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Handling of Overproof Horizontal Displacement of the Expansion Joint for the Reheater in Nuclear Power Station

HOU Jing-hong(Procurement Center of Complete Sets of Equipt,China Nuclear Power Engineering Co.,Ltd.,Shenzhen,Guangdong 518124,China)  
Under the working condition of the expansion joint in the drain line of moisture separator reheater(MSR for short) in Power Unit 1 in a nuclear power station,it was found that the horizontal displacement of expansion joint located in drain pipes of MSR exceeded the requirement of the design specification.If it is not promptly resolved,the operation of the unit will have risks.After the installation of Unit 2 in the power station is completed,the similar situation of horizontal displacement also exists in the MSR expansion joint.To solve these problems,multiple measures and analysis on the cause have been carried out.It is found that the problems may exist in vertical control of the expansion joint during the application assembly of similar expansion joint.which has some reference for vertical control in China.
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