Requalification Experimental Study on Life Extension of Electrical Instrument Equipment in Nuclear Power Plant
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摘要: 在核电厂电气仪表设备（简称电仪设备）环境鉴定研究成果的基础上，开展核电厂电仪设备延寿再鉴定分析和试验研究。以秦山第一核电厂DDG-1型电气贯穿件（EPA）为研究对象，根据运行实际制定了再鉴定试验研究的遵循原则，在此原则下结合分析法确定了试验方案和试验项目序列以及EPA修复依据和方案，并在此基础上开展再鉴定试验研究。适当修复后的DDG-1型EPA按试验大纲依次通过了设备性能随时间变化的试验、抗震试验、设计基准事故（DBA）条件下热力学试验和DBA后极限电性能试验，试验后状态完好，表明该DDG-1型EPA经适当修复后能够完成继续延寿20 a的预期目标，可为核电厂其他电仪设备再鉴定试验研究提供指导和借鉴。
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关键词:
- 核电厂 /
- 电仪设备 /
- 电气贯穿件（EPA） /
- 延寿 /
- 再鉴定
Abstract: On the basis of the research results of environmental qualification of electrical instrument equipment in nuclear power plant, the life extension requalification analysis and experimental research of electrical instrument equipment in nuclear power plant are carried out. Taking the DDG-1 electrical penetration assembly (EPA) of Qinshan Nuclear Power Co., Ltd. as the research object, the principles for requalification experimental study are formulated according to the actual operation. Based on these principles, the test scheme, test item sequence and EPA repair basis and scheme are determined by combining the analysis method, and requalification experimental study is carried out on this basis. The properly repaired DDG-1 EPA passed the test of equipment performance with time, seismic test, thermodynamic test under design basis accident (DBA) conditions and ultimate electrical performance test after DBA in sequence according to the test scheme. Its state is intact after the test, which indicates that the DDG-1 EPA can achieve the expected goal of continuing to extend its life for 20 years after proper repair, and can provide guidance and reference for the requalification experimental study of other electrical instruments in nuclear power plants. -
图 2 导体组件绝缘电阻变化趋势
Figure 2. Variation Trend of Insulation Resistance of Conductor Assembly
表 1 DDG-1型 EPA延寿再鉴定试验序列
Table 1. Life Extension Requalification Test Sequence of DDG-1 EPA
序号 试验项目 1 基本性能检测试验 2 设备性能随时间变化的试验 加速热老化 辐照老化 3 抗震试验 4 DBA条件下热力学试验 5 DBA后极限电性能试验 额定短时过负荷电流 额定短路电流 额定短路热容量 
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表 2 额定短时过负荷电流试验结果
Table 2. Test Results of Rated Short-Time Overload Current
试验部位 短时过负荷电流/A 持续时间/s 环境温度/℃ A相 1417 10.3 135.2 B相 1472 10.7 135.3 C相 1475 10.2 135.5
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表 3 额定短路电流试验结果
Table 3. Test Results of Rated Short Circuit Current
试验部位 电流峰值/kA 持续时间/ms A相 45.22 42.82 B相 45.92 C相 55.34
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表 4 额定短路热容量试验结果
Table 4. Test Results of Rated Short Circuit Heat Capacity
试验
部位试验电流/kA 短路热容量/(A2·s) 持续时间/s 有效值 峰值 A相 15.18 33.47 2.379×108 1.034 B相 15.43 31.07 2.458×108 C相 15.17 34.18 2.373×108
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