Inside Pages9Final.indd - Ministry of Power

B. Spillways:
The Spillway arrangement consists of one Gated Chute
Spillway on right bank, 2 nos ungated Shaft Spillways on
Right Bank, (Shaft T-3 & T-4), 2 nos. gated Shaft Spillways
on Left Bank (Shaft T-1 & T-2) and an Intermediate Level
Outlet (ILO).
The work of Chute Spillway and Stilling Basin has been
completed. A total quantity of 8.67 Lac Cum concrete has
been placed in these structures. ILO and T-3 circuit has
been completed and water is flowing through the circuit.
The work fo T-4 circuit is in advance stage of completion.
In Shaft T-1,concrete lining from EI. 668.50 to 815.0 M and
in Shaft T-2, concrete lining from EL 677.0 M to EL 815.0
M has been completed till date and balance works of Left
Bank Shaft Spillways are under progress.
Concreting of 1st stage plug of Tunnel T-2 has been
completed and works of 2nd stage plug are in progress.
Closure of Tunnel-T-2:
With the closure of Diversion Tunnel T-2 on 29th Oct-05,
reservoir impoundment has started.
View of Tehri Dam from Chute spill way
C. Power House Complex:
MINISTRY OF POWER
i. Civil Works
All the civil works of Power House Complex have been
successfully completed.
The work of Maintenance Gate Shaft No. 4 and its transition
with HRT-4 which had become critical due to very complex
geology has been successfully completed by improvised
construction methodology and massive grouting.
The river joining works of TRT-1 & TRT-2 which were
taken-up after closure of diversion tunnel T-2 are nearing
completion.
ii. Electro-Mechanical Equipment:
The boxing up of Unit-IV, III and II has been completed.
Boxing of Unit-1 is in advance stage of completion.
Erection of all 4 Nos Transformers (306 MVA each), 400
KVA Gas Insulated Switchgear and Gas Insulated Busduct
have also been completed. The various auxiliaries system
including Governor Control Systems in the Power House
have been completed and pre-commissioning of units
is in progress. The Power House Control Room with
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