Risk Assessment of a Known Capacitor Defect in the Artemis II Orion ECLSS Motor Controller Circuits
Authors
PrimaryColton Daniel Brehm— NASA · colton.d.brehm@nasa.gov
Co-authorjason.r.sturgis@nasa.gov— jason.r.sturgis@nasa.gov Edit Profile In 2024, the International Space Station (ISS) experienced a failure to start of its Universal Waste Management System (UWMS), ISS operational nomenclature for “toilet”. The failure was traced to the Digital Motor Controller (DMC) and was caused by excessive current leakage to ground in one of the critical capacitors. The source of leakage was from a delamination in the capacitor introduced during the manufacturing process. The Probabilistic Risk Assessment (PRA) team for Orion was interested in determining the incremental risk to the Artemis II mission due to the presence of capacitors from the same manufacturing lot in Orion’s Environmental Control and Life Support System (ECLSS) DMCs. The purpose of this presentation is to lay out the PRA team’s model inputs, Weibayes assessment, and integration of the resulting board-level risk with the existing Artemis II PRA model to quantify the incremental risk at the Artemis II mission-level. This assessment was used as part of the Orion Program’s risk informed decision-making process. The benefit of this PRA modeling strategy is that it can be used to quantify changes in risk for complex systems when there is a limited set of failure data available which is below the component-level modeling of the existing PRA model.
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