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Objectives: This study aimed to identify the relationship between thoughts and psychological anxiety about nuclear power among Busan residents. Methods: Convenience sampling was used for this cross-sectional survey conducted from February 13 to 14, 2016. A total of 520 residents participated in the study and completed a self-administered questionnaire. Results: We found a significant association between negative thoughts and psychological anxiety about nuclear power. People older than 60 years (odds ratio (OR) 2.53, 95% confidence interval (CI) 1.41-4.54), who feared the possibility of radiation accidents (OR 1.75, 95% CI 1.17-2.62), considered nuclear power plants unsafe (OR 1.94, 95% CI 1.10-3.40), and believed the Gori nuclear power plant in Busan must be shut down (OR 1.84, 95% CI 1.22-2.79), had the highest anxiety about radiation exposure. Conclusions: The authors suggest the need for the formulation of a policy to provide people with precise information on nuclear power to increase their understanding and help eliminate unfounded negative thoughts. Furthermore, policy decisions about nuclear power must be based on social consensus.