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首页> 外文会议>International conference on environmental remediation and radioactive waste management >DECOMMISSIONING OF THE ACTIVE STORAGE FACILITY FOR RESIDUALS IN RHEINSBERG (BRANDENBURG/GERMANY) AND RESULTS OF GROUNDWATER MONITORING
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DECOMMISSIONING OF THE ACTIVE STORAGE FACILITY FOR RESIDUALS IN RHEINSBERG (BRANDENBURG/GERMANY) AND RESULTS OF GROUNDWATER MONITORING

机译：莱茵斯堡（德国勃兰登堡/德国）居民主动存储设施的退役和地下水监测结果

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The Active Storage Facility for Residuals (Aktives Lager fur Ruckstande - ALfR) - an open-air controlled area - was used for the storage of radioactive waste (liquid and solid waste) at the site of the NPP Rheinsberg in the former GDR. Liquid waste was cemented and dumped for near surface final disposal. During the period of operation of the ALfR some incidents happened. Residues of evaporated cooling water of unknown amount (ca. 1-10 m~3), the drop-out from small leakages and the wash-off from contaminated open-air storage barrels contaminated the soil. Since 1997 the buildings of the ALfR have been decommissioned and the site will be remediated. From the beginning of decommissioning up to now the groundwater has been monitored. This paper shows different steps of decommissioning and explains the results of groundwater monitoring. Currently 33 sampling points are being used for sampling groundwater from different layers. The radiological parameters under examination are Cobalt-60, Cesium-137, Strontium-90 and Tritium. Non-radiological parameters like Bore, Potassium, Sodium, Nitrate, pH value and TOC (total organic carbon) are also being investigated. Since 1997 the activity concentration of Cobalt-60 and Tritium in the groundwater has been decreasing. The activity concentration of Strontium-90 had increased from 1997 to 2007. Since 2007 activity concentration of Strontium-90 has been decreasing. 350 m away from the ALfR, in the direction of groundwater flow, the Lake Stechlin is located in a nature protection area. The groundwater beyond the ALfR-site is not used as drinking-water and up to now there has been no detectable contamination of Lake Stechlin. Therefore there is no radiological impact on humans by contaminated groundwater. The hypothetic effective dose of Cobalt-60, Tritium and Strontium-90 resulting from postulated consumption of groundwater was determined using consumption rates according to the German Radiation Protection Ordinance. In case of using the groundwater as drinking-water the annual effective dose is 0,4 mSv/a at a postulated drinking-water well on the ALfR-site and 2,5 μSv/a at a postulated drinking water well in a distance of 142 m. Results of the observations: The observations of direction and velocity of the flow of the ground-water principally confirms the transportation model made at the beginning of decommissioning of ALfR. In vertical direction, the real spread of contamination in the groundwater is smaller than assumed. The dilution of Co-60 is higher than assumed. In contrast to the assumptions of the transportation model, Cesium-137 has a lower mobility.
机译：残留物主动存储设施（Aktives Lager fur Ruckstande-ALfR）是一个露天控制区，用于在前东德Rheinsberg站点的NPP Rheinsberg站点存储放射性废物（液体和固体废物）。将废液胶合并倾倒以进行近地表最终处置。在ALfR运行期间，发生了一些事件。蒸发的冷却水残留量未知（约1-10 m〜3），小泄漏造成的滴落以及受污染的露天储水桶的冲刷污染了土壤。自1997年以来，ALfR的建筑物已退役，该场地将得到修复。从退役开始到现在，一直对地下水进行监控。本文介绍了退役的不同步骤，并说明了地下水监测的结果。目前，有33个采样点被用于对不同层的地下水进行采样。接受检查的放射学参数为钴60，铯137，锶90和Tri。还正在研究非放射线参数，例如孔，钾，钠，硝酸盐，pH值和TOC（总有机碳）。自1997年以来，地下水中钴60和Tri的活度浓度一直在下降。从1997年到2007年，锶90的活性浓度有所增加。自2007年以来，锶90的活性浓度一直在下降。 Stechlin湖位于地面自然保护区，距离ALfR 350 m，沿地下水流方向。 ALfR站点以外的地下水未被用作饮用水，到目前为止，尚没有可检测到的Stechlin湖污染。因此，被污染的地下水不会对人类造成放射学影响。由假定的地下水消耗量得出的假设的钴60 、,和锶90的有效剂量是根据德国辐射防护条例使用消耗率确定的。如果使用地下水作为饮用水，则在ALfR站点的假定饮用水井处的年有效剂量为0.4 mSv / a，而在假定饮用水井中，距离为2的年有效剂量为2.5μSv/ a。 142米观测结果：对地下水流动方向和速度的观测主要证实了在ALfR退役开始时建立的运输模型。在垂直方向上，地下水中污染物的实际扩散比假定的要小。 Co-60的稀释度高于假定值。与运输模型的假设相反，铯137具有较低的迁移率。

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