en.Wedoany.com Reported - Unit 4 (1,000 MW pressurized water reactor) of the Hanul Nuclear Power Plant, located in Uljin County, Gyeongsangbuk-do, South Korea, ceased power generation at 10:00 AM on May 18 to begin planned preventive maintenance, with the maintenance period expected to last approximately 61 days. During this period, the unit will undergo routine inspections by the Nuclear Safety and Security Commission.

According to the Hanul Nuclear Power Plant headquarters, this preventive maintenance will involve the maintenance and inspection of major equipment, specifically including fuel removal and reloading, replacement of DBA control rod assemblies (full steel rods) and PARs, installation of the main generator circuit breaker (GCB), and improving the fire resistance of fire barriers to further enhance nuclear safety.

The South Korean Nuclear Safety and Security Commission will focus on the following areas during this routine inspection: reactor vessel operation inspection (verifying the applicability of the reactor head replacement), containment combustible gas control system (verifying the applicability of PAR replacement under design basis accidents), containment operation inspection (verifying the integrity of inspection targets), main generator circuit breaker (verifying the applicability of GCB replacement), and fire protection system (verifying the applicability of fire protection structures).

The Hanul Nuclear Power Plant headquarters stated that it plans to resume power generation in July, following statutory inspections under the Nuclear Safety Act, obtaining approval for operation from the Nuclear Safety and Security Commission, and confirmation of compliance by the regulatory body.

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