2020 Volume 27 Issue 1 Pages 22-33
Geological disposal of radioactive wastes requires the large amounts of fundamental technical knowledge throughout the project such as the investigation of geological environment, facility construction, operation and closure. Monitoring is carried out to collect site-relevant information for the creation of an environmental database, to assist in the decision-making process, to provide information for the various stakeholders, etc. We summarized the current technical level and problems of the groundwater monitoring in the world. Through the research and technology development so far, the technologies have been developed for drilling borehole in the geological environment survey prior to monitoring and the selection of the monitoring site. On the other hand, the following technical developments are remaining issues: long-term operation method of monitoring equipment, retrieving method of monitoring equipment after long-term operation, transport method of backfill material for borehole sealing, technical basis for the sealing performance when the borehole-protective casing and strainer tube are left. Thus, to plan for the groundwater monitoring, preliminary studies on long-term operation of monitoring equipment and abandonment of monitoring borehole are necessary.
