Source: Engineer for Safety Limited ( Phil Williams)
The section focusses on probability as an attribute from FTA elements.
This is arguably the least important attribute from FTA, particularly in system modeling and given the simplistic treatment of probability in this section.
A far more valuable attribute from FTA is the cut set, or minimal cut set at any gate within the FTA hierarchy.
This is a major shortfall that I believes renders the use of these profiles within system modeling very limited, particularly in early system work before the base event probabilities can be known. Even in later lifecycle phases, the simplistic treatment of probabilities that ignores real world interdependence renders the results from such modeling misleading at best.
Reported: RAAML 1.0b1 — Fri, 30 Apr 2021 10:41 GMT
Disposition: Deferred — RAAML 1.0
RAAML provides sufficient information to calculate cut sets
Operations such as calculation of cut sets are meant to be implemented by tool vendors. The RAAML specification needs to provide enough data for these operations to be able to return results. Current version of the RAAML specification provides enough data for that. That was demonstrated in the pilot implementation by export to the R fault tree package contained in CRAN R repository by means of the generic tables provided in Cameo Systems Modeler.
Updated: Thu, 31 Mar 2022 19:32 GMT
RAAML — Lack of consideration of Cut Sets
- Key: RAAML-44
- OMG Task Force: Risk Analysis and Assessment Modeling Language (RAAML) 1.0 FTF