System Safety Hazard Analysis (SSHA) and Related Concepts

These flashcards provide definitions and explanations of key concepts related to System Safety Hazard Analysis (SSHA), hazard identification processes, and related analysis methods.

SSHA

System Safety Hazard Analysis, a detailed design phase to identify root causes and influence system design with minimal cost impact.

PHA

Preliminary Hazard Analysis, identifies hazards and risks during early design phases.

TLM

Top Level Mitigation, a categorization of hazards within the system.

SCF

Safety Critical Functions, functions within a system that are crucial for safety.

FTA

Fault Tree Analysis, a top-down systematic method for determining root causes and probabilities of undesired events.

HAZOP

Hazard and Operability Analysis, a systematic approach used to identify process hazards and inefficiencies in a system.

Cut Set

An event set of basic events that cause a top undesired event to occur.

Minimal Cut Set

A cut set reduced to the minimum number of events that still ensures the top undesired event occurs.

Critical Path

The highest probability cut set that determines the probability of a top undesired event.

Event Tree Analysis (ETA)

Evaluates potential mishap outcomes that can follow an initiating event, using a forward-thinking process.

Risk Achievement Worth (RAW)

Evaluates the increase in the top event probability if a given event occurs, guiding where to focus prevention efforts.

Human-System Interface (HSI)

The relationship between humans and their environment within system design.

Operational Hazard Checklist

A list used to identify hazards related to operational tasks and environments.

Common Mode Failures

Failures that occur simultaneously in two or more components due to a shared cause.

Random Common Cause Failure Analysis (CCFA)

A technique for identifying and analyzing failures that arise from common causes in systems.