Nuclear power plants. Instrumentation and control systems important to safety. Software aspects for computer-based systems performing category A functions
Nuclear power plants. Instrumentation and control systems important to safety. Software aspects for computer-based systems performing category A functions
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1 Scope and object This International Standard provides requirements for the software of computer -based I&C systems of nuclear power plants performing functions of safety category A as defined by IEC 61226. According to the definition in IEC 61513, I&C systems of safety class 1 are basically intended to support category A functions, but may also support functions of lower categories. However the system requirements are always determined by the functions of the highest category implemented. For software of I&C system performing only category B and C functions in NPP as defined by IEC 61226, requirements and guidance of IEC 62138 are applicable. This standard provides requirements for the purpose of achieving highly reliable software . It addresses each stage of software generation and documentation, including requirements specification , design, implementation, verification , validation and operation. The principles applied in developing these requirements include:
– best available practices;
– top-down design methods;
– modularity;
– verification of each pha...
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