Module 4: Introduction To Human Reliability Ana... Apr 2026

Direct actions that trigger a system trip or accident sequence.

In HRA, human actions are typically categorized by when they occur in relation to a system disturbance:

Human Reliability Analysis is a structured, engineering-based discipline used to identify, model, and quantify potential human failure events (). While hardware components are often considered stable until a failure occurs, human performance is inherently dynamic, adaptive, and influenced by a variety of internal and external factors . Module 4: Introduction to Human Reliability Ana...

Critical responses or recovery actions taken by operators after an initiating event has occurred. 3. The HRA Process Workflow

A standard HRA follows a systematic sequence to ensure all critical interactions are accounted for: Introduction to Human Reliability Analysis (HRA) Direct actions that trigger a system trip or

The primary objective of HRA is to evaluate the human contribution to overall system reliability and estimate the —the numerical likelihood that a specific task will result in error. 2. Core Components and Classifications

Latent errors committed during maintenance, testing, or calibration that leave a system in an unavailable state before an event occurs. Critical responses or recovery actions taken by operators

This write-up for covers the core principles, methodologies, and industrial applications of the discipline. 1. Overview of Human Reliability Analysis (HRA)