OREANDA-NEWS. September 11, 2009. Over recent day, pump fire-extinguishing system has been started up within the body of the dam at the 494.0 level and 95 cubic metres of metal and ferro-concrete structures have been removed, bringing the total so far up to 7825 cubic metres.  A structured cable system has been installed in the control board and administrative blocks (hydro-engineering structure laboratory premises) at the 500-outdoor switchgear and work has been launched on restoring the cable network and telephone links to the turbine room.

Currently, 2187 people are involved in the accident and restoration work at the Sayano-Shushenskaya HPP, plus 38 pieces of equipment.

The systems for the station as a whole are being restored in accordance with the set timetable: pump stations (artesian, drainage and sewage) have been started up, as has the hot water supply; the smoke-removal system is also now in operation in the installation site block.  Preparations are under way to create additional entry routes to the construction zone of the turbine room from the right bank and installation has been launched of a motor road flyover at the end of the turbine room block.

During preparations for the winter season, creation of the thermal contour of the turbine room is also under way and it is planned to complete it by 11 November, 2009.  Restoration of the heating system for the administrative technological building is in progress and steps are being taken to dismantle the 500 kV overhead crossing cables of blocks T4 and T5.

The flow sections of hydro-generator 2 and hydro-generator 6 have now been dried out.  Work on identification of defects and restoration is being carried out on hydro-generators 6, 5, 4, 3 and 8.  Installation of the metal structures of the support column in the turbine room near hydro-generator 2 has been completed, concrete is being laid and the roof at level 327.00 of hydro-generator 9 is now being dismantled. Work is continuing to restore the electric power supply grid for the HPP’s own needs: two 35/6 kV substations with a capacity of 10 MVA and 3,125 MVA have been installed and connected, as have 6 kV busbars Sh1, Sh2 and Sh3 and 0.4 kV boards N1, N4, N9 and N17.

The inflow of water to the dam of the Sayano-Shushenskaya HPP is 2350 cubic metres per second, and the water is released through the spillway at a rate of 3055 cubic metres per second.  The level of the headrace and the release of water through the hydro-engineering structures of the power station comply with the water release regime recommended by the Water Administration of the Angaro-Yenisei Basin, adjusted for the operating mode.  The level of the headrace is 536.92 metres (the normal level being 539 metres).  The level of the tailrace is 324.73 metres.

At the Mainskaya HPP, hydro-units 1, 2 and 3, with an aggregate capacity of 193 MW, are in operation, the headrace level being 323.52 metres and with 4 of the spillway gates opened.

Constant control is being exercised over the state of the water in the Yenisei River.