A Case Diagnose of Loose Part for MCP Blade in TNPS Unit 1
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摘要: 对田湾核电厂松脱部件监测系统(LPMS)监测到的1号机组的松脱部件报警事件信号进行诊断分析。诊断认为引发这些的报警信号的事件发生在4号主泵附近,是由于4号主泵或其附近有松动件或动静摩擦导致的,不是脱落件。根据分析结果和检修建议,在田湾核电厂1号机组第1次大修(T101)期间,对4号主泵进行检查并对压力容器底部进行目视检查,发现4号主泵叶轮叶片母材脱落,脱落的叶片在压力容器底部找到。该事件的分析诊断说明,LPMS的有效监测和专家诊断分析对核电厂检修具有重要的指导作用。Abstract: An alarm event of loose part monitored by LPMS of unit 1 in TNPS was analyzed and diagnosed using the off line-analysis software of LPMS.The diagnosis conclusion was made that the events lied in or near by the main pump of loop 4 and the event was not a loosed part but may was a loosing part or dynamic to static friction.According to the overhaul suggestion,an inspect to the main pump of loop 4 and an explore to the bottom of pressure vessel were putted in practice in the time of T101 overhaul for unit 1,and it was found that a lamina of the impeller of the main pump of loop 4 was broken off and the lamina was found on the bottom of the pressure vessel.So the diagnosis was proved correctly.It shows that the effective moni-toring and the professional diagnosis to loose part play an important role in overhaul of nuclear power plant.
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Key words:
- Loose part /
- Diagnose /
- Maintenance guide
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