As a result of evaluating the level of tritium emitted from the nuclear power plant in theenvironment and the human body, it was confirmed that tritium was detected in the environmental mediaand human urine samples to be investigated. It was found that the tritium was clearly detected. Afterthe operation of the Tritium Removal Facility (TRF), which was operated for the purpose of removingtritium from the Wolsong nuclear power plant, the tritium emission showed a decreasing trend, andthe tritium level in the environmental media also showed a tendency to decrease accordingly. However,for precise evaluation, it was necessary to select and investigate points by distance, season, and winddirection from the nuclear power plant, but it also showed characteristics that did not reflect this. Asthe cycle, etc., implemented the previous environmental monitoring program as it is, there was also alimitations in not being able to reflect the changing environment. Therefore, it is necessary to reviewand supplement the environmental monitoring investigation plan and results so far, and by applying thesupplemented investigation plan to secure valid and reliable investigation results, it is judged that it willbe an appropriate measure for environmental conservation and human protection in the vicinity of thenuclear power plant.