Nuclear power plants 149 Congresses 43 Nuclear energy 32 Safety measures 32 Nuclear industry 22 Environmental aspects 19 Nuclear reactors 15 Reliability 12 Design and construction 11 Economic aspects 8 Waste disposal 8 Electric power-plants 7 Equipment and supplies 7 Power resources 7 Accidents 6 Decommissioning 6 Earthquake effects 6 Location 6 Measurement 6 Nuclear weapons 6 Radioactive waste disposal 6 Energy policy 5 Law and legislation 5 Nuclear engineering 5 Nuclear pressure vessels 5 Security measures 5 Heat 4 Heat exchangers 4 Management 4 Nuclear physics 4