核安全级系统是控制整个核电厂安全运行的神经中枢，其电路的核心部件为印制线路板组装件，直接影响核安全级系统运行的稳定性.以印制线路板组装件外表面清洁度为目标，分析了印制线路板装焊过程中清洗工序的必要性和重要性，以确保不会产生因清洁问题而在使用过程中表面绝缘电阻下降以及因离子残留导致的电化学迁移等可靠性问题.通过几种清洗溶剂的调查对比和试验分析，确定了最适用于核级印制线路板组装件清洗的溶剂材料.

Nuclear safety level system is the nerve center of whole nuclear power plant for safe operation control. The core component of circuit is printed circuit board assembly that directly affecting about its operation stability. This article aims at the surface cleanliness of the printed circuit board assemblies, and analyzes the necessity and importance of cleaning process in the production process of printed circuit board assembly, so as to ensure that there will not be reliability problems such as the decrease of surface insulation resistance and electrochemical migration caused by ion residue during using due to cleaning problems. Through the investigation comparison and experimental analysis of several cleaning solvents, the most suitable solvent materials for cleaning nuclear level printed circuit board assembly are determined.