Hanul Nuclear Power Plant Unit 6 Reactor Automatically Shutdown Due to Incorrect Signal (Comprehensive)

[Image source=Yonhap News]

[Asia Economy Reporter Moon Chaeseok] Korea Hydro & Nuclear Power Hanul Nuclear Power Headquarters announced that at around 12:05 PM on the 19th, Hanul Nuclear Power Plant Unit 6 (Pressurized Water Reactor type, 1 million kW class) automatically shut down after the reactor coolant pump stopped due to a false signal during the replacement of the PCS card.

The PCS card is a card that transmits signals to the power plant control system. It plays a role in sending stop signals to the reactor coolant pump and other equipment in case of abnormal plant conditions or false signals.

A KHNP official said, "We are currently analyzing the cause," adding, "There was no external radiation leakage due to this shutdown, and the power plant remains in a safe condition."

The Nuclear Safety and Security Commission reported that it received notice of the automatic shutdown of Hanul Nuclear Power Plant Unit 6 on the same day and is currently assessing the initial situation at the local field office.

They also stated that an incident investigation team composed of experts from the Korea Institute of Nuclear Safety (KINS) has been dispatched to investigate the detailed cause.

The NSSC said, "The power plant is currently in a safe shutdown state, and radiation levels within the plant remain at normal levels," adding, "We plan to approve the reactor restart after analyzing the cause of the reactor coolant pump stoppage and reviewing KHNP's recurrence prevention measures."

Earlier, on the 4th, Hanul Headquarters manually stopped the turbine of Hanul Nuclear Power Plant Unit 2 (Pressurized Water Reactor type, 950,000 kW class) due to a decline in the secondary side feedwater system water quality, and power generation resumed on the 6th.

The turbine generator is a device that produces electricity by receiving steam generated from the steam generator, and the reactor output dropped by about 1% at that time.

There was no external radiation leakage due to the turbine shutdown at that time.

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