Drilling activity in the radioactive waste disposal site explorations
The ROTAQUA Ltd. as subcontractor of Bátatom Ltd., MECSEKÉRC Rt. implemented the drilling works in the projects (Bátaapáti, BAF) exploring the possible disposal of the Hungarian nuclear wastes (both low- and high activity wastes ).

Low- and intermediate level wastes (L/ILW)

Since 1996 we have implemented diamond drillholes in Bátaapáti (Üveghuta) as contractor of the Hungarian Geological Institute in the project investigating the possibilities of final disposal of low- and intermediate level radioactive wastes originated from the operation of the Paks Nuclear Power Plant
During the implementation of drilling works we have applied both the air-flushing core drilling . in young, loose overburden sediments . and the reversed flushing wire-line technology in granite. We have used the safe pilot drilling technology in cavings and tectonized formation: processing of caving, strata stabilizing grouting, drilling of stabilized caving and cement plug with core, and finally the continuation of core drilling.
We have taken part in the hydro-dynamical tests of the borehole performed by packers according to the demands of Golder Associates Hungary.
The works were continued with drilling of the boreholes Üveghuta-2 . 38. The overburden sediments were drilled by air flushing technology. In the granite the drilling was performed applying flushing, diamond bits, double or triple tube core barrels, and wire-line technology.
In the borehole Üveghuta- 39 we have already used routinish the GEOBOHR-S triple tube transparent plastic core barrel at the penetration of the sediment overburden.
We can ensure the high core recovery and excellent core condition in all rock formations (.traditional. granite, silicified, cracked etc.)
Recently (2006) we work on the implementation of the two axis boreholes (1750 m) of the double inclined shafts. We have taken part in the construction of the temporary adit entrance. In the frame of this we have completed the works of drilling, grouting, build in of the soil bolting and the Canopy tubes.

Diósberény and Udvari
In the area we have implemented complete drilling exploration in soft and loose sediments for similar purpose.
On both sites we have drilled core drilling with flushing (using double, and triple tube core barrels), in Udvari with air flushing with inner core barrel equipped spiral drill bit to ensure undisturbed cores. The core recovery with flushing was 95 % .
Based on the data gained from the core drilled boreholes completed in the first phase of the program, we have settled borehole pairs for hydro-dynamical investigation of granite and its young, loose sediment overburden. After the borehole cleaning . according to the requirements of the client . we have performed the first hydro-geological test too of the borehole pairs (with pumping).

Our company takes part as subcontractor of the MECSEKÉRC Rt. in the additional exploration of the Radioactive Waste Surface Disposal Facility in Püspökszilágy.
In the project we implement geological exploration boreholes (20-60 m depth), and geological mapping boreholes (20-50 m depth) using GEOBOHR-S triple tube core barrels.

High level waste disposal site


In Hungary, the exploration program aiming at the final disposal of high level radioactive wastes started with the investigation of the Boda Claystone Formation (BAF) at the end of 1993. The objective of the program is the siting of the area(s) and underground research laboratory investigating of the disposal possibility of high level and long living radioactive wastes and spent fuel elements in geological repository in the Permian Claystone formation in the Western-Mecsek. Our company have implemented the drilling activities during the investigation program.
The surface boreholes are drilled by air or clean water flushing and core drilling technology.
In the project investigating the Boda Claystone Formation which continued since 2003 we have completed the following boreholes: Het-6, Bak-5 for rock physical test , Het-4, Bak-5/1, 5T, Eg-1, 2, Cserdi-16 for water monitoring. The Ibafa-4 geological structure exploration borehole is under construction which was planned to reach the 1500 m depth.