Table 9 Attributes considered
Attribute | Applicability to evaluation of active protection systems |
|---|---|
Function | This is to determine if the protection is designed according to the relevant hazard and if it will perform as designed |
Human action/performance | If human action is needed in order for the system to work there is an uncertainty added due to human error. |
Complexity | A complex fire protection system increases the probability of error, e.g. if many support systems are needed for the system to perform as intended, (detector activating, fan for smoke exhaust, inlet air needed at the same time). Another issue adding to the complexity is the probability of common cause failures, e.g. if power is lost then the sprinkler system as well as the evacuation alarm is lost. This is addressed in Table 6 by identifying common support systems for different protection systems. |
Reliability | This is the probability that the system will fulfill its purpose on demand. This is connected to both the function (whether it is properly designed) and issues like maintenance. Evaluation of e.g. maintenance needs to be done and a starting point should be to fulfill relevant standards on maintenance for the considered system. |
Vulnerability | This attribute describes the conditions for the survival of the system when exposed to internal and external stress. This is linked to how the system is isolated from the actual event, is it in a separate building etc. |