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In this paper we demonstrate the application of timed Petri Net methodology to the frequency of initiating faults in the coolant circulation system of a fictional nuclear reactor design. A second model is presented where the Petri Net is coupled with a Bond Graph representation of reactor thermodynamics, and distributions of temperatures reached by core coolant and fuel cladding during component failures is produced.

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An optimisation methodology is presented using the primary coolant circulation system of a nuclear reactor as its case study, the purpose of which is to find combinations of selected design and maintenance parameters to maximise the reactor safety and minimise monetary expenditure. The parameter space was sampled by a Monte Carlo method and Petri net modelling was used to predict the performance of each of these options. The optimal solutions were then extracted from the data via computation of the Pareto front, with further analysis conducted on parameter sets of interest.

During the period from October, 1957, to November, 1961, seventeen waterwall tube failures of the hydrogen-embrittlement type occurred in the three oil-fired, high makeup boilers of No. 1 Unit at Linden Generating Station, which supply steam to an adjacent refinery via an extraction turbine. Further failures have apparently been prevented by (1) reducing heat input to the affected areas by the installation of studded tubes; and (2) improving boiler-water quality by closer control.