Nuclear Engineering Laboratory (14)

Laboratory Chief
Povilas Poškas
Prof. Habil. Dr.

Povilas.Poskas@lei.lt

Tel: +370 37 401891

Breslaujos st. 3, LT-44403 Kaunas, Lithuania


Info brochure (English)
Info brochure (Russian)

Nuclear Engineering Laboratory

MAIN RESEARCH AREAS:

  • Safety of spent nuclear fuel (snf) management;
  • Safety of radioactive waste management;
  • Assessment of different factors related to decommissioning of nuclear facilities;
  • Waste heat recovery from flue gases during biofuel combustion and reduction of the amount of emissions from the exhaust;
  • Investigation of heat transfer and hydrodynamic processess in various systems and their components;
  • Fire safety investigation.

FOR BUSINESSES WE OFFER:

  • Analysis of waste heat recovery from biofuel and other heat generating installations in heat exchangers and condensing economizers as well as evaluation of perspectives on improvement of these installations;
  • Investigation of emissions exhausted with flue gases during biofuel combustion with electrostatic and other filters as well as evaluation of perspectives on improvement of these filters;
  • Complex investigations of heat transfer and flow hydrodynamics in various technological systems and their components;
  • Modelling of cooling and/or heating of complex multicomponent objects taking into account the influence of conduction, convection, radiation, solar insolation and other external factors;
  • Fire assessment of premises with combustible materials and fire resistance assessment of structures;
  • Detailed assessment of the thermal state of a complex construction installations present or potentially present in a fire area;
  • Identification of local overheating using the system of a microscope and a thermal imaging camera;
  • Modelling of radioactive waste and spent nuclear fuel characteristics, safety and environmental impact assessment of their treatment, storage and disposal facilities;
  • Modelling of hazardous substances and gas migration in geological structures (porous, fractured media);
  • Assessment of safety, environmental impact and other factors during nuclear facility decommissioning.

MORE ON OUR ACTIVITIES

Spent nuclear fuel management

Spent nuclear fuel (SNF) is a radioactive waste generated in a nuclear reactor, the management and storage of which are addressed on a global scale. After the closure of the Ignalina Nuclear Power Plant, care must be taken to ensure that the SNF generated in its reactors is disposed of in accordance with all safety and legal requirements and does not endanger human health or the environment. The Nuclear Engineering Laboratory performs modelling of fuel characteristics, of gas and radionuclide migration in geological structures taking into account thermo-hydro-mechanical-chemical processes. Also safety and environmental impact assessments for storage and disposal facilities in accordance with the latest regulatory and legal requirements. SNF management and storage issues are addressed at the international level through participation in IAEA initiatives, as well as by drawing on good practices from foreign partners. SCALE, MCNPX, MicroSkyshine, MicroShield, Visiplan, GOLDSIM, PETRASIM, AMBER, COMSOL computer codes are used for modelling of indicated processes.

visual representation of a model using SCALE suite
Modelling using SCALE comprehensive modelling and simulation suite

Radioactive waste management

Most of radioactive waste (RW) in Lithuania was generated at the Ignalina Nuclear Power Plant, and a small percentage is also generated in science, healthcare institutions and industrial enterprises. An RW manufacturer must handle them in line with the requirements of the Regulatory Bodies and in such a way as to ensure the safety of the workers, residents and the environment. For this purpose, the Laboratory performs assessments of the release of radionuclides from waste repositories, safety assessments of waste treatment technological equipment, storage and disposal facilities, and environmental impact studies. Radionuclide migration from repositories and other characteristics are modelled using GOLDSIM, PETRASIM, AMBER, GARDENIA, Visiplan, MicroSkyshine and other pieces of software.

Modelling neutron, photon and electron (radiation) migration with MCNP-MCNPX
Modelling neutron, photon and electron (radiation) migration using MCNP-MCNPX suite

Decommissioning of nuclear facilities

Decommissioning of a nuclear facility (when the design lifetime expires, due to safety recommendations, etc.) is a process of implementing legal, organizational and technical measures that requires appropriate operating permits, licenses and, most importantly, safety assurance. In this area, the Laboratory researchers are experts in decommissioning and dismantling planning, costs and doses assessment for nuclear power plants and other nuclear facilities, as well as analyze and prepare radiological descriptions of sites, structures, systems and equipment, and carry out safety and environmental impact assessments of individual facilities. The work is performed using Visiplan, DECRAD, MicroSkyshine, MicroShield software.

Modelling radiation dose with MicroSkySchine and MicroShield
Modelling radiation dose with MicroSkySchine and MicroShield suites

Investigation of thermal processes

Investigation of thermal processes is carried out in various components of nuclear and non-nuclear facilities. Researchers of the Laboratory perform experimental investigations of heat and mass transfer processes and numerical modelling with ANCYS CFD, Comsol codes in channels of various types and designs. These investigations can be used to assess the reliability of different energy systems or heat exchangers. The researchers carry out investigations on forced and mixed convection, in turbulent and transient flow modes for single- and two-phase flows under the influence of variable physical properties, surface roughness, centrifugal forces, and other factors.

Modelling using 'Ansys Fluent' and 'Ansys CFD' software suite
Modelling using ‘Ansys Fluent’ and ‘Ansys CFD’ software suite

Biofuel combustion

Combustion of biofuels dissipates a lot of unused heat into the environment and emits pollutants due to technically outdated or inefficient equipment. The Laboratory performs scientific investigation aimed at improving the efficiency of energy generation in biofuel boiler houses by optimizing the technologies of flue gas purification (using electrostatic precipitators) and heat recovery from them. Research on heat and mass transfer processes in biofuel-fired facilities is being carried out in cooperation with Kaunas University of Technology and international partners.

Experimental stand
Experimental stand

Fire safety assessment in nuclear power plants and other significant facilities

Fire safety analysis is an important part of the safety assessment performed for a nuclear power plant as a whole or for its separate structures during operation or decommissioning. The assessment includes fire safety analysis for premises that accommodate combustible materials and construction fire resistance. A detailed assessment of the thermal condition of a complex structures located in a fire may be carried out for the fire and post-fire conditions.

Fire  modelling with PyroSim
Fire modelling using PyroSim suite

WHO ARE OUR EMPLOYEES?

Our employees are graduates from Kaunas University of Technology, Vytautas Magnus University, Vilnius University, and Vilnius Gediminas Technical University who studied thermal engineering, physics, applied physics, industrial thermal energy, biophysics, computer science, chemistry, mathematics, the English language and technical translation.

We are always looking for bright and curious graduates to join our team.


CLIENTS AND PARTNERS

Ignalina Nuclear Power Plant is the main and the largest customer of Nuclear Engineering Laboratory. We also successfully provide services to foreign customers and work with foreign and Lithuanian partners. We also implement competitive projects of the Research Council and other institutions of Lithuania.

logos of the Nuclear Engineering Laboratory partners

Publications

2021

Šmaižys A. [LEI], Narkūnas E. [LEI], Poškas G. [LEI], Naumov V., Ekaterinichev D.. Evaluation of the shielding properties of a new increased capacity storage cask for RBMK-1500 used fuel In: Progress in Nuclear Energy. Oxford: Elsevier, 2021, Vol. 141, 103986, p. 1-11. ISSN 0149-1970, eISSN 1878-4224.
Poškas R. [LEI], Sirvydas A. [LEI], Kulkovas V. [LEI], Poškas P. [LEI]. Preliminary investigations of water injection impact on vapour from flue gases condensation in a model of a vertical condensing heat exchanger In: The 17th International Conference of Young Scientists on Energy and Natural Sciences Issues (CYSENI 2021) Kaunas, Lithuania, May 24-28, 2021. Kaunas: Lietuvos energetikos institutas, 2021, p. 548-556. ISSN 1822-7554.
Poškas R. [LEI], Račkaitis K. [LEI], Poškas P. [LEI], Zujus R. [LEI]. Modeling and analysis of the flow structure in narrow helium and air gaps of the castor cask for RBMK-1500 spent nuclear fuel storage In: Proceedings 15th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics (ATE-HEFAT2021), Virtual conference, 26-28 July 2021.. Amsterdam: American Society of Thermal and Fluids Engineers, 2021, p. 1421-1426. ISBN 978-1-77592-216-2 .
Almenas K., Gasiūnas S. [LEI], Šeporaitis M. [LEI]. An improved indicator for the initiation of turbulence In: Proceedings 15th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics (ATE-HEFAT2021), Virtual conference, 26-28 July 2021. Amsterdam: American Society of Thermal and Fluids Engineers, 2021, p. 251-254. ISBN 978-1-77592-216-2 .
Puida E., Miliauskas G., Poškas R. [LEI], Poškas P. [LEI], Paukštaitis L.. An experimental investigation of the ęffęct of airlow heating and humidification on a water droplet’s thermal state and phase changes In: Proceedings 15th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics (ATE-HEFAT2021), Virtual conference, 26-28 July 2021.. Amsterdam: American Society of Thermal and Fluids Engineers, 2021, p. 224-229. ISBN 978-1-77592-216-2.
Poškas R. [LEI], Sirvydas A. [LEI], Kulkovas V., Jouhara H., Poškas P. [LEI], Miliauskas G., Puida E.. An Experimental Investigation of Water Vapor Condensation from Biofuel Flue Gas in a Model of Condenser, (2) Local Heat Transfer in a Calorimetric Tube with Water Injection In: Processes. Basel: MDPI, 2021, Vol. 9, Iss. 8, 1310, p. 1-18. Scopus. ISSN 2227-9717.
Miliauskas G., Puida E., Poškas R. [LEI], Poškas P. [LEI]. Modelling of the influence of droplet dispersity on droplet vaporization in the high-temperature flue gas in the case of combined heating In: Prime archives in sustainability . Hyderabad (Indija): Vide Leaf, 2021, p. 1-51. ISBN 978-81-944664-1-3.
Narkūnienė A. [LEI], Poškas P. [LEI], Justinavičius D. [LEI]. The Modeling of Laboratory Experiments with COMSOL Multiphysics Using Simplified Hydromechanical Model In: Minerals . Basel: MDPI, 2021, Vol. 13 (7), 754, p. 1-18. ISSN 2075-163X.
Narkūnas E. [LEI], Šmaižys A. [LEI], Poškas P. [LEI], Naumov V., Ekaterinichev D.. Neutron dose rate analysis of the new CONSTOR® storage cask for the RBMK-1500 spent nuclear fuel In: Nuclear Engineering and Technology. Daejeon: Elsevier, 2021, Vol. 53, p. 1869-1877. ISSN 1738-5733.
Miliauskas G., Puida E., Poškas R. [LEI], Poškas P. [LEI]. The Influence of Droplet Dispersity on Droplet Vaporization in the High-Temperature Wet Gas Flow in the Case of Combined Heating In: Sustainability . Basel: MDPI, 2021, Vol. 13, Iss. 7, 3833, p. 1-24. ISSN 2071-1050.
Ragaišis V. [LEI], Poškas P. [LEI], Kilda R. [LEI], Bartkus G. [LEI]. A review of uncertainties in the assessment of the radiological impact of liquid releases to the Ignalina NPP cooling pond lake Drūkšiai In: Annals of Nuclear Energy. Oxford: Elsevier, 2021, Vol. 157, 108228, p. 1-10. ISSN 0306-4549.
Dagilis V., Uldinskas Ž., Vaitkus L., Jouhara H., Poškas R. [LEI]. The simulation and analysis of wood fuel low-grade heat In: Energy . Oxford: Elsevier, 2021, Vol. 218, 119501, p. 1-10. ISSN 0360-5442.
Dagilis V., Uldinskas Ž., Vaitkus L., Jouhara H., Poškas R. [LEI]. The simulation and analysis of wood fuel low-grade heat In: Energy. Oxford: Elsevier, 2021, Vol. 218, 119501, p. 1-11. Scopus . ISSN 0360-5442, eISSN 1873-6785.

2020

Grigaliūnienė D. [LEI], Poškas R. [LEI], Kilda R. [LEI], Jouhara H., Poškas P. [LEI]. Modeling radionuclide migration from activated metallic waste disposal in a generic geological repository in Lithuania In: Nuclear Engineering and Design. Lausanne: Elsevier, 2020, Vol. 370, 110885, p. 1-10. ISSN 0029-5493.
Jonynas R., Puida E., Poškas R. [LEI], Paukštaitis L., Jouhara H., Gudzinskas J., Miliauskas G., Lukoševičius V.. Renewables for district heating: The case of Lithuania In: Energy. Oxford: Elsevier, 2020, Vol. 211, 119064, p. 1-11. ISSN 0360-5442 , eISSN 1873-6785.
Doudou S., Swain-Phipps E. K., Fuller A. J., Wickham S. M., Daniels N., Fourcy E., Fournier M., Frasca B., Meert K., Mikusova A., Olin M., Poškas R. [LEI], Scales C.. Strategic Study of Thermal Treatment of European Radioactive Wastes In: IOP Conference Series: Materials Science and Engineering 4-5 February 2020 Manchester. Manchester: IOP Publishing, 2020, Vol. 818, 012002, p. 1-9. ISSN 1757-899X.
Narkūnas E. [LEI], Šmaižys A. [LEI], Poškas P. [LEI]. Preliminary inventory of C-14 in irradiated graphite of Ignalina NPP unit 1 RBMK-1500 reactor In: EURADWASTE ’19 Conference Proceedings 9th European Commission Conference on EURATOM Research and Training in Radioactive Waste Management 4-7 June, 2019 Pitesti, Romania . Luxembourg: European Union, 2020, p. 682. ISBN 978-92-79-98750-2.
Grigaliūnienė D. [LEI], Poškas P. [LEI], Kilda R. [LEI], Narkūnas E. [LEI]. Estimation of 14C release and migration from RBMK-1500 reactor graphite disposed of in a potential geological repository in crystalline rocks in Lithuania In: EURADWASTE ’19 Conference Proceedings 9th European Commission Conference on EURATOM Research and Training in Radioactive Waste Management 4-7 June, 2019 Pitesti, Romania. Luxembourg: European Union, 2020, p. 681. ISBN 978-92-79-98750-2.

2019

Wendling J., Justinavičius D. [LEI], Sentis M., Amaziane B., Bond A., Calder J. N., Treille E.. Gas transport modelling at different spatial scales of a geological repository in clay host rock In: Environmental Earth Sciences. New York: Springer, 2019, Vol. 78, No. 221, p. 1-34. ISSN 1866-6280.
Poškas R. [LEI], Šimonis V. [LEI], Jouhara H., Poškas P. [LEI]. Modeling of decay heat removal from CONSTOR RBMK-1500 casks during long-term storage of spent nuclear fuel In: Energy. Oxford: Elsevier, 2019, Vol. 170, p. 978-985. ISSN 0360-5442, eISSN 1873-6785.
Poškas P. [LEI], Kilda R. [LEI], Šimonis A. [LEI], Jouhara H., Poškas R. [LEI]. Disposal of very low-level radioactive waste: Lithuanian case on the approach and long-term safety aspects In: Science of the Total Environment. Amsterdam: Elsevier, 2019, Vol. 447, p. 464-474. ISSN 0048-9697.
Poškas G. [LEI], Poškas P. [LEI], Šimonis A. [LEI]. Assessment of the Radioactive Contamination of the RBMK-1500 Reactor’s Steam Pipelines and High Pressure Rings In: Science and Technology of Nuclear Installations. London: Hindawi, 2019, p. 1-8. ISSN 1687-6075, eISSN 1687-6083.
Narkūnas E. [LEI], Poškas G. [LEI], Šmaižys A. [LEI]. Impact of shield elements on the WWER-440 reactor pressure vessel activation In: Annals of Nuclear Energy. Oxford: Elsevier, 2019, Vol. 130, p. 394-401. ISSN 0306-4549.
Miliauskas G., Maziukienė M., Jouhara H., Poškas R. [LEI]. Investigation of mass and heat transfer transitional processes of water droplets in wet gas flow in the framework of energy recovery technologies for biofuel combustion and flue gas removal In: Energy. Oxford: Elsevier, 2019, Vol. 173, p. 740-754. ISSN 0360-5442, eISSN 1873-6785.
Šmaižys A. [LEI], Narkūnas E. [LEI], Rudychev V., Rudychev Y.. Analysis of Some Computer Codes Used for Evaluation of Spent Nuclear Fuel Radiation Parameters In: Nuclear and Radiation Sofety. 2019, Vol. 3, No. 83, p. 44-50. ISSN 2073-6231.
Alyokhina S., Matsevity Y., Dudkin V., Poškas R. [LEI], Sirvydas A. [LEI], Račkaitis K., Zujus R. [LEI]. Comparative analysis of numerical methods used for thermal modeling of spent nuclear fuel dry storage systems In: Problems of atomic science and technology. 2019, No. 5, p. 75-79. ISSN 1562-6016.
Ahn S., Asghar M., Babesany B., Blideanu V., Boursie N., Narkūnas E. [LEI], et al. Methodologies for assessing the induced activation source term for use in decommissioning applications In: Safety Reports Series No. 95. Vienna: IAEA, 2019, No. 95, p. 128. ISSN 1020–6450 ISBN 978-92-0-102918-8.

2018

Striūgas N. [LEI], Pedišius N. [LEI], Poškas R. [LEI], Valinčius V. [LEI]. Sewage sludge gasification with plasma processing In: Conference proceedings 5th International Conference on Renewable Energy Gas Technology . Toulouse, France: REGATEC, 2018, p. 129-130. ISBN 978-91-981149-4-2.
Šimonis A. [LEI], Poškas G. [LEI], Poškas P. [LEI]. Estimation of the radiation doses during the dismantling of the equipment in Building 117/1 at the Ignalina NPP In: Annals of Nuclear Energy. Oxford, England: Elsevier, 2018, 121, p. 29-35. ISSN 0306-4549.
Poškas R. [LEI], Sirvydas A. [LEI], Jouhara H., Poškas P. [LEI]. Investigation of characteristics of solid particles from a mixture of sewage sludge and wood pellets synthetic gas and their clean-up In: Waste management. Oxford: Elsevier, 2018, Vol. 78, p. 1-7. ISSN 0956-053X.
Poškas P. [LEI]. Progress on Nuclear Waste Management. Nuclear Waste Governance in Lithuania In: Challenges of Nuclear Waste Governance: An International Comparison. Germany: Springer Fachmedien Wiesbaden GmbH, 2018, Vol. II, p. 139-160. ISBN 978-3-658-21440-1, eISBN 978-3-658-21441-8.
Poškas R. [LEI], Sirvydas A. [LEI], Poškas P. [LEI], Jouhara H., Striūgas N. [LEI], Pedišius N. [LEI], Valinčius V. [LEI]. Investigation of warm gas clean-up of biofuel flue and producer gas using electrostatic precipitator In: Energy. Oxfordas: Elsevier, 2018, Vol. 143, p. 943-949. ISSN 0360-5442.
Poškas R. [LEI], Sirvydas A. [LEI], Poškas P. [LEI], Jouhara H., Striūgas N. [LEI], Pedišius N. [LEI], Valinčius V. [LEI]. Investigation of warm gas clean-up of biofuel flue and producer gas using electrostatic precipitator In: Energy. 2018, Vol. 143, p. 943-949. ISSN 0360-5442.

2017

Poškas R. [LEI], Sirvydas A. [LEI], Poškas P. [LEI], Striūgas N. [LEI], Pedišius N. [LEI], Valinčius V. [LEI]. Investigation of the biofuel flue and producer gases cleaning efficiency using ESP In: E3S Web of Conferences. 7 November 2017. Didžioji Britanija . EDP Sciences, 2017, Vol.22, p. 1-7..
Detilleux V., Pellegrini D., Bernier F., Heriard-Dubreuil G., Miksova J., Narkūnienė A. [LEI]. Overview of the strategic research Agenda in the field of safety of radioactive waste geological disposal developed by the Expertise Function in the EC-H2020-SITEX-II project In: Proceedings of the EUROSAFE Forum 2016 Munich, 7 - 8 November 2016. Germany: Gesellschaft für Anlagen- und Reaktorsicherheit (GRS) gGmbH, 2017, p. 149-160. ISBN 978-3-946607-33-5.
Narkūnienė A. [LEI], Rocher M., Metcalf P., Detilleux V., Bernier F., Dewoghelaere J., Mrskova A., Miksova J., Lange K.. SITEX-II experience in training and tutoring for reviewing a safety case for geological disposal In: Proceedings of the EUROSAFE FORUM 2017 Paris, 6-7 November 2017. Prancūzija: IRSN, 2017, p. 239-246. ISBN 978-2-9545237-8-1.
Poškas P. [LEI]. Approach to Disposal of Radioactive Waste and Spent Nuclear Fuel in Lithuania (LBNL-1006984) In: International Approaches for Deep Geological Disposal of Nuclear Waste: Geological Challenges in Radioactive Waste Isolation Fifth Worldwide Review. JAV: Lawrence Berkeley National Laboratory Sandia National Laboratories, 2017, p. 1-15..
Šmaižys A. [LEI], Poškas P. [LEI], Narkūnas E. [LEI]. Evaluation of dose rate variation during very long term storage of RBMK-1500 reactor used fuel In: Annals of Nuclear Energy. 2017, Vol. 109, p. 192-198. ISSN 0306-4549.
Striūgas N. [LEI], Valinčius V. [LEI], Pedišius N. [LEI], Poškas R. [LEI], Zakarauskas K. [LEI]. Investigation of sewage sludge treatment using air plasma assisted gasification In: Waste Management. 2017, Vol. 64, p. 149-160. ISSN 0956-053X.
Poškas R. [LEI], Sirvydas A. [LEI], Poškas P. [LEI], Šimonis V. [LEI], Jankauskas J. [LEI]. Investigation of the ESP cleaning efficiency of the flue gases in the wide range of Re numbers In: Mechanika. 2017, Vol. 23, No. 1, p. 47-54. ISSN 1392-1207.
Poškas R. [LEI], Šimonis V. [LEI], Poškas P. [LEI], Sirvydas A. [LEI]. Thermal analysis of CASTOR RBMK-1500 casks during long-term storage of spent nuclear fuel In: Annals of Nuclear Energy. 2017, Vol. 99, p. 40-46. ISSN 0306-4549.

2016

Grigaliūnienė D. [LEI], Poškas P. [LEI], Kilda R. [LEI]. Waste zone conceptual model effect on predicted radionuclide flux from near surface repository In: Book of papers Session 3b VLLW of International Conference on the Safety of Radioactive Waste Management (IAEA, CN-242). 2017). Vienna Austria: IAEA, 2016, p. 38-41..
Detilleux V., Pellegrini D., Bernier F., Dubreuil G.H., Miksova J., Narkūnienė A. [LEI]. Overview of the Strategic Research Agenda in the field of safety of radioactive waste geological disposal developed by the Expertise Function in the EC-H2020-SITEX-II project In: Proceedings of the EUROSAFE Forum 2016 Munich, 7 and 8 November 2016. Munich, Germany: GRS, 2016, p. 149-160. ISBN 978-3-946607-33-5.
Pellegrini D., Bernier F., Detilleux V., Dubreuil G.H., Narkūnienė A. [LEI], Miksova J., Rocher M.. SITEX, the European network of technical expertise organisations for geological disposal In: Book of papers of International Conference on Safety of Radioactive Waste Management, 21–25 November 2016 Vienna, Austria. Vienna: IAEA, 2016, p. 33-37..
Miksova J., Nachmilner L., Pellegrini D., Rocher M., Detilleux V., Bernier F., Narkūnienė A. [LEI], Dubreuil G.H.. Horizon2020 – Project SITEX-II In: Book of Contributed papers of International Conference on Effective Nuclear Regulatory Systems, April 11–15, 2016, Vienna, Austria. Vienna: IAEA, 2016, p. 230-237..
Poškas P. [LEI], Grigaliūnienė D. [LEI], Justinavičius D. [LEI], Kilda R. [LEI], Narkūnienė A. [LEI]. Pažanga įgyvendinant radioaktyviųjų atliekų atliekynus Lietuvoje ir jų saugos vertinimas In: Energetika. Vilnius: Lietuvos mokslų akademija, 2016, T. 62, Nr. 3, p. 171-188. ISSN 0235-7208.
Ragaišis V. [LEI], Poškas P. [LEI], Šimonis V. [LEI], Narkūnas E. [LEI]. Updating of the public dose assessment approach for decommissioning related releases from the Ignalina NPP In: Annals of Nuclear Energy. Oxford, England: Elsevier, 2016, Vol. 94, p. 93-101. ISSN 0306-4549.
Narkūnas E. [LEI], Šmaižys A. [LEI], Poškas P. [LEI], Bartkus G. [LEI]. Modelling of the spatial distribution of the induced activities in the RBMK-1500 reactor graphite blocks and rings/sleeves In: Progress in Nuclear Energy. Oxford, England: Elsevier, 2016, Vol. 91, p. 265-276. ISSN 0149-1970.
Narkūnas E. [LEI], Šmaižys A. [LEI], Poškas P. [LEI], Ragaišis V. [LEI]. Modelling of RBMK-1500 SNF storage casks activation during very long term storage In: Applied Radiation and Isotopes. Netherlands: Elsevier, 2016, Vol. 115, p. 100-108. ISSN 0969-8043.
Poškas P. [LEI], Grigaliūnienė D. [LEI], Narkūnienė A. [LEI], Kilda R. [LEI], Justinavičius D. [LEI]. Modeling of irradiated graphite 14C transfer through engineered barriers of a generic geological repository in crystalline rocks In: Science of the Total Environment. Netherlands: Elsevier, 2016, Vol. 569-570, p. 1126-1135. ISSN 0048-9697.
Justinavičius D. [LEI], Poškas P. [LEI], Narkūnienė A. [LEI]. Gas migration modelling in geological repository module in clay formation and sensitivity analysis In: Engineering Geology. Amsterdamas: Elsevier, 2016, Vol. 213, p. 158-168. ISSN 0013-7952.
Poškas G. [LEI]. Radiologinio užteršimo vertinimas RBMK-1500 reaktoriaus kontrolės ir apsaugos kanaluose In: Šilumos energetika ir technologijos-2016: konferencijos pranešimų medžiaga, Kauno technologijos universitetas, 2016 sausio 28-29. Kaunas: Lietuvos energetikos institutas, 2016, p. 98-103. ISSN 2335-2485.
Barinova E., Beer H. F., Bradbury D., Dunzik-Gougar M. L., Fachinger J., Hand R., Jones A., Karlina O., Kascheev V., Lamouroux C., Laurent G., Leganes Nieto J. L., Li J. F., Lindberg M., Metcalfe M. P., Narkūnas E. [LEI], Norris S., Ojovan M. I., Oryšaka A., Petit L., Poškas P. [LEI], Rahmani L., Tomlinson T., von Lensa W., Wickham A. J., Zlobenko B.. Processing of irradiated graphite to meet acceptance criteria for waste disposal In: IAEA TECDOC-1790. Vienna: International Atomic Energy Agency, 2016, p. 1-148. ISSN 1011-4289 ISBN 978-92-0-104016-9.

2015

Narkūnienė A. [LEI]. Nepriklausomos techninės ekspertizės tinklas radioaktyviųjų atliekų šalinimo srityje: bendradarbiavimas ir įgyvendinimas ( SITEX-II projektas) In: Energetika. (Kronika) [EBSCO, IndexCopernicus, SCOPUS]. Vilnius: Lietuvos mokslų akademija, 2015, T. 61, Nr. 3-4, p. 11-12. ISSN 0235-7208.
Poškas R. [LEI], Sirvydas A. [LEI]. Elektrostatinio filtro panaudojimo galimybės sintetinėms dujoms išvalyti In: Šilumos energetika ir technologijos - 2015: konferencijos pranešimų medžiaga, Kauno technologijos universitetas, 2015 sausio 29-30 . Kaunas: Kauno technologijos universitetas, 2015, p. 33-36. ISSN 2335-2485.
Poškas G. [LEI]. Sistemų komponentų paviršinio radioaktyviojo užterštumo neapibrėžtumo vertinimo aspektai In: Šilumos energetika ir technologijos - 2015: konferencijos pranešimų medžiaga, Kauno technologijos universitetas, 2015 sausio 29-30 . Kaunas: Kauno technologijos universitetas, 2015, p. 120-124. ISSN 2335-2485.
Zujus R. [LEI]. Trimatis mišrios konvekcijos modeliavimas vertikaliame plokščiame kanale In: Šilumos energetika ir technologijos - 2015: konferencijos pranešimų medžiaga, Kauno technologijos universitetas, 2015 sausio 29-30 . Kaunas: Kauno technologijos universitetas, 2015, p. 145-151. ISSN 2335-2485.
Striūgas N. [LEI], Pedišius N. [LEI], Poškas R. [LEI], Valinčius V. [LEI]. Development of innovative thermal decomposition technology and its application for utilization of sewage sludge In: 23rd European Biomass Conference and Exhibition (Session 2CO.2.3) . Vienna: 2015, p. 546-549. ISBN 978-88-89407-516.
Poškas R. [LEI], Sirvydas A. [LEI], Jankauskas J. [LEI]. Elektrostatinio filtro efektyvumo tyrimas deginant biokurą mažos galios katile In: Energetika. Vilnius: Lietuvos mokslų akademija, 2015, T. 61, Nr. 3-4, p. 131-140. ISSN 0235-7208.
Poškas G. [LEI], Zujus R. [LEI]. Modelling of the Radiological Contamination of the RBMK-1500 reactor control and protection system channels’ cooling circuit (http://dx.doi.org/10.4236/wjet.2015.33C001) In: World Journal of Engineering and Technology. Scientific research publishing, 2015, p. 1-5. ISSN 2331-4222.
Poškas R. [LEI], Gediminskas A. [LEI], Sirvydas A. [LEI]. 3D modelling of airflow distribution in small scale food product dryer In: Proceedings of the 7th Baltic heat transfer conference. Tallinn: Talino technologijos universitetas, 2015, p. 267-272. ISBN 978-9949-23-817-0.
Poškas G. [LEI]. Derivation of the mass factors for decommissioning cost estimation of low contaminated auxiliary systems. In: International Conference ECED 2013 – Eastern and Central European Decommissioning June 23 - 25, 2015. . Trnava, Slovakia: 2015, p. 1-9. ISBN 978-80-971498-5-7.
Poškas G. [LEI], Zujus R. [LEI]. Modelling of the Radiological Contamination of the RBMK-1500 reactor control and protection system channels’ cooling circuit In: World Journal of Engineering and Technology. Scientific research publishing, 2015, p. 1-5. ISSN 2331-4222.
Ragaišis V. [LEI], Poškas P. [LEI], Šimonis A. [LEI]. Methodology for the scoping assessment of radioactive releases during dismantling of RBMK-1500 reactor systems with low-level contamination In: Annals of Nuclear Energy. Oxford: Elsevier, 2015, Vol. 75, p. 193-198. ISSN 0306-4549.
Poškas P. [LEI], Narkūnienė A. [LEI], Grigaliūnienė D. [LEI]. Overview of the Lithuanian programme for disposal of RBMK-1500 spent nuclear fuel In: Mineralogical Magazine. United Kingdom: The Minerological Society, 2015, Vol. 79 (6), p. 1581-1589. ISSN 0026-461X.
Narkūnienė A. [LEI], Poškas P. [LEI], Kilda R. [LEI], Bartkus G. [LEI]. Uncertainty and sensitivity analysis of radionuclide migration through the engineered barriers of deep geological repository: Case of RBMK-1500 SNF In: Reliability Engineering & System Safety. London: Elsevier, 2015, Vol. 136, p. 8-16. ISSN 0951-8320.
Justinavičius D. [LEI], Poškas P. [LEI]. Temperature and tortuosity effect on gas migration in a high-level waste disposal tunnel In: Mineralogical Magazine. 2015, Vol. 79 (6), p. 1317-1325. ISSN 0026-461X.
Ragaišis V. [LEI], Ahmad S.. Methodology for safety assessment applied to predisposal waste management In: Methodology for safety assessment applied to predisposal waste management. Vienna: International Atomic Energy Agency, 2015, p. 1-47. ISSN 1011-4289 ISBN 978-92-0-109215-1.
Poškas G. [LEI], Zujus R. [LEI], Poškas P. [LEI]. Analysis of the radiological contamination of the RBMK-1500 reactor low salted water system In: Progress in Nuclear Energy. Oxford: Elsevier, 2015, Vol. 85, p. 707-712. ISSN 0149-1970.
Šimonis A. [LEI], Poškas P. [LEI], Poškas G. [LEI], Grigaliūnienė D. [LEI]. Modeling of the radiation doses during dismantling of RBMK-1500 reactor emergency core cooling system large diameter pipes In: Annals of Nuclear Energy. Oxford: Elsevier, 2015, Vol. 85, p. 159-165. ISSN 0306-4549.

2014

Justinavičius D. [LEI], Sirvydas A. [LEI], Poškas P. [LEI]. Thermal analysis of reference repository for RBMK-1500 spent nuclear fuel in crystalline rocks In: Journal of thermal analysis and calorimetry. 2014, Vol. 118, No. 2, p. 767-773. ISSN 1388-6150.

2011

Lygaitis R., Grazulevicius J. V., Vaitkevičienė V. [LEI], Jankauskas V.. Electroactive Twin Compounds Containing Trioxothioxanthene Electron Accepting Moieties In: Molecular crystals and liquid crystals. Abingdon: Taylor & Francis, 2011, Vol. 535, Iss. 1, p. 189-195. ISSN 1542-1406, eISSN 1563-5287.

Projects

International projects

Horizon 2020

1

The Objective: The European Green Deal, an ambitious growth strategy aligned with the Sustainable Development Goals (SDG), calls for the mobilization of the industry. Indeed, while iMore

2

The decommissioning of closed graphite moderated nuclear reactors worldwide is still in its early stages with the majority of reactors in “safe store” condition. For these reactors, tMore

3
EURAD project logo

Following decades of RD&D in support of the safe management and disposal of radioactive waste, and building on the preparatory work of the recent EC JOPRAD project, a European JoiMore

4
SHARE project logo

According to the projections based on likely remaining life-times of the World’s legacy nuclear fleet, the workload and budgets to be dedicated for nuclear decommissioning is going toMore

5

Safe management of radioactive waste is challenging to waste producers and waste management organisations. Deployment of thermal treatment in an optimised waste management lifecycle cMore

6
SITEX-II

The coordination action SITEX-II aims at implementing in practice the activities along with the interaction modes issued by the FP7 program SITEX project (2012-2013), in view of develMore

Seventh Framework Programme (FP7)

1

The ARCADIA project has been conceived so as to provide a twofold support to the further development of nuclear research programs in the NMS, targeting two major areas included in theMore

2

The objective of PLATENSO is to provide a proposal towards establishing the legal base for a European Entity on Socio-Economic matters linked to nuclear technology and to develop recoMore

3

NEWLANCER project proposes to identify and implement effective and efficient actual solutions leading to enlarged NMS involvement in future Euratom Framework Programmes by strengtheniMore

4

Gas-Cooled Reactors (GCR), RBMK and some Material Test Reactors (MTR) make use of graphite as moderator of the fuel, structures of the core and/or thermal columns. During operation, tMore

IAEA

1

The present spent nuclear fuel (SNF) management concept in the Lithuania foresees dry storage of SNF for 50 years. During this time the final SNF management concept shall be developedMore

2

Coordinator: Lithuanian Energy Institute (LEI)More

4

Coordinator: Lithuanian Energy Institute (LEI), LithuaniaMore

5

Coordinator: Lithuanian Energy Institute (LEI)More

Other international projects

1

The goal of this project is to prepare the setting up of a “Joint Programming on Radioactive Waste Disposal” that would be established to coordinate at the European level, national reMore

Projects in Lithuania

Research Council of Lithuania projects

1
2014–2020 ES fondų investicijų ženklas

Lietuvos energetikos institutas įgyvendina projektą „Dalyvavimas 29-ojoje tarptautinėje mokslinėje konferencijoje “Nuclear Energy for New Europe NENE 2020” Nr. 09.3.3-LMT-K-712-20-003More

Personnel

Name, surname Position Office phone. e-mail
Povilas Poškas Head (Chief research associate) 62-BRK +37037401891 Povilas.Poskas@lei.lt
Gytis Bartkus Research associate 78-BRK +37037401902 Gytis.Bartkus@lei.lt
Gražvydas Būdvytis Engineer 65-BRK +37037401882 Grazvydas.Budvytis@lei.lt
Tomas Dabašinskas Lathe operator 79-BRK +37037401985
Valantinas Dabašinskas Machinist 77-BRK +37037401884
Dalia Grigaliūnienė Senior research associate 53-BRK +37037401992 Dalia.Grigaliuniene@lei.lt
Jurgis Jankauskas Junior research associate 78-BRK +37037401902 Jurgis.Jankauskas@lei.lt
Darius Justinavičius Research associate 64-BRK +37037401886 Darius.Justinavicius@lei.lt
Raimondas Kilda Senior research associate 53-BRK +37037401992 Raimondas.Kilda@lei.lt
Vladislavas Kulkovas PhD student 65-BRK +37037401882 Vladislavas.Kulkovas@lei.lt
Ernestas Narkūnas Senior research associate 54-BRK +37037401890 Ernestas.Narkunas@lei.lt
Asta Narkūnienė Senior research associate 64-BRK +37037401886 Asta.Narkuniene@lei.lt
Robertas Poškas Chief research associate 52-BRK +37037401893 Robertas.Poskas@lei.lt
Gintautas Poškas Senior research associate 61-BRK +37037401883 Gintautas.Poskas@lei.lt
Kęstutis Račkaitis Expert 61-BRK +37037401883 Kestutis.Rackaitis@lei.lt
Valdas Ragaišis Senior research associate 58-BRK +37037401889 Valdas.Ragaisis@lei.lt
Arūnas Sirvydas Senior research associate 60-BRK +37037401888 Arunas.Sirvydas@lei.lt
Sigita Subačiūtė Projects administrator 63-BRK +37037401887 Sigita.Subaciute@lei.lt
Vytautas Šimonis Senior research associate 60-BRK +37037401888 Vytautas.Simonis@lei.lt
Audrius Šimonis Senior research associate 78-BRK +37037401902 Audrius.Simonis@lei.lt
Artūras Šmaižys Chief research associate 54-BRK +37037401890 Arturas.Smaizys@lei.lt
Renoldas Zujus Junior research associate 51-BRK +37037401892 Renoldas.Zujus@lei.lt

Services

Database Management
Database Creation and Management.
Organizing, filtering and sorting large volumes of tasks, projects and resources
Using the Primavera software, a professional large-scale, complex, multi-layered, modern project management and planning is performed.
Design of nuclear facilities and packages and nuclear and radiation safety analysis of systems containing nuclear and radioactive materials
Evaluation of neutron multiplication coefficient of system, modelling of ionizing radiation and radiation shielding parameters.
Modelling of neutron, photon and electron transfer
The software is used for separate neutron, photon, electron or combined neutron, photon and electron transfer simulation and for calculations of critical neutron multiplication coefficient.
High performance calculations
A computer system designed to carry out complex tasks in science and technology requiring a high level of computer resources.
Evaluation of fire using a specialized software package
Fire evaluation (simulation) in both nuclear and non-nuclear energy facilities during their operation and during decommissioning.
Measurements of particulate concentration in air / gas
Determination of the amount and size of particulates emitted with combustion products.
Determination of pollutants (radionuclides) in various water / solid phase systems
With the assist of geochemical model the models of the course and duration of chemical processes occurring in the water / solid phase systems are created for the simulation of chemical changes, solubility and sorption of pollutants in water / solid phase systems.
Atmospheric rainfall-water cycle modeling
The Gardenia model simulates atmospheric rain-water cycles, from their appearance on the ground up to the leakage.
Statistical analysis, experimental data processing, process optimization
The tasks solvation of various branches of science (technical, engineering, economics, etc.).
Modelling the diffusion of emissions from various sources
The software is used to calculate the dry and wet pollutant sedimentation and to assess the concentrations of pollutants in the air
Professional management of complex multi-purpose projects
Using “Microsoft Project” software a large amount of tasks, projects, and resources are organized, filtered and sorted.
Simulation of emissions and degradation of pollutants (radionuclides) in the natural environment and engineering systems
Modelling of the distribution of pollutants (radionuclides) in the environment and engineering systems.
Surface temperature visualization and measurement
Contactless thermal analysis of solids (important for the analysis of the influence of hard surface tension, for the determination of surface overheating hazards), thermal analysis on micro surfaces (in electronic circuits), contactless analysis of fluid temperature
A specialized equipment complex for measuring of flow velocity and temperature and their pulsations
Laser visualization of the flow (in various shapes channels, pipes, tanks) and a comprehensive analysis Compressor for compressed air supply. Additional processing of signals obtained from thermocouples
A specialized equipment complex for visualization of the flow structure
Laser visualization of the flow (in various shapes channels, pipes, tanks) and a comprehensive analysis Compressor for compressed air supply. Additional processing of signals obtained from thermocouples
Modelling of mass transfer processes in dynamically changing complex engineering and / or natural systems
Modeling of mass motion in engineering and natural environment using numerical methods.
Lease of a seminar room (this service does not directly relate to the scientific activity of the laboratory)
20 seats seminar room with information display device (interactive whiteboard)
Estimation of irradiation of gamma radiation scattered in atmosphere
The software is aimed for modelling of the radiation doses of ionizing gamma radiation.
Modeling of Fluid Flows and Heat Transfer in Porous/Slotted Environment
Simulation of fluid flow and heat transfer through different earth layers.
Translation of technical text
Using the PROMT NET Professional software the technical text from Russian into English and from English to Russian is translated.
Design of two-dimensional and three-dimensional technological systems, graphic representation
Using Autocad MEP software the design documentation (drawings) are prepared, complex two-dimensional and three-dimensional (spatial) structures are constructed