Application of PRA for Risk-Informed Decision-Making on a Space Station Payload
This paper discusses the preliminary results of the first PRA study applied to a NASA payload designed to house various cell cultures and toxic fixatives aboard the International Space Station. The PRA serves two purposes. First, it is used as a tool to help target high-risk areas and thus improve the payload design and operations by avoiding potential over-design and under-design. Second, the results are being shown to NASA’s safety experts to ascertain whether equivalent or improved safety could be achieved in controlling the selected end state — crew exposure to fixatives — compared with traditional qualitative failure tolerance requirements. This first application of PRA to a payload demonstrates a practical design approach that could achieve one order of magnitude improvement relative to the baseline design, a noteworthy risk reduction. Future work is required to substantiate the findings and refine the analysis commensurate with higher fidelity design features.
KeywordsInternational Space Station European Space Agency Leak Detection Access Operation Baseline Design
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