Challenge

SPTC requires additional guidance regarding Functional Safety and, in particular, how and when to apply functional safety to existing requirements & acceptance processes.

Approach

To compliment the overall System Safety Risk Management Process, RED are developing a detailed process, including guidance and templates, for functional safety assessments considering both software and hardware functions for SPTC DT (see below). Functional Safety is the aspect of System Safety which is dependent on the correct functioning of safety-related systems. Whilst physical safety hazards are often already present in the system, functional safety hazards usually require an initiating event (e.g., a failure or an operator error) to put the system from a safe to a hazardous condition.

Outputs

The document provides guidance for the identification of functional safety requirements, acceptance activities, and Test & Evaluation methods which may be used to assess and assure achievement of functional safety requirements. The guidance also highlights the related policy and legislation considering (Software with Unknown Pedigree [SOUP]).