A Scenario-based Safety Argumentation For
CBTC Safety Case Architecture
Author(s)
C. Liu, X. Sha, F. Yan & T. Tang
Abstract
The Communication based Train Control System (CBTC), as a symbol that
China has stepped into the stage of rapid urban rail traffic development, is a
safety-critical system that guarantees rail traffic safe-operating and high
transportation efficiency. The safety case for the CBTC generic product is an
essential justification document to prove the system can be accepted as
adequately safe. To extract safety requirements implicitly illuminated within the
system requirement specification, operational scenarios are widely used to depict
the behaviours and interactions of subsystems and components, which becomes a
challenge when constructing safety case architecture from the aspect of system
function. This paper presents a promising method based on Goal Structuring
Notation (GSN) to establish a composition of safety argumentations for
managing safety cases. The method introduces the concept of safety argument
modules to express rationally encapsulated goal-based safety claim sets that
conform to safety requirements, but are deduced in accordance with hazard
analysis based on the operational scenarios. An example generic modular safety
case architecture for CBTC generic products is presented to illustrate how the
whole safety case architecture is structured to be in line with system
requirements, and the ease with which module updates and reuse, according to
revises for system development, can be performed.
Keywords: CBTC, GSN, safety case, safety argument module.
Keywords
CBTC, GSN, safety case, safety argument module
Related Book
Other papers in this volume
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