JFN has safety case authors with extensive experience in developing safety cases for the nuclear sector. Safety cases can be generated for presentation in either a textual or graphical format. The textual format is the traditional format for safety case with written arguments supported by documentary evidence. Graphical formats are a recent development using a graphical layout to break complex arguments down. This approach gives greater depth to the arguments and gives a visual support to the presentation of the evidence. JFN has experience of using both Safety Argument Manager (SAM) and Goal Structured Notation (GSN) software.
As part of the development of a safety case, JFN deploys a range of analytical tools to support the arguments developed and present the supporting evidence in a structured format. These tools include Functional Safety Assessments (FSA), Failure Mode Effects Analysis (FMEA), Failure Mode Effects and Criticality Analysis (FMECA), Failure Mode Effects and Diagnostic Analysis (FMEDA), Fault Tree Analysis, SIL Deterministic Studies, Reliability Block Diagrams (RBD) and Reliability and Availability Analysis (RAA).