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 of identifying vital areas The example of operator actions given in Section A. 2 (alternating the RHR pumps) includes two basic steps, one of which is checking pumps before and after startup and the other the operation of valves to make the change. The first step takes place in the pump rooms and the second step one floor above in a valve handling area. The rooms are listed in Table II, column (4), and the access routes to/from these locations are given in column (12). For the maintenance actions example cited, servicing is performed in the pump rooms and the access route is the same as discussed for the operator action.
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.
The quantities and types of equipment must receive careful consideration and the equipment must be accessible. The choice of types of equipment for damage control is site specific. The equipment must match the type of emergency operation that may need to be carried out, the vital area in which this must be performed, and the potential hazards that may be encountered. It is important that not only should all equipment be readily available, fully serviceable and easily operable, but a resource of backup supplies should also be available (and, if it is brought from off the site, be compatible with on-site equipment) in case the emergency situation is prolonged .
On-site habitability in the event of an accident at a nuclear facility : guidance for assessment and improvement by International Atomic Energy Agency