Guidance for Addressing Software Common cause Failure In High Safety-Significant Safety Related Digital I&c systems


Associated First Principles of Protection Against Software CCF



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Associated First Principles of Protection Against Software CCF
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First Principle 6.1 - Software quality depends on complete and correct requirements, design and implementation
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First Principle 6.4 - Operating history can provide evidence of software quality
9.1.3
Safe Design Objectives
Safe design objectives for achieving platform software requirements quality are listed below The platform software, including user programmable integrated circuits (such as FPGA,
CPLD, ASIC, etc, meets or exceed a systematic capability of SC (as fora SIL 3 system) as
DRAFT B - August 2020
© NEI 2020. All rights reserved. nei.org 15 described in IEC Std. 61508-3. If a platform does not have SC certification, the assurance case should demonstrate how the platform meets the SIL 3 criteria in IEC 61508-3.

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