Skip Ribbon Commands
Skip to main content

Researcher

Profile Picture

Isabella Van Rooyen

Distinguished Staff Scientist

Research Areas:

Biography:
Dr. Isabella van Rooyen is a Distinguished Staff Scientist in the Fuel Design and Development Department at INL where she has led advanced electron microscopy and micro analysis examinations for the Advanced Gas Reactor TRISO Fuel Development Program since 2011. In addition to this role, she is also the principal investigator (PI) of an additive manufacturing U3Si2 fuel research project; the PI or co PI of research projects funded by the National Scientific Users Facilities; and a co PI of three Nuclear Energy University Program research projects and a Nuclear Energy Enabling Technology research project, focusing on SiC-oxide-dispersion-strengthened alloy gradient nanocomposite cladding, fission product transport in TRISO coated particles, advanced manufacturing and developing high-temperature in pile temperature sensors, respectively. Prior to joining INL, Dr. van Rooyen held various technical leadership roles in the nuclear, aerospace, and automotive industries in South Africa, with the most notable research conducted over 12 years in the nuclear arena, which included the Pebble Bed Modular Reactor Company and South African Nuclear Energy Corporation SOC Limited. Dr. van Rooyen has authored or co authored over 30 peer-reviewed journal publications; more than 40 conference papers and presentations; and over 100 company-specific technical/scientific reports, five invention disclosures, and two patents filed on additive nuclear fuel manufacturing processes (2017, 2018). Dr. van Rooyen has affiliate Faculty Member and Graduate Faculty Member status of the Material Science and Engineering Department and Nuclear Engineering Department of the University of Florida. Dr. van Rooyen holds a Ph.D. in Physics, MSc in Metallurgy and an MBA. Dr. van Rooyen was recognized with an INL Laboratory Director’s award for her outstanding scientific paper published during financial year 2014.

Digital Profiles:
Education:

​Ph.D., Physics - Nelson Mandela Metropolitan University

MBA, North West University

M.S., Metallurgy - University of Pretoria

B.S., Metallurgy - University of Pretoria

Affiliations:

​TMS

Women in Nuclear (U.S. and Idaho)

Microanalysis Society (MAS)

Publications:

​Highlighted Publications

I. J. van Rooyen, Y. Q. Wu, and T. M. Lillo, “Identification of Silver and Palladium in Irradiated TRISO Coated Particles of the AGR1 Experiment,” J. Nucl. Mater. 446 (2014) 178-186.


S. Meher, I. J. van Rooyen, T. M. Lillo, A Novel Dual-Step Nucleation Pathway in Crystalline Solids under Neutron Irradiation, Scientific Reports 8, Article number: 98 (2018).

 
H. Wen and I.J. van Rooyen, "Distribution of fission products palladium, silver, cerium and cesium in the un-corroded areas of the locally corroded SiC layer of a neutron irradiated TRISO fuel particle" Journal of the European Ceramic Society, Volume 37, Issue 10, August 2017, Pages 3271-3284.


Jhonathan Rosales, Isabella J van Rooyen, Rita Hoggan, Jason Harp, Clemente Parga, Effect of Si-content on U3Si2 fuel microstructure, JOM DOI: 10.1007/s11837-017-2654-6.


Parga, C.J., I. J. van Rooyen*, B.D. Coryell, W.R. Lloyd, L.N. Valenti, H. Usman, Room Temperature Mechanical Properties of Electron Beam Welded Zircaloy-4 Sheet, Journal of Materials Processing Technology 241 (2017) 73–85 (*corresponding author).


D. E. Roberts, A. du Plessis, J. Steyn, L. R. Botha, C. A.  Strydom, I. J. van Rooyen, “Femto-second Laser Induced Breakdown Spectroscopy of silver with surrogate high temperature gas reactor fuel kernels”, Spectrochimica Acta Part B 65 (2010) 918-926.


Haiming Wen, Isabella J van Rooyen, John D Hunn, Tyler J Gerczak;  “Electron Microscopy Study of Pd, Ag, and Cs in Carbon Areas in the Locally Corroded SiC Layer in a Neutron-Irradiated TRISO Fuel Particle”, In Press, Journal of the European Ceramic Society, On line May 7, 2018 https://doi.org/10.1016/j.jeurceramsoc.2018.05.003.

 

Internationally Peer Reviewed Journal Publications

October 2017- September 2018
Haiming Wen, Isabella J van Rooyen, John D Hunn, Tyler J Gerczak;  “Electron Microscopy Study of Pd, Ag, and Cs in Carbon Areas in the Locally Corroded SiC Layer in a Neutron-Irradiated TRISO Fuel Particle”, In Press, Journal of the European Ceramic Society, On line May 7, 2018 https://doi.org/10.1016/j.jeurceramsoc.2018.05.003.


Meher, S., I.J. van Rooyen, T.M. Lillo, A Novel Dual-Step Nucleation Pathway in Crystalline Solids under Neutron Irradiation, Scientific Reports (2018) 8:98 | DOI:10.1038/s41598-017-18548-8.


T. M. Lillo, I. J. van Rooyen, and J. A. Aguiar, Silicon carbide grain boundary distributions, irradiation conditions and silver retention in irradiated AGR-1 TRISO fuel particles, https://doi.org/10.1016/j.nucengdes.2017.11.048, Nuclear Engineering and Design, Volume 329, 1 April 2018, Pages 46-52.


Rosales, Jhonathan, Isabella J van Rooyen, Rita Hoggan, Jason Harp, Clemente Parga, Effect of Si-content on U3Si2 fuel microstructure, https://doi.org/10.1007/s11837-017-2654-6, JOM 70 (2), 209-213.


October 2016- September 2017
Wen, H. and I.J. van Rooyen, "Distribution of fission products palladium, silver, cerium and cesium in the un-corroded areas of the locally corroded SiC layer of a neutron irradiated TRISO fuel particle" http://dx.doi.org/10.1016/j.jeurceramsoc.2017.04.012, Journal of the European Ceramic Society, Volume 37, Issue 10, August 2017, Pages 3271-3284.


Parga, C.J., I.J. van Rooyen*, B.D. Coryell, W.R. Lloyd, L.N. Valenti, H. Usman, Room Temperature Mechanical Properties of Electron Beam Welded Zircaloy-4 Sheet, Journal of Materials Processing Technology 241 (2017) 73–85 (*corresponding author).


Dunzik-Gougar, M. L., I. J. van Rooyen, C. M. Hill, T. Trowbridge, J. Madden, J. Burns, “Effect of Sample Preparation Techniques on Grain Boundary Characterization of Annealed TRISO-Coated Particles”, Nuclear Technology 196 (1), 111-120, October 2016
October 2015- September 2016.


Lillo, T.M., I.J. van Rooyen, Y.Q Wu, “Precession electron diffraction for SiC grain boundary characterization in unirradiated TRISO Fuel”, Nuclear Engineering and Design, http://dx.doi.org/10.1016/j.nucengdes.2016.05.027, Volume 305, 15 August 2016, Pages 277–283.


Leng, Bin, Isabella van Rooyen*, Yaqiao Wu, Izabela Szlufarska, Kumar Sridharan, “STEM/EDS Analysis of Fission Products in Irradiated TRISO Coated Particles of the AGR-1 Experiment”,Journal of Nuclear Materials, 475 (2016) 62-70(* corresponding author).


Wen, Haiming, Isabella J. van Rooyen*, John D. Hunn, Tyler J. Gerczak,  “Advanced electron microscopy study of Pd, Ag and Cs in carbon areas in the locally corroded SiC layer in a neutron irradiated TRISO fuel particle”,  submitted to Journal of Nuclear Materials, April 2016, revision in progress (*corresponding author).


Dunzik-Gougar, Mary Lou, Isabella J. van Rooyen, Philip M. van Rooyen, Connie M. Hill, “Effect of CVD Production Parameters and Annealing on the Grain Characteristics of a Thin Silicon Carbide Layer”, submitted to Journal of Nuclear Materials, September 2015, revision in progress.


Van Rooyen,I. J.,E. J. Olivier and J. H Neethling, “Investigation of the Fission Products Silver, Palladium and Cadmium in Neutron Irradiated SiC using a Cs Corrected HRTEM“, Journal of Nuclear Materials, 476 (2016) 93 - 101.


Kane, J. J., I. J. van Rooyen, A. E Craft, T. J. Roney, S.R. Morrell, “Evaluating Quantitative 3 D Image Analysis as a Design Tool for Low Enriched Uranium Fuel Compacts for the Transient Reactor Test Facility: A preliminary study”, Nuclear Engineering and Design, 300 (2016) 1-11.


Lillo, T. M.  and I. J. van Rooyen, Influence of SiC Grain Boundary Character on Fission Product Transport in Irradiated TRISO Fuel, Journal of Nuclear Materials, 473 (2016) 83-92.


Engelbrecht, J.A.A., G Deysel, EG Minnaar, WE Goosen, I.J. van Rooyen, “Assesment of neutron irradiated 3C-SiC implanted at 800C”, Journal of Applied Optics, Vol.36, No 6, P937 – 941, Nov 2015.


Paul A. Demkowicz, John D. Hunn, Robert N. Morris, Charles A. Baldwin, Jason M. Harp, Philip L. Winston, Scott A. Ploger, Tyler Gerczak, Isabella J. van Rooyen, Fred C.  Montgomery, Chinthaka M. Silva, “Irradiation performance of AGR-1 high temperature reactor fuel,” Nuclear Engineering and Design, http://dx.doi.org/10.1016/j.nucengdes.2015.09.011, October 2015.


Haiming Wen, Yaojun Lin, David N. Seidman, Julie M. Schoenung, Isabella J. van Rooyen and Enrique J. Laverni, “An Efficient and Cost-Effective Method for Preparing Transmission Electron Microscopy Samples from Powders”, Microscopy and Microanalysis / Volume 21 / Issue 05 / October 2015, pp 1184-1194
October 2014 to September 2015.


Wen, Haiming, Isabella J. Van Rooyen*, John D. Hunn, Tyler J. Gerczak, Charles A. Baldwin, and Fred C. Montgomery, 2015a, “Advanced electron microscopy study of fission product distribution in the failed SiC layer of a neutron irradiated TRISO coated particle”, Proceedings of Microscopy and Microanalysis 2015, Portland, Oregon, August 2-7, 2015, M&M2015 (*corresponding author).


Wen, Haiming, Isabella J. Van Rooyen*, Connie Hill, Tammy Trowbridge, and Ben Coryell, “Fission product distribution in TRISO coated particles neutron irradiated to 3.22×1025 n/m2 fast fluence at 1092°C”, Proceedings of ASME Power and Energy 2015 conference, San Diego, California, June 28 – July 2, 2015 (*corresponding author).


Engelbrecht, J.A.A., I.J. van Rooyen, A. Henry and E. Janzén and B. Sephton, “Notes on the plasma resonance peak employed to determine doping in SiC”, Accepted by Infrared Physics & Technology 12 July 2015, INFPHY-D-15-00093R1.


Lillo, Thomas M., Isabella J. van Rooyen, Yaqiao Wu, 2015c, “Grain boundary character and fission product precipitation in SiC”, Proceedings 2015 ANS Annual Meeting, June 7-11, 2015, San Antonio, TX.


Lillo, Thomas M., and Isabella J. Van Rooyen, “Associations of Pd, U and Ag in the SiC layer of neutron irradiated TRISO fuel,” Journal of Nuclear Materials, Vol. 460 pp. 97 106, May 2015.


Wen, Haiming, Isabella J. van Rooyen*, John D. Hunn , Tyler J. Gerczak , Charles A. Baldwin , Fred C. Montgomery, “Advanced electron microscopy study of fission product distribution in the failed SiC layer of a neutron irradiated TRISO coated particle”, Paper No. 0374, Microsc. Microanal. 21 (Suppl3), 747-748, 2015, doi:10.1017/S1431927615004535, (*Corresponding author).

 
Van Rooyen, I. J., D. Janney, B. Miller, P. Demkowicz, J. Riesterer, “Electron microscopic evaluation and fission product identification in irradiated TRISO coated particles from the AGR-1 experiment: A preliminary review”, Nuclear Engineering and Design, 271 (2014) 114-122  (Also presented at the HTR2012 Tokyo 28 October-1 November 2012,paper HTR2012-3-023).


Van Rooyen, I. J., ML Dunzik-Gougar, PM van Rooyen, “Silver (Ag) transport mechanisms in SiC layer of TRISO coated particles: A critical review”, Article in Press: Nuclear Engineering and Design, Nuclear Eng and Design, Vol 271, May 2014, p. 180-188, (Also presented at the HTR2012 Tokyo 28 October-1 November 2012, Paper HTR-3-040,).


Van Rooyen, I. J.,Y. Q. Wu, and T. M. Lillo, “Identification of Silver and Palladium in Irradiated TRISO Coated Particles of the AGR1 Experiment,” Journal of Nuclear materials 446 (2014) 178-186.
Lillo, T.M., I.J. van Rooyen, Spatial Distribution of Pd, Ag & U in the SiC Layer of an Irradiated TRISO Fuel Particle, Microsc.Microanal. 20 (Suppl 3), 2014 p. 1810.


Engelbrecht, J. A. A. , E. Jansen, I. J. van Rooyen, “Impact of dielectric parameters on the reflectivity if 3C-SiC wafers with a rough surface morphology in the restrahlen region”, Physica B 439 (2014) 115-118.(Also presented at the South African Institute of Physics (SAIP), Kariega, 2013.).


Engelbrecht, J. A. A.,  G. Deyzel, E. Minnaar, W. E. Goosen, I. J. van Rooyen, “The influence of neutron-irradiation at low temperatures on the dielectrical parameters of 3C-SiC”, Physica B 439 (2014) 169-172.
Prior to October 2014.


Van Rooyen, I. J., P.M. van Rooyen and M.L. Dunzik-Gougar. The Effect of High Temperature Annealing on the Grain Characteristics of a Thin Chemical Vapor Deposition Silicon Carbide Layer. Microscopy and Microanalysis, 19 (Suppl. 2), pp 1948-1949, doi:10.1017/S1431927613011732, published online: 09 October 2013 (also presented at the Microscopy & Microanalysis Conference, Indianapolis, August 4-8, 2013).


Bragg-Sitton, Shannon, Kristine Barrett, Isabella van Rooyen, David Hurley, Marat Khafizov, “Studying silicon carbide for nuclear fuel cladding”, Nuclear Engineering International, 53, 706, 37-40, May 2013.


Van Rooyen, I. J., J. J. A. Engelbrecht, A. Henry, E. Janzén, J. H. Neethling, P. M. van Rooyen  “The Influence of grain size and phosphorous-doping of polycrystalline 3C-SiC on Infrared Reflectance Spectra”, Journal of Nuclear Materials, 422 (1-3) ( 2012) 103-108.

 
Van Rooyen, I. J., C. A. Smal,  J. Steyn, H. Greyling, “Applications of Nd:YAG laser micromanufacturing in High Temperature Gas Reactor research.”, Journal of Nuclear Materials, 427 (2012) 169-173.


Van Rooyen, I. J., J. H. Neethling, A. Henry, E. Janzen, S. M. Mokoduwe, A. Janse van Vuuren, E. Olivier, “Effects of Phosphorous-doping and High Temperature Annealing on CVD grown 3C SiC”, Nuclear Engineering and Design 251 (2012) 191-202.


Engelbrecht, J. A. A., I. J. van Rooyen, A. Henry, E. Janzén and E. J. Olvier; “The origin of a peak in the reststrahlen region of SiC”; Physica B: Condensed Matter, 407 (2012) 1525-1528.


Barrett, K.E., M. P. Teague, I. J. van Rooyen, S. M. Bragg-Sitton, K. D. Ellis, C. R. Glass, G. A. Roth, K. M. McHugh, J. E. Gamier, G. W. Griffith, M. C. Teague, G. L. Bell, L. L.  Snead, Y. Katoh, “Engineering Challenges of LWR Advanced Fuel Cladding Technology in Preparation for In-Reactor Demonstrations”, Transactions of the American Nuclear Society, 107, 886, November 2012 (Also presented at the ANS winter meeting 2012).


Engelbrecht,J. A. A., E. Janzén,  A. Henry and I. J. van Rooyen, “The impact of various dielectric parameters on the additional peak in the restrahlen region of SiC”  Submitted to Physica B: Condensed Matters, 16 March 2011.


Van Rooyen, I. J., E. Nquma, J. Mahlangu and J. H. Neethling, “Nano indentation hardness measurements as a characterization technique of SiC- and pyrolitic carbon layers of experimental PBMR coated particles.” Mechanical properties and Performance of Engineering Ceramics and Composites V: Ceramic Engineering and Science Proceedings , Volume 31, Issue 2 (2010) 69-78 (ISBN:978-0-470-59467-4) (Also presented at the conference ICACC2010, January 2010, Daytona Beach, USA).


Van Rooyen, I. J., J. H. Neethling and P. M. van Rooyen; “The influence of temperature on the strength of TRISO coated particles” Journal of Nuclear Materials, 402 (2010) 136-146.


Roberts,D. E., A. du Plessis, J. Steyn, L. R. Botha, C. A.  Strydom, I. J. van Rooyen, “Femto-second Laser Induced Breakdown Spectroscopy of silver with surrogate high temperature gas reactor fuel kernels”, SpectrochimicaActa Part B 65 (2010) 918-926.


International Conference Papers

I.J. van Rooyen, T.M. Lillo, H. Wen, C. M. Hill, T.Holesinger, Y.Q. Wu and J.A. Aguiar, "Micro-Nano-structural examination and fission product identification in neutron irradiated AGR-1 TRISO fuel particles using advanced micro-analytical and electron microscopic techniques". Proceedings of HTR2016, Las Vegas, November 2016.


T.M. Lillo, I.J. van Rooyen and J.A. Aguiar, "SiC grain boundary distributions, irradiation conditions and Ag retention in irradiated AGR-1 TRISO fuel particles", Proceedings ofHTR2016, Las Vegas, November 2016
K. Wright and I.J. van Rooyen, "EPMA of irradiated AGR1 TRISO fuel particles", Proceedings of HTR2016, Las Vegas, November 2016.


C. J. Parga; I. J. van Rooyen; M. V. Glazoff; E. P. Luther, "TREAT Reactor LEU Fuel-Clad Chemical Interaction Empirical-Modeling Analysis", Proceedings of TopFuel 2016, September 11-16, 2016, Boise, USA.


Erik Luther, Isabella van Rooyen, Rafael Leckie, Pallas Papin, Andrew Nelson and James Hunter, “Pre-conceptual Development and Characterization of an Extruded Graphite Composite Fuel for the TREAT Reactor”, Proceedings of TMS2015 144th Annual meeting, March 15-19, 2015; Walt Disney World Orlando, Florida, USA .


I. J. van Rooyen, E. J. Olivier and J. H Neethling, “Investigation of the Fission Products Silver, Palladium and Cadmium in Neutron Irradiated SiC using a Cs Corrected HRTEM“, HTR2014-3-1255, Proceedings of the 7th International Topical Meeting on High Temperature Reactor Technology (HTR2014), China, October 27-31, 2014.


I. J. van Rooyen, H. Nabielek, J. H Neethling, M. J. Kania, and D. A. Petti, “Progress in solving the elusive Ag transport mechanism in TRISO coated particles: What’s new?“, HTR2014-3-1261, Proceedings of the 7th International Topical Meeting on High Temperature Reactor Technology (HTR2014), Weiha, China, October 27-31, 2014.


Demkowicz, P.A., J.D. Hunn, R.N. Morris, C.A. Baldwin, J.M. Harp, P.L. Winston, S.A. Ploger, T.J. Gerczak, I.J. van Rooyen, F.C. Montgomery, and C.M. Silva, “Irradiation performance of AGR-1 high temperature reactor fuel”, Paper HTR2014-31182, Proceedings of the 7th International Topical Meeting on High Temperature Reactor Technology (HTR2014), Weihai, China, October 27–31, 2014..


T. M Lillo, I. J. van Rooyen, “Spatial Distribution of Pd, Ag and U in the SiC layer of an Irradiated TRISO fuel particle”, Microscopy & Microanalysis 2014 Meeting, Aug. 3-7, 2014, Hartford, CT, USA.


I. J. van Rooyen, Y. Q. Wu, T. M. Lillo, T. L. Trowbridge, J. M. Madden and D. Goran, “Advanced electron microscopic techniques applied to the characterization of irradiation effects and fission product identification of irradiated TRISO coated particles from the AGR-1 experiment,” Global 2013 Conference proceedings, Salt Lake City, 29 September 2013.


I. J. van Rooyen, M. L. Dunzik-Gougar, P. M. van Rooyen, “Silver (Ag) transport mechanisms in SiC layer of TRISO coated particles: A critical review”, Paper HTR-3-040, Proceedings of the HTR2012, Tokyo 28 October-1 November 2012.


I. J. van Rooyen, D. Janney, B. Miller, P. Demkowicz, J. Riesterer, “Electron microscopic evaluation and fission product identification in irradiated TRISO coated particles from the AGR-1 experiment: A preliminary review”, Paper HTR2012-3-023, Proceedings of the HTR2012, Tokyo 28 October-1 November 2012.


I. J. van Rooyen, M. L. Dunzik-Gougar, P. M. van Rooyen, “Silver (Ag) transport mechanisms in SiC layer of TRISO coated particles: A critical review”, Paper HTR-3-040, Proceedings of the 6th International Topical Meeting on High Temperature Reactor Technology, HTR2012 Tokyo 28 October-1 November 2012.


I. J. van Rooyen, M. L. Dunzik-Gougar, P. M. van Rooyen, T. Trowbridge, “On Techniques to Characterize and Correlate Grain Size, Grain Boundary Orientation and the Strength of the SiC Layer of TRISO Coated Particles: A Preliminary Study”, Paper HTR-3-024, Proceedings of the 6th International Topical Meeting on High Temperature Reactor Technology, HTR2012 Tokyo 28 October-1 November 2012.


I. J van Rooyen, J. H. Neethling, A. Henry, E Janzén , “Influence of phosphorous and high temperature on the nanostructures of 3C-SiC”, (HTR2010, Prague, October 2010).


S.M.Mokoduwe, I. J. van Rooyen, J. H. Neethling, A. Janse van Vuuren, “The effect of high temperature annealing on the grain size of CVD-grown SiC and PBMR experimental TRISO- Coated Particles” (HTR2010, Prague, October 2010).


J. A. A. Engelbrecht, I. J. van Rooyen, J. Olivier,  E. Janzén and A. Henry, “Characterization of SiC films by AFM, optical microscopy and infrared spectroscopy”, (Microscopy Society of South Africa (MSSA), Limpopo, South Africa,  October 2010).


D.E. Roberts, A. du Plessis, L.R. Botha, J.  Steyn, C.A.Strydom and I.J.van Rooyen, “Femtosecond Laser Induced Breakdown Spectroscopy applied to depth profiling of 500-micron ZrO2 spheres”, South African Institute of Physics (SAIP), Pretoria, 27 September – 1 October 2010.


J.A.A. Engelbrecht, I. J. van Rooyen, EJ Olivier, E Janzén and A Henry, “Characterization of SiC films by AFM and Infrared Spectroscopy”, ProcMicroscSoc South Afr 40 (2010) 41.


Isabel J. van Rooyen and Jan H Neethling, “The influence of the SiC-PyC interlayer properties on the strength of TRISO coated particles after high temperature annealing”. Microscopy Society of South Africa (MSSA), Durban, South Africa, December 2009.


I. J. van Rooyen, J. H. Neethling and J. Mahlangu, “Influence of Temperature on the Micro- and Nanostructures of Experimental PBMR TRISO coated particles: A Comparative Study”, 4th International Topical Meeting on High Temperature Reactor Technology, Washington DC USA, 28 Sept 2008, Washington DC USA, HTR 2008-58189 (2008).


I. J. van Rooyen, J. H. Neethling and J. Mahlangu, “Influence of Temperature on the Micro- and Nanostructures of Experimental PBMR TRISO coated particles: A Comparative Study”, Proceedings of the 4th International Topical Meeting on High Temperature Reactor Technology, 28 Sept 2008 Washington DC USA, HTR 2008-58189 (2008) .


Idaho National Laboratory Reports/External

Newsletters (2011-current)
I.J. van Rooyen, High Resolution Transmission Electron Microscopy at LANL, SOW-11969, rev 2, January 2017
I.J. van Rooyen, Effects of Neutron Irradiation on the Micro/Nano Scale Structure and Fission Product Distribution of TRISO coated particle fuel kernels from AGR Experiments, University of Florida, SOW-13818, rev 0, March 2017.


I. J. van Rooyen, T. M. Lillo, H. Wen, K.E. Wright, J. Madden, and J. Aguiar, Advanced Electron Microscopy and Micro-Analytical Technique Development and Application on Irradiated TRISO-Coated Particles from the AGR-1 Experiment, INL/EXT-15-36281, January 2017.


T.M. Lillo, I.J. van Rooyen, H. Wen, J.A. Aguiar, Supplemental PED Advanced Microscopy Data From Microstructural Analyses of AGR-1 TRISO Particles”, INL/LTD-16-39740, December 2016.


I. J. van Rooyen and T. M. Lillo “SiC Grain Boundary Character and Fission Product Transport in irradiated TRISO coated particles”, INL Nuclear Fuels and Materials Spotlight volume 5 publication, October 2016.

 
Glazoff, Michael, Isabella van Rooyen, Ben Coryell, and Clemente Parga, INL/EXT-16-37972, Rev. 0, “Selection of Nuclear Fuel for TREAT: UO2 vs U3O8.” June 2016.


Parga, Clemente, Isabella J. van Rooyen, Ben Coryell, W. R. Lloyd, Lou Valenti, and H. Usman, INL/INT-16-37741, Rev. 0, “Preliminary Room Temperature Mechanical Properties of Electron Beam Welded Zircaloy-4 1.6mm-Sheet Test Samples,” Feb. 2016.


Youngblood, Robert, Isabella J. van Rooyen, Ben Coryell, Rebecca E. Smith, John Bess, and Kirt Jamison, INL/MIS-16-37924, Rev. 0, “Initial Conceptual HAZOP of TREAT Fuel Element Assemblies.” June 2016.


Demkowicz, Paul A., Jason M. Harp, Philip L. Winston, Scott A.Ploger, Isabella J. van Rooyen, "AGR-1 Compact 4-1-1 Post Irradiation Examination results", INL/EXT-15-36169.


van Rooyen, Isabella, Dawn Scates,  Rebecca Smith, Kirt Jamison, Erik Luther, Anthony Crawford, Tedd Lister, and Howard Hartman, PLN-4807, "TREAT Qualification Plan" updated in FY2015,  issued Oct, 9th 2015.


Valenti, Lou, and Isabella J. van Rooyen, INL/INT-15-37489, Rev. 0, “History of Acquisition of Zircaloy III and Zircaloy IV for TREAT LEU Fuel.” .


Jamison, Kirt, Sean Morrell, Isabella J. van Rooyen, Art Wright, and Erik Luther, INL/EXT-15-37074, “TREAT Low Enriched Uranium Fuel Design Analysis Guide,” Dec. 2015.


Demkowicz, Paul A., John D. Hunn, Robert N. Morris, Isabella van Rooyen, Tyler Gerczak, Jason M. Harp, Scott A. Ploger, “ AGR-1 Post Irradiation, Examination Final Report”, INL/EXT-15-36407, September 2015.


Isabella J. van Rooyen, Erik Luther, Nick Woolstenhulme, Kirt Jamison, and Lou Valenti, INL/LTD-14-31704, Rev. 1, “TREAT Conversion LEU Fuel Design Trade Study. November 2015”.


Isabella J van Rooyen, Amber Miller, Kevin McHugh, “Development of a thermal stress HWCF test using hybrid SiC-CMC mock-up test samples”, INL/MIS-13-TBD, September 2013.


I. J. van Rooyen, T. M. Lillo, Y.Q. Wu, “First-of-a-kind advanced electron microscopy characterization applied to identify silver- and palladium-containing fission products in irradiated TRISO coated particles of the AGR-1 experiment”, INL Nuclear Fuels and Materials Spotlight volume 4 publication, July 2013 .


Shannon Bragg-Sitton, David Hurley, Marat Khafizov, Kevin McHugh, Brad Merrill, Isabella van Rooyen, Robert Schley, Yutai Katoh, Chunghao Shih, “Advanced Fuels Campaign: Silicon Carbide Gap Analysis and Feasibility Study”, INL/EXT-13-29728, 30 July 2013.


Isabella J van Rooyen, “Identification of Silver in Irradiated TRISO Coated Particles of the AGR-1 Experiment Using Advanced Electron Microscopic Techniques”, Presentation at the INL Nuclear Science and Technology Peer Review, 3 June 2013.


Isabella J van Rooyen, Kevin McHugh, Amber Miller, “Comparison between the HWCF system and ATR operability Report”, INL/MIS-13-29312, May 2013.


Isabella J van Rooyen, “EBSD Characterization of Tubular Cladding Plasticity after Bend Testing: A Feasibility study”, INL/EXT-13-28519, March 2013.


Isabella J. van Rooyen, “Selected Pre-Irradiation Testing to Support the LWRS Program’s Hybrid SiC CMC Zircaloy-4 Unfueled Rodlet Irradiation”, Advanced Light Water Reactor Nuclear Fuels Pathway, LWRS Newsletter, Issue 10, January 2013.


Isabella J. van Rooyen, Brandon Miller Dawn Janney, Jessica Riesterer Paul Demkowicz Jason Harp Scott A Ploger, “Electron Microscopic Examination of Irradiated TRISO Coated Particles of Compact 6-3-2 of AGR-1 Experiment”, INL/EXT-11-23911 , December 2012.


Isabella J. van Rooyen, “Pre-Irradiation Testing and Analysis to Support the LWRS Hybrid SiC-CMC-Zircaloy-4 Unfueled Rodlet Irradiation”, INL/EXT-12-27189, September 2012.


Isabella J. van Rooyen, “Characterization of LWRS Hybrid SiC-CMC-Zircaloy-4 Fuel Cladding after Gamma Irradiation”, INL/EXT-12-27188, September 2012.


Isabella J. van Rooyen, Shannon M. Bragg-Sitton, “Development and Characterization of Advanced Nuclear Fuel Cladding”, Advanced Light Water Reactor Nuclear Fuels Pathway, LWRS Newsletter, Issue 7, March 2012.

Presentations:

International conference presentations

Isabella van Rooyen, Yong Yang, and Matthew Cook, “The Microstructure and Fission Product Behavior in Irradiated AGR TRISO Fuel Kernels”, TMS2018 conference, March 11-15, 2018, Phoenix, Arizona, USA.


Isabella J. van Rooyen (Invited), Tom M. Lillo, Karen Wright, Jeffery A. Aguiar and Terry Holesinger , Neutron irradiated SiC Advanced Analyses to understand Fission product Transport: Safety tested TRISO coated particle, TMS2017 conference, San Diego, CA, Feb 26 – March 2, 2017


Jeffery A. Aguiar, Isabella J. van Rooyen, Fission Product Electron Microscopy Analysis of Post Irradiated TRISO-coated Particles from the Second Advanced Gas Reactor Experiment, TMS2017 conference, San Diego, CA, Feb 26 – March 2, 2017.


Terry G. Holesinger, Isabella J. van Rooyen and Weicheng Zhong, Post irradiation HRTEM examination of UCO Fuel Kernels from TRISO coated particles, TMS2017 conference, San Diego, CA, Feb 26 – March 2, 2017.


Y. Q. Wu, I. J. van Rooyen, J. Burns, J. W. Madden and H. M. Wen, Identification of Ag-phase in TRISO fuels by Atom Probe Tomography, Materials Science & Technology 2016, October 23-27, 2016;Salt Lake City, UT, USA.


Haiming Wen, Isabella J. van Rooyen, Correlation of fission product transport to grain boundary character in neutron irradiated tristructural isotropic coated nuclear fuel particles, TMS2016, 145th Annual Meeting & Exhibition, February 14-18, 2016; Nashville Tennessee, USA.


Isabella van Rooyen, Terry Holesinger, Haiming Wen, High resolution electron microscopy examination of fission product precipitates in TRISO coated particles, TMS2016, 145th Annual Meeting & Exhibition, February 14-18, 2016; Nashville Tennesse, USA.


Isabella van Rooyen, Darryl Butt, Randy Lloyd, Jordan Vandegrift, Patrick Price, Down selection of Clad Material for LEU Fuel Elements for the TREAT Reactor, TMS2016, 145th Annual Meeting & Exhibition, February 14-18, 2016; Nashville Tennesse, USA.


Erik Luther, Isabella van Rooyen, Lou Valenti, Matt Dvornak, Anthony Crawford, Ben Coryell, Fabrication of Mock Up LEU Fuel Elements for the TREAT Reactor, TMS2016, 145th Annual Meeting & Exhibition, February 14-18, 2016; Nashville Tennesse, USA.


Y. Q. Wu, I. J. van Rooyen, H. M. Wen, J. Burns and J. W. Madden, Microstructure Characterization of TRISO fuels by Atom Probe Tomography, TMS2016, 145th Annual Meeting & Exhibition, February 14-18, 2016; Nashville Tennesse, USA.


Terry Holesinger, Erik Luther, Isabella van Rooyen, Pallas Papin, Amber Telles, Scott Niedzialek, Alvin Short and Clay Richardson, Microstructural Investigation of TREAT Graphite fuel blocks, TMS2016, 145th Annual Meeting & Exhibition, February 14-18, 2016; Nashville Tennesse, USA.


I. J. van Rooyen, C. Hill, and T. Trowbridge. “Fission product distribution patterns as a comparative characterization tool for TRISO fuel performance”, TMS2015 144th Annual meeting, March 15-19, 2015; Walt Disney World Orlando, Florida, USA, An abstract was submitted and accepted for oral presentation.


I. J. van Rooyen, K. Jamison, E. Luther, D.D. Papadias, S.R Morrell, A. E. Wright and H.T III Hartman,  “Engineering challenges in the down selection of the TREAT pre-conceptual low-enriched fuel system concepts and design”, TMS2015 144th Annual meeting, March 15-19, 2015; Walt Disney World Orlando, Florida, USA, An abstract was submitted and accepted for oral presentation.


Erik Luther, Isabella van Rooyen, Rafael Leckie, Pallas Papin, Andrew Nelson and James Hunter, “Pre-conceptual Development and Characterization of an Extruded Graphite Composite Fuel for the TREAT Reactor”, TMS2015 144th Annual meeting, March 15-19, 2015; Walt Disney World Orlando, Florida, USA.


I.J. van Rooyen, S.R. Morrell, R.K. Jamison, A.L Crawford and H.T. Hartman III, “Performance and Fabrication Status of TREAT LEU Conversion Conceptual Design Concepts”, RERTR 2014 – 35TH International Meeting on Reduced Enrichment for Research and Test Reactors, October 12-16, 2014, IAEA Vienna International Center, Vienna, Austria.


INVITED, IJ van Rooyen, YQ Wu, TM Lillo, J Youngsman and JH Neethling, “Approach and Micro-analysis technicques applied to study fission product transport mechanisms in neutron irradiated SiC layers”, XXIII IMRC, Cancun, Mexico, August 17-22, 2014.


Isabella van Rooyen, Mary Lou Dunzik Gougar, Philip van Rooyen, “Effect of Grain Characteristics on Mechanical properties of thin CVD SiC layers: A preliminary study”, XXIII IMRC, Cancun, Mexico, August 17-22, 2014.


Isabella J van Rooyen, “Advanced Microscopy and Micro-analysis Results Summary, AGR Fuels program review”, July 30, 2014, Idaho Falls, USA.


Isabella van Rooyen, Bin Leng, Yaqiao Wu, Tom Lillo, Izabela Szlufarska, Kumar Sridharan, Tyler Gerczak, Jim Madden, “Products in irradiated SiC using Scanning Transmission Electron Microscopy  and Atom Probe Tomography RTE 13-412”, ATR NSUF User’s week 2014, Idaho Falls, June 4-6, 2014.


Yaqiao (Y. Q.) Wu, I. J. van Rooyen, T. M. Lillo and J. W. Madden, “Advances in Structural and Chemical Imaging”, ASCI 2014 Conference, Seattle, WA, May 28th, 2014
I. J. van Rooyen, T. M. Lillo and Y.Q. Wu, “Advanced Electron Microscopic Examination for the Identification of Silver and Palladium in Irradiated SiC”. TMS 2014 conference, San Diego, February 2014.


Isabella van Rooyen, Mary Lou Dunzik Gougar, Philip van Rooyen, “The Application of EBSD measurements to determine the effect of Grain Characteristics on Mechanical Properties on thin CVD SiC Layers”, ATR NSUF User’s week 2013, Idaho Falls, June 10-14, 2013.


John E Garnier, Michael V Glazoff, Sergey Rashkeev, Isabella J Van Rooyen, George W Griffith, “Advanced Cladding Inspection Using Innovative Optical Morphological Analysis”, (ICACC, S13, 007, 2013) , February 2013, Daytona Beach, Florida, USA.


KE Barrett, MP Teague, IJ van Rooyen, S Bragg-Sitton, K Ellis, C Glass, G Roth, K McHugh, J Garnier, G Griffith, M C Teague, L Snead, Y Katoh, G Bell, “Engineering Challenges of LWR Advanced Fuel Cladding Technology in Preparation for In-Reactor Demonstrations”, ANS winter meeting, November 2012.


IJ van Rooyen, TL Trowbridge, T Lillo, “EBSD applications to predict nuclear fuel performance”,EBSD2012 conference, Pittsburgh, June 19-21, 2012.


Paul Demkowicz, Scott Ploger, Isabella van Rooyen, Jessica Riesterer, “Microanalysis of irradiated coated particle fuel from the AGR-1 irradiation experiment”, TMS 2012, March 2012.


Isabel J van Rooyen, “Nano technology in PBMR “ Nano Africa, Cape Town South Africa, December 2006
Isabel J van Rooyen, “Towards a Powder Metallurgy Strategy for South Africa” during the Powder Forming Technologies workshop of PMASA in September 2005 in Johannesburg.


Isabel J van Rooyen, “An Introduction to Powder Metallurgy Design” during the RAPDASA international conference in October 2005 in Pretoria.


Conference poster presentations

Robert Steele, Mary Lou Dunzik-Gougar and Isabella van Rooyen, Identification and Quantification of Carbon Phases in Conversion Fuel for the Transient Reactor Test Facility, Nuclear Fuels and Structural Materials (NFSM-2016) (embedded ANS Topical Meeting), June 12–16, 2016 • New Orleans.

 
Robert Steele, Angelica Mata, Mary Lou Dunzik-Gougar and Isabella van Rooyen, Identification And Quantification Of Graphitic And Non-Graphitic Carbon Phases In Low Enriched Uranium Conversion Fuel For The Transient Reactor Test Facility At The INL, CARBON 2016, the World Conference on Carbon to be held at the Penn State Conference Center Hotel, in State College, Pennsylvania (July 10-15, 2016).


Jordan L. Vandegrift, Kelci Lester, Sirak Mekonen, Patrick M. Price, Darryl P. Butt, Isabella J. Van Rooyen, High Temperature Behavior of Zirconium Alloys, MS&T, October 23-27, 2016, Salt Lake City.


Sirak M. Mekonen, Patrick M. Price, Isabella van Rooyen, Darryl P. Butt, High Temperature Investigation of Zirconium Alloys in Air, MS&T, October 23-27, 2016, Salt Lake City.


J. A. A. Engelbrecht, G. Deyzel, E. Minnaar, W. E. Goosen, I. J. van Rooyen, “The influence of neutron-irradiation at low temperatures on the dielectrical parameters of 3C-SiC”, South African Institute of Physics (SAIP), Kariega 2013.


IJ van Rooyen, G Griffith, J Garnier, “Testing Systems and Results for Advance Nuclear Fuel Materials”, 3rd International Conference on NPP Life Management (PLIM) for Long Term Operations (LTO), 14-18 May 2012, Salt Lake City, UT, USA .


I.J. van Rooyen , S. M. Mokoduwe and J. H. Neethling, “The effect of high temperature annealing on the grain size of CVD-grown SiC” Microscopy Society of South Africa (MSSA), Durban, South Africa,  December 2009
International workshop presentations.


I. J. van Rooyen, T. M. Lillo, Y. Q. Wu, T. Trowbridge, H. Wen and C. Hill, “Development and Application of Advanced Characterization Techniques to understand Irradiated TRISO Fuel Behavior”, The 3rd Workshop on HTGR SiC Material Properties, Sept. 30–Oct. 1, 2014, Jeju Island, South Korea.


I. J. van Rooyen, J. Youngsman, T. M. Lillo,  Y. Q. Wu, D. Goran, M. E. Lee, W. E. Goosen, J. H. Neethling, T. L. Trowbridge and J. W. Madden, “Methods for identification of crystallographic parameters of irradiated SiC to understand fission product transport”, The 3rd Workshop on HTGR SiC Material Properties, Sept. 30–Oct. 1, 2014, Jeju Island, South Korea.


Isabel J van Rooyen,  “Preliminary findings: Relationship between Grain size, grain boundary orientation and strength for the SiC layer of TRISO coated particles”, 2nd Workshop on “HTGR SiC Materials properties”, January 19-20, 2012, in conjunction with GIF VHTR Fuel/Fuel Cycle PMB meeting, Idaho Falls USA.


Isabel J van Rooyen, “The effect of irradiation and temperature on the Restrahlen shape of 3C-SiC reflectance infrared measurement: A preliminary study”, 2nd Workshop on “HTGR SiC Materials properties, January 19-20, 2012, in conjunction with GIF VHTR Fuel/Fuel Cycle PMB meeting, Idaho Falls USA.


Isabel J van Rooyen, Jessica Riesterer, Brandon Miller, Dawn Janney, Paul Demkowicz, “Preliminary findings: Microscopic examination and fission product precipitate identification in irradiated TRISO coated particles from the AGR-1 experiment”, 2nd Workshop on “HTGR SiC Materials properties, January 19-20, 2012, in conjunction with GIF VHTR Fuel/Fuel Cycle PMB meeting, Idaho Falls USA.


IJ van Rooyen, “Very high temperature properties of five experimental PBMR coated particle batches”, GenIV workshop Paris, September 2009.


IJ van Rooyen, “Possible Additional Characterization Techniques for Optimized SiC Layer Properties” GenIV workshop Paris, September 2009.


Ellen Nquma, Isabel J van Rooyen, “Nano-indentation hardness measurements as a characterization technique of SiC”, December 2008, Manchester University .


IJ van Rooyen, “PBMR CP Strength Method Development”, GenIV workshop , Paris, September 2009.


IJ van Rooyen and J.H. Neethling, “PBMR Fuel TRISO Coated Particles: A Preliminary Evaluation of Nanostructures”, IBSA workshop, Pretoria, South Africa, November 2007.


Isabel J van Rooyen and Jan H Neethling,  “Nano Characterization of the PBMR Fuel TRISO Coated Particles: A Preliminary HRTEM Evaluation”,  ICMR, Richards bay, South Africa, July 2007.


Invited international university lectures

Isabella van Rooyen, “Design and Performance Considerations in Nuclear Fuels and Materials: Research Case Studies”, Special seminar at University of Florida, March 28, 2018.


IJ van Rooyen, “Electron Microscopic Characterization of AGR-1 TRISO Coated Particles”, Nelson Mandela Metropolitan University, Physics department, 19 July 2013, Port Elizabeth, South Africa.


IJ van Rooyen, “PBMR New strength method development”, CRP6 strength workshop, Vienna, Austria,  December 2008.


IJ van Rooyen, “Ag transport mechanism the system engineering approach”, Missouri University, USA,  May 2008.

Research Interests:

​High Temperature Materials
Extreme Environment Materials
Nuclear Fuels
Composite Ceramic Materials
Additive Manufacturing
Advanced Manufacturing of Fuels and Structural Components
Corrosion

Version: 11.0
Created at 3/23/2018 9:59 AM by Phyllis L. King
Last modified at 6/12/2018 11:38 AM by Phyllis L. King