Investigation of Hydrogen Diffusion and Deposition Behavior of Spiral Fuel in Pressurized Water Reactors
摘要
Spiral fuel, characterized by a larger heat transfer area, shorter path, and self-positioning, is deemed crucial for advanced pressurized water reactors (PWRs). Its increased surface area, though beneficial for heat exchange, may lead to intensified oxidation and hydrogen diffusion on the cladding’s outer surface over long-term operation compared to traditional fuels. Investigating these phenomena is essential for ensuring fuel integrity. This study adapts a corrosion model specifically designed for spiral fuel, focusing on hydrogen diffusion and deposition. Based on its structural and material properties, a set of effective corrosion calculation models were developed. These models were then integrated into the MOOSE platform to enhance the BISON program, which simulates nuclear fuel performance. Validation was achieved using experimental data and BISON results, confirming the accuracy of the oxide corrosion module and hydrogen-related models. The analysis explored oxidation, hydrogen diffusion, thermal conduction, and mechanical behavior under varying power levels and assumed heat transfer coefficients. Results show that despite improved convective heat transfer and dispersed hydrogen distribution within the fuel, hydrogen deposition remains a concern at the blade tip, potentially becoming a critical area. This research provides valuable insights into the challenges and benefits associated with spiral fuel in PWRs, guiding future design and operational considerations.