Kaitlyn L. Ryder, Ryan Alles, Gabor Karsai, Nagabhushan Mahadevan, John W. Evans, Arthur F. Witulski, Michael J. Campola, Rebekah A. Austin, Ronald D. Schrimpf

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We present an overview of the Systems Engineering and Assurance Modeling (SEAM) platform, a web-browser-based tool which is designed to help engineers evaluate the radiation vulnerabilities and develop an assurance approach for electronic parts in space systems. The SEAM framework consists of three interconnected modeling tools, a SysML compatible system description tool, a Goal Structuring Notation (GSN) visual argument tool, and Bayesian Net and Fault Tree extraction and export tools. The SysML and GSN sections also have a coverage check application that ensures that every radiation fault identified on the SysML side is also addressed in the assurance case in GSN. The SEAM platform works on space systems of any degree of radiation hardness but is especially helpful for assessing radiation performance in systems with commercial-off-the-shelf (COTS) electronic components.


SEAM, radiation assurance, COTS, radiation hardness, radiation reliability

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Introduction to Model-based System Engineering and SysML. Document available at:

Architecting Spacecraft with SysML. Document available at:

CubeSat Reference Model. Document available at:

Object Management Group SysML website,

R. Cressant, P. David, V. Idiasiak and F. Kratz, "Increasing Reliability of Embedded Systems in a SysML Centered MBSE Process: Application to LEA Project", M-BED 2010, Dresden, Germany, 2010.

F. Mhenni, J-Y. Choley, A. Riviere, N. Nguyen and H. Kadima, "SysML and safety analysis for mechatronic systems", In Proceedings of the 9th France-Japan and 7th Europe-Asia Congress on Mechatronics/13th Int’l Workshop on on Research and Education in Mechatronics (REM), Paris, France, 2012, pp. 417-424.

F. J. Groen, J. W. Evans and A. J. Hall, "A vision for spaceflight reliability: NASA's objectives-based strategy", In Proceedings of the 2015 Annual Reliability and Maintainability Symposium (RAMS), Palm Harbor, FL, 2015, pp. 1-6.

R. A. Austin, N. Mahadevan, B. D. Sierawski, G. Karsai, A. F. Witulski and J. Evans, "A CubeSat-payload radiation-reliability assurance case using goal structuring notation", In Proceedings of the 2017 Annual Reliability and Maintainability Symposium (RAMS), Orlando, FL, 2017, pp. 1–8.

R. Austin, "A Radiation-Reliability Assurance Case Using Goal Structuring Notation for a CubeSat Experiment", M.S. Thesis, Vanderbilt University, 2016.

W. E. Vesely, F. F. Goldberg, N. H. Roberts and D. F. Haasl, Fault tree handbook. No. NUREG-0492. Nuclear Regulatory Commission, Washington DC, 1981.

J. Day, K. Donahue, M. Ingham, A. Kadesch, A. Kennedy and E. Post, "Modeling Off-Nominal Behavior in SysML", In Proceedings of the AIAA Infotech, Garden Grove, CA, 2012, pp. 1-10.

M. Izygon, H. Wagner, S. Okon, L. Wang, M. Sargusingh and J. Evans, "Facilitating R&M in spaceflight systems with MBSE", In Proceedings of the 2016 Annual Reliability and Maintainability Symposium (RAMS), Tucson, AZ, 2016, pp. 1-6.

R.A. Austin, N. Mahadevan, G. Karsai, A. Witulski, B. Sierawski, R. Schrimpf, and R.A. Reed, "Automatic Fault Tree Generation from Radiation-Induced Fault Models", In Proceedings of the 2020 Reliability and Maintainability Symposium (RAMS), Palm Springs, California, 2020, pp. 1-7.

J. Pearl, "Probabilistic reasoning in intelligent systems: networks of plausible inference", Elsevier, 2014.

A. H. A. Melani, and G. F. M. de Souz, "Mapping SysML Diagrams into Bayesian Networks: A Systems Engineering Approach for Fault Diagnosis", ASME J. Risk Uncertainty Part B, vol. 6, no. 3, pp. 031003, Sep. 2020

A. Witulski, B. Sierawski, R. Austin, G. Karsai, N. Mahadevan, R. Reed, R. Schrimpf, K. LaBel, J. Evans, and P. Adell, "Development of a Flight-Program-Ready Model-Based Assurance Platform", In Proceedings of the IEEE Aerospace Conference, Big Sky, Montana, 2020, pp. 1-8.

M. N. Sarvi, D. Abbasi-Moghadam, M. Abolghasemi, and H. Hoseini, "Design and implementation of a star-tracker for LEO satellite", Optik, vol. 208, 164343, April 2020.

Document with personal communication from K. B. Miller, August 19, 2020.

A. Witulski, B. Sierawski, R. Austin, G. Karsai, N. Mahadevan, R. Reed, R. Schrimpf, K. LaBel, J. Evans, and P. Adell, "Model-Based Assurance for Satellites with Commercial Parts in Radiation Environments ", In Proceedings of AIAA Small Satellite Conference, Logan, Utah, 2018, SSC18-WKV-04.


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ISSN: 0353-3670 (Print)

ISSN: 2217-5997 (Online)

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