KIOXIA’s Yokkaichi Plant implements various security and disaster prevention measures, spanning both hardware and software, so as to prevent accidents and mitigate the impact of natural disasters, thereby enhancing the safety of fab operations.
We regularly hold emergency drills to ensure preparedness for any potential events so that we would be able to respond promptly and efficiently to minimize damage in the event of an emergency.

Basic Policy for Safety and Health of Yokkaichi Plant

Disaster Prevention Drills

We conduct various disaster prevention drills to be prepared for any events that could occur.

Comprehensive disaster drill Factory-wide evacuation drill simulating an earthquake that is held twice a year
Emergency preparedness drill Emergency drill simulating a disaster or abnormal situation that is held once a year at the facilities where hazardous materials or gases are used
Fire hydrant drill Drill that is held every month by the fire response team to improve the skill of using indoor fire hydrants
Fire extinguisher drill Fire drill that is held twice a year to train employees in the use of fire extinguishers
Joint fire drill Fire drill jointly held with a public fire department to simulate the experience of reporting, taking refuge, rescuing, water spraying, etc.
Comprehensive Disaster Drill

Comprehensive Disaster Drill

Fire Extinguisher Drill

Fire Extinguisher Drill

Joint Fire Drill

Joint Fire Drill

Safety Measures for High-Pressure Gases

Various high-pressure gases are used at Yokkaichi Plant.
We not only implement safety measures in accordance with the technical standards specified by the High-Pressure Gas Safety Act, including the installation of storage and handling facilities, inspection, education, and training, but also promote voluntary measures to achieve even safer fab operations.

Safety measures for equipment
All the gas facilities are equipped with a safety device to shut off the gas supply in the event of leakage.
In addition, all the production systems in the cleanroom are automated, and systems using gases are equipped with an automatic safety shutdown function coupled with a gas detector.
Furthermore, systems using gases are subject to appraisal by technical advisors prior to deployment to ensure further safety.
Daily management of equipment
At Yokkaichi Plant, we check the conditions of all gas facilities three times a day, including their pressure and temperature and the operations of gas detectors.
We also conduct voluntary inspections periodically to keep them in perfect condition as per legal requirements, which include the safety of cylinder cabinets and the operation of detox scrubbers.
Measures for enhancing management skills
We periodically hold emergency drills at the facilities where gases are used, provide employees with compliance education, invite instructors from the High Pressure Gas Safety Institute of Japan to gas safety seminars, and conduct various awareness-raising activities such as gas burning experiments. These activities are designed to enhance the management skills of engineers and other operators and to increase the number of qualified persons.
Daily Inspection of a Gas Facility

Daily Inspection of a Gas Facility

Measures for Major Earthquakes

In the event of a massive earthquake in the Nankai Trough, it is assumed that Yokkaichi would be struck by a severe tremor registering a weak 6 on the Japanese seismic scale.
Yokkaichi Plant is employing preventive measures to minimize earthquake damage.

Adoption of a base isolation system
Fab 4 completed in September 2007 and all the fabs constructed thereafter are equipped with a state-of-the-art base isolation system that reduces the vibration of the buildings during an earthquake to roughly one-fourth.
This base isolation system reduces the vibration of the building to an intensity of 3 to 4 in the event of a severe earthquake registering 6 on the Japanese seismic scale.
Base Isolation System

Base Isolation System

Adoption of the Earthquake Early Warning System
In addition to an automatic earthquake bulletin system (that automatically announces the occurrence of an earthquake to urge an initial response), Yokkaichi Plant installed an Earthquake Early Warning (EEW) system in 2008.
In the event of an earthquake, the time remaining before the arrival of a tremor and its intensity are estimated, based on an alert distributed from the Meteorological Agency and the data from an on-premises seismometer.
This estimate is used to determine whether to trigger emergency shutdown of production systems while automatically broadcasting an announcement that prompts workers to ensure their own safety.

In addition, the following measures are deployed at Yokkaichi Plant:

  • Anti-seismic measures for various systems
    Various systems are fixed onto the floor in accordance with stringent in-house rules in order to prevent secondary accidents caused by them falling or collapsing.
  • Safety confirmation system
    In the event of an earthquake, this system is used to facilitate the process of calling or emailing to determine whether all the employees and their families are safe.
  • Emergency supply storehouses
    Food reserves and tools are kept in on-premises storehouses in preparation for a major disaster.
  • Creation of manuals
    Yokkaichi Plant maintains an earthquake response manual and distributes disaster prevention cards (describing how to act in the event of an earthquake) to all employees.

Disaster Prevention Facilities

Yokkaichi Plant deploys not only the legally required fire fighting facilities but also various other disaster prevention facilities.

Ultra-High-Sensitivity Smoke detectors
For the manufacture of semiconductor memory devices, the air inside a cleanroom is constantly recirculated in order to regulate temperature and humidity and maintain a high cleanliness level.
Since the air flows downward inside a cleanroom, smoke spreads across the floor in the event of a fire. Therefore, typical ceiling smoke detectors cannot detect a fire occurring in a cleanroom.
At Yokkaichi Plant, ultra-high-sensitivity smoke detectors are installed along possible smoke paths to detect a fire early.
Ultra-High-Sensitivity Smoke Detection System

Ultra-High-Sensitivity Smoke Detection System

Deployment of a fire engine
To extinguish a fire at an early stage, Yokkaichi Plant owns a fire engine. The fire response team conducts a water-spraying drill once a month to ensure preparedness in the event of a fire.
Water-Spraying Drill of the Fire Response Team

Water-Spraying Drill of the Fire Response Team

Other Programs

Disaster prevention agreement with the city of Yokkaichi
In July 1993, Yokkaichi Plant concluded a disaster prevention agreement with the city of Yokkaichi not only to prevent accidents, fires, and other disasters in the factory but also to secure the safety of the local community.
In March 2015, Yokkaichi Plant and the city of Yokkaichi reviewed the agreement and entered into a new agreement that stipulates the enhancement of corporate disaster prevention functions so as to further increase the safety of local residents.