The incident at the 3 Mile Island Nuclear Plant has led to many changes in the operation and employee training in U.S. Nuclear Power Industry. This paper presents an approach to the preparation of a comprehensive geographic information system that would meet the needs for monitoring, movement of population away from a site and general information for decision making. The geographic system would cover each of the 72 plants now in operation and the approximately 94 sites under construction. Each site would have a portfolio prepared to show: a high altitude aerial photo and selected low level photos, inventory of drinking water locations, an inventory of dairy farms, a population distribution plot, an inventory of food crop-producing farms, general land-use to a USGS level III/IV, meteorological data, routes of egress and access, and a topographic map with potential monitoring sites. The paper proposes how to use aerial photography, topographic maps and meterological data to prepare the emergency documents. Cost of acquisition, analysis and documentation are presented.