By International Atomic Energy Agency
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Additional info for On-site habitability in the event of an accident at a nuclear facility : guidance for assessment and improvement
Example text
5% radioiodines4 In liquid: 50% radioiodines 50% caesiums 1 % other fission products Further assumptions are made that the entire release from the core takes place instantaneously and that after half an hour the activity is homogeneously distributed in the atmosphere and in the water in the containment. At this time the ECCS will have been switched to the recirculation mode. The source term can be expressed as photons-cm" 3 -s~' for different energy intervals. 4. 1. General In the initial assessment, certain key areas or buildings would be identified as areas of interest and the consequences of the accident in terms of its effect on habitability in those locations would then be examined.
The serviceability of equipment and instrumentation should also be regularly checked to ensure that they are operable in case of need. Emergency technical support personnel should also be trained to be mentally prepared for an accident. This includes familiarizing these personnel with all aspects of their response so that they can act correctly under accident conditions. Since many of these individuals are not called upon in a daily routine to perform these tasks, training may have to be quite rigorous.
19. DEVELOPING AND IMPLEMENTING ACTIONS TO ENSURE HABITABILITY CRITERIA ARE MET If it has been determined that habitability is unacceptable for given operations and these operations must be performed in order to bring the accident under control or to maintain the facility in a safe condition, then techniques must be devised to allow the operation to be carried out in a manner which is safe for personnel. 9. As an example, using a railway accident scenario involving the release of chlorine gas (assuming nothing could be done to reduce the possibility of the accident or its magnitude), the facility control room (which has to be permanently occupied) might have to be equipped with a ventilation system that would remove chlorine or prevent entry of chlorine into the ventilation system.