ON THE USE OF MONTE-CARLO PERTURBATION IN NEUTRON-TRANSPORT PROBLEMS

We recall the principles of two methods to estimate the variations on the collision density between different configurations: the 'multiple estimate method' and the 'Taylor expansion method'. With regard to the second method, we provide the algorithms and the useful equations to estimate an arbitrary order of the Taylor expansion for one and two va riables. Several examples bring to light the advantages and drawbacks of the 'multiple estimate method' and the 'Taylor expansion method'. ( C) 1998 Elsevier Science Ltd. All rights reserved.