Table 2 FMEA probability evaluation matrix for controls.
From: Cryogenic control system operational experience at SNS
Ranking the Probability for Software Controls | Rank |
Known bug likely to occur in one month. | 10 |
Know bug likely to occur in 3–6 months. | 7 |
Known bug likely to occur in 1–3 years. | 4 |
Processor/module has SNS controls standardized version of software. | 1 |
Ranking the Probability for Hardware Controls | Rank |
Known hardware defect. | 10 |
Mean time to failure in 3–6 months. | 7 |
Mean time to failure to in 1–3 years. | 4 |
Processor/module has SNS controls standardized version of hardware in manufacturer’s intended environment. | 1 |