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

First Principle 6.1 - Software quality depends on complete and correct requirements, design and implementation

First Principle 6.2 - Concurrent triggering conditions are required to activate a latent software defect

First Principle 6.3 - The effects of a software CCF can be reduced by design

DRAFT B - August 2020
© NEI 2020. All rights reserved. nei.org 22
10.5.3
Safe Design Objectives
Safe design objectives for achieving application software detailed design and development quality are listed below
10.5.3.1
Information items that describe application software requirements, architecture design, and validation planning are completed prior to application software detailed design and implementation activities and are used to inform the detailed design and its implementation.
10.5.3.2
The application software is modular, testable, and modifiable.
10.5.3.3
For each major element or subsystem identified in the application software architecture design produced via the SDOs provided in Section 10.2.3, further refinement into application software modules is based on partitioning, and modules are designed insets suitable for integration and integration testing at the software and system levels.
10.5.3.4
Application software integration tests and software/hardware integration tests ensure conformance to the requirements produced under the SDOs in Section 10.1.

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