RISK ANDTOLERABILITYCRITERIA: ARE WEC O M PA R I N G A P P L E SAND PEARS?total risk based on the numberof people affected and thefrequency of the relevant eventsisk is a somewhatand is often used as a synonym fornebular concept,societal or group risk. That mightparticularlyinbe risk of a single scenario orthe context ofmultiple hazards. Individual risk,major accidents.on the other hand, considers theAlthough we are often driventotal risk to a single person fromto try to make it as precise asall hazards on an establishment.possible, there are inevitablyRisk assessments can calculateaassumptionsvarious forms of risk, so we needrequired to narrow down theto be clear what the numberinputs to a single number. A lotgenerated really is.of things are dependent on theHSE guidance such as ‘Reducingoutcome of risk assessment;Risks, Protecting People - HSE’swithout it we run the risk ofdecision-making process’ (R2P2)neglecting to manage our moreis helpful in providing tolerabilitysignificant hazards, and so it iscriteria for individual risk, oftenimportant to appreciate wherereferred to as the ALARP triangle,the assessment comes fromhowever there is less clarity forand to understand the results.societal risk.How risk is presented plays aAn F-N graph can be developedvital role in how it is perceivedto illustrate criteria for societaland managed, but how canrisk using HSE’s guidance in theirwe make such an intangible‘Guidance on ALARP Decisionsconcept into something morein COMAH’ document. The F-Nmaterial?graph allows the cumulativeRHow risk ispresented plays avital role in how itis perceived andmanaged, buthow can we makesuch an intangibleconcept intosomething morematerial?Aggregated risk determines thenumberoffrequencyeventsatanTolerability as a driverestablishment per year (F) toOne driver for presenting risk asbe plotted against the numbera single number is to compareof fatalities from all eventsthattolerabilityassessed (N), allowing for theThe first factor thatposition of the assessed riskshould be considered whenagainst the societal risk criteriapresenting the outcomes of ato be presented.risk assessment in this way is aIt is important to consider thatclear understanding of what isthe risk criteria provided bybeing assessed or calculated.the UK regulator are intendednumbercriteria.12ofI N S I G H TtoM AG AZ I N E
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