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Nuclear power plants. Instrumentation and control systems important to safety. Software aspects for computer-based systems performing category A functions Ingestion-build-205840 “This standardThis 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 phase Clear documentation Auditable documents