Operating Experience - Computer-Based I&C Systems Vol 2

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Additional info for Operating Experience - Computer-Based I&C Systems Vol 2 (csni-r2002-1-vol2)

Example text

As the development part and the analysis part for application software produced by software of category “indirect 2” is strongly human-centered, the probability that a fault in the tool results in a fault in the application software is much lower than with category “indirect 1”. Therefore this type of software is treated as non-classified NC. Also the verification and validation tools which are used by the analyst, like static analyzers and debuggers are categorized as NC. Their application is primarily human driven, and a tool fault is not likely to introduce a fault in the application software.

A drawback is the sensitivity to software common mode failure and more generally to design common mode failure. 40 NEA/CSNI/R(2002)1/VOL2 S P Conditioning PU INS1 P Conditioning PU INP5 Protective signals to CPR train A & B Cabinet L1 I PU INI3 PU INP7 Protective signals to CPR train A & B Cabinet L2 S P I P Conditioning Conditioning Reactivity unit Monitoring unit PU INS2 Protective signals PU INP6 PU INI4 PU INP8 Protective signals Protective signals Protective signals To control room Cabinet L3 S : source sensors I : intermediate sensors P : power sensors PU : processing unit INS1, INS2 : 2 identical source units INI3, INI4 : 2 identical intermediate units INP5, …, INP8 : 4 identical power units To control room Cabinet L4 figure 1 : Tihange 1 NIS architecture The Tihange 1 NIS software Each 1E classified processing unit is composed of standard SPINLINE3 hardware, the standard Operational System Software, parameterized according to the Source, Intermediate or Power Input/output requirements, and a dedicated application software.

A component is supposed to fail, due to some reason as wearing, aging or unanticipated stress. The analysis may not always be easy, but at least, the safety engineer can rely on data provided by the component manufacturer, results of tests and feedback of experience when available. When performing an FMEA on software, very few information or support is available. : - to find out the appropriate starting point for the analyses, - to set up a list of relevant failure modes, - to understand what makes those failure modes possible or unlikely (the causes) and what are the consequences.

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