Design of safety-critical systems using the complementarities of success and failure domains with a case study

作者：Ahmed Rizwan; Koo June Mo; Jeong Yong Hoon; Heo Gyunyoung^*

来源：Reliability Engineering & System Safety, 2011, 96(1): 201-209.

DOI：10.1016/j.ress.2010.09.008

• Safety-critical system
• Axiomatic Design
• Fault Tree Analysis
• TRIZ
• Success domain
• Failure domain
• Complementarities

A safety-critical system has to qualify the performance-related requirements and the safety-related requirements simultaneously. Conceptually, design processes should consider both of them simultaneously but the practices do not and/or cannot follow such a theoretical approach due to the limitation of design resources. From our experience, we found that safety-related functions must be simultaneously resolved with the development of performance-related functions, particularly, in case of safety-critical systems. Since, success and failure domain analyses are essential for the investigation of performance-related and safety-related requirements, respectively, we articulated our perception to Axiomatic Design (AD), Fault Tree Analysis (ETA), and TRIZ. A design evolution procedure considering feedbacks from AD to identify functional couplings, TRIZ methodology to explore uncoupling solutions and FTA to improve reliability in a systematic way is presented here. A case study regarding design of safety injection tank installed in a nuclear power plant is also included to illustrate the proposed framework. It is expected that several iterations between AD-TRIZ-FTA would result into an optimized design which could be tested against the desired performance and safety criteria.

• 出版日期2011-1