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Regional Basic Professional Training Course in Korea

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<strong>Regional</strong> <strong>Basic</strong> <strong>Professional</strong> <strong>Tra<strong>in</strong><strong>in</strong>g</strong> <strong>Course</strong> (BPTC) on Nuclear Safety<br />

11.4. HUMAN RELIABILITY ANALYSIS:<br />

CONCEPTS AND TECHNIQUES<br />

Human reliability is related to the field of human factors eng<strong>in</strong>eer<strong>in</strong>g, and refers to the<br />

reliability of humans <strong>in</strong> fields such as manufactur<strong>in</strong>g, transportation, the military, or<br />

medic<strong>in</strong>e. Human performance can be affected by many factors such as age, circadian<br />

rhythms, state of m<strong>in</strong>d, physical health, attitude, emotions, propensity for certa<strong>in</strong><br />

common mistakes, errors and cognitive biases, etc.<br />

Human reliability is very important due to the contributions of humans to the resilience of<br />

systems and to possible adverse consequences of human errors or oversights, especially<br />

when the human is a crucial part of the large socio‐technical systems as is common today.<br />

User‐centered design and error‐tolerant design are just two of many terms used to<br />

describe efforts to make technology better suited to operation by humans<br />

Especially, operat<strong>in</strong>g crews play a major role <strong>in</strong> handl<strong>in</strong>g a NPP after an <strong>in</strong>itiat<strong>in</strong>g event.<br />

Indeed, if most safety systems start up automatically <strong>in</strong> such situations, restor<strong>in</strong>g or<br />

ma<strong>in</strong>ta<strong>in</strong><strong>in</strong>g safety functions also requires other actions that rely on the operat<strong>in</strong>g crew.<br />

The purpose of HRA is twofold; it consists of both identify<strong>in</strong>g the HF missions that<br />

should be modeled <strong>in</strong> any safety analysis, as well as analysis of these missions from a<br />

qualitative and quantitative po<strong>in</strong>t of view. The first objective is closely related to PSA or<br />

functional analysis, whereas the second one is more specifically a human reliability issue.<br />

However, at this po<strong>in</strong>t <strong>in</strong> time, there is still no “standard” HRA method upon which<br />

everybody agrees.<br />

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