Mitsui Chemicals

Safety and Prevention

Based on our management policy of putting safety is our top priority in everything that we do, we have continued to implement a range of safety activities throughout the Mitsui Chemicals Group. Nevertheless, the explosion and fire occurred at the resorcinol production facility inside our Iwakuni-Ohtake Works in 2012. Reflecting on that incident, we have been implementing a series of measures to prevent major accidents and fundamental safety initiatives to ensure that nothing like that ever happens again.

In fiscal 2017, a fire broke out at the Company’s Ichihara Works Mobara Branch Factory. We recognize that there are also many points that apply to the incidence at our Iwakuni-Ohtake Works on which we must reflect. In addition, a fire broke out at our Osaka Works in June 2018. We take this latest incident very seriously and will strive to prevent any future recurrence.

Reaffirming their heartfelt commitment to the pledge that “safety is essential and for the benefit, not only of ourselves, but also our families, colleagues, and society as a whole,” while thinking carefully about what they can do to ensure safety, all employees will act appropriately to raise safety levels.

Please refer here for details of fires that broke out at the Mobara Branch Factory and Osaka Works in July 2017 and June 2018, respectively.

Management System


In the Responsible Care Policy, we pledge that “safety is our top priority and focus on achieving zero accidents and occupational injuries.” In addition, we are working to ensure safety and prevention in accordance with the Company rules on environmental safety management, which set out basic matters concerning safety and prevention (occupational safety as well as process safety and disaster prevention).

System and Responsible Officers

Assigning the president as the Chief and the director in charge of the Production & Technology Center as the person directly responsible, the Safety & Environment Technology Division formulates, disseminates and promotes the safety and prevention strategy. For example, through regularly holding all base meetings, they also collaborate with business divisions, production sites and affiliated companies to ensure safety and prevention.
The Company holds Health and Safety Committee meetings that include the participation of the responsible officers and labor union members for each site. At these meetings, the attendees report on and deliberate issues relating to occupational safety and health, including occupational accidents.

Monitoring Methods

The Safety and Environment Technology Division regularly checks the achievement of the priority issue targets relating to safety and prevention at domestic bases and ascertains the progress made. In addition, the Division collects, consolidates, and analyzes information on the occurrence of any serious accident and information on occupational accidents in the entire Group and shares that information throughout the Group. Every year, safety and prevention audits are carried out at the Company’s business sites and at the manufacturing sites of companies eligible for Responsible Care support.

Goals and Results

KPI Scope of Compilation FY2017 FY2018 Medium to Long-term
Goals Results Level
Goals Goals
Number of major accidents*1 Mitsui Chemicals Group 0 0 0 0 ongoing
Number of abnormal conditions/accidents*2 Mitsui Chemicals Group Less than 5 6 × 5
Frequency rate of work-related significant occupational injuries*3 Mitsui Chemicals Group Less than 0.15 0.24 × Less than 0.15 Less than 0.15
Major accidents:
Accident with a severity level of 18 points or more, as specified by the Japan Petrochemical Industry Association (JPCA) under Center for Chemical Process Safety (CCPS) evaluation procedures.
Abnormal conditions/accidents:
Although under JPCA accident criteria having an intensity level of less than 18 points, conditions/accidents that the Company judges should be monitored under Company standards in consideration of the relevant laws and regulations.
Work-related significant occupational injuries (WSOI):
Occupational accidents and injuries that are directly related to operations and result in days away from work cases or fatality or restricted work, or transfer to other job and medical treatment cases that are caused by a major incident and have the potential to result in fatality or days away from work cases.

Review and Challenges

Although we have achieved our target of zero major accidents for the past few years, six abnormal conditions/accidents occurred in fiscal 2017. With regard to the fire (abnormal condition/accident) that broke out at the Ichihara Works Mobara Branch Factory on July 27, 2017, the Company completed countermeasures planning following analysis of the direct causes and in-depth cause analysis in fiscal 2017.
In comparison with the Japanese all-industry and Japanese chemical WSOI frequency rates, the WSOI frequency rate for the Mitsui Chemicals Group remains high, and the Company has yet to achieve the highest global standard of 0.15 or below.
Based on the above, the Company believes that its long-term tasks include the nurturing of human resources with a high awareness of dangerous situations and the ingraining of a safety culture throughout the Group.