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Research on the evaluation model of the software reliability for nuclear safety class digital instrumentation and control system   CHI Miao1, and YANG Ming2   1. School of Economics & Management, Harbin Engineering University, 150001, P.R.China (chimiao@hrbeu.edu.cn) 2. College of Nuclear Science & Technology, Harbin Engineering University, 150001, P.R.China   Abstract: The method of evaluating software reliability (SR) of nuclear safety class digital instrumentation and control system (I&C) is investigated by reviewing international software design standards in order to build up the framework of the relevant standards. As the result of review of the NRC NUREG-0800 requirements it is first found out that the Digital I&C software standards should follow Standard Review Plan for the Review of Safety Analysis Reports for Nuclear Power Plants (NUREG-0800 BTP7-14). Secondly, the quantitative evaluation models of SR should be constituted by using Bayesian Belief Network (BBN) to establish thirteen sub-model frameworks. Thirdly, each sub-models and the weight of corresponding indexes in the evaluation model are analyzed based on BBN. Finally the safety case was introduced. The reduced models are expected to lay a foundation for review and quantitative evaluation on the SR in nuclear safety class digital I&C. Key words: safety class digital I&C system; software reliability; technical standard; Bayesian Belief Network
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