| Under the support of the Future Advanced Nuclear FissionEnergy--Thorium-based Molten-Salt Reactor(TMSR) project of Shanghai Instituteof Applied Physics, Chinese Academy of Sciences, This thesis focused on thepreliminary research and fully-digitized implementation of Control Rod DriveMechanism(CRDM) control system Rod Control and Rod Positioning System(RCRPs) and the simulation study of the Power Control System (PCS) in TMSRbased on RCRPs.With the rapid development of communication technology and computerizedtechnology, the design of reactor control system was changed from analog scheme tofull digitalization scheme. As a key subsystem of TMSR control system, the fulldigitalizd RCRPs using both the Siemens Programmable Logic Controller (PLC) andthe ABB PLC modules needed to be implemented. The former (Siemens PLC scheme)was already successfully utilized in TMSR control rod experimental testbed whilst thelatter (ABB PLC scheme) was dedicated to PCS in the near future. Therefore, themain research content of this subject was the detailed implementation of SiemensPLC system used in control rod experimental testbed which included the hardwaresystem configuration, the whole software system design and the reliability analysis ofthe whole system. The functionality of rod control and rod positioning using ABBPLC system was also implemented and tested in the laboratory.The hardware system of Siemens PLC scheme in RCRPs was realized bystandard S7-400H redundant CPUs and dual channel ET200M distributed I/O station,together with redundant power supply for distributed I/O station. Multiple redundancyimproved the hardware reliability significantly. FM353, served as the stepper controlmodule in Siemens PLC, was connected with the stepper motor driver in CRDM andimplemented the regular motion function of the control rod in several working modes.FM350, the counter module, was connected with multiple position sensors, and then captured the position, velocity and acceleration information of the control rod. Both ofthe two modules were designed ET200M distributed I/O station.The PLC software of RCRPs was designed and implemented by using theSiemens Step7toolskits. With regular manipulation of the CPU operating system, theprogram design of redundant CPUs was the same as the single CPU system, becausethe synchronization update of main programs was controlled and monitored byoperating system. There were three main parts of program in rod control system: therealization of multiple working modes of FM353, the exchange of control commandsand feedback information between rod control system and remote EPICS IOC controlterminal, and the status surveillance and error management of the whole rod controlsystem.In the ABB PLC system, the hardware configuration has higher redundancycompared with Siemens hardware configuration in CPU level. The redundant CPUswere constructed by Several AC800M modules, and then connected with redundantPROFIBUS DP distributed slave station. The power supply was also redundant. Themodule CD522, with the function of controller and counter, was researched and usedin ABB PLC system to fulfill the functionalities of rod control and rod positionfeedback.Reliability is of the most importance in reactor engineering design. In this paper,the hardware system reliability analysis of RCRPs in control rod experimental testbedwas studied after investigation of the reliability engineering. This brought a way tocalculate the degree of reliability and failure rate of hardware system in TMSR.In the last part of this paper, simulation research of PCS based on the RCRPs andCRDM in control rod experimental testbed was conducted, and the simulationparameters were deduced. It is expected that those parameters can be used in theimplementation of power control system prototype in the near future. |
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