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First Backup Emergency Diesel Generator of Hualong One Officially Available at Sanao Nuclear Power Unit 2

On October 2, the first backup emergency diesel generator (9LHW) of Hualong One completed the replacement grid connection test at Sanao Nuclear Power Unit 2 and was officially put into service. The equipment can replace any one of the original 12 emergency diesel generators (EDGs) in Phase I and Phase II projects, significantly improving the redundancy, reliability, and maintenance flexibility of the plant's emergency power supply. Sanao Nuclear Power Phase I and Phase II each have 3 emergency busbars, with one EDG configured for each busbar. However, due to the absence of cross-power supply for loads, the preventive maintenance windows of the original units were concentrated, affecting the overhaul schedule. Since 2021, Cangnan Nuclear Power has promoted the project of adding backup diesel generators, improving from the design source, building a new backup emergency diesel generator building (BDD), and constructing corridors and cables connected to each unit...

2026-10-03

Investigation to Be Conducted into Emergency Diesel Generator Failure at Unit 6 of Japan's Kashiwazaki-Kariwa Nuclear Power Plant

Tokyo Electric Power Company announced that it will investigate the failure of the emergency diesel generator at Unit 6 of the Kashiwazaki-Kariwa Nuclear Power Plant in Niigata Prefecture, Japan. The unit was restarted after 14 years of shutdown and resumed commercial operation in April this year. According to Tokyo Electric Power Company, in July this year, workers discovered that water had mixed into the lubricating oil of the emergency diesel generator at Unit 6. Subsequent inspections confirmed that there was a water leak in the cylinder head, a component of the generator engine. The company therefore determined that the unit currently does not meet the operational safety specification requirements. Tokyo Electric Power Company stated that it plans to complete the relevant repair work by September 19. If the repair cannot be completed by then, the cause of the failure will be further investigated, and measures may include shutting down the reactor for inspection.

2026-09-11

Ukraine's Zaporizhzhia Nuclear Power Plant says restoring second external power line is critical to nuclear safety

On September 7, the Zaporizhzhia Nuclear Power Plant stated that restoring and commissioning the second external power transmission line—the 750 kV Dniprovska line—is critical to improving the reliability of the plant's power supply and enhancing nuclear and radiation safety levels. The plant also proposed that a systematic supply of fuel for backup diesel generators needs to be ensured. The Zaporizhzhia Nuclear Power Plant stated that after the 330 kV Ferrospravnaya-1 transmission line restored external power supply, the radiation conditions at the plant and surrounding areas remained stable, within the range of natural background levels. The plant also stated that following the restoration of external power supply, the backup diesel generators have been switched to standby mode. In its statement, the plant said that the Ferrospravnaya-1...

2026-09-09

First Emergency Diesel Generator Successfully Introduced at Unit 6 of Lufeng Nuclear Power Plant

On September 4, 2026, the first emergency diesel generator for Unit 6 of Lufeng Nuclear Power Plant was successfully introduced into the diesel generator building. The emergency diesel generator is a critical required power source during the cold test phase of a nuclear power unit. The successful introduction of this equipment ensured the availability of emergency power during the cold test period, providing a solid power guarantee for the smooth execution of subsequent cold test work for Unit 6. The Installation Management Section of Lufeng Nuclear Power shifted from passive waiting to proactive action, planning the diesel generator introduction route in advance. The greatest challenge of this introduction task was the deep pit backfill adjacent to the main area of the siphon well on the west side of the diesel generator building, with a backfill depth exceeding 20 meters, a wide coverage area, and a graded aggregate demand of up to approximately 80,000 cubic meters. During construction...

2026-09-08

External power supply interruption at Zaporizhzhia Nuclear Power Plant has lasted for 14 days

Yashina, head of communications at the Zaporizhzhia Nuclear Power Plant, stated that the external power supply interruption at the plant has lasted for 14 days, with power currently provided by diesel generators, and that on-site personnel are still able to ensure the safe condition of the plant. According to an earlier statement from the plant, on August 20, the "Ferroalloy-1" power line was damaged, causing the external power supply interruption at the Zaporizhzhia Nuclear Power Plant. The damage site is located in an area where repair work cannot currently be carried out. After the loss of external power, the plant activated its backup power system. Fuel reserves remain available on site, but to conserve these reserves and maintain stable equipment operation, the operating mode of the diesel generators needs to be optimized. Yashina stated that the plant has been powered by diesel generators for 14 consecutive days...

2026-09-03

Zaporizhzhia Nuclear Power Plant Relies on Emergency Diesel Generators to Maintain Operations

The International Atomic Energy Agency (IAEA) recently stated that the Zaporizhzhia Nuclear Power Plant (ZNPP) has been relying on emergency diesel generators to maintain critical safety systems for over a week following the interruption of its external power supply. After inspections by the agency's on-site expert team, it was confirmed that as of the 23rd local time, the plant's diesel reserves could support approximately 10 days of operation, approaching the minimum regulatory requirement. According to the IAEA, the Zaporizhzhia Nuclear Power Plant lost its connection to the only remaining 330 kV Peresopravna-1 external transmission line starting on the 20th. Subsequently, the plant activated multiple emergency diesel generators to power critical equipment, including the six reactors and pumps related to spent fuel cooling and storage. The IAEA...

2026-08-31

Zaporizhzhia Nuclear Power Plant Loses External Power for Six Days

On August 25 local time, the Zaporizhzhia Nuclear Power Plant (ZNPP) stated that it had lost external power since August 20 and had been relying on backup diesel generators to meet on-site electricity demand for six consecutive days. The plant's existing fuel reserves can still ensure operation, but difficulties in fuel resupply have not yet significantly eased. Yevgeniya Yashina, head of communications at ZNPP, stated that plant staff are monitoring nuclear safety parameters and the operation of backup diesel generator units around the clock. She noted that fuel transportation still faces difficulties due to shelling on roads leading to the plant; to improve the efficiency of existing reserve utilization, the plant has optimized the operation of diesel generators...

2026-08-26

Investigation Underway into Cause of External Power Supply Interruption at Zaporizhzhia Nuclear Power Plant

On August 20, Chernichuk, the head of the Zaporizhzhia Nuclear Power Plant, stated that the cause of the external power supply interruption at the plant is still under investigation, with relevant experts inspecting transmission lines to identify possible fault points. Chernichuk noted that the specific cause and location of the line damage remain unclear. Experts from the plant are conducting inspections along the lines to locate the fault; according to Ukrainian sources, their experts are also carrying out related inspection work. Earlier, the Zaporizhzhia Nuclear Power Plant reported that due to the interruption of the external power supply line, the plant switched to the backup power supply system on the morning of the 20th and activated diesel generators. The report also stated that the 330 kV high-voltage transmission line "Ferroalloy-1" was disconnected from the Zaporizhzhia Nuclear Power Plant due to damage...

2026-08-21

Repeated Power Outages at Zaporizhzhia Nuclear Power Plant Raise Concerns over Equipment Aging and Safety Risks

August 13 news, the issue of repeated interruptions to the external power supply at the Zaporizhzhia Nuclear Power Plant continues to draw attention. Relevant data shows that since February 2022, the plant has experienced 26 power outages, 14 of which occurred in the first 8 months of 2026. The Zaporizhzhia Nuclear Power Plant is the largest nuclear power plant in Europe. Once the external power supply is interrupted, the plant must switch to backup power to maintain the operation of essential safety systems. Frequent switching of power supply modes not only increases operational pressure but also poses additional risks to nuclear safety and radiation safety. Relevant parties have stated that signs of equipment aging at the Zaporizhzhia Nuclear Power Plant are intensifying, with the condition of diesel generator sets being particularly concerning. The backup diesel generator sets are generally...

2026-08-15

Zaporizhzhia Nuclear Power Plant Launches Major Overhaul of Damaged Diesel Generator

On August 14 local time, the Zaporizhzhia Nuclear Power Plant (ZNPP) stated that it has launched a major overhaul of a damaged diesel generator unit to ensure the plant's independent power supply capability in the event of an external power outage. The plant stated that maintenance work is currently progressing as planned, with a focus on the upkeep and repair of equipment related to safety systems. The diesel generator unit under repair is one of the independent power sources for the safety systems. Previously, during a complete interruption of external power supply, the backup diesel generator units provided power support for the plant to maintain essential safety functions. According to reports, experts on site have begun disassembling and inspecting the main components of the diesel generator unit to determine which parts need replacement or repair...

2026-08-15