On April 21, 2026, Kioxia Corporation announced the immediate suspension of production at its primary NAND flash memory manufacturing site in Kitakami, Iwate Prefecture. The decision follows a magnitude 7.7 earthquake that struck off the coast of northeastern Japan at approximately 10:30 AM local time. The company confirmed that the shutdown is a precautionary measure to allow for comprehensive safety inspections and the recalibration of precision manufacturing equipment that is highly sensitive to seismic vibrations.
The Kitakami facility, which includes the K1 and K2 fabrication plants, is a cornerstone of Kioxia’s production of advanced 3D NAND flash memory. These units utilize the company’s proprietary BiCS FLASH technology, which requires extreme stability during the layering and etching processes. According to an official statement from Kioxia, the earthquake triggered automated safety systems that safely ramped down power to the cleanrooms. Engineers are currently conducting a detailed assessment of the lithography tools and chemical delivery systems to identify any potential misalignments or leaks in the vacuum chambers.
The suspension of the Iwate facilities raises questions regarding the stability of the global NAND supply chain. Kioxia, which operates these plants in a joint venture with Western Digital, has not provided a definitive timeline for the resumption of operations. A critical factor in the recovery process will be the status of the work-in-progress (WIP) wafers that were inside the machines at the time of the tremor. In semiconductor manufacturing, sudden power fluctuations or physical shocks can lead to the contamination or destruction of entire batches of wafers, potentially resulting in weeks of lost production volume if the wafers must be scrapped.
While Kioxia assesses its facilities, other major participants in the semiconductor ecosystem report a more stable outlook. Tokyo Electron (TEL), a primary supplier of semiconductor production equipment, stated that its manufacturing and research centers in the nearby Miyagi Prefecture did not suffer structural damage and are continuing operations. Furthermore, silicon wafer manufacturers Shin-Etsu Chemical and SUMCO reported that their production lines in the Tohoku region remain functional. These companies noted that while their facilities are designed with advanced seismic damping technology, they are conducting routine checks to ensure that no micro-fractures occurred in their high-purity quartz components or silicon ingot growth chambers.
Regional infrastructure impacts are also being monitored to determine the speed of recovery. Japan Railways suspended several lines of the Tohoku Shinkansen to inspect tracks, which may affect the movement of specialized technical personnel and components. Kioxia has confirmed that all employees at the Kitakami site are accounted for and no injuries have been reported. The company is expected to issue a technical report within the next 48 hours detailing the condition of the K1 and K2 cleanrooms and the estimated impact on quarterly output.