The tutorial provides a historical overview of key considerations that have shaped modern nuclear weapon safety philosophy and, in turn, weapon safety architectures. Key considerations include the concept of a ?wooden? bomb, insights gained from weapon accidents, the introduction of standardized probabilistic safety requirements, and the development of the simplifying concept of assured safety implemented using the nuclear safety design principles of isolation, incompatibility, and inoperability. The decision framework used to assert that requirements are met and the technical evidence needed to support these assertions are also discussed.
