BgNS conference Announcement
Participation Form
PROGRAM of BgNS Conference 2023



The conference “Nuclear energy for the people” will provide a forum for presentation of news and discussions on problems concerning nuclear technology and nuclear applications.

The conference environment shall help in involving and engaging more young professionals in nuclear engineering and applications. The policy of education is a key element in the development of nuclear energy as well as activating and engaging of public toward nuclear applications. Bulgarian and foreign experts and researches, students related to the nuclear energy are invited to take part.


  • Advances in Nuclear technology
  • Education issues in nuclear and radiation
  • NPP Safety and Safety Culture
  • NPP Lifetime Management
  • RAW Management
  • NPP Decommissioning
  • Radiation and environment


 The authors should submit extended abstracts of up to 2 pages (maximum 4000 symbols). The abstract should contain: 1) paper title, 2) authors’ full names and addresses, 3) name, address, phone and e-mail of the author to whom subsequent correspondence should be directed, 4) five keywords in order of importance. The abstract should clearly state background, objectives, results and conclusions. It may contain figures, tables and pictures.

The Organizing Committee will inform you about the acceptance of your paper for oral or poster presentation.


The papers accepted for presentation on the conference are eligible for publishing in the BgNS Science and Technology Journal. Refer to for more information.


The young authors, not older than 35 years, being first author could take part in Young Authors’ Competition (YAC) for Best Presentation.

The Competition Commission will review and evaluate the presented papers. The papers nominated be the Commission will be presented orally at the conference. The rest of the papers could participate in the competition for a best Poster. The best presentations nominated by both, the conference participants and Competition Commission, will be awarded.       

The criteria for evaluating reports for the Competition are: relevance to the conference theme, clear exposition of objectives, subject matter, results and conclusions, accessibility, attractiveness and visualization, balance between text and figures.

The authors should submit full text of the presentation of up to 6 pages. The paper should contain: 1) paper title, 2) name, address, phone and e-mail of the first author, 3) authors’ names and full address, 4) five keywords in order of importance, 5) abstract, and 6) full text.


English and Bulgarian
We kindly ask the reports to be presented by slides in English.


Submission of Participation form and Abstract 25.09.2023
Submission of Full paper for Young Authors Competition 25.09.2023
Notification of acceptance for Young Authors Competition 05.10.2023
Notification of  acceptance  for paper presentation 05.10.2023
Submission of Participation form only 25.10.2023
Conference open 08.11.2023








Members in ALFABET order: Pavlin GROUDEV, Bulgaria, Chair

Bogomil MANCHEV, Bulgaria

Dimitar TONEV, Bulgaria

Fulvio Mascari, Italy

Fabrizio Gabrielli, Germany

Igor Kozlov, Ukraine

Kalin FILIPOV, Bulgaria

Lyuben MARINOV, Bulgaria

Leon CIZEJI, Slovenia

Luis E. Herranz, Spain

Marin CONSTANTIN, Romania

Sandro PACI, Italy

Stanislav GEORGIEV, Bulgaria

Stephan BRUMM, Netherlands

Zoltán HÓZER, Hungary













Mladen Mitev, INRNE-BAS and BgNS President

Krassimira Ilieva, BgNS
Albena Georgieva,
Petya Vryashkova,
Krasteva, INRNE-BAS



The Participation fee is 270 EUR

The early registration, before 30.09.2023, is 230 EUR

Students participation fee is 100 EUR

Accompanying person fee is 80 EUR

The Participation fee includes:

  • Admission to BgNS 2023 Conference
  • Certificate of Participation
  • Publication of an abstract in the Book of Abstracts
  • Oral or poster presentation in Conference session
  • Conference kit
  • Coffee breaks between the sessions
  • Welcome Cocktail
  • Conference Dinner
  • Excursion

The accompanying person fee includes Welcome reception, Conference Dinner, and social event participation.

Participation fee should be paid before 25 October 2023.
The fee should not be reimbursed after 25 October 2023.


Participation fee should be paid via bank transfer:

Bulgarian Nuclear Society, UniCredit Bulbank

IBAN: BG92 UNCR 7630 1208 9962 05,


Specify: your name, BgNS Conference 2022




or fill and send by e-mail Participation form

Conference e-mail:



BgNS, Bulgaria, 1784 Sofia,

72 Tzarigradsko Chaussee Blvd

Petya Vryashkova, BgNS Secretary General

Mobile +359 898 435 141



The BgNS conference will be held at

Meridian Bolyarski Hotel, Veliko Tarnovo
Stefan Stambolov street No. 53 А (+359.62.613.200)

offers special  reduced rates for the conference:

Single room – 78BGN

Double room / for two persons – 110 BGN

The price is per room for night and includes breakfast, parking, fitness and pool in sport center of the hotel, internet access, travel insurance.
The above prices are valid for overnight stays from 06.11 to 12.11 2023.

How to reach The Hotel by car: GPS coordinates – 43.08471, 25.63741


Your booking for The Hotel will be guaranteed if done before 31.10.2023. After this date rooms are provided if available.

We encourage you to make your reservation ON TIME

by e-mail:

Specify in the booking: You name and “for BgNS conference”






Excursion on Veliko Tarnovo

Friday 10.11.2023, 14.00 – 17.00
Medieval Tsarevets Fortress Hill, Samovodska charshia (Bazaar),
Church “St. Forty Martyrs”


Excursion to Arbanassi village:

If you wish to participate, please indicate your interest during the registration process.

The excursion is paid extra. The organizing committee can assist in forming a group of more than 8 people. For individual visits, it is appropriate to use a taxi, which should be requested in a timely manner. Public transport can also be used.

Details will be communicated.




Wednesday, 08.11.2023

16:00 – 18:30


19:30 – 21:30

Welcome Reception

Thursday, 09.11.2023

08:00 – 09:00


09:00 – 11:00

Opening Session

11:00 – 11:30

Coffee break

11:30 – 13:00


13:00 – 14:30


14:30 – 16:00


16:00 – 16:30

Coffee break

16:30 – 17:30


17:30 – 18:30

Posters’ Session

Friday, 10.11.2023

9:00 – 11:00

Young Generation Competition – Oral

11:00 – 11:30

Coffee break

11:30 – 12:00

Young Generation Competition – Poster

12:00 – 13:30


13:30 – 14:30


14:00 – 17:30


  19:30 – 23:00

Conference Diner at Hotel Restaurant

Awarding the best YG presentations

Saturday, 11.11.2023

10:00 – 12:00



12:30- 15:30

Closing of the conference

Excursion to Arbanasi, as desired




Wednesday, 08.11.2023

16:00 – 18:00

Registration, Entrance Hall

19:30 – 22:30

Welcome wine cocktail – Entrance Hall

Thursday, 09.11.2023

08:00 – 09:00

Registration, In front of the Kaloyan Conference Room


                                 Kaloyan Conference Room


Mladen MITEV, BgNS President – Welcome words


Leon CIZELJ, ENS presidentWelcome wordsVideo


Pavlin GROUDEV, Chair of the conference, Opening the Conference




Chairs: Mladen MITEV (INRNE-BAS, BG) and
David WINFIELD (Canada)

09:30 – 09:45

Jiří ŽĎÁREK, UJV Rez, Czech Republic, ’’OFFERR Project Status of Work’’

09:45 – 10:00

Plamen V. PETKOV1, Dimitar Lyutov1, Nikol Borisova2, Boyan Todorov2 and Hristo Iliev1, Sofia University “St. Kliment Ohridski,”, Bulgaria, 1) Faculty of Physics; 2) Faculty of Chemistry and Pharmacy, ’’Overview of Small Modular Reactors (SMR) concept, based on STAR-LM, proposed in Sofia University’’

10:00 – 10:15

Dimitar TONEV, Institute for Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, Bulgaria, ’’Institute for Nuclear Research and Nuclear Energy – Bulgarian Academy of Sciences Activities – 2023’’

10:15 – 10:30

Lyuben MARINOV, Kozloduy NPP, Bulgaria ’’Coal to Nuclear Transition – Advanced nuclear technologies implementation’’

10:30 – 10:45

Rusiyan TSIBRANSKI, Kozloduy NPP, Bulgaria, ’’Participation in Interlaboratory comparissons, a Quality criterion for Radioanalytical Laboratory Measurements’’

10:45 – 11:15

Coffee break




Chairs: Krasen RASHKOV (Kozloduy NPP, BG) and

Viktor KOLYKHANOV (Odessa NPU, UA)

11:15 – 11:30

Angel PAPUKCHIEV, Gesellschaft für Anlagen- und Reaktorsicherheit (GRS) gGmbH, Germany, ’’Coupling of Computational Fluid Dynamics Codes with Structural Mechanics and System Thermal-Hydraulics Programs and Their Validation on Nuclear Reactor Relevant Experiments’’

11:30 – 11:45

Marta PETRUNEAC1, Marin Focșăneanu1, Robert Sîrbu1, Anca-Diana Popescu2 ,1)– Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering, Magurele, 2)– Institute of Archeology “Vasile Pârvan” Bucharest, Romania, ’’Advanced facilities for material analysis at IFIN-HH: a micro-focus X-ray CT study’’

11:45 – 12:00

Lora RAYCHEVA, Georgi Varbanov, EnproConsult Ltd, Bulgaria, ’’Interpretation of the natural hazards parameters for the purpose of PSA’’

12:00 – 12:15

Valentin GEORGIEV1, Petya Vryashkova2, Pavlin Groudev2, 1)Kozloduy NPP, 2)Institute for Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, Bulgaria, ’’Assessment of primary to secondary side leakage for different break sizes of Steam Generator (SG) tube rupture’’

12:15 – 12:30

Petar GORCHEV, Bulgaria, ’’Advanced Passive PWR (AP 1000) Reactor with advanced technology and independent from active forces Passive Safety System’’

12:30 – 12:45

Blagorodka VELEVA1, Jussi Paatero2, Elena Hristova1, 1) National Institute of Meteorology and Hydrology (NIMH), Bulgaria, 2- Finnish Meteorological Institute (FMI), Finland, ’’Studies of atmospheric radioactivity in Bulgaria during the last six decades’’

13:00 – 14:20

Lunch break


Session: POSTERS


and Krassimira ILIEVA (BgNS)

14:30 – 15:20

The posters that will be presented are lied below.

Request for a short (3 min) presentation has to be done preliminary to the chairs.

1.     Victor Kolykhanov1*, Igor Kozlov1, 1)Odesа Polytechnic National University, Faculty of Energy, Odesa, Ukraine, ’’Study of the diffusion neutron flux from point source crossing a flat boundary using Monte-Carlo method’’

2.     I. L. Kozlov, M.О. Holovin, S. V. Vistiak, O. I. Kozlov, Odessa Polytechnic National University, Ukraine, ’’Strategy for the Reliable Power Supply Development Taking into Account the Renewable Energy Sources’’

3.     E. Geleva, D. Tonev, Institute for Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, Bulgaria, ’’Natural radioactivity content in Bulgarian mineral water’’

4.     Krasen Rashkov, Kozloduy NPP, Bulgaria, ’’Constructive Solutions to avoid Containment Bypass in KOZLODUY NPP during severe accidents’’

5.     Tzvetelina Beshirova, Kozloduy NPP, Bulgaria, ’’Core Committee Meeting 2024’’

6.     Ivan Stoyanov, Kozloduy NPP, Bulgaria, ’’Defects in the operation of nuclear fuel – nature and development’’

7.     Greta R. Nedelcheva, Kozloduy NPP, Bulgaria, ’’Formation of SS (surveillance specimens) groups for testing and research’’

8.     Pavel Batalov, Kozloduy NPP, Bulgaria, ’’The contribution of “INVESTMENTS DEPARTMENT” in management of the NPP KOZLODUY investment program’’

9.     Deyan Atanasov, Kozloduy NPP, Bulgaria, ’’The realization of the investment program – a guarantee for the NPP KOZLODUY’s future’’

10. Marin Focșăneanu1, Marta Petruneac1, Robert Sîrbu1, Anca-Diana Popescu2– Hulubei National Institute for R&D in Physics and Nuclear Engineering (IFIN-HH), 2) – Institute of Archeology “Vasile Pârvan” Bucharest, Romania, ’’Non-destructive investigations of various archaeological findings’’

11. L. Dobrev, D. Dimitrova, B. Slavchev, Z. Zahariev, S. Krstevski, Institute for Nuclear Horia Research and Nuclear Energy – Bulgarian Academy of Sciences, ’’Radioanalytical procedure for determination of uranium specific activity in drinking water’’

15:20 – 15:50

Coffee break




Chairs: Albena GEORGIEVA, Nuclear Regulatory Agency, Bulgaria

and Kalin FILIPOV (TU-Sofia, BG)

15:50 – 16:15

Albena GEORGIEVA, Nuclear Regulatory Agency, Bulgaria,’’Human resources development in the nuclear sector. National Strategy and 3-years action plan’’

16:15 – 16:30

Iskren CVETKOV, Kozloduy NPP, Bulgaria, ’’Enhancing the Existing National Nuclear Capacity Building Infrastructure to Support Human Resource Development and Nuclear Knowledge Management Aspects. Attracting the Next Generation of Nuclear Professionals via Interactive Methods and Instruments (BUL 0013 Project, IAEA TC Programme)’’

16:30 – 16:45

Marinela ILIEVA, Abilico AD, Bulgaria, ’’The opportunities for cross-border and multidisciplinary training, provided through the ENEN2plus project, financed by the EC HORIZON EUROPE program’’

16:45 – 17:00

Nadezhda RANDELOVA, NPP Kozloduy, Bulgaria, ’’An open lesson on Aage Niels Bohr with contributions to physics’’

17:00 – 17:15

Venko STOEV, Kozloduy NPP, Bulgaria, ’’Competition for youth nuclear innovation – partnership between Kozloduy NPP and BgNS society’’

17:15 – 17:30

Valentina LAZAROVA, Kozloduy NPP, Bulgaria, ’’Challenge for teenagers – competition on the topic „Nuclear energy – a secure future”


Nevena VELICHKOVA, Kozloduy NPP, Bulgaria, ’’Plan your future in nuclear energy’’

17:45 – 18:00


Friday, 10.11.2023

Kaloyan Conference Room




Chairs: Angel PAPUKCHIEV (GRS gGmbH, Germany) and
Lyuben MARINOV (Kozloduy NPP, BG)

8:30 – 10:30

Oral presentation

For presentation – 15 min


  1. Nikol BORISOVA, Plamen Petkov and Hristo Iliev, Physics department, Sofia University “St. Kliment Ohridski”, Bulgaria, ’’Investigation of Stretching Force Reaction at Normal Conditions of Capillary Bridges for Liquid Solutions Used as VVER-1000 Coolants’’
  2. Galina DIMITROVA, A. Demerdjiev, D. Tonev, Institute for Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, Bulgaria, ’’Assessment of the Radiation Fields Induced by Beam Losses at the INRNE-BAS Cyclotron Facility’’
  3. Viktoria MONDESHKA, Technical University of Sofia, Bulgaria, ’’Analysis and assessment of the significance of nuclear energy in the context of sustainable energy development’’
  4. Petar HRISTOV, Sofia University “St. Kliment Ohridski”, Bulgaria, ‘‘Identification of VVER-1000 nuclear fuel defects‘‘
  5. Ivelina STEFANOVA, Sofia University “St. Kliment Ohridski”, Bulgaria, ‘‘VVER-1000 reactor core internal structure contribution to facilitation of the core design ‘‘
  6.  Tsvetelina YORDANOVA, Sofia University “St. Kliment Ohridski”, Bulgaria, ’’Nuclear fuel cycle implemented in Kozloduy NPP‘‘
  7. Debora MITEVA, Sofia University “St. Kliment Ohridski”, Bulgaria, ’’Primary VVER-1000 circuit capability to perform the function of a safety barrier‘‘
  8. Miglena SHARKOVA 1 and Venelina Boishina 2 , 1)Technical University of Sofia,Bulgaria, 2) University of Chemical Technologies and Metallurgy –Sofia, Bulgaria, ‘‘Approach of using Case-Base Reasoning in combination of Fault Decision Tree for Risk Assessment of NPP Control‘‘

10:30 – 10:35

Voting for oral presentation

10:35 – 10:50

Poster presentation

Request for a short (3 min) presentation has to be done preliminary to the chairs


1        Boris ANASTASOV1, Plamen V. Petkov2, 1International School UWEKIND, 2Sofia University “St. Kliment Ohridski”, ”Nuclear propulsion engines, new ways for travels in space“

2        Branimira MARKOVA, Technical University of Sofia, Bulgaria, ’’Use of small modular reactors for seawater desalination’’

3        Nikolay HRISCHEV, Technical University of Sofia, Bulgaria, ‘‘Radioactive pollution due to human activities‘‘

10:50 – 10:55

Voting for the poster presentation

10:55 – 11:25

Coffee break

11:30 – 15:30

Excursion on Veliko Tarnovo Town


Session: NPP ISSUES AND SAFETY (cont.)


Chairs: Yavor ANDREEV (Theta consult, BG) and

Igor KOZLOV (Odessa NPU, UA)

15:45 – 16:00

Dimitar LAZAROV, Kozloduy NPP, Bulgaria, ’’Defining the isothermal reactivity coefficient of Kozloduy NPP Units 5 and 6 with two positions of the CR control group in a regular reactivity Control Equipment (RCE’)’’

16:00 – 16:15

Ludmil N. NEDELCHEV, Kozloduy NPP, Bulgaria, ’’Prolongation of the terms for irradiation of assemblies with SS in a reactor of the VVER-1000 (B-320) type’’

16:15 – 16:45

Coffee break




Chairs: Lyuben DOBREV (INRNE-BAS, BG) and
Plamen PETKOV (Sofia University “St. Kliment Ohridski, BG)

16:45 – 17:00

Dimitar Lyutov1, NASKO GORUNSKI1, Plamen V. Petkov1*, Boyan Todorov2 and Hristo Iliev1, Sofia University “St. Kliment Ohridski,”, Bulgaria, 1Faculty of Physics, 2Faculty of Chemistry and Farmacy, ’’Experimental study of liquid tin for application in small modular fast reactors (SMFR)’’

17:00 – 17:15

Ion BURDUCEA, G. Velişa, R. F. Andrei, A. Enciu, D. Iancu, D. A. Mirea, A. Spiridon and M. Straticiuc, Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering –IFIN-HH, Magurele, Romania, ’’11 years of experiments at the 3 MV Tandetron from IFIN-HH’’

17:15 – 17:30

Angel DEMERDJIEV, D. Tonev, N. Goutev, G. D. Dimitrova, Institute for Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, Bulgaria ’’Shielding Assessment of the INRNE-BAS Cyclotron facility with the Monte Carlo Code FLUKA’’

17:30 – 17:45

Blagorodka VELEVA 1, B. Slavchev 2, L.Dobrev 2, L.Kinova, D. Dimitrova2, 1) National Institute for Meteorology and Hydrology, 2) Institute for Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, Bulgaria, ’’Application of Alpha Spectrometry for Analyses of Actinides in Low Level Radioactive Waste from Kozloduy NPP”

19:30 – 23:30

Gala dinner, Hotel Restaurant

Awarding the best YG presentations