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Emergency Preparedness for Tunnel Fires a Systems-Oriented Approach

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Emergency Preparedness for Tunnel Fires a Systems-Oriented Approach BOOK OF PROCEEDINGS Nordic Fire & Safety Days Emergency Preparedness for Tunnel Fires A Systems-oriented Approach Henrik Bjelland Ove Njå Atle William Heskestad Geir Sverre Braut Multiconsult SEROS Norwegian Railway Directorate SEROS Oslo, Norway University of Stavanger, Trondheim, Norway University of Stavanger, [email protected] Norway [email protected] Norway [email protected] [email protected] Keywords: tunnel fire safety, systems approach, emergency severe incidents the past decade, to which it is easy to portray preparedness analysis, constraints, coherence disastrous scenarios exposing many people to a deadly fire. ABSTRACT Emergency preapredness Road tunnels are important elements in the Norwegian Emergency preparedness are all technical, operational and communication infrastructure. According to the Norwegian organizational measures that prevent a dangerous situation that Public Roads Administration (NPRA) “the risk is low, but the has occurred from developing into an accidental event, or accident potential is high”. Hence, efficient emergency which prevent or reduce the harmful effects of accidental response is key to prevent major injuries and losses in tunnel events that have occurred [1]. fires. Our general concern in this paper is to what degree we are prepared, and by which means we can be prepared for a November 2016, the NPRA issued a new version of major fire in a single tube road tunnel. Successful emergency Handbook N500 Road Tunnels [2]. This version introduces the response to tunnel fires is dependent on many actors concept of emergency preparedness as a part of the safety collaborating under serious time constraints. Safety becomes a management of Norwegian road tunnels. An emergency matter of maintaining the critical processes necessary to keep preparedness analysis are now required for tunnels > 1,000 the system in a safe state. Efficient decision-making in meters. The emergency preparedness analysis must cover the situations of major uncertainty is essential to achieve safety phases from alert, mobilization, rescue, evacuation and goals. This essentially means that efficient emergency normalization. There is, however, no mentioning of the preparedness to road tunnels is a matter that needs resolving in important phases of detection and combat, which are natural the design, construction and normal operation phases. To parts of an emergency preparedness analysis [1]. achieve high-performance emergency preparedness to tunnel Although it is required that road tunnels are to be designed fires, there is a need for radical changes to designing and based on risk assessments and emergency preparedness operating tunnels. In this paper, we claim that a system- analyses, a major problem is that none has described acceptable theoretic approach is appropriate to deal with the tunnel risk levels or specific requirements to emergency preparedness. system’s complexity and drive the design of appropriate As a quality assurance measure, N500 require the Norwegian control structures for critical processes from the design phase Public Roads Directorate to approve the method chosen for risk to the actual emergency. and emergency preparedness analyses. This practice may prevent sub-quality analyses. However, as selection of methods BACKGROUND for risk and preparedness analyses depends upon the scope of the analyses and available data, the practice impose major Road tunnels are important elements in the Norwegian competency requirements on those who shall approve the communication infrastructure. Some tunnels are urban, methodological design. complex traffic machines facilitating heavy traffic. A significant number of tunnels are low standard and low traffic Performance - a systemic issue tunnels, located miles away from poorly equipped voluntary fire departments. Tunnels imply potentials for major accidents, In this paper, we adopt our proposed framework [3] for calling for professional emergency response arrangements. assessing emergency response strategies to fire in a single tube Every year Norway experience about 20 fires in its 1150 road road tunnel. Our study holds a Norwegian perspective tunnels. The Norwegian Public Roads Administration (NPRA) concerning road tunnel standard, safety regulations, bases risk on the historical frequency of fatal traffic accidents, dimensioning of emergency response and its organization, often claiming; “the risk is low, but the accident potential is climate and other frame conditions. We have selected a high”. It is true that Norway has not yet experienced many Norwegian single-tube road tunnel as an object for case deaths in road tunnel fires. However, there have been 5-6 studies. 106 BOOK OF PROCEEDINGS Nordic Fire & Safety Days When the performance of the evacuation system is part of The control actions must take place in a complex and the risk and preparedness analysis, the development of dynamic socio-technical system. A fire situation in a road dimensioning events is crucial. This includes specifying the tunnel involves many actors, whose individual actions, and competency and state of the road-users, the number of road- interaction with others, will determine the outcome of the users involved, fire scenario and emergency response actions. incident. Leveson claims that accidents occur because the Simulating the fire scenarios is an important part of the controller has not enforced the safety constraints, or that analyses, which will lead to exposure of the road-users and appropriate control actions has not been followed. In a previous demonstrate that, e.g. emergency shelters need to be installed paper [3] we have outlined a framework for fire safety design and used. from a systems theoretic perspective. Our general concern is to what degree we are prepared, and When a fire occurs in a road tunnel, the predominant by which means we can be prepared for a major fire in a single strategy is to start the longitudinal fire ventilation. Wind tube road tunnel. Are Norwegian tunnels designed and direction is usually predetermined based on the location of the equipped to allow for efficient self-evacuation? Are most resourceful local fire department. Wind direction from responsibilities related to emergency preparedness sufficiently this location allows the fire department to enter the tunnel with clarified? Are Norwegian tunnel-users familiar with emergency the wind in their back. This allows for safe advancing towards response strategies? Are there weaknesses in the operational the fire and improves conditions for effective firefighting. We safety management organization? Finally, is the predominant question this strategy for single tube road tunnels. Our main Norwegian strategy for emergency response to fires in single concern has been to study the consequences of unconditionally tube road tunnels appropriate to facilitate the best chances of prioritizing safe firefighting conditions over other concerns, saving lives? such as life safety conditions for road-users within the tunnel. This kind of ventilation management has the potential of We discuss the application of systems thinking for exposing many people to harmful conditions, and thereby emergency preparedness analyses for road tunnels, which worsening the situation for the involved. emphasizes consequences and associated uncertainties. Systems thinking may serve as a complement to risk-based MAJOR NORWEGIAN TUNNEL FIRES thinking. The systems-oriented approach emphasizes the description of the system, the development of dimensioning scenarios and identification of the necessary safety constraints This section include findings from investigations after some in order to keep the system in a safe state. So instead of looking major Norwegian tunnel fires during the past decade. These for probabilities, uncertainties and adverse events we look for narratives serves as a reminder of what fire scenarios we might road-users’ and emergency services’ performances to ensure expect in the future and illuminate variations in critical factors. that safety is controlled for the tunnel system. Hence, it implies what loads we may expect a fire to impose on the emergency response system, including the tunnel We address the development of safety constraints from the construction and its technical safety systems, the drivers and use of fire investigations and we discuss how to put such passengers and the emergency responders (fire, police constraints into action. Adopting this approach to the N500 ambulance, Norwegian public road administration, regulation will introduce major changes to existing compliance municipalities, hospitals and so on). None was killed in the based road safety management practices, but it will also embed presented fires, but international tunnel fires, such as the Mont the increased weight on tunnel’s emergency preparedness Blanc, the St.Gotthard and the Tauern fires remind us on the system into practical administration work. extent and devastating impact. However, for the Norwegian fires it is easy to portray alternative circumstances that may PROBLEM FORMULATION have led to several fatalities. According to Leveson [4], accidents are products of Oslofjord 1 (March 29, 2011) inadequate control or enforcement of safety-related constraints A fire started in a Polish lorry loaded with 30 tons of paper on the development, design, and operation of the system. rolls. The fire occurred near the low point of the tunnel, and Safety is a control problem. Accidents may occur due to 1) from the video camera, the
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