Appendix 10. Scoring Criteria for BETAPLUS Common Cause Model
A10.1. Checklist and Scoring for Equipment Containing Programable Electronics
Score between 0 and 100% of the indicated maximum values.
| 1. Separation/segregation | A Max. Score | B Max. Score |
|---|---|---|
| Are all signal cables separated at all positions? | 15 | 52 |
| Are the programable channels on separate printed circuit boards? | 85 | 55 |
| OR are the programable channels in separate racks? | 90 | 60 |
| OR in separate rooms or buildings? | 95 | 65 |
| MAXIMUM SCORE | 110 | 117 |
| 2. Diversity | A Max. Score | B Max. Score |
|---|---|---|
| Do the channels employ diverse technologies; 1 electronic + 1 mechanical/pneumatic? | 100 | 25 |
| OR 1 electronic or CPU + 1 relay based? | 90 | 25 |
| OR 1 CPU + 1 electronic hardwired? | 70 | 25 |
| OR do identical channels employ enhanced voting? i.e. ‘M out of N’ where ... |
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