核电厂屏蔽主泵安装焊接技术研究

Study on the Installation and Welding Technology of Reactor Canned Coolant Pump in Nuclear Power Plant

作为核主泵的泄漏防护屏障,CANOBY密封环的焊接质量关乎核电厂的安全运行。结合ASME焊接规范,针对密封环焊接工艺评定的制定思路、执行标准、重要变素以及焊工资质评定进行分析研究。根据核主泵的安装逻辑,提出了一种施工工艺进行验证。结果表明,ASME BPVCⅢ-NB分卷的特殊要求是对ASME BPVC IX卷重要变素的重要补充,两者结合起来是保证焊接工艺评定正确开展的前提。分阶段焊接密封环焊缝的施工工艺行之有效,焊接过程得到良好控制,保障了核主泵焊接质量一次性合格。

The welding quality of CANOBY the seal ring,which is the leakage protective barrier for the reactor coolant pump,directly affects the nuclear safety of the nuclear power plant.In combination with the ASME welding specification,the paper analyses and studies the development thought,the implementation standard,the essential variables and the qualification of the welder for the sealing ring welding process qualification.According to the installation logic of the reactor coolant pump,one construction technology was proposed for verification.It turns out that the special requirements of ASME BPVC III-NB volume are an important supplement to the essential variables of ASME BPVC IX,and the combination of the two is the premise to ensure the correct development of welding process qualification.The construction technology of sealing ring welding by stage is proven to be effective,and the welding process is well controlled,which ensures that the welding quality of the reactor coolant pump was qualified with a one-off effort.