Design of an Online Monitoring System for Degrading Hardware Components Using Failure Modes and Effects Analysis
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Date
2016-05
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The Ohio State University
Abstract
A nuclear hybrid energy system, consisting of different energy subsystems such as nuclear, solar, and wind, involves frequent switching between different energy subsystems and between different controls. This can potentially lead to faster aging and failure of mechanical components. The increased usage of the turbine bypass system is considered to be the major difference between a nuclear hybrid energy system and a traditional nuclear power plant. Reliability analysis for designing such a complex system involves both high level fault propagation analysis at the conceptual design stage and low level failure prediction for specific components. The two main focuses of this thesis are: first to develop behavioral rules and functional failure logic for hardware components; and second to derive a degradation model of hardware components.
The behavioral rules and functional failure logic form the BehaviorModel of the function failure identification and propagation (FFIP) method. FFIP is an approach that can help designers at the conceptual design stage to identify which function(s) will be lost in a system and approximately when and where. The simulation results obtained using FFIP can serve as indicators for the designers to determine if the system is robust enough or if more safeguards/redundancies are necessary. Implementing the method will reduce redesign and maintenance costs in later design, implementation and operational stages.
The degradation model is a low level failure mode model that combines the effects of natural aging and frequent switching conditions. The model can be used for predicting components’ failure due to specific failure modes that are described in the behavioral rules. The result can serve as an indicator for conducting repair actions and maintenance to minimize Operation & Maintenance (O&M) costs. Both the high level FFIP method and the low level degradation model are demonstrated for the turbine bypass system in the secondary loop of a hybrid nuclear power plant.
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Reliability, Fault Propagation, Nuclear Hybrid Energy System, High Level Risk Analysis