Two fallback sites appear independent but receive power through the same substation. Flooding or a technical failure could affect both. Examine shared dependencies and compare ways to address them. Use your analysis for further work on the service in your organisation.
Describe a critical service, its resources and the conditions for reduced operation. Develop different hazard scenarios and trace how one failure can cause others. For the case, compare protecting the shared bottleneck, obtaining a separate power supply and operating at reduced capacity; revise the sequence of measures when another failure occurs.
Take away your completed all-hazards analysis for use in your organisation. The method can be used internationally; applicable operator duties require separate assessment.
What you will work on
Define a critical service, its recipients, dependencies and consequences of disruption
Assess different hazard scenarios and cascading effects while making assumptions and uncertainty explicit
Incorporate a second failure into an existing cascade
Who it is for
Managers responsible for critical services and operations
Operational risk managers
Resilience and continuity managers
Topics
Service boundaries, recipients and minimum service
Natural, technical, human-organisational and intentional hazards
Common causes and cascading failures
Data quality and assessment assumptions
Effectiveness and prioritisation of measures
Your result
Your all-hazards analysis describes resources, scenarios, cascades and shared bottlenecks. Use the sequence of measures in further work on the service.
Prerequisites
Knowledge of an operational service and its main resources. You need a description of the service and information about its resources and dependencies. Alternatively, use the supplied operator case study.
Format and approach
Planned: five to six hours of self-study with scenario work and self-checks with explanations.
During a power outage, a water service needs a contractor's mobile pumps. The contractor also serves other customers and needs water for its own operations. Determine what minimum service remains possible under those conditions.
Use a disruption scenario to assess whether a critical service could resume within its agreed tolerance. Consider when work actually resumes as well as when the system returns.
In the course case, heavy rain cuts a site’s electricity supply while the building remains intact. Compare protection measures and backup power, then develop a procedure for maintaining the service.