Nuclear power has become a common source of energy for communities around the world. Despite relatively few global incidents, the potential for nuclear disaster always exists. Effective risk communication plays a critical role in reducing the loss of life and property when a nuclear failure arises. An overlooked aspect of existing studies on nuclear risk communication is to evaluate the information sources within and beyond the emergency planning zone (EPZ). To this end, the study has evaluated the effectiveness of risk communication for Arkansas Nuclear One, the only nuclear power plant in Arkansas, US. A structured survey was distributed to 185 local residents, especially to those living within the 10-mile EPZ of the plant. The survey aimed to assess public risk perception, preparedness levels, and the channels through which the information was received. The de facto preparedness knowledge in terms of R-score was quantified, interpolated, and visualized. The results identify the inequalities of demographic, contextual, and spatial factors in dictating risk communication within and beyond the nuclear EPZ. They reveal that the spatial awareness of the EPZ may serve as a better indicator of residents' preparedness level than their residential proximity to the nuclear power plant. The study further suggests that the active acquisition and effective comprehension of locational knowledge in the at-risk communities have significantly improved the preparedness level. This finding sheds new lights on policy recommendations for emergency management departments to proactively distribute health information and alleviate public stresses about the nuclear industry.