Forced propagation method for Monte Carlo fission source convergence acceleration in the RMC

• 来源期刊: 核技术（英文版）
• 年，卷（期）: 2021,（3）
• 所属期刊栏目: NUCLEAR ENERGY SCIENCE AND ENGINEERING
• 页码范围: 52-62
• 页数: 11页
• 语种: 英文

摘要

In loosely coupled or large-scale problems with high dominance ratios, slow fission source convergence can take extremely long time, reducing Monte Carlo (MC) criticality calculation efficiency. Although various accel-eration methods have been developed, some methods cannot reduce convergence times, whereas others have been limited to specific problem geometries. In this study, a new fission source convergence acceleration (FSCA) method, the forced propagation (FP) method, has been proposed, which forces the fission source to propagate and accelerate fission source convergence. Additionally, some stabilization techniques have been designed to render the method more practical. The resulting stabilized method was then successfully implemented in the MC transport code, and its feasibility and effectiveness were tested using the modified OECD/NEA, one-dimensional slab bench-mark, and the Hoogenboom full-core problem. The com-parison results showed that the FP method was able to achieve efficient FSCA.