QRC-A “to be applied against each category”. Qualitative categories of risks with the consequent actions to be applied for each category for the purpose of protection: “Negligible” (negligible, acceptable without corrective action), “Tolerable” (tolerable, acceptable with adequate protection and in agreement with the Railway Authority) , “Undesirable” (undesirable, acceptable only if the risk reduction is impractical and in agreement with the railway Authority), “Intolerable” (not tolerable, must be eliminated). See Preliminary Hazard Analysis (PHA)
Link... for your business