[en] The steam generator tube rupture accident at PWRs is an important design basis accident to be evaluated in nuclear power plant safety analysis report. With the classification of this accident condition being changed from limiting accident to infrequent accident, the radiological consequence can not meet our country's acceptance criteria. The calculation assumption, source term of SGTR, acceptance criteria and practices in China and abroad are discussed, the conclusion is that the SGTR accident should be studied further to seek solutions from design, and a more reasonable acceptance criteria should be given. (authors)

[en] Briefly describing the necessity of the development of environmental impact review principle of thermal discharge of nuclear power plant, introducing the referenced foreign practices, technique basis and the main content of review principle, discussing the key issues of review principle. (authors)

[en] Based on review experiences of several coastal nuclear power plants, the report analyzes some key problems worthy of note in physical impact simulation of thermal discharge from the nuclear power plant. Also some suggestions of evaluation and review opinion are provided. (authors)

[en] This paper introduced the NRC's regulatory development in the Recent Standard Review Plan for the Review of Safety Analysis Reports for Nuclear Power Plants of advanced light water reactors and discussed the findings of the Radiological Consequences Analysis. (authors)

[en] We reviewed the progress in the estimation of radioactive materials emission into the atmosphere, environmental monitoring results and the evaluation of the corresponding public exposure due to the Fukushima Daiichi Nuclear Power Station accident, according to the press releases from Nuclear and Industrial Safety Agency (NISA), Ministry of Economy, Trade and Industry (METI), Japan, Nuclear Safety Commission, Cabinet Office, Japan (NSC), Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT), Japan Atomic Energy Agency (JAEA), Tokyo Electric Power Co. Inc., Japan (TEPCO), etc. We also discussed the issues of concern in further evaluation. (authors)

[en] After Fukushima nuclear accident, the world's nuclear emergency, especially nuclear power plant nuclear accident emergency work is facing new challenges. Countries around the world have improved the accident response measures from the national level and the nuclear facilities, to strengthen the nuclear accident emergency preparedness and response capacity building. Based on the research of the construction of nuclear accident emergency rescue capabilities of France, the United States, Germany, the construction of nuclear fast rescue forces for nuclear accidents emergency at nuclear power plants of China's Nuclear Power Corporation-level after Fukushima is summarized. (authors)

[en] The discussion on control room envelope integrity, source term analysis in habitability assessments and other impact factors for dose consequence is provided combined with regulatory requirements and the current status of domestic NPPs. Considering that the infiltration is an important factor for control room habitability assessment, CRE integrity test should be performed to demonstrate the CRE's infiltration characteristics. The consequence assessment should be performed based on different DBAs and different pathways, such as pathways internal to the plant. (authors)

[en] Since the occurrence of the Fukushima accident, organization including Tokyo Electric Power Cooperation (TEPC O) and the Ministry of Education, Culture, Sports, Science and Technology (MEXT) have been releasing data about the leakage or discharge of high-or low-level radioactive waste liquid as well as monitoring data of marine environment and marine products. By analyzing data released before May 6, 2011, an analysis about the temporal and spatial variation of radioactivity concentration in the seawater was given, as well as the preliminary evaluation of marine biota dose and public dose. (authors)

[en] Based on the experience feedback of the comprehensive emergency exercise of one chinese NPP in 2014, this paper offers some viewpoints and practice about the systematization and Non-Notice mode of emergency exercise of nuclear power plant (NPP) which focus on how to organize and improve the effectiveness of the large-scale nuclear accident emergency exercise. It is hopeful to provide reference to chinese industry. (authors)

[en] Cobalt-mediated peroxymonosulfate (PMS) activation is an effective way to generate sulfate radicals for the degradation of pollutants. Herein, a heterogeneous Co-based catalyst was prepared by integrating the cobalt species to the cavities of g-C₃N₄ via the CoN bonds through the methods of impregnation and calcination, which was applied to activate PMS for the degradation of organic contaminates under visible light. The cobalt species were atomically dispersed on g-C₃N₄, which could provide more reactive sites for PMS activation. The catalytic efficiency of cobalt-doped g-C₃N₄ was greater than that of pure g-C₃N₄ or even slightly higher than that of the homogeneous cobalt ions during the photo-assisted PMS activation catalytic processes. The optimum Co loading is 1.0% in weight. In 25 min, the dye of rhodamine B was almost completely degraded with a 70.5% of total organic carbon (TOC) removal under its natural pH value in the presence of such catalytic system. The enhanced catalytic activity of Co-doped g-C₃N₄ was due to the effective separation of the photo-generated charges as well as the sufficient accessible reactive sites for PMS activation. And the synergistic interaction between the photocatalytic and PMS activation processes facilitated the generation of active species for the removal of pollutants.