抄録
In an asymmetric loosely-coupled problem, the dominance ratio is very close to unity and it requires a large number of generations for conventional Monte Carlo power iteration method. Since a small number of histories per generation induce biased fission source distribution, huge computational burden is indispensable. For such problems, the Monte Carlo anchoring method provides speedup of fission source convergence. In the Monte Carlo anchoring method, the fission source term is decomposed into a conventional fission distribution and an anchoring distribution with anchoring facor α. The anchoring distribution is updated by a deterministic acceleration method and it minimizes the biasing effect owing to a potentially inaccurate deterministic solution. Numerical tests are performed on asymmetric loosely-coupled two-group rod problems.
