(Progress on Disclosure Matter) Inappropriate Practices at Our Mukoshima Plant
Kanadevia Corporation
Our Mukoshima Plant; bridges, marine structures and chimneys
The inappropriate practices at the Mukoshima Plant resulted from the complex interaction of multiple issues, including the environment, organizational culture, management systems, employee awareness and the transfer of technical expertise. The reason for the replacement was deficiencies in some of the supporting materials.
Related procedures
Submission of an interim report to the Ministry of Land, Infrastructure, Transport and Tourism
Ministry of Land, Infrastructure, Transport and Tourism
Company response
A special investigation committee was established on 17 July 2024. A technical verification team comprising the task force and engineers was established. As outside experts, Asai Satoru (浅井知), Ohata Mitsuru (大畑充) and Kiyomiya Osamu (清宮理) were appointed.
Messages from management and briefing sessions on the investigation findings; strengthening the independence of the quality assurance organization and establishing a Quality Compliance Committee; rebuilding quality training; ensuring the implementation and auditing of recurrence-prevention measures at the Mukoshima Plant; reacquiring ISO 9001 certification and transitioning the audit system; thorough verification and recordkeeping of qualifications; pre-welding work meetings; strengthening supervision of welding operations; post-welding completion checks; preventing falsification of UT results reports and strengthening the storage and management of raw data; cross-checking inspection company reports against reports submitted to customers; strict compliance with regulations governing the timing of UT inspections; preventing falsification of MT results reports and strengthening the storage and management of raw data; requiring consultation with and formal approval from the owner and prime contractor; cross-checking material certificates for the steel used against construction plans; completing, recording and confirming coating-thickness measurements at each painting stage; making coating specifications and measurement timing visible; introducing a system to prevent falsification of coating-thickness measurement results; establishing rules for touch-up painting and remeasurement; prohibiting shipment without inspection or falsification of measurement values for production-schedule reasons; introducing a double-check system for final coating-thickness measurements
There is no change to the disclosed content.
For bridges and other structures currently in service, on-site checks of the structures concerned and monitoring of developments will be conducted in coordination with road administrators and in conjunction with periodic inspections and other activities. Further recurrence-prevention measures will be taken based on the existing measures. For certain projects, discussions with customers will be held, including on-site inspections.
| Item | Details |
|---|---|
| Event name | (Progress on Disclosure Matter) Inappropriate Practices at Our Mukoshima Plant |
| Date of occurrence | 18 August 2026 (date of replacement disclosure). The dates on which the original events occurred differ for each inappropriate practice. |
| Date recognized / date notice received | 18 August 2026 (date of disclosure concerning deficiencies in the materials subject to replacement) |
| Subject Entity | Kanadevia Corporation |
| Target Locations / Products | Our Mukoshima Plant; bridges, marine structures and chimneys |
| Cause | The inappropriate practices at the Mukoshima Plant resulted from the complex interaction of multiple issues, including the environment, organizational culture, management systems, employee awareness and the transfer of technical expertise. The reason for the replacement was deficiencies in some of the supporting materials. |
| Impact on Earnings Forecast | There is no change to the disclosed content. |
| Type of litigation or proceeding | Submission of an interim report to the Ministry of Land, Infrastructure, Transport and Tourism |
| Court or authority | Ministry of Land, Infrastructure, Transport and Tourism |
| Date of filing / date of action | 6 November 2025 (date the interim report was submitted) |
| Investigation structure | A special investigation committee was established on 17 July 2024. A technical verification team comprising the task force and engineers was established. As outside experts, Asai Satoru (浅井知), Ohata Mitsuru (大畑充) and Kiyomiya Osamu (清宮理) were appointed. |
| Measures to prevent recurrence | Messages from management and briefing sessions on the investigation findings; strengthening the independence of the quality assurance organization and establishing a Quality Compliance Committee; rebuilding quality training; ensuring the implementation and auditing of recurrence-prevention measures at the Mukoshima Plant; reacquiring ISO 9001 certification and transitioning the audit system; thorough verification and recordkeeping of qualifications; pre-welding work meetings; strengthening supervision of welding operations; post-welding completion checks; preventing falsification of UT results reports and strengthening the storage and management of raw data; cross-checking inspection company reports against reports submitted to customers; strict compliance with regulations governing the timing of UT inspections; preventing falsification of MT results reports and strengthening the storage and management of raw data; requiring consultation with and formal approval from the owner and prime contractor; cross-checking material certificates for the steel used against construction plans; completing, recording and confirming coating-thickness measurements at each painting stage; making coating specifications and measurement timing visible; introducing a system to prevent falsification of coating-thickness measurement results; establishing rules for touch-up painting and remeasurement; prohibiting shipment without inspection or falsification of measurement values for production-schedule reasons; introducing a double-check system for final coating-thickness measurements |
| Outlook | For bridges and other structures currently in service, on-site checks of the structures concerned and monitoring of developments will be conducted in coordination with road administrators and in conjunction with periodic inspections and other activities. Further recurrence-prevention measures will be taken based on the existing measures. For certain projects, discussions with customers will be held, including on-site inspections. |
Items this document does not state (12)
These are items the company does not state in this document. We do not leave them blank, nor fill them in from other sources or by inference.
The reasons the company gives
The company's own explanation, not something inferred from the numbers.Because some of the supporting materials attached to the documents published on 6 November 2025 were deficient.