This paper investigates the regional population where nuclear power plant construction was planned but subsequently canceled in Japan. Using national census data from 2000, 2010, and 2020, the analysis calculates populations within concentric zones（5km, 10km, 20km, 30km, 50km, 80km, and 100km radii）centered on the planned sites through GIS-based area-weighted methods. In addition to these concentric distances, the study emphasizes socially and institutionally meaningful ranges, such as the Precautionary Action Zone（PAZ）, the Urgent Protective Action Planning Zone（UPZ）, and evacuation/compensation areas defined by Operational Intervention Levels（OILs）after the Fukushima Daiichi accident. The results reveal that many canceled sites were located in small municipalities with declining populations, often below 10,000 residents,while a limited number of sites were situated in more populous areas exceeding 100,000 residents. This comparison highlights that, in the event of a severe nuclear accident, the scale of compensation burdens would be unmanageable for sites surrounded by large populations, far exceeding the financial capacity of existing electric utilities. By integrating both geometric and policy-relevant spatial frameworks, this study contributes to nuclear disaster preparedness by clarifying demographic risks not only around existing nuclear power plants but also in regions where construction was halted.

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