A Verticality Adjustment Technology for AP1000 Refueling Machine Mast

Abstract

The refueling machine is used to handle the nuclear fuel assembly in the nuclear island, and is used to transport fuel between the fuel upender basket and reactor vessel core. During Unit 1 of a nuclear power plant initial fuel loading, it was found that the inner mast operated with large friction, which caused frequent triggering of overload protection during fuel operation, and the refueling machine was difficult to be operated normally. According to the unique design characteristics of the inner mast of the AP1000 refueling machine, the verticality adjustment method of the mast of the AP1000 refueling machine is developed. By adjusting the verticality of the outer mast, the concentricity of the inner and the outer mast, the levelness of the equilibrium arm of the inner mast, and the gap between the guide roller of the outer mast and the inner mast, the problem of high friction in the operation of the inner mast is solved. At the same time, the verticality of the inner mast during operation is ensured. This method has been successfully applied in the first overhaul of a power plant. It can be used to guide the installation and adjustment of the refueling machine mast with similar structure.

Keywords

• refueling machine
• mast
• verticality
• total station