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首页> 外文会议>Material Degradation and Related Managerial Issues at Nuclear Power Plants >SUMMARY OF THE INTERIM REPORT ON THE SECONDARY SYSTEM PIPE RUPTURE AT UNIT 3, MIHAMA NUCLEAR POWER PLANT
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SUMMARY OF THE INTERIM REPORT ON THE SECONDARY SYSTEM PIPE RUPTURE AT UNIT 3, MIHAMA NUCLEAR POWER PLANT

机译：MIHAMA核电站3号机组二次系统破裂的中期报告摘要

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摘要

The Nuclear and Industrial Safety Agency of Japan, through the Accident Investigation Committee, has been conducting an investigation into the secondary system pipe rupture at Unit 3 of the Mihama Nuclear Power Plant, which occurred on 9 August 2004. The interim report was publicized on 27 September 2004, while further detailed analytical investigation is expected. A secondary side carbon steel pipe ruptured. Thinning had developed at the downstream of an orifice due to the combination of erosion caused by the mechanical action of the internal water flow and corrosion caused by chemical reaction. The pipe had gradually lost its thickness, which led to a loss of strength and eventually to a rupture from internal pressure. The investigation has revealed that the dimple pattern typical in this kind of phenomenon was found on the inner surface of the pipe.
机译：日本核工业安全局通过事故调查委员会一直在调查2004年8月9日发生的美滨核电厂3号机组的二次系统管道破裂。临时报告于27日公布。预计在2004年9月进行进一步详细的分析调查。次级侧碳钢管破裂。由于内部水流的机械作用引起的腐蚀和化学反应引起的腐蚀相结合，在孔口的下游出现了稀疏现象。管道逐渐失去厚度，导致强度损失，最终因内部压力而破裂。调查表明，在管子的内表面发现了这种现象的典型凹痕图案。

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