API TR 17TR3 : 2004

1 Purpose
2 Scope
3 Background
   3.1 Regulatory Requirements
   3.2 MMS Casing Pressure Data
4 Risk Analysis Method
   4.1 General
   4.2 Fault Tree Analysis
   4.3 Failure Modes and Effects Analysis (FMEA)
   4.4 Methodology Used
5 Casing Pressure Risk Analysis
   5.1 Development Background
   5.2 Risk Analysis Details
6 Results
   6.1 Risk Analysis
   6.2 Sensitivity Study
   6.3 Benefits Analysis
   6.4 Global Risk/Benefits Assessment
7 Conclusions
8 Recommendations
9 References
10 Tables
11 Figures
12 Appendix
   12.1 Appendix A - Potential Leak Paths
   12.2 Appendix B - Fault Tree Details for No Penetrations
   12.3 Appendix C - Fault Tree Details with One Penetration
   12.4 Appendix D - Fault Tree Details with Two Penetrations
   12.5 Appendix E - Fault Tree Details with 1/2-inch
                     Penetrations
   12.6 Appendix F - Sensitivity Analysis Scenario 1
   12.7 Appendix G - Sensitivity Analysis Scenario 2
   12.8 Appendix H - FMEA Data

Provides an evaluation of the risks and benefits of allowing penetrations in subsea wellheads below the blowout preventer (BOP) stack to annuli other than the production tubing (commonly referred to as the "A" annulus) could be monitored.