Generate Hazard log item for Hazard "KERNEL-6 Manage communication session failure" (Analyse and Evaluate Risk for Hazard)

[janWelte]

Subtask of #70
Generate Hazard log item for Hazard
KERNEL-6 Manage communication session failure
(Related to model of Subset 26 §3.5.3 Establishing a communication session)"KERNEL-6 Manage communication session failure"

Work scope:

System structure breackdown:

• Analyse Subset 26 input (and additional)
• Identify main components at system level and limits

System functional breackdown:

• Identify main functions at system level
• Identify lower level kernel functions (based on the benchmark model)
  • Synchronising understanding with the author of the model
  • pre-release draft results to https://github.com/openETCS/validation/tree/master/SafetyCase
• Compare work of Subset 88 & 91 to functional breakdown - Complete discription of the hazard in relation to it source (System FMEA in Subset 91 Annex A)
• Top down analysis to identify corresponding exidents
• Assessment for risk of Hazard