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Risk is the lack of certainty about the outcome of making a particular choice. Statistically, the level of downside risk can be calculated as the product of the probability that harm occurs (e.g., that an accident happens) multiplied by the severity of that harm (i.e., the average amount of harm or more conservatively the maximum credible amount of harm).
One study found that the INES scale of the IAEA is highly inconsistent, and the scores provided by the IAEA incomplete, with many events not having an INES rating. Further, the actual accident damage values do not reflect the INES scores. A quantifiable, continuous scale might be preferable to the INES. [44]
The NRC established a classification scale for nuclear power plant events to ensure consistency in the communications and emergency response. Unusual Event—This is the lowest of the four emergency classifications. This classification indicates that a small problem has occurred.
Software criticality levels range from A to E, corresponding to the severity of Catastrophic to No Safety Effect. Higher levels of rigor are required for level A and B software and corresponding functional tasks and work products is the system safety domain are used as objective evidence of meeting safety criteria and requirements. [citation ...
Global catastrophic risk – Hypothetical global-scale disaster risk; Hazard – Situation or object that can cause harm; Hazard analysis – Method for assessing risk; Hazard analysis and critical control points (HACCP) – Systematic preventive approach to food safety risk assessment in food
A clean-up crew working to remove radioactive contamination after the Three Mile Island accident.. Nuclear safety is defined by the International Atomic Energy Agency (IAEA) as "The achievement of proper operating conditions, prevention of accidents or mitigation of accident consequences, resulting in protection of workers, the public and the environment from undue radiation hazards".
A hazard pictogram to indicate a hazard from a flammable substance.. A hazard is a potential source of harm.Substances, events, or circumstances can constitute hazards when their nature would potentially allow them to cause damage to health, life, property, or any other interest of value.
Example of risk assessment: A NASA model showing areas at high risk from impact for the International Space Station. Risk management is the identification, evaluation, and prioritization of risks, [1] followed by the minimization, monitoring, and control of the impact or probability of those risks occurring. [2]