Root Cause Analysis for Micro-Governor Valve Module DC-DC Converter Failure in Daya Bay Nuclear Power Station
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摘要: 大亚湾核电站2号机组曾多次发生汽轮机电液控制阀门模块内部直流调压块烧损事件,本文对该模块烧损的原因进行了分析。结果表明,导致汽轮机电液控制阀门直流调压块烧损的主要原因是:内部三极管质量有缺陷、阀门模块的结构过于紧凑,以及其控制机柜通风散热不良导致三极管长期在过热的情况下运行。针对故障原因采取了有效的纠正行动。Abstract: Root cause analysis about DC-DC converter failure in Micro-governor valve module in unit 2 of Daya Bay Nuclear Power Station revealed that poor quality of the transistor material inside the converter,poor thermal design of the valve modules and insufficient ventilation to the cabinet resulted in the aging of converter after long-term operation.Followed correction action had been suggested and implemented on site.
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Key words:
- Daya Bay nuclear power station /
- Turbine /
- Valve module /
- DC-DC converter /
- Transistor /
- Aging
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