Occupational Health and Safety

Scope: Employees and temporary employees of the Semiconductor Company, Metrology Company, and Administration Company, Tokyo Seimitsu

The total number of occupational accidents in fiscal 2025 increased by five from the previous fiscal year, with 2 cases involving accidents resulting in leave and 13 others involving accidents not resulting in leave.　 An increasing number of accidents resulted from “falling.” We raised safety awareness by promoting workplace meetings and the practice of calling out to each other. We are also driving other environmental improvement efforts, such as putting warning stickers for stairs and installing anti-slip tape.

Scope: Employees and temporary employees of the Semiconductor Company, Metrology Company, and Administration Company, Tokyo Seimitsu

Tokyo Seimitsu uses accident frequency rate and severity rate as indicators to evaluate the occurrence of occupational accidents.
We monitor annual results and the occurrence of occupational accidents at manufacturing companies (companies with over 100 employees).

*¹ Frequency rate: Indicates the frequency of injury or death due to occupational accidents.
    Formula: (Casualties / total hours worked) × 1,000,000
*² Ministry of Health, Labour and Welfare (Survey on Industrial Accidents)

*¹ Severity rate: Percentage of the degree of loss caused by occupational accidents.
    Formula: (Total lost workdays / total hours worked) × 1,000
*² Ministry of Health, Labour and Welfare (Survey on Industrial Accidents)

Our plants in Hachioji, Hanno, and Tsuchiura each have the Safety and Health Committee, with each plant manager serving as the general safety and health manager. By formulating and deliberating on major health and safety issues and working to maintain and improve a safe and comfortable work environment, the committee aims to enhance employees’ awareness of health and safety in the workplace and to maintain and promote their health. Each committee meets once a month in principle, as well as on an ad hoc basis when the general safety and health manager deems it necessary. In fiscal 2025, the Safety and Health Committee convened as planned.

At the Furudono Plant, which is a small-scale workplace with fewer than 50 employees, the plant manager promotes workplace safety and health as a health promoter and participates in the Safety and Health Committee of the Tsuchiura Plant to report on the Furudono Plant. We conduct internal audits twice a year, with results submitted to the Audit Department of the head office and reported to the Board of Directors. The Safety and Health Committee is also subject to audits by the Audit Department.

In addition, each plant has appointed a Chemical Substances Control Manager and a Personal Protective Equipment Manager.

At the Hachioji Plant and Hanno Plant, health supervisors generally conduct weekly workplace patrols to check equipment, work methods, and hygiene conditions, and take necessary measures. Patrol records for which health supervisor workplace patrol checklists are used are submitted to the General Affairs Section and kept for five years.

At the Tsuchiura Plant, managers and general staff conduct weekly 5S patrols, while the Health and Safety Subcommittee members perform monthly safety patrols. In cases where improvements are needed, follow-up patrols are conducted after the improvements are proposed to confirm the effectiveness of the patrols. Similarly, “5S and safety patrols” are conducted once a month at the Furudono Plant. When areas for improvement are identified at any of these plants, we conduct follow-up patrols to verify the effectiveness of corrective actions.

We regularly conduct risk assessments by conducting workplace inspections to check working environments and identify issues. This leads to the creation of measures for dealing with these issues and brings about improvements. In addition to risk assessments performed when introducing new machinery or changing work procedures, we work to avoid risk by conducting education and training on machinery operation, heavy equipment work, wiring operation, and other topics as needed.

Metrology Company and Semiconductor Company conduct regular risk assessment training with outside instructors every year to prevent occupational accidents. The fiscal 2025 training was held in group work format, with members of different departments analyzing issues with the current risk assessment and discussing ways to improve the effectiveness of risk assessment with regard to a series of processes from hazard identification to risk estimation and mitigation. Bringing in perspectives of other divisions provided a very meaningful opportunity to review one’s own safety management system objectively.

We conduct in-house training and certification testing to help employees avoid hazards in a variety of situations, including commuting, traveling, and working in the plant.

In order to promote activities to prevent industrial accidents among local workers, we participate in seminars held by the Tokyo Federation of Labor Standards Associations, Hachioji Branch. These seminars are designed for participants to acquire the skills necessary to engage in work. Employees who have completed the seminars take in-house practical tests tailored to factory environments for thorough health and safety education.

Locations covered: Tokyo Seimitsu Co., Ltd. Hachioji Plant, Hanno Plant, Tsuchiura Plant, and Furudono Plant

Locations covered: Tokyo Seimitsu Co., Ltd. Hachioji Plant, Hanno Plant, Tsuchiura Plant, and Furudono Plant

The Semiconductor Equipment Association of Japan promotes “SEAJ recommended safety training” an industrial standard for safety training of personnel involved in the installation, maintenance, and servicing of semiconductor manufacturing equipment. At the Hachioji Plant, our employees who belong to the Semiconductor Equipment Association of Japan’s Safety Training Subcommittee conduct “SEAJ recommended safety training” for Semiconductor Company CEs and manufacturing and design engineers who work on the manufacturing floor or in the clean room. A total of 524 employees have participated in the seminar so far.

* Corrected because the calculated total number of participants in fiscal 2025 was incorrect.

Every year, the Disaster Prevention Subcommittee under the Safety and Health Committee plans and conducts emergency evacuation drills for all plant employees, including those working at subsidiaries and affiliated companies within our plants.

At the Hachioji, Hanno, and Tsuchiura plants, we organize self-defense fire brigades and conduct regular training one or two times a month according to annual plans. The Company also participates in an annual “self-defense firefighting training review” hosted by the Hachioji Fire Department and the Hachioji Fire Prevention Management Study Group. In this competition, self-defense fire brigades from business establishments in the city gather to compete in a heated competition to test the effectiveness of their daily training based on speed and accuracy of indoor fire hydrant operation. In the review of fiscal 2025, 40 teams from 31 business offices in Hachioji City participated. Our self-defense fire brigade from the Hachioji Plant competed in the “No.1 Fire Hydrant” category (in which 21 teams took part).

Semiconductor Company and Metrology Company conduct emergency scenario training at each plant at least once a year for potential hazardous substance leak accidents to ensure that plant personnel can appropriately perform necessary tasks such as recovery and cleaning. Each relevant division submits a training plan to the person responsible for environmental management at the beginning of the term and submits a report promptly after the training is conducted.

・Training for Leakage of Chemical Substances with High Alkaline Content

・Chemical cleaning agent splash scenario drill

When considering the purchase of industrial chemicals, we conduct a chemical substance risk assessment to check for the presence of contained environmental pollutants (organic solvents, specified chemical substances, hazardous materials, etc.), in accordance with our internal regulations. The department in charge of this matter at the Hachioji Plant decides whether to purchase the chemicals based on the results of assessments conducted at the Hachioji, Hanno, and Tsuchiura plants.

In fiscal 2025, 166 chemical substance risk assessments were conducted for newly adopted chemicals and to review chemicals already in use.

We require divisions that manage and use chemical substances to conduct regular inspections and regular quantity checks. The Company is also promoting the reduction and substitution of chemical substances in accordance with the PRTR Act, Ordinance on Prevention of Organic Solvent Poisoning, and the Poisonous and Deleterious Substances Control Act.