The safety approach of SMART is based on a defense-in-depth concept with extensive use of inherent safety features and passive engineered safety systems combined with proven active systems. Substantial parts of the design features of the SMART have already been proven in industry.

15.4.8.1 Application of defense-in-depth concept

In the SMART design, adopting and implementing safety features for all levels implement the defense-in-depth concept:

1st level: minimization of an abnormal operation and failures.

2nd level: control of an abnormal operation and a detection of failures.

3rd level: control of accidents within a design basis.

4th level: control of severe plant conditions, including prevention of accident progression and mitigation of the consequences of severe accidents.