Dynamic Modeling of a Closed Cycle Gas Turbine CHP Plant With a Nuclear Heat Source

The High Temperature Gas-cooled Reactor is a promising concept for inherently safe nuclear power generation. This paper deals with dynamic modeling of the energy conversion system of a combined heat and power plant, based on a helium cooled reactor in combination with a closed cycle gas turbine system. The model will be used to design and test a control system and to analyze transients following incidents. A one-dimensional flow model describing the helium flow and the two-phase water flow is used through the whole plant, with different source terms in different pieces of equipment. A stage-by-stage model is produced for the radial compressor and axial turbine. Other models include the recuperator, water/helium heat exchangers a natural convection evaporator, valves, etc. With this model, open-loop responses from controlled parameters (shaft speed, temperatures and pressures) on changes of reactor power, valve-positions etc. have been established.