배기덕트 청소 작업자의 작업환경 실태 평가 사례

Objectives: Work environment for workers cleaning contaminants in exhaust duct was analyzed and workers exposed level of hazardous factors were estimated. Methods: A total of four factors: "gas, noise, dust and personal protection equipment" were analyzed to evaluate the risk of the working envirnoment. This study was applied to the site where cleaning duct in semiconductor manufaturing plant. The working environment was measured for two workers cleaning contaminants in exhaust duct. Results: As a result of investigating chemical factors, gaseous matters including ammonia and benzene were detected, but they were measured less than the TWA limit. In noise case, it was founded that the noise was operated below the upper limit. Dust was also found to be insufficient than the TWA limit, the same as gaseous substances. Finally, as a ruslt of investigating the status of PPE use, it was operated more strictly than PPE selection criteria based on KOSHA guideline. Conclusions: In order to create a safe workplace for workers, work environment was regularly measured, and as a result of measuring exposed levels of gaseous matters, niose, they were stably maintained below the upper limit.