Present and Future Aspects of PROSA: A Computer Program for Near Real Time Accountancy

The methods of near real time accountancy (NRTA) for safeguarding nuclear material received a lot of attention in the last years. We developed PROSA 1.0 as a computer program to evaluate a sequence of material balance data based on three statistical tests for a selected false alarm probability. A new NRTA test procedure will be included and an option for the calculation of detection probabilities of hypothetical loss patterns will be made available in future releases of PROSA. Under a non-loss assumption, PROSA may also be used for the analysis of facility measurement models.