Fault tolerance has been an essential architectural attribute for achieving high reliability in many critical applications of nuclear systems. This paper addresses the design issue for the optimal number of spare units in a triple-modular-redundancy system with spare units, including fault coverage and common-cause failure. Two aspects of the problem are shown: 1) How to minimize the average total system cost, and how to minimize the average total system cost subject to an acceptance designed reliability level. 2) How to maximize the system reliability with imperfect coverage, including common-cause failures. Application and numerical examples illustrate the results.
All Science Journal Classification (ASJC) codes
- Safety, Risk, Reliability and Quality
- Electrical and Electronic Engineering
- Common-cause failure
- Design policy
- Optimal redundancy