In order to examine the dispersion of tritium released from the Takahama nuclear power plant into Uchiura Bay, seawater was sampled at three stations off the release point every two months. Tritium concentrations in these samples were determined. Simultaneously, the surface temperature of the seawater was also recorded at 25 points around the sampling stations. Observed data indicated that on those occasions when the sampling coincided with the release of tritium from the plant, the contribution of released tritium could be temporarily detected within the dispersion area of thermal effluent.
