presentation 2011 sept phep3 modified

8/4/2019 Presentation 2011 Sept PHEP3 Modified

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PARBATI H.E. PROJECTS

NHPC Limited( A Govt. of India Enterprise)

Dam of Parbati-III

3rd Regional Customer Meet forEsteemed Beneficiaries

Welcomes

Delegates ofDam of Parbati-II


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Projects under construction by NHPCin Kullu valley

PARBATI H. E. PROJECT STAGE-II ( 800 MW )

PARBATI H. E. PROJECT STAGE-III ( 520 MW )


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PARBATI H. E. PROJECT STAGE-III ( 520 MW )

VIEW OF DAM AREA


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SCHEMATIC DIAGRAM OF PROJECT

Lot-1 (M/s Patel-L&T Consortium) Lot-2 (M/s Jagger-Gammon JV)

De-silting ChambersIntake Tunnels

HRT

SFT

Intake

Diversion Tunnels

TRT

TRT Outlet

PowerHouse

D/s SurgeChamber

GIS cumTransformer

Spillway


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SALIENT FEATURES

DIVERSION TUNNEL - 2 Nos. 6.75 m Dia

- 391 m & 440 m Length

DAM - Rock fill 43m High 218 m LongSPILLWAY - Orifice Type 2Nos. 7.2m Wide

with 2 Radial Gates of 7.2m X14m

DESILTING CHAMBERS - 2 Nos. 12.2m X 22.5m X 250m

HEAD RACE TUNNEL- 7.25m Dia. 7869m Long

SURGE SHAFT - Restricted Orifice Type 13m

Dia 147m High

VERTICAL PRESSURE SHAFT - 2 Nos. Steel Lined 4.5m Dia 310m

POWERHOUSE - Underground Machine Hall of Size 123mX22mX43.6m

TAILRACE TUNNEL - 8.1m Size, 2713m Long

COMPLETION SCHEDULE - July.2012


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SALIENT FEATURES

ANNUAL ENERGY GENERATION 1963 MU

Unit Tariff(Current CERC notification and prevailinginterest rate)

Rs. 2.97

CCEA CLEARED PROJECT COST

(AT MAY 2005 PRICE LEVEL) 2304.55 Cr.

CUMMULATIVE EXPENDITURE

(Up to Aug 2011- Provisional)

1539.02


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M.O.U (Govt. of HP & NHPC) : 20 Nov.1998

Techno-Economic Clearance by CEA : 12 Nov. 2003

Environment Clearance by MOEF, : 16 Apr. 2005

Forest Clearances by MOEF : 13 Jun 2005

CCEA Clearance (Govt. of India) : 09 Nov.2005

Environment Clearance by SCST&E,

Shimla (Govt. of H.P) : 26 Dec.2005

Consent by HP SPCB : 20 Jan. 2006

CHRONOLOGY OF CLEARANCE


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MAJOR HIGHLIGHTS

1. DT cum Spillway Tunnels including Lining

2. DT Intake Structure including HM gates

3. Cut-off wall

4. Overt lining of both Branch tunnels

5. Excavation of HRT From Face-1,2,3 & 4

6. Concreting of Power Intake structure7. Intake Structure area concrete

8. Spillway Control Structure Concrete

WORKS COMPLETED (DAM)

WORKS COMPLETED (POWER HOUSE)

1. All Major Excavation Works.2. Barrel Concrete of Unit-1 & 2.

3. Control Block Concrete

4. TRT U/s Overt Concrete


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MAJOR HIGHLIGHTS

1. Plunge Pool Excavation

2. HRT Concrete Lining

WORKS UNDER PROGRESS (DAM)

WORKS UNDER PROGRESS (POWER HOUSE)

1. HRT Concrete Lining

2. Surge Shaft Concrete Lining3. Pressure Shafts Concrete Lining

4. Transformer Cavern Concreting

5. Power House Unit-3 & 4 Concreting

6. Surge Chamber & Draft Tube Concreting

7. TRT D/s Concrete Lining

WORKS UNDER PROGRESS (E&M)

1. Assembling of Unit-1


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Damages due to recent Cloud Burst near Adit-2


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Damages due to recent unexpected rainfall


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PARBATI H.E. PROJECT, STAGE - II

(4x200MW)


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LAYOUT PLAN PARBATI H.E. PROJECTSTAGE-II (800 MW)

Intake structure

Diversion

Tun

nel

Pa

rbatiRiver

Head Race Tunnel

Adit 1

Pancha Nallah Trench Weir

Feeder Tunnel

Power House

Adit 2 Adit 3

Adit 4Adit 5

Jiwa NallahSainj River


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PARBATI H.E. PROJECT, STAGE-II (800MW)

The Parbati Hydroelectric project Stage-II is a run off the river and inter-basin transfer scheme and is spread over four valleys namely Manikaran

valley, Garsa Valley, Sainj Valley and Jiwa Valley in Kullu district ofHimachal Pradesh.

Date of Signing of MOU/PIA: Project taken over from

HPSEB on 20.11.1998

DPR of Parbati Stage-II cleared Oct-2000

TEC accorded Jan-2001

Environmental Clearance June-2001

RR Plan Approved Feb-2002

Date of Signing of ImplementationAgreement (IA) Sept-2002 (as perCCEA)

Schedule Commissioning as per IA Sept-2009 (as per CCEA)

Date of start of construction date Sept-2002

Proposed Commissioning Date Aug-2014

Chronology of Events


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SALIENT FEATURES

DAM83.7m high Concrete Gravity across river

Parbati

SPILLWAY 3 Nos. Orifice type, 6m x 9m Radial Gates

DIVERSION TUNNEL 7.5 Dia., 275m long

DESILTING CHAMBERS 3 Nos., 15m X 16m X 170m

HEAD RACE TUNNEL6m Dia., 31.5 km long (22.5 km by DBM &

9.05 km by TBM)

SURGE SHAFT 17m Dia., 130m depth

PRESSURE SHAFT2 Nos., 3.5m Dia Steel lined 2150m &

2133m length (1546m Inclined)

POWERHOUSE Surface, Size 123m x 47m x 44m

UNITS 4 Nos. of 200 MW each, Pelton Turbine

RATED HEAD 789m (Gross Head 867m)

ANNUAL ENERGY GENR. 3108 MU

ESTIMATED COST Rs. 3919.59 Crs.

TARIFF Rs. 3.54 per KWH


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PARBATI H.E. PROJECT STAGE-II (800MW)

UNIQUE HIGHLIGHTS

1. Two inclined pressure shafts of 1546M length each at an

inclination of 300 successfully bored for the first time in the

world by using Tunnel Boring Machine and completed in record

time of 16 months.

2. Concreting & Grouting in the inclined pressure shafts, behind the

steel liners had been done up to a height of 800 meter by using

Schwing pump for the first time in World.

3. Total length of Head Race Tunnel is 31.52 km which is the longest

hydro tunnel in Indiabeing constructed.

4. In the Dam area, the weak zone of the hill (Fossil Valley) grouted

successfully up to a depth of 120 m in two stages with ultra fine

cement of high Blaine value imported from Japan, for the first

time in India.


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STATUS OF WORKS

ITEMS UNIT TOTAL COMPLETED

Dam & Intake

Concreting

cum 1.96Lakhs 1.78Lakhs

(90.8%)

HRT Excavation km 31.525 26.61 (84%)

HRT Lining km 31.525 15.586 (49.4%)

Surge Shaft

Excavation

m 130 Completed (100%)

Surge Shaft Lining m 130 50.9 (39.15%)

Pressure Shaft

Excavation

m 2 x 1546 Completed

(100%)

Pressure Shaft

Steel Lining and

Concreting

m 2 x 1545 Completed

(100%)


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STATUS OF WORKS

ITEMS UNIT TOTAL EXECUTED

Power House Sub-

Structure Concreting

cum 28416 28416 (100%)

Power House Super-Structure Concreting

cum 25000 3398 (13.6%)


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DAM CONCRETING


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INTAKE STRUCTURE CONCRETING


PARBATI H E PROJECT STAGE II (800MW)


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CONCRETING IN DESILTING CHAMBER


PARBATI H E PROJECT STAGE II (800MW)


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Status of Head Race Tunnel (Excavation)

(Drawing not to scale)

Inlet Adit

F-3F-2F-1F-0 F-8 F-11

Total 31.525 Km

6251m 13099m 2038m 7375m 2434m

F-4 F-6 F-7 F-9 F-10

Adit-II Adit-III

Adit-IV Adit-V

215m

LEGEND

COMPLETED 26610m

BALANCE 4915 m


Adit-I


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POWER HOUSE CONCRETING WORK


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POWER HOUSE CONCRETING WORK


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Inclined Pressure Shaft (Right)

Total Length- 1545 m

Excavation Completed- 1545 m (100 %)

Lining Completed (100%).

INCLINED PRESSURE SHAFTS

Inclined Pressure Shaft

2 Nos., Steel Lined 3.5m Dia.

Each bifurcating into two Nos. 3m Dia.Penstocks near Power House

Inclined Pressure Shaft (Left)

Total Length- 1545 m

Excavation Completed- 1545 m (100 %)

Lining Completed -1545 m (100%)

300 300


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Problems Encountered During Execution of Project

A. Head Race Tunnel :

Severe Rock Bursting due to high superincumbent cover

(upto 1.6 km)

Heavy sudden ingress of water of the order of 8000 lpm

with 7000 cum discharge of silt encountered in the tunnel

which had buried and damaged the TBM.

TBM refurbished and the fault zone treatment being taken

up in consultation with international experts.


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Submergence of TBM due to sudden heavy ingress of water


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Submergence of TBM due to sudden heavy ingress of water


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Problems Encountered During Execution of Project

B. Powerhouse :

Occurrence of three major slides of Power House Back slope during

Apr04, Jun06 and Feb07.

C. Dam :

Ban on Aggregates:

Hon'ble High Court H.P had imposed ban on 03.08.07 onprocurement of aggregate from any mining source in Distt. Kullu

for all mega projects, which was lifted in March 2008. The work of

Dam and other concreting was stopped during this period of 7

months.


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presentation 2011 sept phep3 modified

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