An underground repository for the final disposal of low and intermediate level radioactive waste is being constructed at Olkiluoto in South-Western Finland. The repository with total volume of 90 000 m3 has been excavated at the depth of 60–100 m in granitic bedrock: The radioactive waste will be emplaced in two cylindric rock silos, which have a diameter of 24 m and are 32 m high. This paper describes the preinvestigations and the use of the results in the design analysis of the repository. The investigations including the systematic fracture mapping and rock monitoring measurements during the construction works are also presented.
Un depôt souterrain pour la decharge finale des dechets de faible et d"intermediaire radioactivite est en construction à Olkiluoto, dans le sud-ouest de la Finlande. Le depôt, dont le volume total est de 90 000 m3, à ete czeuse a la profondeur de 60–100 m dans une assise rocheuse granitique. Les dechets radioactifs seront places dans deux silos cylindriques qui ont un diamètre de 24 m et une hauteur de 32 m. Cet expose decrit les preinvestigations et l"emploi des resultats dans l"analyse de conception du depôt. Les investigations comprenant le relèvement topographique systematique des fractures et les mesures de contrOle de, la"roche durant les,travaux de construction sont egalement presentes.
Der Bau einer unterirdischen Deponie zur Endlagerung von schwach und mittelst,ark radioaktiv verseuchtem Abfall wurde bei Olkiluoto im Suedwesten Finnlands in Angriff genommen. Die 90 000 m3 umfassende Deponie wurde in Teufen zwischen 60 und 100 m aus dem Granit des Grundgebirges ausgebrochen. Der radioaktive Abfall soll in zwei zylinderförmig ausgebrochenen Felssilos mit einem Durchmesser von 24 m und einer Höhe 32 m gelagert werden. Vorliegendes Dokument beschreibt die Vorermittlungen sowie die Anwendung der Resultate in der Planungsanalyse der Deponie. Die Ermittlungen inklusive der systematischen Klueftungskartierung und Gebirgsueberwachungsmessungen wahrend der bergmannischen Arbeiten werden ebenfalls beschrieben.
Based on the Nuclear Energy Law, the waste producers in Finland are responsible of the waste management the final disposal included. Crystalline bedrock offers a stable surroundings to the final disposal of radioactive wastes. Therefore, Teollisuuden Voima Oy (TVO) is constructing an underground repository, the VLJ repository, for its low- and medium-level operating wastes. The VLJ repository is being constructed at Olki1uoto, at the power plant site (Figure 1).
Operating wastes are low- and medium- level wastes generated at a nuclear power plant during its operation. The high-level wastes contained in spent nuclear fuel are not included in operating wastes.
The wastes will be transported to the repository through a transport tunnel seen in Figure 2. The personnel and the visitors can enter the repository via a vertical shaft which also serves as a channel for the cables and the pipes. The waste packages will be emplaced in the silos. The emplacement will be controlled remotely from an aboveground control building.
The low-level waste will be positioned in the silo for the low-level waste inside large concrete boxes (Figure 3).
