The Tokai Second Nuclear Power Plant reported no equipment abnormalities following an earthquake that struck Japan on June 21, 2024 [1].
Ensuring the stability of nuclear infrastructure is critical during seismic events in Japan, where strict safety protocols are required to prevent radiological leaks and ensure public safety.
The earthquake occurred at approximately 10:06 a.m. [2]. In Ibaraki Prefecture's Tokai Village, where the plant is located, a seismic intensity of three was observed [3]. Other regions experienced more significant shaking, with Gunma and Saitama prefectures recording a maximum seismic intensity of 5-lower [3].
Japan Atomic Power Company, the operator of the facility, confirmed that monitoring posts surrounding the plant showed no changes in radiation levels [1]. The company said that the plant was not in operation at the time of the quake because it was undergoing a periodic inspection [1].
"Tokai Second Nuclear Power Plant was not in operation because it was undergoing a periodic inspection, and no equipment abnormalities due to the earthquake have been confirmed," a spokesperson for Japan Atomic Power Company said [4].
Plant officials conducted checks to ensure that the facility's integrity remained intact despite the tremors. Because the reactors were offline for maintenance, the risk of a primary system failure was significantly reduced during the event [1]. The company continues to monitor the site for any delayed effects of the seismic activity [1].
“The Tokai Second Nuclear Power Plant reported no equipment abnormalities”
The lack of damage is largely attributed to the plant's inactive status during its periodic inspection. When reactors are not operating at capacity, the thermal and pressure stresses on the core are lower, reducing the likelihood of a critical failure during a seismic event. This incident reinforces the importance of scheduled maintenance windows in mitigating risk during Japan's frequent geological activity.
