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Defense in depth concept for nuclear safety, functional modeling method and software reliability issues YOSHIKAWA Hidekazu1
1. College of Nuclear Science and Technology, Harbin Engineering University, 150001, Harbin, Heilongjiang, China (yosikawa@kib.biglobe.ne.jp)
Abstract: An overview is made on the software reliability issue which comes from safety concern on computer application for instrumentation and control (I&C) and human-machine interface technology (HMIT) of safety-critical systems of nuclear power plant (NPP). The discussion starts from the deepening defense in depth (Did) concept with the historical repetition of severe accidents and the resultant strengthened regulatory requirements to the design and evaluation of the digital I&C and HMIT. A new functional modeling approach is proposed so that it can serve to analyze various aspects of software reliability issues for the NPP well balanced in safety, economy, and efficiency.
Keyword: software reliability; digital I&C and HMIT; defense in depth; functional modeling approach |
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