Abstract
The reliable operation of the digital I&C system of nuclear power plants is of great significance to nuclear safety, but there is no industry-recognized method for evaluating and improving software reliability. This paper proposes a method which is depend on software reliability growth model, to calculate software reliability. At first this paper analyzes the cause and mechanism of software failure,then demonstrates how to descript software reliability mathematically. The second part of this paper explains two way to reduce software failures: fault-tolerant design and error-avoidance design. Furthermore, the third part proposes a software reliability assessment and improvement method based on the reliability growth model, which is used for the digital I&C system of nuclear power plants.
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