Experimental study on sedimentary radioactive source-tems distribution characteristics of in-service nuclear power plants

IF 1.9 3区工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY

Nuclear Engineering and Design Pub Date : 2025-02-11 DOI:10.1016/j.nucengdes.2025.113906

Guoqing Xu , Weizhong Sun , Zhihua Li , Yao Wu , Weiqi Li , Yushou Song , Guobao Wang

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引用次数: 0

Abstract

The number of investigation objects of sedimentary radioactive source-tems of in-service nuclear power plants is huge, so we can only select a few objects for investigation. Mastering the distribution characteristics of sedimentary radioactive source-tems can improve the representativeness and rationality of the selection of investigation objects, and it can also effectively reduce the cost. Based on four pressurized water reactor units, the scope of preliminary sedimentary radioactive source-tems investigation was determined according to the design principles of each system and the generation mechanism. The investigation objects were selected in a step-by-step manner, then HPGe, CZT and γ dose rate meter were used to measure the selected objects, and the experimental data were visualized by statistical methods. The experimental results were analyzed from three aspects: nuclide level, system level and unit level. The analysis results show that the distribution of ⁶⁰Co and ⁵⁸Co in the sedimentary radioactive source-tems is the most widespread and the highest in proportion, with a combined proportion of over 80%. The surface activity of the sedimentary radioactive source-tems in RCP, RCV, and RRA is the highest, and the types of sedimentary radioactive source-tems in the same system among the four units are basically the same. The distribution of the ambient dose equivalent rate and the surface activity of the sedimentary radioactive source-tems in each unit is roughly equivalent. The results of this experimental study can provide important reference value for the subsequent sedimentary radioactive source-tems investigation of the same type of nuclear power plant.

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来源期刊

Nuclear Engineering and Design 工程技术-核科学技术

CiteScore

3.40

自引率

11.80%

发文量

377

审稿时长

5 months

期刊介绍： Nuclear Engineering and Design covers the wide range of disciplines involved in the engineering, design, safety and construction of nuclear fission reactors. The Editors welcome papers both on applied and innovative aspects and developments in nuclear science and technology. Fundamentals of Reactor Design include: • Thermal-Hydraulics and Core Physics • Safety Analysis, Risk Assessment (PSA) • Structural and Mechanical Engineering • Materials Science • Fuel Behavior and Design • Structural Plant Design • Engineering of Reactor Components • Experiments Aspects beyond fundamentals of Reactor Design covered: • Accident Mitigation Measures • Reactor Control Systems • Licensing Issues • Safeguard Engineering • Economy of Plants • Reprocessing / Waste Disposal • Applications of Nuclear Energy • Maintenance • Decommissioning Papers on new reactor ideas and developments (Generation IV reactors) such as inherently safe modular HTRs, High Performance LWRs/HWRs and LMFBs/GFR will be considered; Actinide Burners, Accelerator Driven Systems, Energy Amplifiers and other special designs of power and research reactors and their applications are also encouraged.