Product
The hazard management process is a fundamental element of safety certification, and one that presents significant challenges. Hazards may be present due to the primary mission and operation of the system, its design, maintenance or decommissioning.
The basic function of a Hazard Tracking System (HTS) is to log each identified hazard and track its progress through analysis, risk assessment, mitigation, verification and acceptance. Today’s systems are increasingly large and complex as microprocessors and other logic devices are used to implement many functions. Correct implementation of their applications and their correct interoperability is fundamental to ensure the safety of the public and the environment.
Such safety-critical systems are often parts of a larger System-of-Systems that involves development teams from several organizations. The integration of a System-of-Systems program needs to be well coordinated to ensure that mitigations of hazards are developed without conflict and without omission. As changes are integrated into the system the HTS is updated, impacts on safety risk and mission capability must be assessed and communicated to the project team. New hazards can be raised throughout the project lifecycle, and can have a cascading effect on earlier design decisions.
Managing a HTS that integrates systems from multiple organizations, each with its own safety culture and concept of system safety, is a demanding job. There are numerous reviews and iterations prior to achieving approval of the final safety case. The Hazard Tracking System is an essential tool that supports safety certification. The basic function of a HTS is to log each identified hazard and track its progress through analysis, risk assessment, mitigation, verification and acceptance. Hazard management progress reports, the HTS and its data may need to be accessible to the owner, regulators, and independent assessors.
Uni-TWorld simplifies the hazard analysis process increases system acceptance confidence, reduce program risk, and lower development costs.
Hazard Tracking System / Hazard Management System (based on MIL-STD-882E Task 106)
Uni-TWorld facilitates the analysis, integration and completion of the hazard analysis tasks below within the same platform:
- Preliminary Hazard List (PHL) – Task 201
- Preliminary Hazard Analysis (PHA) – Task 202
- Subsystem Hazard Analysis (SSHA) – Task 204
- System Hazard Analysis (SHA) / Interface Hazard (SHA) – Task 205
- System Of Systems (SoS) – Task 209
- Management of Safety related Validation and Verification (V&V) artifacts – Task 401
- Hazard mitigations defined as technical requirements
- Capable of importing technical safety related requirements from requirements management tools such as DOORS, Requisite Pro, SLATE, etc.
- Exports Derived Safety requirements (for addition to technical specifications)
- Tracks complete System Safety Engineering Artifacts (from supplier hazard analysis to System hazard analysis to System of Systems).
- Automated hazard mitigation and verification review between functional groups e.g., System Safety Engineers, Systems engineering staff including program management.
- Generates System Safety Engineering Key Performance Indicators upon request.
- Report Generation for output to the Safety Assessment Report / Hazard Log / Safety Case.
Modules
To prevent hazard analysis duplication and overlap and ensure mishap hazard analysis traceability Uni-TWorld is structured into independent modules. These modules are consistent with MIL-STD-882E tasks as described below.
Subsystem Hazard Analysis – SSHA – Task 204
It is used to identify previously unknown hazards associated with the subsystems design, including component failure modes, critical human error inputs, and hazards resulting from functional relationships between the components and equipment comprising each Subsystem.
System Hazard Analysis – SHA Task 205
Evaluates the interface between subsystems. The focus is placed on interactions of subsystems operating as a whole including operators. The SHA expands on the subsystem hazard analysis (SSHA) or inputs from fault tree analysis (FTA), to assess the causal factors of hazards at the system level.
System-of-Systems Hazard Analysis – SoS – Task 209
System of systems consists of one or more Interfacing Systems and the Environment. Each system of systems configuration has its own hazard space when in steady state operation. The transfer between states introduces new hazards that do not belong to either system of systems hazard space.
Safety (Hazard Mitigation) Verification - Task 401
Definition of tests, demonstrations or use other verification methods on safety-significant hardware, software, and procedures to verify compliance with safety requirements.