A Visual System Analyzer (hereinafter called "ViSA") has been developed to support code users in their input preparations, on-line transient controls, and calculation result interpretations by providing a user friendly simulation environment for the widely used system analysis codes, MARS, RELAP5 and RETRAN. ViSA can be used with one of these system codes as its engine. To replace their complicated input structures, ViSA provides a graphical interface for base input data generation and modification. It also provides the on-line interactive control function, which is equipped in a compact simulator, to simulate the operator's actions during a transient simulation. It also provides various on-line graphical displays to give an in depth understanding of transient thermal-hydraulic behaviors in nuclear power plant. Since ViSA retains the same level of accuracy and the same input features as the original codes, it can be extended to a plant independent and most accurate nuclear engineering simulator.
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