Abstract
Steam generator tube rupture is one of the most important accidents that is focused nowadays. In this work, the automating strategies of emergency operation are developed for SGTR accident in VVER 1000 nuclear reactor. After recognizing accident, reactor must be shut down and controlled properly in order to reach safe state of that. In control, cooldown is planned by establishing operational goals, forming strategies, and specifying operational means and constraints . According to operation manual reactor, cooling is done by means of releasing steam from steam valve BRU-A on steam generator. The reference set points of the controlled parameters are adaptively adjusted through fuzzy reasoning for optimal cooldown and depressurization. These strategies can make emergency operation optimal, and as well they considerably lengthen the operator response time. The validation of the proposed strategies was carried out using the micro-simulator with steam generator tube rupture(SGTR) events. The results indicate that the automation emergency operation successfully drives the plant at full power to a cold shutdown state with all the operational constraints satisfied. Analysis of result shows us:A. pressure of first loop wouldn't exceed primary value during accident. Maximum of pressure of reactor in second loop on steam generator B is 71.91 barg. B. maximum temperature of fuel rods and fuels don't exceed primary values. Maximum and minimum temperature of fuel rods are 788ᵒC and 546.95ᵒC respectively.
Highlights
In large and complex machine systems, many operations have become more difficult for users, resulting in a greater potential for operation errors
The automating strategies of emergency operation are proposed for achieving optimal shutdown in a pressurized water reactor (PWR)(VVER 1000)
The decision-making and control were investigated in order to develop the automating strategies
Summary
In large and complex machine systems, many operations have become more difficult for users, resulting in a greater potential for operation errors Such mistakes may cause serious accidents, especially in aircraft industries and power plants. Many machine systems have been automated through the introduction of modern computer and information technologies [1].When a nuclear power plant (NPP) is in a normal state, In order to maintain plant, routine monitoring and control status are performed by the operator. These tasks are not too complex that they can cause much cognitive burden or human error on one or more operators.
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