On April 2, the first reactor coolant pump for the nuclear island of Unit 3 of Sanmen Nuclear Power, a subsidiary of China National Nuclear Power, was hoisted into steam generator chamber B and positioned on the pump installation trolley, beginning subsequent pump installation work. This marks that installation of the reactor coolant system in the nuclear island of Unit 3 has entered a critical phase, laying a solid foundation for subsequent system commissioning.

Unit 3 of Sanmen Nuclear Power adopts the CAP1000 reactor type and contains four vertical, single-stage, high-inertia centrifugal canned reactor coolant pumps, each installed in the pump casing at the bottom of a steam generator. Their main function is to circulate the reactor coolant among the reactor core, coolant loops, and steam generators.

During this hoisting operation, the minimum clearance between the pump and the edge of the steam generator chamber was only on the order of millimeters. In response to challenges such as the narrow pump passage, numerous interference items, and the large fleet angle of the polar crane wire rope, Sanmen Nuclear Power carried out 3D scanning and modeling in advance, identified and removed interference items, and conducted multiple on-site hoisting verifications with pump mock-ups, strictly controlling on-site safety and quality.

To ensure successful hoisting on the first attempt, Sanmen Nuclear Power, together with all participating construction units, implemented the group company's high-quality and refined project management requirements of the "Six Major Controls and Seven Zeros." Under the unified command of the Phase II Project Command Center (PCC), it implemented "Six Ones" integrated project management and organized all units to establish a joint working group for pump installation. Through installation sandbox rehearsals, live simulations, and regular meetings, risks and constraints in the preparatory work were identified and resolved in a timely manner, ensuring the hoisting and positioning of the first reactor coolant pump of Sanmen Nuclear Power Phase II Project.