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To enhance the identification and control of accident risks in confined space operations in industrial and commercial enterprises, a socially acceptable risk standard for such operation accidents was established, and a risk grading study based on F-N curve was conducted. First, historical data on significant and higher-level accidents in confined space operations from 2014 to 2021 were analyzed statistically in terms of fatalities, accident frequency, and the number of enterprises involved, in order to identify accident patterns. Then, considering accident frequency and fatality consequences, a socially acceptable risk standard was developed based on ALARP criteria, and F-N curve was plotted. Finally, a risk grading management model was established based on three risk zones-intolerable, acceptable, and negligible. The control measures were proposed from both enterprise and individual perspectives. The results show that for accidents with 3 to 10 fatalities, the frequency falls within the magnitude of 10-6-10-4. The F-N curve with a slope of -4.033 is used to divide three distinct risk levels, helping to clarify the boundaries of risk levels and highlight management priorities.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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