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Dynamic formal verification is a key tool for providing ongoing confidencethat a system is meeting its requirements while in use, especially when pairedwith static formal verification before the system is in use. This paperpresents a workflow and Runtime Verification (RV) toolchain, Varanus, and theirapplication to an industrial case study. Using the workflow we manually derivea Communicating Sequential Processes (CSP) model from natural-language safetyrequirements documents, which Varanus uses as the monitor oracle. This reuse ofthe model means that the monitor oracle does not have to be developedseparately, risking inconsistencies between it and the model for staticverification. The approach is demonstrated by the offline RV of a teleoperatedmanipulation system, called MASCOT, which enables remote operations inside theJoint European Torus (JET) fusion reactor. We describe our model of the MASCOTsafety design documents (including how the modelling process revealed anunderspecification in the design) and evaluate the Varanus toolchain's utility.The workflow and tool provide validation of the safety documents, traceabilityof the safety properties from the documentation to the system, and a verifiedoracle for RV.

Offline Runtime Verification of Safety Requirements using CSP