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  Risk Analysis in Tunnel Linkage of two cascade Hydro Electric Projects- 1500MW NJHPS (Nathpa Jhakri Hydro Power Station) with under - construction 412MW RHEP (Rampur Hydro Electric Project by Removal of 15m long Rock Plug of concreted 15.177km long, 10.5m

  The 1500 MW (6X250 MW), Nathpa Jhakri Hydro Power Station a run-off the river scheme presently largest in the country, is the first project commissioned by SJVN Limited . The main features of the project are a 62.5m high concrete dam , four desilting chambers each 525m long, 16.3m wide and 27.5m high, the head race tunnel (HRT) is 27.4km long and of 10.15 m diameter, surge shaft at the end of HRT is 21.6m in diameter and 301m deep. Three butterfly valves are provided on the pressure shafts, 4.9m dia with lengths varying from 571m to 622 m housed in an underground valve chamber, 79.52 m x 9.50 m x 22.34 m. The machine hall cavern is 222 m x 20 m x 49 m high and transformer hall cavern is 196 m x17.5 m x 27.4m high.

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