1. There was a reference including procedures that was taken when contractors carried out the same work three years ago. But, it was not completed.
2. Passed the heavy guide roll for a rubber belt to the unstable pallet which was lifted up by the forklift.
3. Had not implemented countermeasures which prevent rolling when putting the roll on the pallet.
4. In regard to handling heavy loads, all relevant employees on this work were lack of risk prediction."