**Nomenclature**


## **Appendix A**


**Table A1.** The assessment on *S*, *O* and *D* of the twenty-four potential failure modes given by expert 2.

**Table A2.** The assessment on *S*, *O* and *D* of the twenty-four potential failure modes given by expert 3.


**Table A3.** The assessment on *S*, *O* and *D* of the twenty-four potential failure modes given by expert 4.

