Chemical Health Risk Assessment (CHRA) Process
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Chemical Health Risk Assessment
(CHRA)
Process
CHEMICAL HEALTH RISK ASSESSMENT
(CHRA)
• A structured approach to identifying, evaluating and controlling chemical health hazards in the workplace.
RHM CONSULTANT SDN BHD HRA-1M
What is CHRA ?
Gather information
Evaluate the risk
Is the risk to health controlled
to be as low as reasonably
practicable ?-ALARP
Further info needed?
IDENTIFY
YES NO
Record assessment Decide on remedial action
CONTROL &
RECOVER
Review
ASSESS
Deciding the assessor
CHRA Process
• Gather information
• Hazard Rating (degree of hazard)
• Assessment units
• Exposure evaluation
CHRA Process
• Assess adequacy of control measures
• Evaluate risk and conclude assessment
• Action plan/recommendations
• Report submission
• Review assessment
Risk Evaluation
• RR = (HR X ER)RR = risk rating, HR = hazard ratingER = exposure rating
• RR = 1, 2 - risk not significant
• RR = 3,4 - risk significant cat 1(adequately controlled but could increase in future)
• RR = 5 - risk significant cat 2 (not adequately controlled)
Hazard Rating
• Based on toxicity
• Rating 1-5, 5 most hazardous
• Information from MSDS, CPL regulations
Exposure Rating
• Depend on magnitude of exposure, frequency and duration of exposure
• Magnitude of exposure derived from on professional Judgement and workplace observation, records of monitoring, and additive effect of chemicals
HAZARD
RATING
EXPOSURE RATING (ER)
1 2 3 4 5
(HR)
1 RR=1 RR=2 RR=2 RR=2 RR=3
2 RR=2 RR=2 RR=3 RR=3 RR=4
3 RR=2 RR=3 RR=3 RR=4 RR=4
4 RR=2 RR=3 RR=4 RR=4 RR=5
5 RR=3 RR=4 RR=4 RR=5 RR=5
Gathering Information
• Identify Chemical Hazards used or released in the workplace
• Layout plan/process description/flowchart
• Identify Job Types and employees at risk
• Records of incidence/accidents/monitoring/inspection etc.
• Control measures including training and health surveillance
Identify Hazards
• Divide into manageable units( Assessment /WorkUnits )
• Walk-through survey- Looking at ( equipment,chemicals, activities etc.)
• Make a Task/Hazards matrix
• Look at Records-(incidents/fault reports, inspections, maintenance, sickness absence, hygiene surveys )
• Create an inventory of Chemical Hazards
Documents/Information Required
• Plant Layout Plan
• Operation Overview/ Process Flowcharts
• Organisation Chart
• List of chemicals
• JobTypes/Tasks for each units and list of employees
• Other records-at site-Safety Manual, incidents/faults, inspections, maintenance, sickness absence, Medical Records(Clinic), hygiene surveys, minutes of safety meeting.
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