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Radiological Impact of Nuclear Power Activities on the Marine Environment in China Lin Rongcheng Third Institute of Oceanography State Oceanic Administration Xiamen, Fujian, China in China Concentrations of Nuclide ~(110m)Ag in Marine Samples around Daya Bay Nuclear Power Station Radioactivity level was investigated before the operation of LNPS (Ling‘ao Nuclear Power Station) based on the normal monitoring of GNPS (Guangdong Daya Bay Nuclear Power Station). The results showed that nuclide 110mAg in effluents from GNPS can be tested in part of marine samples such as pear oyster, algae (sargassum) and cuttlefish. Concentrations of nuclide 110mAg in pearl oyster and cuttlefish samples from Dongshan which located nearby GNPS were higher than that of Aotou which away from GNPS. Cs-137 contents in the marine organisms, seawater and sediment in Daya Bay before and after the NPP operation The contents of Cs-137 in some marine organisms, seawaters and sea sediment in Daya Bay area were measured by γ spectrometer. The concentration factors for the marine organisms and distribution coefficient between sediment and seawater have been calculated. The results showed that the apparent difference between Cs-137 contents in samples after and before the operation of Daya Bay Nuclear Power Plant were not found. Ecological response of phytoplankton to the operation of Daya Bay nuclear power station Based on the data from 1991 to 2001,the environmental change and biological response were analyzed. The result showed that during the past 10 years,total inorganic nitrogen gradually increased ,silicate and phosphate gradually decreased from 1996 to 2000 and then returned to former leve1. After the nuclear power station running,the average temperature of the investigation area increased about 0.4-1.0℃. In recent years,phytoplankton distinctly went up during the end of autumn and the beginning of winter,the amount of pyrophyta and warm-water species generally increased and net-phytoplankton generally decreased . Assessment of effects of Qinshan nuclear power station Based on the data of biological and non-biological factors collected respectively from 1989 to 1990 and from 1995 to 1996 in the waters nearby the Qinshan nuclear power station, the ecological environment and water quality are analyzed and assessed. The results show: (a) the survey area has the typical ecological characteristics of the high tidal range estuary-rich nutrients and low biological productivity, (b) tide, runoff and offshore seawater intrusion are the key factors which resulted in seasonal and annual changes of the various biological and nonbiological factors, (c) the rising of seawater eutrophication index results from enormous amount of the discharges form the industrial and urban sewage, (d) because the survey area is located at a high tidal-range estuary, thermal effluent from the cooling system does not induce to the significant temperature changes, (e) the first stage project of Qinshan nuclear power station has not made a notable impact on the ecological environment in the area since running. Conclusion The levels and composition of environmental radioactivity at the outlets of nuclear power plants and nearby coastal environs in China have been investigated Anthropogenic radionuclides contribute very little to the total radioactivities in seawater, algae, fish and sediment samples. nuclide 110mAg in effluents from GNPS can be tested in part of marine samples such as pear oyster, algae and cuttlefish, but within its regulatory limits. Thanks!