This study proposes a novel integrated system combining solar photovoltaic (PV) and nuclear energy, using a 100 MW small nuclear reactor as the research focus. In this system, photovoltaic power generation serves as the energy source for an electric heater, which reheats the steam produced by the nuclear reactor. This process enhances the steam inlet parameters of the turbine. Additionally, a molten salt thermal storage system is incorporated to stabilize the output of the integrated system. A combined operational model of solar photovoltaic and nuclear energy is developed, and key performance indicators such as total power generation, efficiency, and return on investment are compared. The results demonstrate that the proposed system can significantly improve the power generation efficiency of small nuclear reactors, achieving an overall efficiency comparable to traditional thermal power plants. Furthermore, the integration of molten salt storage enhances the stability of photovoltaic generation, contributing to the consumption of renewable energy. Unlike other power generation methods, the combined PV and small nuclear reactor system faces no geographical or environmental restrictions, offering promising application prospects.