LAST – a Library And Stochastic Transport tool

\nA new stochastic particle transport tool named LAST has been developed to allow seamless integral data assimilation on nuclear reaction model parameters during the evaluation process of nuclear data. The present work demonstrates its capability to perform actuate once-through information propagation from pre-processed application library to integral multiplication factor. Exact perturbation on reactivity is the starting point of the integral feedback on nuclear reaction model parameters. Its implementation in LAST is also shown.\n