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Successful Hoisting of Module 3 of the Passive Containment Cooling Water Tank for Unit 4 of Zhangzhou Nuclear Power Plant

On August 15, the hoisting of Module 3 of the passive containment cooling water tank in the reactor building of the nuclear island of Unit 4 at Zhangzhou Nuclear Power Plant was successfully completed, with the entire hoisting process being safe and quality-controlled. The passive containment cooling water tank is an important component of the passive part of the containment cooling water injection system. With a total height of 22.02 meters, it features a non-uniform cross-section in an approximately fan-shaped structure and is planned as three integral modules. Module 3, hoisted this time, had a total lifting weight of approximately 132.8 tons and a height of 5.84 meters, and was positioned using a 2000-ton-class crawler crane. As the crane slowly lifted the module, through a series of precise operations including hook lifting, boom slewing, crane traveling, and luffing, Module 3 was smoothly placed onto Module 2 of the passive containment cooling water tank, with the entire process proceeding seamlessly...

2026-08-17

Concrete Placement of the 16.5m Slab in the Reactor Building of Unit 4 at Zhangzhou Nuclear Power Plant Successfully Completed

At 21:58 on August 13, the concrete placement of the 16.5m slab in the internal structure of the reactor building of Unit 4 at Zhangzhou Nuclear Power Plant was successfully completed, with safety and quality under control throughout the process, laying a solid foundation for subsequent key path milestones such as crane availability and inner dome lifting. As the core load-bearing structure within the reactor building, the 16.5m slab of the internal structure serves as the critical support platform for the introduction, positioning, and installation of subsequent large-scale core equipment. The engineering structure features key challenges including large construction volume, staggered elevation differences, modular structural rebar installation, and high-precision installation of owner-supplied items, imposing extremely high requirements on overall construction organization, safety, and quality control. The total concrete volume placed this time was 2,297 cubic meters, with a continuous placement duration of 30.5 hours.

2026-08-15

Unit 4 of Slovakia's Mochovce Nuclear Power Plant Reaches First Criticality

Slovenské Elektrárne stated that Unit 4 of the Mochovce Nuclear Power Plant reached first reactor criticality at 22:10 local time on August 6, and achieved minimum controllable power at 22:31. This is a key milestone in the pre-commissioning work of the unit, indicating that the reactor is ready for subsequent testing. First criticality refers to the first time the nuclear fuel in the core achieves a self-sustaining fission chain reaction. Slovenské Elektrárne stated that first criticality and reaching minimum controllable power are important steps in the commissioning process of a nuclear power plant, used to confirm the unit's readiness to enter the next phase of testing...

2026-08-08

Huaneng Hainan Changjiang Nuclear Power Plant Unit 4 Secondary Loop Combined Hydrostatic Test Successfully Completed

At 04:29 on August 6, 2026, witnessed jointly by Huaneng Changjiang Nuclear Power Company and all participating construction units, the secondary loop combined hydrostatic test of Unit 4 was completed, laying a solid critical prerequisite foundation for the comprehensive implementation of subsequent cold functional tests of the unit. Hydrostatic test curve diagram The secondary loop hydrostatic test is the core critical test following the blasting purging process in the unit's secondary loop system, and constitutes a mandatory acceptance procedure during the construction and installation phase of the Hualong One nuclear power unit. The test primarily targets the steam generator secondary side system, main steam pipelines, feedwater system, auxiliary valves, supports and hangers, and all associated piping, comprehensively verifying the overall structural pressure resistance, weld and flange sealing performance, and...

2026-08-07

Construction of inner containment begins at Unit 4 of Leningrad Nuclear Power Plant II

Construction of the inner containment of the reactor building at Unit 4 of the Leningrad Nuclear Power Plant II in Russia has commenced. The unit features a VVER-1200 reactor, and the inner containment is a key component of the unit's passive safety system, as well as part of the plant's confinement safety system. Construction workers have installed the first tier of vertical sealed steel liner to its design position. The steel structure weighs approximately 97 tonnes, and the lifting and positioning operations were carried out using a heavy crawler crane, with the entire installation process lasting about 7 hours. The contractor, TITAN-2 Holding Company, stated that the preparatory work took several months, including component fabrication, protective coating application, on-site assembly and welding, and structural quality inspection...

2026-08-06

Lifting of Steel Liner Module 1 for Unit 4 of Guangdong Taipingling Nuclear Power Plant Successfully Completed

A key construction milestone was reached at the Guangdong Taipingling nuclear power construction site, where the 2,000-tonne crawler crane of CNNC Machinery Engineering precisely completed the lifting and positioning of Steel Liner Module 1 for Unit 4 of Guangdong Taipingling Nuclear Power Plant. The entire lifting operation lasted 2 hours and 12 minutes, with smooth and orderly lifting, lowering, and slewing movements, and strict control over safety and quality throughout the process, marking the official commencement of main structure construction for the nuclear island reactor building. As the core barrier of the reactor containment, the steel liner module safeguards the nuclear safety defense line, and modular lifting is also a key technical step in the batch construction of Hualong One reactors. The steel liner module lifted this time integrates the base plate in one formed piece, featuring a large diameter, thin shell wall, and relatively low stiffness...

2026-08-04

Danube water levels continue to decline, Unit 4 of Hungary's Paks Nuclear Power Plant reduces power output

Affected by persistent drought, water levels of the Danube in Hungary have dropped to low levels, impacting the operation of the Paks Nuclear Power Plant, which relies on Danube water for cooling. The plant's operator announced on July 31 that, due to a further drop in the water level at the Paks section to -126 cm, experts would reduce the power output of Unit 4 by 50% starting from 22:45 local time on July 31. The Paks Nuclear Power Plant is Hungary's only operating nuclear power plant, generating approximately half of the country's total electricity. Earlier announcements had mentioned that, due to the extremely low Danube water level, shutdowns of some units at the plant had become difficult to avoid. Peter Magyar stated on social media on July 30...

2026-08-01

On-site assembly of the 50MW heat exchange station for Unit 4 of Xudabao Nuclear Power Plant successfully completed

On July 30, the 50MW heat exchange station for Unit 4 of Xudabao Nuclear Power Plant completed on-site assembly, providing solid equipment support for heating in the front plant area this winter. The heat exchange station measures 16 meters in length, 9 meters in width, and 7.4 meters in height, with a total weight of 150 tons. The equipment integrates heat exchangers, circulating water pumps, water treatment devices, and electrical control instruments, forming a complete integrated heating system. The system is arranged on the zero-meter floor of the turbine hall and is responsible for heating the office areas in the front plant area. To ensure the winter heating milestone, the Equipment Procurement Division of Liaoning Nuclear Power, together with the on-site Equipment Department of the engineering company, equipment manufacturers, and installation units, established a special working group, implementing mechanisms such as weekly leadership meetings, daily morning briefings for teams, and daily progress reports, and successively coordinated and resolved issues related to equipment transportation, pipeline hoisting, scaffold erection and dismantling, power supply assurance, and cross-construction coordination, completing all assembly work of the heat exchange station as planned.

2026-07-31

Unit 4 of Leningrad NPP Phase II completes installation of first major equipment

Unit 4 of Russia's Leningrad NPP Phase II recently completed the installation of the core melt catcher vessel. This is the first major equipment of the unit to enter the installation stage, and also the first passive safety system equipment to be installed. The steel structure weighs 157 tonnes, and the installation was carried out using a heavy crawler crane, taking about one work shift of approximately 8 hours, nearly 3 months ahead of the original schedule. Valery Zhemchugov, Acting Director of Leningrad NPP, stated that the installation of the core melt catcher vessel is a key milestone in the construction of Unit 4, a VVER-1200 pressurized water reactor unit, and that the relevant work was completed in accordance with quality requirements, providing more time for subsequent reactor building civil and installation works.

2026-07-31

The steam-blowing operation for the secondary-circuit main steam piping of Hainan Changjiang Nuclear Power Unit 4 has been successfully completed.

On July 23, the "shock blow" cleaning operation for the secondary-circuit main steam piping of Unit 4 at the Hainan Changjiang Nuclear Power Plant—undertaken by China Nuclear Industry Fifth Construction Co., Ltd.—was successfully completed. The

2026-07-27