  This paper presents a new approach to the solution of Probabilistic Risk
Assessment (PRA) models using the combination of Reinforcement Learning (RL)
and Graph Neural Networks (GNNs). The paper introduces and demonstrates the
concept using one of the most popular PRA models - Fault Trees. This paper's
original idea is to apply RL algorithms to solve a PRA model represented with a
graph model. Given enough training data, or through RL, such an approach helps
train generic PRA solvers that can optimize and partially substitute classical
PRA solvers that are based on existing formal methods. Such an approach helps
to solve the problem of the fast-growing complexity of PRA models of modern
technical systems.
