Sunil Sunny Chirayath

Short Bio:

Dr. Sunil Chirayath was the Director of NSSPI from June 2015 to November 30, 2023. He also served in NSSPI in various other capacities from August 2007 to May 2025. He served as a Professor in the Department of Nuclear Engineering at Texas A&M University and in various other academic capacities from January 2009 through January 2024. He has over 30 years of experience in nuclear science and engineering field and has worked in various capacities in academia and industry. Dr. Chirayath earned his M.S. and Ph.D. in Physics respectively at the University of Calicut (India) in 1994 and University of Madras (India) in 2005. Dr. Chirayath has advised 14 postdoctoral research associates, graduated nine Ph.D. and 37 M.S./M.E. students who went on to develop successful careers at the national laboratories, academia, and industry. He has over 240 technical publications in refereed journals (over 75) and national/international conference proceedings (over 160). Dr. Chirayath conducts research in the area of nuclear security and nonproliferation. He teaches courses on nuclear fuel cycle, nuclear material safeguards, nuclear security, and Monte Carlo radiation transport. His research interests include development of safeguards approaches for advanced reactors, proliferation resistance analysis of nuclear fuel cycle facilities, nuclear forensics, nuclear security insider threat analysis. Prior to joining NSSPI as a postdoctoral research associate in 2007, he held positions of Scientific Assistant (1991-1998) and Scientific Officer (1998-2009) in the Indian Atomic Energy Regulatory Board (AERB) with the responsibility for the regulatory review of Indian nuclear fuel cycle facilities. He was also a stipendiary radiation protection trainee for one year in the Indian Bhabha Atomic Research Center (BARC) during 1990-1991, prior to joining AERB. He was a member of the University Consortium for Monitoring, Technology and Verification funded by the US Department of Energy National Nuclear Security Administration (NNSA). He is a Senior Member of the Institute of Nuclear Materials Management (INMM) and was a Faculty Advisor of the Texas A&M student chapter of INMM. He is a member of the American Nuclear Society, Indian Association of Radiation Protection, Indian Society of Radiation Physics. He has held special appointments of Associate Professor at the Tokyo Institute of Technology (Japan), Adjunct Professor at the National Institute of Advanced Studies (India), and Honorary Professor at Amity University (India).

NSSPI Publications:

1. S. Choi and S. Chirayath, "Evaluating the proliferation resistance of plutonium in Light water reactor spent fuel from recycled reprocessed uranium", Annals of Nuclear Energy, 207 (2024).


2. D. Frank, M. Dzur, S. Chirayath, F. Naqvi, R. Weinmann-Smith, P. Simon, P. O'Neal, Q. Burke, "Localization and Quantification of Nuclear Material in Hot Laboratories: A Geometric Solution for NMC&A", Institute of Nuclear Materials Management Annual Meeting, 21-25 July 2024, Portland, Oregon.


3. P. Kim, H. Yasmine, M.S. Yim, and S.S. Chirayath, "Challenges in nuclear energy adoption: Why nuclear energy newcomer countries put nuclear power programs on hold?", Nuclear Engineering and Technology, 56,4 (2024).


4. P. Kim, S.S. Chirayath, "Assessing the nuclear weapons proliferation risks in nuclear energy newcomer countries: The case of small modular reactors", Nuclear Engineering and Technology, available online: 13 March 2024.


5. D. Mulyana, S.S. Chirayath, "A Gamma Spectroscopy-Based Non-Destructive Approach for Pebble Bed Reactor Safeguards", Annals of Nuclear Energy, 195 (2024).


6. M. Saito, and S.S. Chirayath, "Effects of multi-recycling of uranium reprocessed from spent nuclear fuel on the proliferation resistance of plutonium and uranium", Annals of Nuclear Energy, 195 (2024).


7. P. ONeal, S. Martinson, S.S. Chirayath, "Validation of a Machine-learning-based Nuclear Forensics Methodology for the Discrimination of a Chemically Separated Plutonium Sample from Low-enriched Uranium", Nuclear Science and Engineering, available online: 14 November 2023.


8. J.W. King, C.M. Marianno, S.S. Chirayath, "Neutron Measurements and Monte Carlo Simulations of Spent Nuclear Fuel in Dry Cask Storage Using a New Remote Monitoring System Prototype", Nuclear Science and Engineering, 197,12 (2023).


9. S. Chirayath, "Insider Threats and Strategies to Manage Insider Risk", Human Reliability Programs in Industries of National Importance for Safety and Security, Springer Nature, Singapore (2023).


10. S. Chirayath, H. Boo, S.M. Woo, "Investigations on the Pu to Cm-244 Ratio Method for Pu Accountancy in Pyroprocessing", Nuclear Engineering and Technology, 55,10 (2023).


11. K. Ragusa, S. Chirayath, "Insider Threat Case Studies from Industry", Human Reliability Programs in Industries of National Importance for Safety and Security, Springer Nature, Singapore (2023).


12. S. Chirayath, M. Sai Baba, Human Reliability Programs in Industries of National Importance for Safety and Security, Springer Nature, Singapore (2023).


13. S. Chirayath, O. Acuna, "Road to a Sustainable Human Reliability Program and Implementation Strategy", Human Reliability Programs in Industries of National Importance for Safety and Security, Springer Nature, Singapore (2023).


14. D. Mulyana, and S. Chirayath, "Proliferation resistance of light water reactor versus pebble bed reactor", Annals of Nuclear Energy, 188 (2023).


15. P. Kim, S. Chirayath, M. Fuhrmann, "Assessing Proliferation Risks in New Nuclear Energy Countries: The Case of Small Modular Reactors", INMM/ESARDA Joint Annual Meeting, 22-26 May 2023, Vienna, Austria.


16. S.N. Cerezo, S.S. Chirayath, G. Long, C. Keith, "Stochastic And Data Uncertainty Quantificaiton Of MCNP Predicted Nuclide Concentrations In Fuel Burnup Simulations", INMM/ESARDA Joint Annual Meeting, 22-26 May 2023, Vienna, Austria.


17. D. South, J. King, S.S. Chirayath, and C.M. Marianno, "Experimental and computational verification of a new remote monitoring system design for spent fuel dry cask safeguards", INMM/ESARDA Joint Annual Meeting, 22-26 May 2023, Vienna, Austria.


18. M. Ozkutuk S.S Chirayath, "Vulnerability Assessment of a Physical Protection System Design Using a Multi Path Analysis and Moving Critical Detection Points", INMM/ESARDA Joint Annual Meeting, 22-26 May 2023, Vienna, Austria.


19. K.H. Ragusa, S.S. Chirayath, C.M. Marianno, F. Naqvi, S. Hecker, D. Mulyana, "Roadmap for a Sustainable Professional Pipeline: The Nuclear Security Education Program at the Center for Nuclear Security Science and Policy Initiatives (NSSPI) at Texas A&M University", INMM/ESARDA Joint Annual Meeting, 22-26 May 2023, Vienna, Austria.


20. D. Lee S.S. Chirayath, "Feasibility Study of the Conversion of IRT-DPRK Research Reactor from HEU to LEU Fuel", INMM/ESARDA Joint Annual Meeting, 22-26 May 2023, Vienna, Austria.


21. S. Martinson, S. Chirayath, P. O'Neal, "Experimental Validation Of Nuclear Forensics Methodologies For Reactor-type Attribution, Burnup Determination, And Time Since Irradiation Estimation", INMM/ESARDA Joint Annual Meeting, 22-26 May 2023, Vienna, Austria.


22. P. O'Neal S.S. Chirayath, "Quantifying the Effect of Measurement Uncertainty on Separated Plutonium Attribution Methodology", INMM/ESARDA Joint Annual Meeting, 22-26 May 2023, Vienna, Austria.


23. M. Yildiz Sakarya and S.S. Chirayath, "Proliferation Resistance Analysis of Multiple Recycling of Re-enriched Reprocessed Uranium Fuel in Commercial Light Water Reactors", INMM/ESARDA Joint Annual Meeting, 22-26 May 2023, Vienna, Austria.


24. S. Martinson, J. Garcia, I. Haynes, S. Saini, E. Wagner, G. Long, C. III, S. Chirayath, "Nondestructive and destructive assay for forensics characterization of weapons-grade plutonium produced in LEU irradiated in a thermal neutron spectrum", Annals of Nuclear Energy, 183 (2023).


25. D. Mulyana and S.S. Chirayath, "Proliferation resistance assessment of a typical pebble bed reactor fuel", Annals of Nuclear Energy, 165 (2022).


26. J.W. King, D.M. South, S.S. Chirayath, C.M. Marianno, "Experimental and Computational Verification of a New Remote Monitoring System Design for Spent Fuel Dry Cask Safeguards using Small-scale, Generic Diversion Scenarios", Nuclear Technology, 208 (2022).


27. A. Sagadevan S.S. Chirayath, "Experimental Verification of Proposed Internal Remote Monitoring System for Spent Nuclear Fuel Dry Cask Storage Applications", Nuclear Technology, 208 (2022).


28. R.W. Gladen, T.J. Harvey, S.S. Chirayath, A.J. Fairchild, A.R. Koymen, A.H. Weiss, V.A. Chirayath, "Implementation of Machine Learning Technique for Estimating Gamma Direction Using a Coaxial High Purity Germanium Detector", Nuclear Instrumentation and Methods in Physics Research A, 1039, (2022).


29. P.J O'Neal, S.S. Chirayath, and Q. Cheng , "A Machine Learning Method for the Forensics Attribution of Separated Plutonium", Nuclear Science and Engineering, 196,7 (2022).


30. J.H. Moo, S.S. Chirayath, and S.G. Cho, "Physical Protection System Vulnerability Assessment of a Small Nuclear Research Reactor due to TNT-Shaped Charge Impact on its Reinforced Concrete Wall", Nuclear Engineering and Technology, 54,6 (2022).


31. D. Mulyana and S.S. Chirayath, "The Impact of Refueling Schemes on the Proliferation Resistance of a Pebble Bed Reactor", Annals of Nuclear Energy, 170 (2022).


32. E.D. Kitcher, J.M. Osbourn, S.S. Chirayath, "Characterization of Plutonium for Nuclear Forensics Using Machine Learning Techniques", Annals of Nuclear Energy, 170 (2022).


33. W.E. Ang, S. Prasad, and S.S. Chirayath, "Antineutrino detection for temporal monitoring of fuel burnup in a large nuclear reactor", Nuclear Instrumentation and Methods in Physics Research A, 1028 (2022).


34. A.A. Sagadevan S.S. Chirayath, "Design and Analysis of an Internal Remote Monitoring System for Spent Nuclear Fuel stored in a Dry Cask", Nuclear Technology, 208, 3 (2022).


35. M. Sai Baba I. Chowdhury, V. Nidhi, A.K. Shah, S.S. Chirayath, "A Review of Human Reliability Programs for Nuclear Security", Journal of Nuclear Materials Management, 49, 4 (2022).


36. R.M. Zedric, C.M. Marianno, S.S. Chirayath, Y. Diawara, and I. Darby , "The Effect of Irradiation Damage on the Charge Collection Efficiency of Silicon Avalanche Photodiodes", IEE Transactions on Nuclear Science, 69, 2 (2022).


37. S.P. Martinson and S.S. Chirayath, "Monte Carlo neutronics benchmarks on nuclear fuel depletion: A review", Annals of Nuclear Energy, 161 (2021).


38. P. O'Neal and S. Chirayath, "Attribution Of Separated Plutonium Using Machine Learning Techniques", INMM and ESARDA Joint Annual Meeting, Virtual Meeting, August 23 - September 1, 2021.


39. S. Choi S. Chirayath, "Investigation Of Proliferation Resistance Of Enriched Reprocessed Uranium Fuel Due To Higher Buildup Of Pu-238 At Discharge", INMM and ESARDA Joint Annual Meeting, Virtual Meeting, August 23 - September 1, 2021.


40. D. Mulyana S. Chirayath, "Fuel Pebbles Theft Analysis For Physical Protection System Development", INMM and ESARDA Joint Annual Meeting, Virtual Meeting, August 23 - September 1, 2021.


41. M. Saito, S.S. Chirayath, "Effects Of Reprocessed Uranium Multi-recycle On Proliferation Resistance Of Plutonium And Uranium", INMM and ESARDA Joint Annual Meeting, Virtual Meeting, August 23 - September 1, 2021.


42. S.S. Chirayath, C.M. Marianno, K.H. Ragusa, S.A. Dewji, S. Prasad, O.E. Acuna, "The Center For Nuclear Security Science And Policy Initiatives (NSSPI) At Texas A & M University: Fifteen Years Of Excellence In Education, Research, And Workforce Development", INMM and ESARDA Joint Annual Meeting, Virtual Meeting, August 23 - September 1, 2021.


43. S. Martinson, S. Chirayath, "Review Of Monte Carlo Neutronics Isotopic Validation Studies On Nuclear Fuel Depletion", INMM and ESARDA Joint Annual Meeting, Virtual Meeting, August 23 - September 1, 2021.


44. K. J. Glennon, E.M. Bond, T.A. Bredeweg, S.S. Chirayath, P.J. O'Neal, C.M. Folden III, "Nuclear forensics methodology identifies legacy plutonium from the Manhattan Project", Journal of Radioanalytical and Nuclear Chemistry, (2021).


45. S.S. Chirayath, C.A. Gariazzo, R. Righetti, and M. Naraghi, "A Novel Nuclear Material Control Technique for Pebble Bed Reactors", Transactions of American Nuclear Society, 125 (1), 758-761, December (2021).


46. R.M. Zedric, S.S. Chirayath, C.M. Marianno, Y. Diawara, N. Skukan, "Bias-dependent Displacement Damage Effects in a Silicon Avalanche Photodiode", Nuclear Instruments and Methods in Physics Research, Section B. 507 (2021).


47. A.A. Sagadevan S.S. Chirayath, "Design and Analysis of an Internal Remote Monitoring System for Spent Nuclear Fuel Stored in a Dry Cask", Nuclear Technology, available online (2021).


48. S.P. Martinson and S.S. Chirayath, "Review: Monte Carlo Neutronics Validation Studies of Burned Nuclear Material", Transactions of American Nuclear Society, 124, 580-583, June, (2021).


49. P.J. O. Neal, S.S. Chirayath, "Separated Plutonium Attribution using Machine Learning Techniques", Transactions of American Nuclear Society, 124, 428-431, June, (2021).


50. M. Sai Baba, S.S. Chirayath, "Summary of the Meetings on Human Reliability Program in Industries of National Importance Jointly Organized by NIAS, India and Texas A&M University, USA", Report NIAS/NSE/U/MR/02/2021


51. S.S Chirayath, C.R. Schafer, G.R. Long, "A new methodology to estimate stochastic uncertainty of MCNP-predicted isotope concentrations in nuclear fuel burnup simulations", Annals of Nuclear Energy, 151 (2021).


52. J.W. King, M.D. Shah, C.M. Marianno, S.P. Khatri, S.S. Chirayath, "Computational Evaluation of Novel Beta Radiation Probe using Integrated Circuits", SN Applied Sciences, 3, 386 (2021).


53. S.M. Woo, H. Kim, S.S. Chirayath, "Influence of the spatial Pu variation for evaluating the Pu content in spent nuclear fuel using Support Vector Regression", Annals of Nuclear Energy, 135 (2020).


54. Y. Minamigawa, E.D. Kitcher, S.S. Chirayath, "A Method to Estimate Fission Product Concentration Uncertainty in a Multi-Time-Step MCNP6 Code Nuclear Fuel Burnup Calculation", Nuclear Technology, 206, 1 (2020).


55. K.J. Glennon, E.M. Bond, T.A. Bredeweg, S.S. Chirayath, C.M. Folden, III, "Isolating Trace Fission Product Elements in Separated Plutonium for Applications in Nuclear Forensics", Journal of Radioanalytical and Nuclear Chemistry, Published online October 17, 2020.


56. S.M. Woo, S.S. Chirayath, M. Fuhrmann, "Nuclear fuel reprocessing: Can pyro-processing reduce nuclear proliferation risk?", Energy Policy, 144, (2020).


57. T. Aoki, S.S. Chirayath, H. Sagara, "Proliferation Resistance Evaluation of an HTGR Transuranic Fuel Cycle using PRAETOR code", Annals of Nuclear Energy, 141 (2020).


58. A. Sagadevan, S.S. Chirayath, "Feasibility Study of Remote Monitoring Systems of Spent Nuclear Fuel Dry Cask Storage", 61st Annual Meeting of the Institute of Nuclear Materials Management, Baltimore, Maryland, 12-16 July 2020.


59. S. Chirayath, R. Aoyagi, H. Sagara, "Feasibility Study of Nuclear Material Accounting in a Molten Salt Fast Reactor to Develop a Safeguards Approach", 61st Annual Meeting of the Institute of Nuclear Materials Management, Baltimore, Maryland, 12-16 July 2020.


60. S.M. Woo, S.S. Chirayath, C. Kang, Y. Minamigawa, "Semi-empirical analysis of the spatial variation of Pu quality ratio in a reactor core for application in pyroprocessing of used nuclear fuel", Annals of Nuclear Energy, 138 (2020).


61. K. Kalra, A. Goel, and S. Chirayath, "Evaluation of the Effectiveness of Physical Protection System for Nuclear and Other Radioactive Materials Used in Research Institutes", International Conference on Nuclear Security: Sustaining and Strengthening Efforts, Vienna, Austria, 10-14 February 2020.


62. Y.A. Setiawan, S.S. Chirayath, E.D. Kitcher, "MAPPS: A stochastic computational tool for multi-path analysis of physical protection systems", Annals of Nuclear Energy, available online 5 October 2019.


63. D. Mulyana, S.S. Chirayath, "Investigation of Nuclear Safeguards Attributes Through Neutronics Simulation of Pebble Bed Reactor Core", 2019 ANS Winter Meeting and Nuclear Technology Expo, Washington, D.C., 17 - 21 November 2019.


64. A. Sagadevan S.S. Chirayath, "Safeguards Approaches for Remote Monitoring System of Spent Nuclear Fuel Dry Cask Storage", 2019 ANS Winter Meeting and Nuclear Technology Expo, Washington, D.C., 17 - 21 November 2019.


65. S.R. Kurbanbekov and S.S. Chirayath, "An Estimate of North Korean HEU Stockpile for the given Natural Uranium Reserve and Enrichment Capacities", 60th Annual Meeting of the Institute for Nuclear Materials Management (INMM), Palm Desert, California, 14-18 July 2019.


66. A. Milojevich, S. Martinson, C. Marianno, S. Chirayath, J. Creasy, "Enhancing Research Reactor Safeguards Through the Use of Mailbox Declarations", 60th Annual Meeting of the Institute for Nuclear Materials Management (INMM), Palm Desert, California, 14-18 July 2019.


67. S. Martinson, A. Milojevich, C. Marianno, and S. Chirayath, "Misuse of Research Reactors and Technical Parameters for Potential Mailbox Declarations", Poster. 60th Annual Meeting of the Institute for Nuclear Materials Management (INMM), Palm Desert, California, 14-18 July 2019.


68. M.M. Mendoza, A.A. Sagadevan, J.N. Wagner, S.S. Chirayath, E.D. Kitcher, H. Rysz, L. Anuar, A. Perry, A. Maldonado, M. Ramirez, D. Mulyana, A. Edwin, S. Martinson, "Advanced Reactor Safeguards Workshop at Texas A&M University", Poster. 60th Annual Meeting of the Institute for Nuclear Materials Management (INMM), Palm Desert, California, 14-18 July 2019.


69. K. Rathore, J. Osborn, M. Fuhrmann, S. Chirayath, "Investigating Iran’s Nuclear Latency Subject to the Status of the Joint Comprehensive Plan of Action", 60th Annual Meeting of the Institute for Nuclear Materials Management (INMM), Palm Desert, California, 14-18 July 2019.


70. K. Rathore S.S. Chirayath, "Investigation on Iran’s Nuclear Weapon Latency Time in Case of Non-Compliance with JCPOA", Transactions of the American Nuclear Society, 120 (2019).


71. K. Smith, P. Tsvetkov, M. Kim, L. Shao, S.S. Chirayath, "Floating Micro-Modular-Reactor Concept for Localized Power Outages", Transactions of the American Nuclear Society, 120 (2019).


72. S. Woo, S. Prasad, S. Chirayath, "Investigation of Void Formations Using Neutron Measurements in Filler Materials for Dual-Purpose Canisters", Transactions of the American Nuclear Society, 120 (2019).


73. J. King, S. Chirayath, E. Aboud, V. Bautista, P. Behne, H. Boo, R. Brownfield, J. Chisholm, K. Cook, A. Edwin, H. Kistle, P. O’Neal, E. Ordonez, M. Ramirez, S. Ricketts, R. Suh, "Safety Evaluation of a Spent Fuel Dry-Storage Canister with Various Fill Materials", Transactions of the American Nuclear Society, 120 (2019).


74. S.R. Kurbanbekov, S.M. Woo, S.S. Chirayath, "Analysis of the DPRK’s Nuclear Weapons Capabilities by Estimating Its Highly Enriched Uranium Stockpile and Natural Uranium Reserves", Science and Global Security, 27, 1, (2019).


75. E.D. Kitcher, J.M. Osborn, S.S. Chirayath, "Sensitivity Studies on a Novel Nuclear Forensics Methodology for Source Reactor-type Discrimination of Separated Weapons Grade Plutonium", Nuclear Engineering Technology, 51, 5 (2019).


76. K.J. Glennon, J.M. Osborn, J.D. Burns, E.D. Kitcher, S.S. Chirayath, C.M. Folden III, "Measuring Key Sm Isotope Ratios in Irradiated UO2 for use in Plutonium Discrimination Nuclear Forensics", Radioanalytical and Nuclear Chemistry, 320, 2 (2019).


77. J.M. Osborn, K.J. Glennon, E.D. Kitcher, J.D. Burns, C.M. Folden III, S.S. Chirayath, "Experimental Validation of a Nuclear Forensics Methodology for Source Reactor-Type Discrimination of Chemically Separated Plutonium", Nuclear Engineering and Technology, 51, 2 (2019).


78. S. Woo, H. Boo, S.S. Chirayath, and K. Jeong, "Investigations on Detecting Potential Nuclear Material Diversion from a Pyroprocessing Facility", Nuclear Technology, 205, 3 (2019).


79. S.M. Woo, and S.S. Chirayath, "Evaluation of Nuclear Material Accountability by the Probability of Detection for Loss of Pu (LOPu) Scenarios in Pyroprocessing", Nuclear Engineering and Technology, 51, 1(2019).


80. A. Sagadevan and S. Chirayath, "Information driven safeguards approach for remote monitoring system of dry cask storage", Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Available online 22 December 2018.


81. K. Hogue, J. Cooley, S.S. Chirayath, "Safeguards by Design in Nuclear Engineering Design Courses: Engaging Universities in Safeguards by Design", IAEA Symposium on International Safeguards, Vienna, Austria, November 5-8, (2018).


82. H. Boo, S. Woo, S. Chirayath, "Safeguards Analysis of Pyroprocessing Product Ingot Diversions Possible Through Neutron Source Substitutions", ANS Topical on Advances in Nuclear Nonproliferation Technology & Policy Conference (ANTPC), September 23-27, (2018).


83. R. Schafer, E. Kitcher, S. Chirayath, "Uncertainty Analysis of Fission Product Concentrations in MCNP Depletion Calculations", ANS Topical on Advances in Nuclear Nonproliferation Technology & Policy Conference (ANTPC), September 23-27, (2018).


84. Y. Minamigawa, E. Kitcher, S. Chirayath, "Statistical Analysis of Fission Product Concentration Uncertainties from MCNP6 Multi-Time Step Depletion Calculation", ANS Topical on Advances in Nuclear Nonproliferation Technology & Policy Conference (ANTPC), September 23-27, (2018).


85. S.M. Woo, S.S. Chirayath, and M. Fratoni, "Nuclide Composition Non-uniformity in Used Nuclear Fuel for Considerations in Pyroprocessing Safeguards", Nuclear Engineering and Technology, 50, 7 (2018).


86. S.M. Woo, M.S. Yim, and S.S. Chirayath, "The Cost-Benefit Analysis of the Optimal Type-I (α) and Type-II (β) Error Values for Nuclear Material Accounting and Safeguards", Progress in Nuclear Energy, 108 (2018).


87. J. Osborn, K. Glennon, E. Kitcher, J. Burns, C. Folden, I. III, and S.S. Chirayath, "Computational and Experimental Forensics Characterization of Weapons-grade Plutonium Produced in a Thermal Neutron Environment", Nuclear Engineering and Technology, 50, 6 (2018).


88. Y. Setiawan S.S. Chirayath, "Stochastic Approach in Single Path Analysis of Adversary’s Intrusion Strategies in Physical Protection System (PPS) Effectiveness Evaluation", presented at 59th Annual Meeting of the Institute of Nuclear Materials Management, Baltimore, Maryland, July 22-26, 2018.


89. D. Mulyana S.S. Chirayath, "Nonproliferation Challenges within High Temperature Gas Reactor Fuel Cycles", presented at 59th Annual Meeting of the Institute of Nuclear Materials Management, Baltimore, Maryland, July 22-26, 2018.


90. E. Kitcher, J. Osborn , M. Marciniak, G. Garcia, B. Batista, S. Chirayath, "Application of Safeguards to a Molten Salt Reactor", presented at 59th Annual Meeting of the Institute of Nuclear Materials Management, Baltimore, Maryland, July 22-26, 2018.


91. J. Osborn, K. Glennon, E. Kitcher, J. Burns, C. III, S. Chirayath, "Experimental Validation of a Nuclear Forensics Methodology for Source Reactor-Type Discrimination of Chemically Separated Plutonium", presented at 59th Annual Meeting of the Institute of Nuclear Materials Management, Baltimore, Maryland, July 22-26, 2018.


92. A. Sagadevan, S. Chirayath, A. Worrall, "Risk Informed Safeguards Approaches for Molten Salt Reactors", presented at 59th Annual Meeting of the Institute of Nuclear Materials Management, Baltimore, Maryland, July 22-26, 2018.


93. S. Woo, H. Boo, S. Chirayath, K. Jeong, M. Fuhrmann, "Investigations on Detecting Potential Nuclear Material Diversion from a Pyroprocessing Facility", presented at Pacific Northwest National Laboratory, Richland, Washington, 1-2 May 2018.


94. M. Hawila, S. Chirayath, "Combined nuclear safety-security risk analysis methodology development and demonstration through a case study", Progress in Nuclear Energy, 105 (2018).


95. J. Osborn, E. Kitcher, J. Burns, C.M. Folden, S. Chirayath, "Nuclear Forensics Methodology for Reactor-Type Attribution of Chemically Separated Plutonium", Nuclear Technology, 201, 1 (2018).


96. S. Chirayath, "Panel on Challenges for Human Resource Development", The International Forum on Peaceful Uses of Nuclear Energy, Nuclear Nonproliferation and Nuclear Security: Strengthening Nuclear Terrorism Countermeasures and Human Resource Development towards the Tokyo 2020 Olympic and Paralympic Games, Tokyo, Japan, December 7, 2017.


97. E.D. Kitcher and S.S. Chirayath, "Improving Multi-Physics Coupling Scheme for the Analysis of Xenon-Induced Power Oscillations", Transactions of American Nuclear Society, 2017 ANS Winter Meeting, October 29-November 2, (2017).


98. S.S. Chirayath, P.J. O'Neal, "Methodology Development for Combined Evaluation of Security and Safety Risk", Transactions of American Nuclear Society, 2017 ANS Winter Meeting, October 29-November 2, (2017).


99. S. Chirayath, "Small Modular Reactor Deployment: Current Status of Reactor Designs, NRC Licensing and Economics", Invited Lecture to the IAEA-Country Delegation hosted by TEES-Nuclear Power Institute, October 11 2017.


100. T. Aoki, H. Sagara, S.S. Chirayath, "Feasibility Study of TRISO Fuel for Efficient Pu Incineration and 3S Feature Enhancement Requirements for Measurement Accuracy of the Pu Verification Technique", ” 38th Annual Meeting of the Institute of Nuclear Materials Management Japanese Chapter, Japan, October, 2017.


101. S. Chirayath, "Nuclear Security Education, Research and Training at Texas A&M University", Invited Speaker at the Workshop on Industry View to Nuclear Security/Nuclear Fuel and Radioactive Waste Management”, May 9-11, 2017, Bucharest, Romania.


102. S. Chirayath, "Nuclear Security Education and Training in Texas A&M University", The 7th International Symposium and Seminar on Global Nuclear Human Resource Development for Safety, Security and Safeguards, August 28 - September 1, 2017. Tokyo, Japan.


103. J. Chen, M. Shah, S.S. Chirayath, C. Gariazzo, C.M. Marianno, "Radiological Surveillance System Optimization and Development of Facility Operational Guidelines for the Safeguard Laboratory Complex at Texas A&M University", 58th Annual Meeting of the International Nuclear Materials Management, Indian Wells, CA, 16-20 July 2017.


104. S. Chirayath, "Target Identification in Nuclear Facilities and Insider Threat Challenges", Invited Speaker at Pandit Deendayal Petroleum University, Gandhinagar, India, 31 May 2017.


105. S. Chirayath, "Small Modular Reactor Deployment: Current Status of Reactor Designs, NRC Licensing and Economics", Invited Lecture to the IAEA-Kenyan Delegation hosted by TEES-Nuclear Power Institute, May 22 2017.


106. E. Kitcher S.S. Chirayath, "A neutron transport and thermal hydraulics coupling scheme to study xenon induced power oscillations in a nuclear reactor", Annals of Nuclear Energy, 106 (2017).


107. Y. Aoki, H. Sagara, and S.S. Chirayath, "Impact of Curium Decontamination on MUF and MUF-uncertainty in TRU Fuel Cycle Employing High Temperature Gas Cooled Reactors", 38th 2017 Annual Meeting of the Atomic Energy Society of Japan, Tokai University Campus, Japan, March 27-29, 2017.


108. M.W. Swinney, C.M. Folden III, R.J. Ellis, and S.S. Chirayath, "Experimental and Computational Forensics Characterization of Weapons-grade Plutonium Produced in a Fast Reactor Neutron Environment", Nuclear Technology, 197, 1 (2017).


109. S.S. Chirayath, C.M. Marianno, K.H. Ragusa, K.L. Peddicord, "Preparing the Next Generation of Nuclear Security Professionals - The Technology/Policy Nexus", International Conference on Nuclear Security: Commitments and Actions, Vienna, Austria, 5-9 December 2016.


110. M.A. Hawila and S.S. Chirayath, "Nuclear Security Risk Analysis: An Insider-Outsider Collusion Scenario", International Journal of Nuclear Security, 2, 2 (2016).


111. P. Mendoza, S.S. Chirayath, C.M. Folden, "Fission Product Decontamination Factors for Plutonium Separated by PUREX from Low-Burnup, Fast-Neutron Irradiated Depleted UO2", Applied Radiation and Isotopes, 118 (2016).


112. M.A. Hawila and S. Chirayath, "Probabilistic Risk Assessment of Spent Fuel Pool Cooling System Failure Considering Safety and Security Initiating Events", ANS Winter Meeting & Expo, Las Vegas, NV, 06-10 November 2016.


113. T. Aoki, S.S. Chirayath, H. Sagara, "Material Balance Area Design for the Transuranic Fuel Cycle Employing High Temperature Gas Cooled Reactors", ANS Winter Meeting & Expo, Las Vegas, NV, 06-10 November 2016.


114. E.D. Kitcher S.S. Chirayath, "Neutronics and thermal hydraulics analysis of a small modular reactor", Annals of Nuclear Energy, 97 (2016).


115. S.S. Chirayath, C.M. Marianno, C.A. Gariazzo, K.H. Ragusa, "Ten years of Nuclear Security Education, Research and Training at Texas A&M University", ANS Topical Meeting: Advances in Nuclear Nonproliferation Technology and Policy Conference (ANTPC), Santa Fe, NM, USA, 25-30 September 2016.


116. C. Gariazzo, S. Chirayath, C.M. Marianno, M. Shah, D.M. Trombetta, "Developing a Radiological Surveillance Education Exercise at Texas A&M University", 57th Annual Meeting of the Institute for Nuclear Materials Management (INMM), Atlanta, Georgia, 24-28 July 2016.


117. S. Chirayath, M.A. Hawila, "Methodology for Combined Nuclear Security and Safety Risk Analysis", 57th Annual Meeting of the Institute for Nuclear Materials Management (INMM), Atlanta, Georgia, 24-28 July 2016.


118. T. Jacomb-Hood, L. Scott, M. Shah, K. Ford, S. Horowitz, M. Subbaiah, C. Gariazzo, S. Chirayath, D. Kovacic, S. Mladineo, M. Schanfein, M. Koskelo, "The Safeguards and Organizational Culture Workshop", 57th Annual Meeting of the Institute for Nuclear Materials Management (INMM), Atlanta, Georgia, 24-28 July 2016.


119. S. Chirayath and J. Osborn, "Assessment of Inverse Techniques Used in Forensics Attribution Analysis of Trace Nuclide Ratios in Weapons-Grade Plutonium", 57th Annual Meeting of the Institute for Nuclear Materials Management (INMM), Atlanta, Georgia, 24-28 July 2016.


120. G. Agrawal, S.S. Chirayath, P. Munshi, "Determination of Physical Protection System Effectiveness of a Hypothetical Facility, the Lagassi Institute of Medicine and Physics (LIMP)", 57th Annual Meeting of the Institute for Nuclear Materials Management (INMM), Atlanta, Georgia, 24-28 July 2016.


121. V. Pandey, S. Chirayath, S. Singh, "Synergy Between Nuclear Safety and Security: Modeling of Relationship for Individuals to Reduce Risk of Insider Threat", 57th Annual Meeting of the Institute for Nuclear Materials Management (INMM), Atlanta, Georgia, 24-28 July 2016.


122. J.M. Osborn, S.S. Chirayath, "Assessment of Inverse Techniques Used in Forensics Attribution Analysis of Trace Nuclide Ratios in Weapons-Grade Plutonium", 9th Annual DNDO Academic Research Initiative (ARI) Grantees Review Meeting, Atlanta, GA, USA, July 11-14, 2016.


123. S. Chirayath, "Nuclear Security Education at Texas A&M University", 5th International Symposium and Seminar on Global Nuclear Human Resource Development for Safety, Security, and Safeguards, 21 February - 3 March, 2016, Tokyo, Japan. (Invited)


124. E. Kitcher and S.S. Chirayath, "Analysis of a Generic Small Modular Integral Pressurized Water Reactor: Burnable Absorber Rod Materials", 2015 American Nuclear Society Winter Meeting, Washington, DC, November 8-12, 2015.


125. C. Hughes, A. Daluka, and S.S. Chirayath, "Developing a Mathematical Scheme to Combine Single-Parameter Perturbation Results in Radiation Transport Calculations to Predics Joined Paremeter Perturbations", 2015 American Nuclear Society Winter Meeting, Washington, DC, November 8-12, 2015.


126. S.S. Chirayath, "Nuclear Security Education at Texas A&M University", International Nuclear Atlantic Conference, Sao Paulo, Brazil, 4-9 October 2015.


127. T.M. Martin, L. Vasudevan, and S.S. Chirayath, "Correlation between Exposure Rate and Residual Activity in Felines undergoing I-131 Thyroid Ablation Therapy", Health Physics, 109, 2 (2015).


128. Sunil Chirayath, Royal A. Elmore, "Nuclear Facility Insider and Outsider Threat Upgrades to Proliferation Resistance Analysis Tool, PRAETOR", INMM 56th Annual Meeting, Indian Wells, California, 12-16 July 2015.


129. Mohammad Hawila, Sunil S. Chirayath, William Charlton. , "Nuclear Security Risk Evaluation Using Adversary Pathway Analysis Methodology for an Insider-Outsider Collusion Scenario", INMM 56th Annual Meeting, Indian Wells, California, 12-16 July 2015.


130. S.S. Chirayath, C.M. Folden, III, and D.R. Boyle, "Nuclear forensics analysis of separated plutonium of foreign fuel cycles (NFASP) project: assessment of unique trace elements and isotope ratios in separated plutonium from low burnup nuclear fuel", 8th DNDO-ARI Grantees Conference, University of Texas, Dallas, TX, USA, July 7-9, (2015).


131. C.A. Gariazzo, K.H. Ragusa, D.R. Boyle, W.S. Charlton, S.S. Chirayath, C.M. Marianno, P. Nelson, Jr., "The Nuclear Security Science and Policy Institute at Texas A&M University", International Journal of Nuclear Security, 1, 1 (2015).


132. M.D. Toit and S.S. Chirayath, "Proposal for Improved Nuclear Fuel Utilisation and Economic Performance by Utilising Thorium", Journal of Energy in Southern Africa (JESA), 26, 2 (2015).


133. R. Kelly, P. Tsvetkov, S.S. Chirayath, J. Poston, and E. Kitcher, "Uncertainty Quantification of Concrete Utilized in Dry Cask Storage", Nuclear Technology, 190, 1 (2015).


134. T.K. Bhardwaj, P. Mendoza, R. Du, M. Bencomo, J. Allred, M. Swinney, C. Folden, S.S. Chirayath, "Determination of decontamination factor for various radioisotopes during the PUREX process of irradiated DUO2", 249th American Chemical Society National Meeting and Exposition, Denver, CO, USA, March 22-26, 2015.


135. S.S. Chirayath, J.M. Osborn, and T.M. Coles, "Trace Fission Product Ratios for Nuclear Forensics Attribution of Weapons-grade Plutonium from Fast and Thermal Reactors", Journal of Science & Global Security, 23, 1 (2015).


136. S.S. Chirayath , R. Elmore, G. Hollenbeck, N.G. Chandregowda, W.S. Charlton, R. Metcalf, and J.C. Ragusa, "Proliferation Resistance Analysis And Evaluation Tool for Observed Risk (PRAETOR) Methodology", Journal of Nuclear Materials Management, 43, 2 (2015).


137. S. Chirayath, "Safeguards Issues and Recommendations for a Fast Reactor Fuel Cycle", 18th Annual Meeting of the Korea chapter of the Institute of Nuclear Materials Management (INMM), Daejeon, South Korea, November 13, 2014 (invited).


138. M.W. Swinney S.S. Chirayath, "Comparison of FBR and HFIR Monte-Carlo Simulations with Validation from Gamma Spectroscopy in Support of the NFASP Project", 2014 ANS Winter Meeting, Annaheim, CA, 9-13 November 2014


139. R.A. Elmore, S.S. Chirayath, S. Edreev, "Proliferation Resistance Analysis of Nuclear Fuel Cycle Facilities to Quantify the Importance of Containment, Surveillance and Physical Protection Systems", 2014 American Nuclear Society Winter Meeting, Annaheim, CA, 9-13 November 2014


140. S.S. Chirayath, R.A. Elmore, W.S. Charlton, "Containment and Surveillance and Physical Protection Updates for Proliferation Resistance Analysis Using PRAETOR", IAEA Symposium on International Safeguards, Vienna, Austria, October 20-24, 2014.


141. T.K. Bhardwaj, J. Allred, K. Jones, P. Mendoza, R. Du, C. Folden, S.S. Chirayath, "Nuclear forensics program at Texas A&M University", 248th American Chemical Society National Meeting, San Francisco, CA, USA, August 10-14, 2014.


142. J.M. Osborn, T.M. Coles, and S.S. Chirayath, "Trace Fission Product Ratios for Nuclear Forensics Attribution of Weapons-Grade Plutonium Separated from Fuel Irradiated in Thermal and Fast Reactor Types", 55th Annual Meeting of the Institute of Nuclear Materials Management, Atlanta, Georgia, 20-14 July 2014.


143. A. Kumar, S.S. Chirayath, and P.V. Tsvetkov, "Analysis of a Sustainable Gas Cooled Fast Breeder Reactor Concept", Annals of Nuclear Energy, 69 (2014).


144. M.W. Swinney and S.S. Chirayath, "Comparison of FBR and HFIR monte-carlo simulations with validation from gamma spectroscopy in support of the the NFASP project", 7th Annual NSF-DNDO Academic Research Initiative (ARI) Grantees Review Meeting, Leesburg, VA, USA, June 24-26, 2014.


145. J.M. Osborn et al., "Trace fission product ratios for nuclear forensics attribution of weapons-grade plutonium separate from fuel irradiated in thermal and fast reactor types", 7th Annual NSF-DNDO Academic Research Initiative (ARI) Grantees Review Meeting, Leesburg, VA, USA, June 24-26, 2014.


146. S.S. Chirayath, "Nuclear forensics analysis of separated plutonium of foreign fuel cycles (NFASP) project: assessment of unique trace elements and isotope ratios in separated plutonium from low burnup nuclear fuel", 7th Annual NSF-DNDO Academic Research Initiative (ARI) Grantees Review Meeting, Leesburg, VA, USA, June 24-26, 2014.


147. S.S. Chirayath, D.R. Boyle, C.M. Folden III, "Experimental and Computational Assessment of Unique Trace Elements and Isotopes Ratios in Plutonium from Depleted Uranium Irradiated in Fast Reactor Blankets", 7th DNDO-ARI Grantees Conference, Leesburg, VA, USA, June 2014.


148. N.G. Chandregowda, S.S. Chirayath, W.S. Charlton, Y. Ham, and S. Sitaraman, "Assessment of the Fingerprinting Method for the Verification of Spent Fuel in MACSTOR KN- 400 CANDU Spent-Fuel Dry Storage", Nuclear Technology, 184, 3 (2013).


149. R. Elmore, W.S. Charlton, S. Chirayath, "Sensitivity Analysis with PRAETOR for Diversion of Plutonium Self-Protected with Pu-238", Transactions of the 2013 American Nuclear Society Winter Meeting, Washington, D.C., 10-14 November 2013.


150. R. Elmore, W.S. Charlton, S. Chirayath, "Nuclear Proliferation Connection Implications within an Agent-Based Modeling Environment", Computational Social Sciences Society of the Americas Annual Conference, Santa Fe, NM, 22-25 August 2013.


151. J.M. Osborn et al., "Isotopic analysis of fast breeder reactor core to support the plutonium fingerprinting for forensics (PuFF) project", 6th Annual NSF-DNDO Academic Research Initiative (ARI) Grantees Review Meeting, Lansdowne, VA, USA, July 30-31 & August 1, 2013.


152. T.M. Coles et al., "Nuclear forensics signature analysis of thermal reactor produced weapons-grade plutonium", 6th Annual NSF-DNDO Academic Research Initiative (ARI) Grantees Review Meeting, Lansdowne, VA, USA, July 30-31 & August 1, 2013.


153. S.S. Chirayath et al., "Plutonium fingerprinting for forensics (PuFF) project: assessment of unique trace elements and isotope ratios in separate plutonium from low burnup nuclear fuel", 6th Annual NSF-DNDO Academic Research Initiative (ARI) Grantees Review Meeting, Lansdowne, VA, USA, July 30-31 & August 1, 2013.


154. J.W. Poston, S.S. Chirayath, P.V. Tsvetkov, C.M. Marianno, R.P. Kelly, and E.D. Kitcher, "Radiation Shield Design and Dose Rate Analysis of the Independent Spent Fuel Dry Cask Storage Installation at Commanche Peak Power Plant", Health Physics Society 58th Annual Meeting, Madison, Wisconsin, USA, 7-11, July 2013.


155. A. Khudoleeva, S.S. Chirayath, and W.S. Charlton, "Conceptual Development of the Remote Monitoring System for Safeguarding of the Dry Cask Storage Facilities", INMM 54th Annual Meeting, 14-18 July 2013, Palm Desert, California, USA.


156. J.M. Osborn, S.S. Chirayath, W.S. Charlton, "Neutronics Analysis of Fast Breeder Reactor Core to Support the Plutonium Fingerprinting for Forensics (PuFF) Project", INMM 54th Annual Meeting, 14-18 July 2013, Palm Desert, California, USA.


157. T.M. Coles, S.S. Chirayath, W.S. Charlton, "Nuclear Forensics Signature Analysis of Thermal Reactor Produced Weapons-grade Plutonium", INMM 54th Annual Meeting, 14-18 July 2013, Palm Desert, California, USA.


158. E. Kitcher, S.S. Chirayath, "Neutronics Performance Analysis of a Small Modular Integral Pressurized Water Reactor", 2013 American Nuclear Society Annual Meeting, Atlanta, GA, June 16-20, 2013.


159. J.M. Osborn, T.M. Coles, A.R. Twaddle, S.S. Chirayath, W.S. Charlton, "Nuclear forensics signature analysis of fast and thermal reactor produced weapons-grade plutonium", 245th American Chemical Society National Meeting, New Orleans, LA, USA, April 7-11, 2013.


160. R. Elmore, W.S. Charlton, S. Chirayath, "Comparative Analysis of Nuclear Nonproliferation Proliferation Resistance Approaches", Transactions of the 2012 American Nuclear Society Winter Meeting, San Diego, CA, 11-15 November 2012.


161. R. Elmore, W.S. Charlton, S. Chirayath, "Nuclear Proliferation Resistance Model Backgrounds and Method Comparative Analysis", 84th Annual National Technical Association Conference, Baltimore, MD, 19-21 September 2012.


162. N.G. Chregowda, W.S. Charlton, S.S. Chirayath, Y. Ham, S. Sitaraman, G.H. Ahn , "Assessment of the Fingerprinting Method for Verification of Spent Fuel in MACSTOR KN-400 CANDU Spent Fuel Dry Storage", 53rd Annual Meeting of the Institute of Nuclear Materials Management, Orlando, Florida, 15-19 July 2012.


163. R.A. Elmore, W. Charlton, and S. Chirayath., "Proposed Benchmark Cases for Proliferation Risk Assessment Modeling.", 53rd Annual Meeting of the Institute of Nuclear Materials Management, Orlando, Florida, 15-19 July 2012.


164. J.M. Osborn, T.M. Coles, AR. Twaddle, and S.S. Chirayath, "Neutronics Analysis of Fast Breeder Reactor Core to Support the Plutonium Fingerprinting for Forensics (PuFF) Project", 5th Annual DNDO-NSF ARI Grantees Conference, Leesburg, Virginia, 23-25 July 2012.


165. G.M. Gaukler, C. Li, S.S. Chirayath, and Y. Ding, "Detecting Nuclear Materials Smuggling: Performance Evaluation of Container Inspection Policies", Risk Analysis, 32, 3 (2012).


166. William S. Charlton, David Boyle, Sunil Chirayath, David G. Ford, Claudio A. Gariazzo, Craig Marianno, Kelley Ragusa, Alexer Solodov, "Educating the Next Generation of Nuclear Safeguards and Security Experts at TAMU", GLOBAL 2011, Makuhar, Japan, December 11-16, 2011.


167. S. Chirayath, P. Tsvetkov, J. Ragusa, R. Skoda, C. Gariazzo, "Methodology for Public Safety, Proliferation, and Economics Assessment of SMRs", Transactions of the American Nuclear Society, Vol. 105, Washington, D.C., October 30-November 3, 2011


168. P. Tsvetkov, S. Chirayath, J. Ragusa, S. McDeavitt, C. Gariazzo, J. Johns, A.A. Rashdan, V. Patel, A. Jati, G.E. Rochau, "High Temperature super-critical CO2-cooled Integrated Multi-Modular Thermal Reactor", Transactions of the American Nuclear Society, Vol. 105, Washington, D.C., October 30-November 3, 2011


169. A. Khudoleeva, G. Maksimovich Pshakin, V. Fedchenko, A. Solodov, O. Mikhaylova, S.S. Chirayath , "Safeguard Game -- The IAEA Inspection in an Imaginary State", 52nd Annual Meeting of the Institute for Nuclear Materials Management (INMM), Palm Desert, CA, July 17-21, 2011.


170. C.A. Gariazzo, S.S. Chirayath, "Advancing a Systems Optimization Tool for Monitoring Special Nuclear Material", 52nd Annual Meeting of the Institute for Nuclear Materials Management (INMM), Palm Desert, CA, July 17-21, 2011.


171. W.S. Charlton, D. Boyle, S.S. Chirayath, D.G. Ford, C.A. Gariazzo, C. Marianno, K. Ragusa, A. Solodov, "Nuclear Nonproliferation and Safeguards Education at TAMU: Embracing Novel Teaching Practices", 52nd Annual Meeting of the INMM, Palm Desert, CA, July 17-21, 2011.


172. G.M. Gaukler, C. Li, R. Cannaday, S.S. Chirayath, and Y. Ding, "Detecting Nuclear Materials Smuggling: using Radiography to improve Container Inspection Policies", Annals of Operation Research, 187, 1 (2011).


173. J. Justina, C. Marianno, and S. Chirayath, "Radiation Transport Simulation Studies using MCNP for a Cow Phantom to Determine an Optimal Detector Configuration for New Livestock Portal", 56th Annual Meeting of the Health Physics Society, West Palm Beach, Florida, June 26-30, 2011.


174. C. Gariazzo, S. Chirayath, "Developing a Systems Optimization Tool for Monitoring Special Nuclear Material", 33rd ESARDA Annual Meeting: Symposium on Safeguards and Nuclear Material Management, May 16-20, 2011, Budapest, Hungary.


175. L. Vasudevan, W.D. Reece, S.S. Chirayath, and S. Aghara, "Characterization of Neutron and Gamma Dose in the Irradiation Cell of Texas A&M University Research Reactor", ASTM 14th International Symposium on Reactor Dosimetry, Bretton Woods, New Hampshire, USA, May 22-27, 2011.


176. W. S. Charlton, W. Bangerth, D. R. Boyle, S. S. Chirayath, G. Gaukler, C. Marianno, A. Vedlitz, "SHIELD: A Framework for Evaluating and Guiding Nuclear Detection System Development", The 4th annual Domestic Nuclear Detection Office (DNDO) Academic Research Initiative (ARI) Grantees Conference, Alexandria, Virginia, April 26-28, 2011.


177. G. M. Gaukler, Y. Ding, C. Li, S.S. Chirayath, "A Systems Framework for Modeling the Detection of Smuggled Nuclear Materials", Poster presented at The 4th annual Domestic Nuclear Detection Office (DNDO) Academic Research Initiative (ARI) Grantees Conference, Alexandria, Virginia, April 26-28, 2011.


178. R.G. McClarren, J. Madsen, M.L. Adams, M.P. Adams, N. Amato, N. Castet, S.S. Chirayath, W.D. Hawkins, L. Rauchwerger, T. Smith, "Deterministic Transport Capability for HEU Sources in Cargo Containers", Poster presented at The 4th annual Domestic Nuclear Detection Office (DNDO) Academic Research Initiative (ARI) Grantees Conference, Alexandria, Virginia, April 26-28, 2011.


179. M. Adams, N. Amato, M. Allmaras, W. Bangerth, S. Chirayath, J-L Guermond, G. Kanschat, P. Kuchment, J. Morel, J. Ragusa, L. Rauchwerger, J. Webster, "Detecting Small Low Emission Radiating Sources", Poster presented at The 4th annual Domestic Nuclear Detection Office (DNDO) Academic Research Initiative (ARI) Grantees Conference, Alexandria, Virginia, April 26-28, 2011.


180. S. Chirayath, W. Charlton, A. Stafford, C. Myers, B. Goddard, J. Alfred, M. Carroll, M. Sternat, and E. Rauch, "Risk Informed Safeguards Integration Studies for a Fast Reactor Fuel Cycle", 51st Annual Meeting of the Institute of Nuclear Materials and Management, Baltimore, MD, USA, July 11-15, 2010.


181. C. Gariazzo and S.S. Chirayath, "Using MCNP as a Vulnerability Assessment Tool on the TAMU Safeguards Laboratory", 51st Annual Meeting of the Institute of Nuclear Materials and Management, Baltimore, MD, USA, July 11-15, 2010.


182. J. Webster, W. Bangerth, M. Adams, N. Amato, S. Chirayath, J-L Guermond, G. Kanschat, P. Kuchment, J. Morel, J. Ragusa, L. Rauchwerger, "Using Statistics to Set Detector Threshold Curves", Poster presented at the Academic Research Initiative Grantees Conference, Washington, D.C., April 2010.


183. G. Gaukler, Y. Ding, C. Li, S.S. Chirayath, A. Vaughn, M. McGaha, "Detecting Nuclear Materials Smuggling: Combining Radiography and ATS to Improve Container Inspection", Poster presented at the Academic Research Initiative Grantees Conference, Washington, D.C., April 2010.


184. G. Gaukler, Y. Ding, C. Li, S.S. Chirayath, A. Vaughn, M. McGaha, "A Transportation Network Perspective for Detecting HEU in Seaborne Containers", Poster presented at the Academic Research Initiative Grantees Conference, Washington, D.C., April 2010.


185. S. Chirayath et al, "Multi-Attribute Utility Analysis for Proliferation Resistance Assessment", presentation at the INMM Workshop on Proliferation Assessments, Texas A&M University, College Station, February, 23-25, 2010.


186. S. Chirayath, W. Charlton, A. Stafford, C. Myers, B. Goddard, J. Alfred, M. Carroll, M. Sternat, E. Rauch, "Risk Informed Safeguards Approaches for Fast Reactor Fuel Cycle Utilizing MAUA based Proliferation Resistance Assessment", NSSPI-10-002, January 15, 2010.


187. S.S. Chirayath, G. Hollenbeck, J. Ragusa, P. Nelson, "Neutronic and nonproliferation characteristics of (PuO2-UO2) and (PuO2-ThO2) as fast reactor fuels", Nuclear Engineering and Design, 239, 10 (2009).


188. S.S. Chirayath, J. Ragusa, and P. Nelson, "Thorium blended and regular MOX burn-up studies for fast reactor fuel cycle safeguards", 50th annual meeting of INMM, July 12-16, 2009, Tucson, AZ, USA.


189. W. Bangerth, M. Adams, N. Amato, S. Chirayath, J-L Guermond, G. Kanschat, P. Kuchment, J. Morel, J. Ragusa, L. Rauchwerger, "Forward and inverse simulation capabilities for detection and imaging", Poster presented at the Academic Research Initiative Grantees Conference, Washington, D.C., April 6-9, 2009.


190. S. Chirayath, R. Metcalf, J. Ragusa, P. Nelson, "Assessment of Proliferation Resistance Requirements for Fast-Reactor Fuel-Cycle Facilities", 8th International Conference on Facility Operations - Safeguards Interface, Portland, Oregon, March 30 - April 4, 2008.