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Assoc. Prof. Dr. Leon Cizelj
Head, Reactor Engineering Division
Jozef Stefan Institute
Jamova 39

SI-1000 Ljubljana

Slovenia
Phone: (+386) 1 5885 215
Fax: (+386) 1 5885 377
Email: leon.cizelj@ijs.si

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Biographical Sketch

Born on January 1, 1964, in Celje. On the search for a proper profession (not to mention the sense of the life) I learned how to play clarinet and saxophone, spent some time by driving trucks, married Romana and became a father of two sons. Finally, I decided to become a mixture of a researcher and consultant in the exciting field of Nuclear Engineering. My spare time used to be divided between my family and playing clarinet and saxophone in a big band called �abe ( Frogs in English). Recently, my family is very happy since I am spending my free time with them. The Frogs are not so happy since I promised to make a come back soon.


Research Interests

Computational Structural Mechanics
Micromechanics
Probabilistic Fracture Mechanics
Safety of Complex Technologies
Safety, Reliability, Inspection and Maintenance of Crack-Containing Structures
Aging of Steam Generators in Nuclear Power Plants

Education

Ph.D. in Physics, University of Ljubljana, Faculty of Mathematics and Physics, Nuclear Engineering Program, 1993
M.Sc. in Nuclear Engineering, University of Ljubljana, Faculty of Mathematics and Physics, Nuclear Engineering Program, 1989
B.Sc. in Mechanical Engineering, University of Maribor, Faculty of Mechanical Engineering, 1986


Awards

1986 Kidri�'s award for students of University of Maribor (with Darko Ogrizek)
1994 The Jo�ef Stefan Golden Emblem Prize Award for Ph. D. Thesis


Teaching

Structural Mechanics
Fracture Mechanics

at Graduate School for Nuclear Engineering (member of ENEN Association).


Professional Experience

Since 1986 with Jo�ef Stefan Institute, Reactor Engineering Division. Professional experience includes:
  • Development and application of probabilistic fracture mechanics techniques;
  • Finite element modeling (FAM) and analysis (PAFEC-FE, ABAQUS) of complex geometries and nonlinear materials;
  • Quality assurance and standardization in finite element methods (NAFEMS);
  • System administration of Unix and Windows workstations and small networks;
  • Member of Committee for Applied Research at Scientific Council of "Jo�ef Stefan" Institute (1996-2000);
  • Member of Committee for Intelectual Property of "Jo�ef Stefan" Institute (1998-2002, 2002-2006, 2006-2010);
  • Member of Committee for methodolgy of research work appraisal at Scientific Council of "Jo�ef Stefan" Institute (2005-).
  • Member of the Scientific Council for Technology at the Slovenia Research Agency (ARRS).


Professional Societies

Nuclear Society of Slovenia (NSS); Founding Member; Auditor 1996-1998; Board Member 1998-2002
European Nuclear Society (ENS); Member Since 1991;
American Society of Mechanical Engineers (ASME); Member Since 1995; Correspondent for Slovenia since 1997; Member of the District H operating Board
Slovensko dru�tvo za mehaniko (Slovenian Society for Mechanics);Member Since 1988.
SATENA (Slovenian Association of Technical and Natural Sciences); Member Since 2000, Board Member 2009-2011.


Selected Publications

 

See also complete list of publications available at COBISS.

Links to on-line publications are available through the Digital Object Identifier System DOI.

 L. Cizelj, I. Simonovski,  Microstructurally Short Cracks in Polycrystalls Described by Crystal Plasticity, Nova Science Publishers, (in print 2010) . [Preprint]
 I. Simonovski, B. Kon�ar, L. Cizelj, Thermo-mechanical analysis of a DEMO divertor cooling finger under the EFREMOV test conditions, Fusion Enginnering and Design 85 (2010) 130-137. [Preprint]
I. Simonovski, L. Cizelj, The influence of the grain structure size on microstructurally short cracks, ASME Engineering for Gas Turbines and Power 131(2009) 042903-1-042903-8. [Preprint]
L. Cizelj, M. Leskovar, M. �epin, B.Mavko, A method for rapid vulnerability assessment of structures loaded by outside blasts, Nuclear Engineering and Design 239 (2009) 1641-1646. [Preprint]

I. Simonovski, K.-F. Nillson, L. Cizelj, Microstructurally Small Cracks in 316L Steel and Their Dependance on Crystallographic Orientations of Grains, Fatigue and Fracture of Engineering Materials and Structures 20 (2007) 463-478. [Preprint]
I. Simonovski, K.-F. Nillson, L. Cizelj, The Influence of Crystallographic Orientation on Crack Tip Displacements of Microstructurally Small, Kinked Crack Crossing the Grain Boundary, Computational Materials Science 39 (2007) 817-828. [Preprint]
I. Simonovski, L. Cizelj, The Influence of Grains' Crystallographic Orientations on Advancing Short Cracks, International Journal of Fatigue 29 (2007) 2005-2014. [Preprint]
G. Roussel, L. Cizelj, Reliability Of Sampling Inspection Schemes Applied To Replacement Steam Generators, Journal of Pressure Vessel Technology ASME 129 (2007) 109-117. [Preprint]
M. �epin, L. Cizelj, M. Leskovar, B. Mavko, Vulnerability Analysis of a Nuclear Power Plant Considering Detonations of Explosive Devices, Journal of Nuclear Science and Technology 43 (2006) 1258-1269. [Preprint]
L. Cizelj, M. Leskovar, B. Kon�ar,Vulnerability of a partially flooded PWR reactor cavity to a steam explosion, Nuclear Engineering and Design 236 (2006) 1617-1627. [Preprint]
L. Cizelj, Probability Of Excessive Leak Rate Through Multiple Defects In Degraded Nuclear Steam Generator Tubes, Invited lecture at ICRESH-05, Mumbai, India (December 2005).
M. Kova�, L. Cizelj, Modeling Elasto-Plastic Behavior of Polycrystalline Grain Structure of Steels at Mesoscopic Level, Nuclear Engineering and Design 235 (2005) 1939-1950. [Preprint]
I. Simonovski, M. Kova�, L. Cizelj, Estimating the correlation length of inhomogeneities in a polycrystalline material, Mater. sci. eng., A Struct. mater. : prop. microstruct. process. 381 (2004) 273-280. [Preprint]
M. Kova�, I. Simonovski, L. Cizelj, Vpliv zrnate strukture na elasto-plastini odziv polikristalnega skupka = The effect of grain structure on the elastic-plastic response of a polycrystalline aggregate, Strojn�iki vestnik 11 (2002) 580-590.
L. Cizelj, H. Riesch-Oppermann, Early Development Of Stress Corrosion Cracks At The Grain Scale: Incomplete Random Tessellation Model, Nuclear Engineering and Design 212 (2002) 21-29. [Preprint]
L. Cizelj, G. Roussel, Probabilistic evaluation of leak rates through multiple defects the case of nuclear steam generators, Fatigue and Fracture of Engineering Materials and Structures 26 (2003) 1069-1079. [Preprint]
S. Weyer, A. Froelich, H.Riesch-Oppermann, L. Cizelj, M.Kova�, Automatic Finite Element Meshing of Planar Voronoi Tesselations, Engineering Fracture Mechanics 69 (2002) 945-958. [Preprint]
L. Cizelj, H. Riesch-Oppermann, Modelling the Early Development of Secondary Side Stress Corrosion Cracks in Steam Generator Tubes Using Incomplete Random Tessellation, Nuclear Engineering and Design 212 (2002) 21-29. [Preprint]
T. Dvor�ek, L. Cizelj, B. Mavko, Safety and Availability of Steam Generator Tubes Affected by Secondary Side Corrosion, Nuclear Engineering and Design 185 (1998) 11-21. [Preprint]
L. Cizelj, I. Hauer, G. Roussel, Ch. Cuvelliez, Probabilistic Assessment of Excessive Leakage through Steam Generator Tubes Degraded by Secondary Side Corrosion, Nuclear Engineering and Design 185 (1998) 347-359. [Preprint]
L. Cizelj, H. Riesch-Oppermann, Stresses in the First Wall of a Dual Coolant Liquid Metal Breeder Blanket During Electron Beam Welding, Fusion Technology 32 (1997)14-22. [Preprint]
L. Cizelj, B. Mavko, P. Vencelj, Reliability of Steam Generator Tubes with Axial Cracks, Journal of Pressure Vessel Technology 118 (1996) 441-446. [Preprint]
L. Cizelj, B. Mavko, H.Riesch-Oppermann, A.Brckner-Foit, Propagation of Stress Corrosion Cracks in Steam Generator Tubes, Int J Press Ves & Piping 63 (1995) 35-43. [Preprint]
L. Cizelj, B. Mavko, On the Risk-Based Steam Generator Lifetime Optimisation, Theoretical and Applied Fracture Mechanics 23 (1995) 129-137. [Preprint]
L. Cizelj, B. Mavko, H. Riesch-Oppermann, Application of First and Second Order Reliability Methods in the Safety Assessment of Cracked Steam Generator Tubes, Nuclear Engineering and Design 147 (1994) 359-368. [Preprint]

Jozef Stefan Institute, Reactor Engineering Division (R4), Jamova cesta 39, SI-1000 Ljubljana, Slovenia
Phone: (+386) 1 588 54 50, Fax: (+386) 1 588 53 77

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