Human Intrusion Scenario Solution Mined Cavern

The human activities which can lead to radioactive release from the salt dome are mining, borehole drilling and leakage of an abandoned storage cavern, which was made by solution mining. All these activities can accidentally take place in a former HLW repository area. The paper intends to evaluate the consequences of the later scenario. The following assumptions are made: A storage cavern is created by solution mining technique. The waste canisters of an old HLW borehole which are laid open during mining of a cavern, are buried in the field of insolubles. After the storage cavern falls into disuse, it becomes filled with water. The waste form is dissolved and contaminated brine is expelled through the entrance shaft. A maximum dose of about 4*10-7 Sv/a due to NP-237 has been calculated beginning at about 106 years. Although the probability of this scenario is difficult to estimate its consequences appear still acceptable. (author)