降额设计作为现代工业自动化研发过程中的一门技术，在产品结构优化和可靠性提升方面发挥着重要作用.核电厂安全级数字化控制系统(DCS)在可靠性方面的要求严格，为满足相应的可靠性指标，在核电厂安全级DCS产品设计研发中进行降额设计是必不可少的.基于降额设计方法，对核电厂安全级DCS所用部分元器件进行可靠性计算和分析，研究不同降额等级下元器件的可靠性水平变化情况，展示降额设计对提高核电厂安全级DCS可靠性的重要作用，为核电领域降额设计的可靠性研究提供参考.如何有效利用降额设计技术，实现核电厂DCS可靠性显著改善是一个值得深究和探讨的话题.
Derating design, as a technology in the research and development process of modern automated industry, plays a great role in the improvement of product design and reliability. Nuclear power plant safety digital control system (DCS) has strict requirements on reliability. In order to meet the corresponding reliability index, it is necessary to carry out derating design in research and development of safety DCS products. Based on the derating design method, the reliability calculation and analysis on some components used in nuclear power plant safety DCS were carried out. The reliability variation of components under different derating grades was studied, and the importance of derating design on reliability improvement of nuclear power plant safety DCS was shown. This research provides some conferences about derating design in the reliability study on the nuclear power.
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National Energy Administration. Ageing, screening, and derating rules of electronic elements and devices in safety class instrument and control equipment of nuclear power plants: NB/T 20019—2010［S］.Beijing: Atomic Energy Press, 2010: 3-7.
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Fifth Research Institute of the Ministry of Aeronautics and Astronautics. Derating criteria for electrical, electronic and electromechanically parts: GJB/Z 35—1993［S］.Beijing: Commission on Science, Technology, and Industry for National Defense of the People’s Republic of China, 1994: 1-18.
［3］郭振铎, 郭炳, 赵凯. 电子元器件降额设计研究［J］.电子技术与软件工程, 2016(1): 257-258.
GUO Zhenduo, GUO Bing, ZHAO Kai. Study on derating design of electronic components［J］. Electronic Technology & Software Engineering, 2016(1): 257-258.
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