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18.4.2005 61508-työryhmä Automaatiojärjestelmien kelpoistaminen – ohjelmistot. ( Turvallisuuskriittisten ohjelmoitavien automaatiosovellusten kelpoistamisesta)

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Presentation on theme: "18.4.2005 61508-työryhmä Automaatiojärjestelmien kelpoistaminen – ohjelmistot. ( Turvallisuuskriittisten ohjelmoitavien automaatiosovellusten kelpoistamisesta)"— Presentation transcript:

1 työryhmä Automaatiojärjestelmien kelpoistaminen – ohjelmistot. ( Turvallisuuskriittisten ohjelmoitavien automaatiosovellusten kelpoistamisesta) Pentti Haapanen

2 työryhmä STUK-YTO-TR 202 Haapanen P, Helminen A, Pulkkinen U. Quantitative reliability assessment in the safety case of computer-based automation systems. STUK, Helsinki STUK-YTO-TR 198 Helminen A, Pulkkinen U. Reliability assessment using Bayesian network. Case study on quantative estimation of a software-based motor protection relay. STUK, Helsinki STUK-YTO-TR 171 Haapanen P, Korhonen J, Pulkkinen U. Licensing process for safety-critical software-based systems. STUK, Helsinki STUK-YTO-TR 119 Korhonen J, Pulkkinen U, Haapanen P. Statistical reliablity assessment of software-based systems. STUK, Helsinki 1997

3 työryhmä IEC TC 45 Nuclear Instrumentation SC 45A Instrumentation and control of nuclear facilities IEC ( ) Software for computers in the safety systems of nuclear power stations IEC ( ) Software for computers important to safety for nuclear power plants - Part 2: Software aspects of defence against common cause failures, use of software tools and of pre-developed software IEC ( ) Nuclear power plants - Instrumentation and control for systems important to safety - General requirements for systems IEC Ed. 2.0 (CDV, ) I&C systems important to safety - Software aspects for computer based systems performing category A functions IEC ( ) Nuclear power plants - Instrumentation and control systems important to safety - Classification of instrumentation and control functions

4 työryhmä Alustat/laitteet Kiinteästi ohjelmoidut Parametroitavat Konfiguroitavat Vapaasti ohjelmoitavat

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6 työryhmä C5) Suppliers are quoting that their products conform to IEC for a specific safety integrity level. Does this mean that using these products is sufficient for me to comply with IEC 61508? No. A safety integrity level is not directly applicable to individual subsystems or components. It applies to a safety function carried out by the E/E/PE safety-related system. IEC covers all components of the E/E/PE safety-related system, including field equipment and specific project application logic. All these subsystems and components, when combined to implement the safety function (or functions), are required to meet the safety integrity level target of the relevant functions. Any design using supplied subsystems and components that are all quoted as suitable for the required safety integrity level target of the relevant functions will not necessarily comply with the requirements for that safety integrity level target. A simple example is when the subsystem or component is incorrectly installed. Important factors to be quoted by the supplier are the rate of unrevealed (i.e. not detected by the on-line diagnostic tests) dangerous failures and the diagnostic test interval (needed to ensure that a safe reaction to revealed dangerous failures can be achieved quickly enough). IEC 61508: Frequently Asked Questions

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