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# (HIRARC), 2008 - Dosh

(HIRARC), 2008 - Dosh

HIRARC4.3.3.2 Severity of hazard• Guidelines for Hazard Identification, Risk Assessment and Risk Control •Severity can be divided into five categories. Severity are based upon an increasing levelof severity to an individual’s health, the environment, or to property. Table B indicatesseverity by using the following table:SEVERITY (S) EX AMPLE RATINGCatastrophic Numerous fatalities, irrecoverable property damage 5and productivityFatal Approximately one single fatality major property damage 4if hazard is realizedSerious Non-fatal injury, permanent disability 3Minor Disabling but not permanent injury 2Negligible Minor abrasions, bruises, cuts, first aid type injury 14.3.3.3 Risk assessmentRisk can be presented in variety of ways to communicate the results of analysis to makedecision on risk control. For risk analysis that uses likelihood and severity in qualitativemethod, presenting result in a risk matrix is a very effective way of communicating thedistribution of the risk throughout a plant and area in a workplace.Risk can be calculated using the following formula:L x S = Relative RiskL = LikelihoodS = SeverityTable B• Department of Occupational Safety and Health •11

HIRARC• Guidelines for Hazard Identification, Risk Assessment and Risk Control •An example of risk matrix (Table C) is shown below:Severity (S)Likelihood (L) 1 2 3 4 55 5 10 15 20 254 4 8 12 16 203 3 6 9 12 152 2 4 6 8 101 1 2 3 4 5HighMediumLowTable CTo use this matrix, first find the severity column that best describes the outcome of risk.Then follow the likelihood row to find the description that best suits the likelihood that theseverity will occur. The risk level is given in the box where the row and column meet.The relative risk value can be used to prioritize necessary actions to effectively managework place hazards. Table D determines priority based on the following ranges:RISK DESCRIPTION ACTION15 - 25 HIGHA HIGH risk requires immediate action to control thehazard as detailed in the hierarchy of control. Actionstaken must be documented on the risk assessmentform including date for completion.5 - 12 MEDIUM1 - 4 LOWA MEDIUM risk requires a planned approach tocontrolling the hazard and applies temporary measureif required. Actions taken must be documented on therisk assessment form including date for completion.A risk identified as LOW may be considered asacceptable and further reduction may not be necessary.However, if the risk can be resolved quickly andefficiently, control measures should be implementedand recorded.Table D12• Department of Occupational Safety and Health •

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