Research on MCNP Bootstrapping Calculation Method

Monte Carlo method lacks accuracy,or even fails to get a result when dealing with compli-cated models or cases with very low possibility.At this time we may consider dividing the model into several parts（bootstrapping） and calculate the problem in separate steps.In this paper,the application of bootstrap-ping is discussed,including recording surface source,selecting boundary geometry.A few bootstrapping ex-amples show that the best estimated results can be obtained using SSW/SSR card and reflective/vacant boundary.