| RISK PROBABILITY | RISK SEVERITY | ||||
| CATASTROPHIC A | HAZARDOUS B | MAJOR C | MINOR D | NEGLIGIBLE E | |
| 5 FREQUENT | 5A | 5B | 5C | 5D | 5E |
| 4 OCCASIONAL | 4A | 4B | 4C | 4D | 4E |
| 3 REMOTE | 3A | 3B | 3C | 3D | 3E |
| 2 IMPROBABLE | 2A | 2B | 2C | 2D | 2E |
| 1 EXTR. IMPROBABLE | 1A | 1B | 1C | 1D | 1E |