Soltegro presents together with Royal Haskoning a new integrated approach for safety related tunnel processes on the 5th International Symposium on Tunnel Safety en Security 2012 in New York. From March 14 - 16 the Symposium on Tunnel Safety en Security is held for the fifth time. An international conference about tunnel safety. Soltegro presents together with Royal Haskoning her integrated for safety related tunnel processes. By applying the Systems Engineering principles, we are able to bring structure for the system analysis and the design. The result is that the numbers of defects found in the implementation phase, caused by errors in the design, are drastically reduced.

1. An integrated
functional design approach
for safety related tunnel processes
Thijs Ruland, Bas van Duijnhoven and René Krouwel
March 14th, 2012, New York

2. Agenda
A new design approach:
 Why?
 Developments
 Effects
 Diamond model: overview and highlights
 Conclusions and future work
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3. Why?
More systems
More tunnels
Traffic management
Safety
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4. Why?
Developments of rules and roles:
 European legislation: safety officer
 Dutch legislation: important advice before opening tunnel
 Dutch safety officer requires:
 Adequate safety measures in design
 Proof that systems work properly, as designed
 Proof that the organization is properly prepared for its job
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5. Why?
 Principal:
 D&C contracts
 Application of
 Systems Engineering (SE)
 RAMS
 Contractor:
 SE and RAMS are no common
practice
 Contracts:
 Still piles of low level technical
requirements instead of high level
functional requirements
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6. Effects
Many projects:
 Lots of data, but no overview
 Installations and control design still made bottom-up
 Poor integration, poor interface management
 Discussions focused on the technical requirements instead of
desired functionality
 Stakeholders cannot understand design sufficiently
 Difficulties in demonstration of safety to Safety Officer
 Long delays and budget overruns
Source picture: Wikipedia
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7. What then?
We need a design approach that:
 Can handle systems and functions
 Supports SE: top down
 Helps keeping an overview of the information
 Is truly integrated
 Is consistent
 Is transparent
 Enables proof of functionality (safety)
 Systems (2nd requirement safety officer)
 Organization (3rd requirement safety officer)
 Is practical!
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8. Our answer: a model
For systems and functions:
 Structured: supports SE
 Unambiguous
 True integration
 Enables traceability between requirements and design
 Secures consistency between design elements
 Hardware, software, data, personnel and procedures
 Can handle dynamics
 Includes RAMS
 Information can be viewed in many ways
 Large amounts of information can still be handled
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9. Our model: the diamond model
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10. Coentunnel project
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11. Filling the diamond model in 11 steps
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12. Step 2: Describing scenarios
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13. Step 4: Describing interaction entities
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14. Modelling language: SysML
 Introduced in 2006
 A graphical modeling language
 Supports the analysis, specification, design, verification,
and validation of systems
 Holistic set of system views
 Eases exchange of SE information amongst tools
 General ICT purpose: not specifically developed for
tunnels
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15. Conclusions
Worked very well for the Coentunnel project:
 Different views eased communication with stakeholders
 No postponement of important design decisions
 Correctness, consistency and completeness demonstrated
 Design accepted by all parties as the correct functional
system description
 Model can now be used as basis for safety plans and
safety management organization
Advantages of using a model demonstrated
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16. Future work
 Re-use of the basic set
 Make even better use of the possibilities of SysML
 Westerscheldetunnel: existing tunnel (6,6 km)
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17. Thank you for your attention!
www.royalhaskoning.com
www.soltegro.nl
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