Shin Hanul Unit 2 Reaches 100% Output After Completing First Scheduled Preventive Maintenance

Strengthening Power Plant Safety
Establishing a Sustainable Power Supply System

Hanul Nuclear Power Headquarters of Korea Hydro & Nuclear Power (headed by Lee Seyong) announced that Shin Hanul Unit 2 (pressurized water reactor, 1.4 million kW class), which began scheduled preventive maintenance on April 20, resumed power generation on August 23 and reached 100% output at around 7:15 a.m. on August 26.

The reportable incident that occurred at Shin Hanul Unit 2 in March was due to two independent issues: a system water leak caused by a defect in the reactor coolant pump seal water injection piping, and an inert gas leak into the auxiliary building air purification system. The causes of these incidents were investigated and follow-up measures were completed as follows.

The reactor coolant pump seal water injection piping, which was damaged due to the inflow of high-temperature water, was replaced with new piping. Non-destructive testing of the welds and other areas confirmed that the relevant technical standards were met. In addition, the procedure for draining coolant samples was improved to prevent inert gas from leaking into the auxiliary building through the air vent, and subsequent inspections confirmed that there were no further leaks.

The Nuclear Safety and Security Commission reviewed the above improvements and determined that the inspection items and results met the required standards, thereby approving reactor criticality.

Furthermore, during the scheduled preventive maintenance period, Hanul Headquarters thoroughly performed fuel replacement, regular inspections, and maintenance of equipment, and completed all statutory inspections in accordance with the Nuclear Safety Act.

Going forward, Hanul Headquarters will continue to transparently disclose all matters related to the power plant at all times and will do its utmost to ensure safe operation of the facility.

Shin Hanul Unit 2.

This content was produced with the assistance of AI translation services.