiades Publishing, Inc. Source


Gorburov V.I.,Moscow Power Engineering Institute | Shvarov V.A.,A Branch of the Rosenergoatom Concern | Vitkovskii S.L.,A Branch of the Rosenergoatom Concern
Thermal Engineering (English translation of Teploenergetika) | Year: 2014

A growth of deposits on fuel assembly elements was revealed during operation of the Novovoronezh NPP Unit 3 starting from 1997. This growth caused progressive reduction of coolant flow rate through the reactor core and increase of pressure difference across the assemblies, which eventually led to the need to reduce the power unit output and then to shut down the power unit. In view of these circumstances, it was decided to develop an installation for ultrasonic cleaning of fuel assemblies. The following conclusions were drawn with regard of this installation after completion of all stages of its development, commissioning, and improvement: no detrimental effect of ultrasound on the integrity of fuel assemblies was revealed, whereas the cleaning effect on the fuel assemblies subjected to ultrasonic treatment and improvement of their thermal-hydraulic characteristics are obvious. With these measures implemented, it became possible to clean all fuel assemblies in the core in 2011, to achieve better thermal-hydraulic characteristics, and to avoid reduction of power output and off-scheduled outages of Unit 3. © 2014 Pleiades Publishing, Inc. Source

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