Designers of safety systems have the task of finding ways to prevent failures that can cause, for example, loss of life, loss of money, environmental destruction, operational degradation, organizational impacts, or political loss. We have developed a structured approach to safety system design that is based on a safety theme describing how safety principles can be coordinated in a synergistic combination built around a small core of safetyp-critical components. The use of principles and the use of a core of components help ease the analytical burden and makes analysis more readily assured to be meaningful. We have successfully applied this approach to the U.S. nuclear weapons safety program, and we believe that it has much wider applicability for safety systems in general.
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