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S
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High-Level Risk Hierarchy
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Evaluation Criteria (1-10 Scale)
Use these standardized tables to ensure consistent rating assignments. The severity rating now includes multi-factor impact analysis (Operations, Health/Safety, Environmental, Cost).
S
Severity (Multi-Factor Impact)
| Score | Operational Impact | Health & Safety (HSE) | Environmental Impact | Financial / Cost |
|---|---|---|---|---|
| 10 | Danger without warning; Complete system destruction | Fatality or multiple life-threatening injuries | Catastrophic off-site release; Irreversible damage | > $1,000,000 |
| 9 | Danger with warning; Complete regulatory shutdown | Severe injury / permanent disability | Major off-site release; Long-term remediation | $500,000 - $1,000,000 |
| 8 | Loss of primary function; >1 week downtime | Lost Time Incident (LTI); Hospitalization | Significant on-site release; Reportable to authorities | $100,000 - $500,000 |
| 7 | Highly reduced primary function; >24h downtime | Medical Treatment Case (MTC) | Moderate on-site release; Outside help required | $50,000 - $100,000 |
| 6 | Loss of secondary function; Shift disruption | Restricted Work Case (RWC) | Minor on-site release; Internal cleanup | $10,000 - $50,000 |
| 5 | Reduced secondary function; Degraded performance | First Aid Case (FAC) | Minor spill; easily contained within local area | $5,000 - $10,000 |
| 4 | Very low impact; Noticed by most operators | Minor discomfort; Near miss | Negligible impact; handled immediately | $1,000 - $5,000 |
| 3 | Minor annoyance; Noticed by average operator | Slight discomfort | No off-site or significant on-site impact | $100 - $1,000 |
| 2 | Very minor effect; Noticed only by experts | No safety risk | No environmental risk | < $100 |
| 1 | No discernible effect | None | None | None |
O
Occurrence
- 10 > 1 in 10 (Almost Certain)
- 9 1 in 20 (Very High)
- 8 1 in 50 (High)
- 7 1 in 100 (Moderately High)
- 6 1 in 500 (Moderate)
- 5 1 in 2,000 (Low)
- 4 1 in 10,000 (Very Low)
- 3 1 in 100,000 (Remote)
- 2 1 in 1,000,000 (Very Remote)
- 1 < 1 in 1.5M (Nearly Impossible)
D
Detection
- 10 Absolute Uncertainty / No Controls
- 9 Very Remote probability of detection
- 8 Remote probability of detection
- 7 Very Low probability
- 6 Low probability
- 5 Moderate probability
- 4 Moderately High probability
- 3 High probability
- 2 Very High probability
- 1 Almost Certain to detect prior to failure