核电厂用超高分子量聚乙烯喷嘴研发与应用

  目的  为解决核电厂核安全3级循环水过滤系统（CFI）喷嘴冲刷磨蚀及腐蚀问题，采用超高分子量聚乙烯(UHMWPE)开发了一种耐腐蚀、耐磨的喷嘴。  方法  通过对重要加工工艺参数测试，固化了喷嘴制造加工工艺，为验证所开发的喷嘴耐磨性及水力性能，进行材料本体耐磨试验，并模拟核电厂运行条件开展基于研发产品的冲刷和水力试验。  结果  试验结果表明:UHMWPE喷嘴的耐磨性能优异，高于传统材料；可以适应核电厂高速冲刷的需求，水力性能亦可满足核电厂的要求。  结论  UHMWPE喷嘴投入运行一年半，经持续运行，喷嘴未发现冲刷变形和腐蚀现象，运行效果优异。因此，采用超高分子量聚乙烯材料制备核电厂CFI系统喷嘴是可行的，可替代原有的进口尼龙喷嘴。

Development and Application of UHMWPE Nozzle for Nuclear Power Plant

  Introduction  The paper aims to develop a corrosion resistant and wearable ultrahigh molecular weight polyethylene(UHMWPE) nozzle in order to solve the nozzle erosion and corrosion problems of circulating water filtration system(CFI) which is nuclear safety grade 3 system in nuclear power plant.   Method  Through the test of important processing parameters, the nozzle manufacturing process was confirmed. In order to verify the wear resistance and hydraulic performance of the developed nozzle, the wear resistance test of the material was carried out and the scour test and hydraulic test using developed nozzles also have been done.   Result  Test results demonstrate that the UHMWPE nozzle has excellent wear resistance, which is much better than traditional materials. The UHMWPE nozzle can meet the needs of high-speed erosion of nuclear power plants, and its hydraulic performance can also meet the requirements of nuclear power plants.   Conclusion  The test results show that the performance of the UHMWPE nozzle is excellent. It has been used in the nuclear power plant for one and a half years, after continuous operation, no scour deformation and corrosion phenomena were found. Therefore, it is feasible to use it in the CFI system of nuclear power plant, which can replace the original imported nylon nozzle.