Main Access Tunnel

This experimental site is set up in a tunnel system (see Figure 1) that branches off from a main access tunnel towards the KWO (Kraftwerke Oberhasli AG) underground power station. The GTS tunnel system comprises a laboratory tunnel with a total length of almost 1,000 m plus a central building that houses all the operating facilities (Ortuno, 2000). 

Ventilation of the factory was achieved by a comprehensive system of extraction trunking which filled the upper section of the four access tunnels, with branches into the workshop areas. At each main entrance the trunking terminated at prominent brick towers which housed the ventilation equipment. 

Electron spectroscopic studies by Coughlan show that in 27% Ni " L the nickel is located in the main tunnels of the hydrated zeolite, but on dehydration Ni + migrates to less accessible sites as indicated by increasing inaccessibility to both water and ammonia. In contrast to this, migration of Ni " into hexagonal prisms in Y zeolite could be reversed by admitting ammonia to the system. ... 

Fortunately, the success of surface science, optical and x-ray techniques in the last few decades has provided access for electrochemists to structural information of electrode/electrolyte interfaces. The optical and X-ray spectroscopic techniques have mainly been used in situ, i.e., in the presence of the bulk electrolyte. These techniques include EXAFS (extended x-ray absorption fine structure), SXS (surface x-ray scattering), XSff (x-ray standing wave technique, SERS (surface enhanced Raman scattering), NOM (nonlinear optical methods) IRS (infrared spectroscopy), MS (Mossbauer spectroscopy), RLS (radioactive labelling spectroscopy), STM (scanning tunneling microscopy), and... 

From the Lower Site two inclined adits descend north-easterly to intersect the main Tunnel line landward of the coast, and in this intersection area enlargements of the three tunnels are constructed to form an underground operations area known as the Marshalling Tunnels. A vertical Access and Ventilation Shaft at die NE side of the Marshalling Tunnels provides a direct connection to the Upper Site. 

In order to ensure an easy accessibility to the bearings between the LP compressor and the HP compressor without requiring the removal of the main housings the two housings were interconnected by a pressure-tight tunnel. 

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