This article is the first part of a feature on the 6.6km long Westerschelde Tunnel in the Netherlands. It examines terminology, 'chain of safety' concept, risk analysis, and scenario analysis. bored tunnel will carry a new motorway, and has two separate bore each with two lanes; its deepest point will be about 60m below se level. The article describes the safety concept used, and suggest how to continue its development. It first defines 'risk', 'societ risk', and 'individual risk'. The overall approach to the safety project can be based on a 'chain of safety', with the following steps. The proactive stage aims to prevent unsafe alternatives wherever possible, so that it eliminates or greatly reduces some specific risk probabilities. The preventive stage reduces the probability of accidents, and prevents or limits their consequenc The preparatory stage concerns preparing for emergencies and redu consequences. The repressive stage concerns the provision of aid police, fire, and ambulance services, and management and maintena staff, and addresses further reduction of consequences. In additi the safety level should be estimated by a quantitative risk analy a limited number of scenarios for possible accidents should be analysed in detail, and designs should be sought which raise safe and decrease costs to As Low As Reasonably Achievable (ALARA Principle).

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    PO BOX 452
    KEMPSTON, BEDFORD,   United Kingdom  MK43 9PL
  • Authors:
    • WORM, E W
    • HOESKMA, J
  • Publication Date: 1999-5


  • English

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Filing Info

  • Accession Number: 00767200
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD,
  • Created Date: Aug 6 2000 12:00AM