Computer code for criticality detector placement and evacuation analysis

One of the risks inherent in operation of a Pu handling and processing facility is the possibility of a criticality incident. To detect and warn personnel of a critical event, a detection and alarm system is required. A computer code, IRON19K has been developed to determine the best location for criticality incident detectors. The code uses a defined source, usually the minimum number of fissions in a potential critical incident or any desired level of fissions. The code uses a three dimensional wall and object library and a library of criticality detector locations. The code allows the user to define the grid size used for the facility of interest and determines the quality of detector coverage at each grid point. The code places a point source at each grid location, computes the gamma dose rate at each detector location and prints a picture with printhead symbols which show dose rates at each grid point. The code can also be used to generate anticipated dose rates at specific locations in a facility at various times after the onset of a critical event to aid in evacuation planning