// Disposal Technology and Specialpurpose Machines, Special solutions for the mining and construction industry

SULa

Safety studies on the shaft transport of heavy loads with a payload of up to 175 tons

The comparative analysis of probabilistic safety assessments from 1994 to 2013 reveals that the approach used in 1994 still forms the basis of modern PSA today. Over the years, the methods applied have been refined, and additional events needed to be considered. Conducting a level 2 PSA, as applied in nuclear power plants, allows for the determination of, for example, the amount of radioactive material released due to an undesirable event and the assessment of its consequences using event trees, if necessary. The majority of methods used in PSA for nuclear power plants can be transferred, taking into account the differences between the operating modes and processes of nuclear power plants and shaft hoisting systems. A deterministic approach to accident analysis with the aim of evaluating operational safety during the design of a shaft hoisting system is appropriate. Regarding international developments in safety analyses for shaft transport technology, it should be noted that a universally accepted approach to operational safety assessment is still lacking. Examination of possible measures to minimize residual risk yielded various approaches, such as shortened maintenance intervals to increase the reliability of shaft hoisting systems and the use of, for example, shock absorption systems to control the effects of a container falling into the shaft. The additional examination of the disposal of TLB in different host rocks at a boundary design temperature of 100°C highlighted the need to examine the permissible temperature on the outer shell of the TLB for each host rock, including clay, granite, and salt.