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2.1 UNIT-I (DAM AND APPURTENANT WORKS)

The contract for construction of main dam under Unit-I was awarded to M/s. Jaiprakash Associates (JPA) in April 1987 at a tendered cost of ` 320 crore stipulating a period of 110 months (up to June 1996) for completion of dam including installation of spillway gates. Because of certain difficulties in mobilization of labour and machinery, the implementation schedule was revised in December 1989, increasing the completion time to 129 months. 

The construction schedule of main dam could not be adhered to, mainly due to the constraints associated with the resettlement and rehabilitation of the project affected persons. The construction works remained held up for about four years due to the writ petition filed by the Narmada Bachao Andolan (NBA) in the Supreme Court. The Supreme Court in its final judgment on 18th October 2000 gave directions for the immediate raising of the dam up to EL 90.00 m with direction to the Narmada Control Authority (NCA) to give permission for further raising of the dam on pari-pasu completion of the R&R and Environmental measures and completion of dam as per the award of NWDT.

The NCA, which is monitoring the Resettlement and Rehabilitation (R&R) Programme of SSP, in its 61st meeting held on 17-11-2000 has finalized an action plan for completion of R&R works which was also accepted by the Review Committee of Narmada Control Authority (RCNCA) in its 8th meeting held on 10.01.2001. 

2.2 OVERALL PROGRESS OF UNIT-I MAIN DAM

The work of raising the blocks no. 30 to 46 upto EL 90.00 m was completed on 30-12-2000. Permission for rising of the effective dam height to EL 95.00m was given by NCA in its 64th meeting held on 17th May 2002, and the work was completed by middle of July 2002. Permission for further raising the spillway blocks to EL 100 m was given by the NCA in its 66th (Emergency) meeting held on 14th May 2003 along with permission to construct 3.0 m high hump on blocks no. 31 to 45, leaving the blocks no. 30 and 46 as such. This work was completed by the end of June 2003. Subsequently, the NCA in its 70th meeting held on 13th March 2004 granted permission for raising the blocks no. 30 to 46 to EL 110.64 m. This work of concreting commenced on 17th March 2004 and was completed on 30th June 2004. During the period (2004 to 2006) the R&R and Environmental activities were carried out. In 76th meeting of NCA held on 8th March 2006, clearance for further rising of dam height upto crest level (EL 121.92m was given which was achieved on 31st December 2006. The Narmada Control Authority (NCA) in its 86th (Emergency) meeting held on 12th June 2014 permitted SSNNL to carry out Phase-I proposal comprising construction of piers, overhead bridge and installation of gates in open or raised position at SSP. Accordingly, related construction activities have started.

The schedule of raising of dam height from EL 80.30m upto 121.92 m is shown in Table 2.1.

TABLE 2.1 The schedule of raising of dam height from EL 80.30m to EL 121.92 m and above

S.No

Height of Spillway Block Level

Date of achievement

Remarks

1.

80.30 m

May 1995

Raising of dam height was stopped as per direction of Supreme Court.

2

85.00 m

April 1999

Raising of dam height as per direction of Supreme Court.

3.

90.00 m

December 2000

4.

95.00 m

July 2002

As per Supreme Court directives permission to raise the dam height from EL 90m to EL 95m was given by NCA in its 64th meeting held on 17th May 2002.

5.

100.00 m

 

Permission to raise the dam height from EL 95m to EL 100m was given by NCA in its 66th meeting held on 14th May 2003.

6.

110.64 m (MDDL Level)

June 2004

Permission to raise the dam height from EL 100.00 to EL110.64 m was granted in the 70th meeting of NCA held on 12-13th March 2004.

7.

119.00 m

July 2006

Permission to raise the dam height from EL 110.64 to EL121.924 m was granted in the 76th meeting of NCA held on 8th March 2006.

8.

121.92 m (Crest Level of spillway)

December 2006

9.

Above 121.92 m (Crest Level of spillway)

In progress

Permission to raise the height of dam by NCA in its 86th (Emergency) meeting of NCA held on 12th June 2014 permitted SSNNL to carry out the work of dam height above EL 121.92m Phase-I proposal comprising construction of piers, overhead bridge and installation of gates in open or raised position at SSP.

       

 

Table 2.2 shows the total quantities of excavation, concreting, drilling and grouting for main dam, the overall progress achieved up to March 2016.

TABLE 2.2

PROGRESS OF MAIN DAM (UNIT-I) WORKS UPTO JUNE 2016

Item

Unit

Est. Qty.

Progress up to Dec. 2015

Progress during reporting period

Cumulative Progress up to June 2016

Percentage Progress up to March 2016

Excavation

TCM

6400

6360.71

00.00

6360.710

99.39

Concreting

Dam

Stilling Basin

Sub-Total

 

TCM

TCM

TCM

 

5620

1200

6820

 

5313.366

1425.580

6738.946

 

5.414

1.866

7.280

 

 

5318.780

1427.446

6746.226

 

94.64

118.95

98.92

 

Drilling & Grouting

TRM

282

250.45

00.00

250.45

88.81

Note: TCM: Thousand Cubic Metre       TRM: Thousand Running Metre

Table 2.3 indicates the year-wise (upto June 2013) concreting programme and the achievements thereof.

TABLE 2.3
YEAR-WISE ACHIEVEMENT IN CONCRETING

(in nearest hundreds cum.)

Year (Ending June)

Target as per RIS/89(Restructured)

Achievement (Estimated Qty: 68200)

 

Annual

Cumulative

Annual

Cumulative

Percentage

1987

100

100

105.68

105.68

0.15

1988

1460

1560

1459.21

1564.89

2.29

1989

1210

2770

1212.91

2777.80

4.07

1990

4300

7070

4301.63

7079.43

10.38

1991

10000

17070

10138.33

17217.76

25.25

1992

9500

26570

9332.47

26550.23

38.93

1993

10900

37470

10906.94

37457.17

54.92

1994

8430

45900

8436.51

45893.58

67.29

1995

11500

57400

6308.19

52201.87

76.54

1996

8500

65900

2837.05

55038.93

80.70

1997

1700

67600

1266.68

56305.61

82.56

1998

600

68200

207.74

56513.35

82.86

1999

----

68200

1834.42

58450.00

85.70

2000

----

68200

60.00

58510.00

85.79

2001

----

68200

1088.30

59598.30

87.39

2002

----

68200

860.40

60458.70

88.65

2003

----

68200

1076.00

61534.70

90.22

2004

----

68200

2051.10

63585.80

93.23

2005

----

68200

202.10

63787.90

93.53

2006

----

68200

1124.70

64912.60

95.18

2007

----

68200

845.50

65758.10

96.42

2008

----

68200

8.20

65766.30

96.43

2009

----

68200

0.00

65766.30

96.43

2010

----

68200

0.00

65766.30

96.43

2011

----

68200

0.00

65766.30

96.43

2012

--

68200

0.00

65766.30

96.43

 2013

--

68200

0.00

65766.30

96.43

2014

--

68200

0.00

66088.26

96.90

2015

--

68200

1301.15

67389.41

98.81

2016

--

68200

72.85

67462.26

98.92

Work done prior to award of contract…

5550.00

 

 

 

 

 

 

2.3 PROGRESS OF BLOCK LEVELS

The minimum block levels to be attained at the end of each construction year (as per RIS December 1989) and the level actually achieved at the end of June 2016 are shown in Table 2.5 and Fig. 2.2.

MINIMUM BLOCK LEVELS (June 2016 )

Ending December

Minimum block level (m)

As per Contract Award

As per RIS 12/89

Achieved

1991

45.00

23.00

25.50

1992

75.00

45.00

33.00

1993

85.00

65.00

59.00

1994

111.00

85.00

69.00

1995

121.92

110.00

80.00

1996

138.68

121.92

80.30

1997

--

138.68 (FRL)

80.30

1998

--

--

80.30

1999

--

--

85.00

2000

--

--

90.00

2001

--

--

90.00

2002

--

--

94.00

2003

--

--

100.00

2004

--

--

110.64

2005

--

--

110.64

2006

--

--

121.92

2007

--

--

121.92

2008

--

--

121.92

2009

--

--

121.92

2010

--

--

121.92

2011

--

--

121.92

2012

--

--

121.92

 2013

--

--

121.92

2014

--

--

121.92

       
       

2015

--

--

121.92

       

 June 2016

--

--

 121.92*

* EL 121.92m is the crest level.

   Non-over flow blocks level raised to EL 146.50m (top of dam, final level).

 

2.4 PROGRAMME & PROGRESS DURING REPORTING PERIOD

 

Progress of excavation and concreting upto June 2016 is given in Table 2.4.

TABLE 2.4
PROGRESS OF EXCAVATION AND CONCRETING

 

(In Thousand cum metre )

Month and Year

Progress

Cumulative Progress

Excavation

          Upto Dec. 2015

 

 

6360.710

Jan. 2016 to June 2016

00.00

6360.710

Concreting  

           Upto Dec. 2015

 

 

6738.941

Jan. 2016 to June 2016

7.285

6746.226

 

2.5 PROGRESS OF MAIN DAM INSTRUMENTS

In all, 432 instruments are to be installed in blocks No 13, 18, 23, 25, 34, 37, 43, 47, 51, 55 and 58. There is provision of Instrumentation Observation Cabin in Block No. 34.

The contract for supply and installation of instruments amounting to Rs.1.32 crore has been awarded to M/s. Huggernbarger, Switzerland on 07.03.1988 M/s Mekastar Pvt. Ltd. is their Indian agent for installation and data acquisition. All 432 Nos. of instruments have been procured. Till the present reporting period, 379 instruments have been installed and only 53 numbers of instruments are remaining to be installed.

 

2.6 RIVER SLUICE GATES AND STOPLOGS

The work of design, fabrication and supply of River Sluice Gates and Stoplogs amounting to Rs. 5.15 crores was awarded to M/s. Triveni Structures Limited Allahabad and supply has been completed for 1315.05 MT gate parts. All the four Service and Emergency gates with their hoisting arrangement have been installed and commissioned. Four stoplogs were also installed and commissioned.

2.7 PENSTOCK GATES AND STOPLOGS

The work of design, fabrication and supply of Penstock Gates and Stoplogs amounting to Rs. 7.82 crores was awarded to M/s. Tungbhadra Steel Products Limited (TB Dam, Hospet, Karnataka) and supply has been completed for 2065.00 MT gate parts. Installation and commissioning of penstock gates were completed. Power cables are yet to be supplied. The work of installation of stoplogs will be takenup after installation of gantry crane and installation of Gantry Crane is under progress.

2.8 CREST RADIAL GATES AND STOPLOGS

The contract for the design, fabrication and supply of 30 Nos. Crest Radial gates and Stoplogs amounting to Rs. 40.24 crores has been awarded to M/s. Tungabhadra Steel Products Limited (TB Dam, Hospet, Karnataka) for tendered quantity of 13452 MT which has been revised to 13059.64 MT. The supply has been completed. Dam Height has reached upto the crest Level of 121.92 m as on 31st December 2006. The Narmada Control Authority (NCA) in its 86th (Emergency) meeting held on 12th June 2014 permitted SSNNL to carry out Phase-I proposal comprising construction of piers, overhead bridge and installation of gates in open or raised position at SSP. Accordingly, related construction activities have started.

2.9 PROGRESS OF IRRIGATION BYE-PASS TUNNEL (IBPT)

A decision for construction of IBPT was taken in the 60th meeting of the NCA held on 18.07.2000 at New Delhi. The Irrigation Bye-Pass Tunnels (IBPT) arrangement comprises of two - 5.5 m diameters - tunnels across the right bank hill, connecting the main reservoir with the first irrigation pond. The twin IBPTs, with invert level of EL 88.39 m at the inlet, will have a discharge capacity of about 283.12 cumecs (10000 cusecs) at reservoir water level of 97.54 m and 441.66 cumecs (15000 cusecs) at reservoir water level of 110.64m.

The works of both the tunnels have been completed in May 2008. Wet testing of service gate of IBPT was carried out successfully on 15-09-2010 during overflow condition. Quantities of main items executed for IBPT works is given in the Table 2.6.

TABLE 2.6
PROGRESS OF IRRIGATION BYE-PASS TUNNEL (IBPT)

 

 

(In Lakh cum meter)

Item

Unit

Quantity Executed

Status of work

Open Excavation

LCM

7.346

completed

Tunnel & Shaft Excavation

LCM

0.318

completed

Concreting

LCM

1.608

completed

Installation of Gates (i/c liner)

Tonne

2473

completed

2.10 FLOODS, RESERVOIR REGULATION & NON-STRUCTURAL MEASURES.

The topographical features of Narmada basin are peculiar and very much different from other river basins specially, in regard to the movements of floods. These features have the effect of increasing the peak discharge and steeping the slopes of the flood hydrograph, thereby creating very heavy intensity floods. Unprecedented floods were recorded in Narmada Basin in the year 1968, 1970, 1973 & 1994. The flood of 1970 was having peak discharge of 24.50 lac cusecs, which is considered to be equivalent to 1 in 100 year return flood. The flood of 1994 was having peak discharge of 25 lac cusecs. The design flood corresponding to 1000-year return period has been estimated as 30.70 lac cusecs (87000 m3/ sec).

To implement non–structural measures, Sardar Sarovar Reservoir Regulation Committee (SSRRC) was constituted by NCA. In SSRRC meetings quick and judicious decisions are taken for proper and effective utiization of Narmada waters by the party states as per the NWDT award. First meeting of SSRRC was held on 24.02.2005 at New Delhi under the chairmanship of Executive Member, NCA with its members from NCA, CEA, CWC and concerned party States.


The matter regarding providing non-structural measures for controlling the Irrigation Bye Pass Tunnel was also discussed in Hydro-met Sub Group of NCA. In the minutes of 8th meeting of Hydro-met Sub Group held at New Delhi on 15th January 2008 under “Item No. VIII-5(59) Development of Control Mechanism For Operation of Irrigation By-Pass Tunnel (IBPT) at Sardar Sarovar Project” it is stated that:

“Member Secretary informed that the technical specifications framed by CWC were sent to the members and invitees of the Sub group for their comments/suggestion. So far the comments of GOG and GOM only received. GOM has no comments on the specifications except that its cost will not be shared by them. GOG has sought to incorporate the provision in the control mechanism of IBPT to operate the service gates below MDDL, i.e. EL 110.64 M. in case of emergency with the permission of the competent authority. The representative of GOMP referred to the decision taken in the 9th Meeting of RCNCA, in which lowering of water level of reservoir through IBPT below 110.64m has been forbidden. Member (Civil), NCA stated that it would be a technical provision in the mechanism to be activated only after getting the approval of the competent authority. Having the provision does not mean that it would necessarily be operated. Secretary, NCA clarified that operation of IBPT below MDDL has not been forbidden. In fact, the notional loss of power generation due to such depletion shall be compensated by the GOG. The Chairman opined that such technically required provisions may be incorporated in the control mechanism for use only during acute emergencies with the permission of the Chairman, NCA. After detailed deliberation, it was decided that the provisions proposed by GOG can be accepted as a technical requirement in the control mechanism for IBPT. The provisions of water level sensors could be decided as per the work requirements and site conditions for which CE, NCA and Dir. (T), NCA shall visit the site in the due course of the time”.

As per above decision the NCA officers visited the project site in February/ March 2008. After above visit it was decided to prepare comprehensive report to be placed before NCA as there is a deviation from the suggestions of CWC regarding sensor arrangement. Further SSNNL sent all the details for level measurement and wireless remote data transmission, indication and control system for IBPT and deputed their officers to NCA in January 2010 for discussions. The matter was also discussed during the XIIth meeting of Hydromet Sub-Group held at New Delhi on 26.02.2010. In this meeting it is decided to link gate control mechanism of IBPT with the existing RTDAS network station at Sardar Sarovar Project and other at Gujarat-Rajasthan border for monitoring the delivery of water to Rajasthan in accordance with mandate given by NWDT.

Various agencies were contacted by SSNNL for installation of non-structural control measures (Sensor arrangement) for Service gates of IBPT as per Guidelines of CWC. The proposal furnished by M/s Vidyut Industries, Ahmedabad was discussed by Executive Engineer, N. P. Dam Div. No-2, Kevadia with Director (Telemetry), NCA. The proposal was found by and large in order in the line of CWC specification. Further actions are being taken by NCA to accommodate these sensors in NCA’s RTDAS system.


The Safe carrying capacity of the Narmada River below Sardar Sarovar Dam is only about 7.5 lacs cusecs while outflow proposed by tribunal with reference to design flood is 22 lacs cusecs. However, danger level at Bharuch, which is an important town located downstream of Sardar Sarovar Project is attained even with a flood of about 4 to 5 lacs cusecs.

As per the decisions of the NWDT, a reliable Hydro- meteorological network is required to be established in Narmada Basin for the purpose of formulation of flood forecasts in the basin, inflow forecasts to the reservoirs, and reservoir regulation of supplies from the Indira Sagar Project to Sardar Sarovar Project to meet the irrigation and other needs of Gujarat and Rajasthan. Accordingly, Narmada Control Authority is establishing a Real Time Data Acquisition System (RTDAS) in Narmada Basin. The RTDAS System planned to establish in Narmada Basin will have 96 Remote Stations (RS) and a Master Control Centre (MCC) at Indore M.P. to be implemented, in two phases

Real Time Data Acquisition System (RTDAS) for Narmada Basin has been planned initially with 26 Remote Stations (RS) in the first phase. Out of these 26 RS, 1 is in Gujarat at Sardar Sarovar Project and 1 Meteorological station is in Maharashtra at Dhadgaon. M/S Electronics Corporation of India Ltd (ECIL), Hyderabad has been awarded this work.

However, the software for flood forecasting though developed was not giving satisfactory results within the permissible limits as prescribed in the contract.

M/s ECIL has handed over 19 stations and master control centre Indore and accordingly the maintenance warranty started w.e.f. November 2007. For balance 7 stations M/s ECIL was asked to revive by 30th November 2007.

During 96th meeting of PSC of SSCAC held on 21.1.2009 it was informed that M/s ECIL could revive three more stations only out of remaining 7 stations and that they were not in a position to revive balance 4 stations at this stage. It was decided that contract with M/s ECIL be foreclosed with taking over of 3 more remote stations in addition to 19 station taken over earlier. The components of warranty and annual maintanance may continue to be executed in respect of taken over stations as per contract provisions.

SSCAC in its 76th meeting held on15.6.2009 decided that the contract with M/s. ECIL, may be foreclosed as per contract document, and further action be taken by NCA Secretariat accordingly. It is emphasized by the Chairman in 77th meeting of SSCAC that effective Decision Support System (DSS) need to be developed in an integrated manner with latest technology to ensure optimum reservoir operation. Hydromet Sub Group of NCA in its 13th meeting on 30.08.2010 has finalized a network of 40 stations and master Control Centre on GSM/ GPRS communication technology for operationalization of RTDAS. Hydromet Sub Group in its 15th meeting held on 14.11.2011 decided as under :

  1. The Sub-group unanimously approved the GSM based two way communication technology as provided in the RFP document for adoption in the implementation of RTDAS network in Narmada Basin.
  2. The operating system and other specification should be clearly identified and mentioned in the RFP document so that uncertainty and higher cost in tender document due to it could be avoided.
  3. It was also decided by the Sub-group that the tender process which till now has been kept in abeyance may also be revived appropriately.

For development of water Management Software for inflow forecasting and Water Accounting an expert committee to meet alongwith an approach paper and should decide about the specification of the software/accuracy of forecasts, type of rainfall runoff model and also taken into consideration as to how the Quantitative Perceptive Forecast (QPF) cold be utilized in issuing flood forecast in Narmada Basin.

Pursuant to a decision taken by the Hydromet Sub-Group in its 15th meeting on the issue of development of appropriate rainfall run-off model for real time inflow forecasting for Narmada Basin a consultation cum brainstorming session was held at New Delhi on 14th November 2011.

According to decision taken in above brainstorming session IIT, CEDAC & NIH were requested to develop an appropriate ready to use rainfall run off model for real time inflow forecasting of Narmada Basin in R&D mode using their own resources. NCA will extend full cooperation and will also make data available for testing the model. NCA will also assist in getting R&D funding from MOWR or DST.

UNIT-III (HYDRO POWER WORKS)

The hydropower complex for generation of power from the project comprises of two power-houses viz. River Bed Power House (RBPH) with installed capacity of 1200 MW and Canal Head Power House (CHPH) with installed capacity of 250 MW. As per the initial planning, the partial benefits of Power/Irrigation from the Project were initially programmed to be derived in the year 1994-95 along with the raising of the Main Dam blocks to Minimum Draw down Level (MDDL) of 110.64 m. The planned progress and the resulting benefits however could not be realized due to various constraints. The dam height has been achieved upto crest level (EL121.92m) by the end of December 2006.
As per decision taken in the 74th meeting of SSCAC held on 27th September 2006 on Insurance Coverage for Sardar Sarovar Project, an Empowered Committee was constituted under the Chairmanship of Executive Member, NCA, consisting of members nominated by the Party States as well as Central Electricity Authority (CEA) and NCA, with Secretary (SSCAC) as its Member Secretary. The Committee held 3 meetings on 19.02.2007, 01.06.2007 and 13.06.2007 respectively.

The report of the Empowered Committee was discussed in the 75th SSCAC Meeting and the recommendations were accepted. The Committee decided that Standard Fire and Special Perils Policy i.e. Fire + RSMD (Riot, Strike, Malicious Damage) + Earthquake + Terrorism + STFI (Storm, Tornado, Flood, Inundation) without loss of production and without machinery breakdown may be taken up for Sardar Sarovar Power Project. Further, in 76th SSCAC meeting held on 15.06.2009, it was decided that the insurance premium is shareable by the three party States (GOMP/GOM/GOG) in the ratio of 57:27:16.

In 80th meeting of SSCAC held on 25.03.2013 committee directed Member (Power) NCA to frame guidelines/scope of insurance policy in Power Subcommittee of NCA and send to PSC of SSCAC for finalization. GoG should use these guidelines/scope for inviting bids from all companies.

2.12 RIVER BED POWER HOUSE (RBPH)

RBPH is an underground Powerhouse located on the Right Bank of the river and is about 165 m downstream of the dam with approach tunnel of 1.5 km. length. RBPH has six units of 200 MW each, deploying Francis type reversible turbines. 

2.13 CIVIL WORKS OF RBPH CAVERN & OTHER UNDERGROUND WORKS

The contract for civil works of the Power House amounting to Rs.40.42 Crore was awarded to M/s. Jaiprakash Associates on 7th July 1987 with stipulated completion in 93 months i.e by April 1995.
The Revised Implementation Schedule (RIS) of June 1991, approved by the SSCAC stipulated commissioning of first Unit of the RBPH on 1st September 1995.

The civil works of RBPH were however delayed due to development of distress zone in walls of the powerhouse cavern. Further excavation was stopped and the affected zones were treated. It was decided to take up further work along with strengthening of the already excavated portion and embedments for the installation of TG Sets with the arrival of equipments at site.

In addition to the above-mentioned reasons there was delay in procurement of Turbine Generator Sets (T.G. Sets), due to which the target dates of RIS of June 1991 could not be achieved. In fact, the civil works of RBPH had been suspended due to delay in supply of embedded parts of T.G. Sets. However the issue of the procurement of T.G. sets was settled with M/s. Sumitomo Corporation, Japan and Contract amendment and loan Agreement were signed on 30th Sept. 1998. The equipments for pump turbines for Unit 1 and 2 were received at site in June 1999, then the balance excavation work in the powerhouse cavern was started. The work of Power Houses completed by 31.12.2006.

The detailed item-wise progress of works under this contract has been highlighted in Table 2.7.

TABLE 2.7 UNDER GROUND ITEM-WISE PROGRESS OF CIVIL WORKS

Item of Work

Status of works

Machine Hall

The Machine Hall involves 210.770 Th. m3 (revised quantity) of underground excavation and 63.926 Th. m3 (revised quantity) of concreting. All works including the RCC Columns and Beams for EOT Crane in the Service Bay, EOT crane beams on downstream and upstream side including stitching with cable anchors have been completed.

Bus galleries and shafts

Excavations of all the three bus galleries, bus shafts, lift well and drainage & grouting of galleries has already been completed. The concrete lining in all three bus-shafts has also been completed.

Draft tube tunnels

Draft tube (D.T.) tunnels no.1 to 6 has been completed in all respet. The total quantity of excavation and concreting D.T. tunnels 141.900 th. cu m and 76.734 th. cu m respectively. The total quantity of shotcreting and rock bolting (25mm dia.) D.T. tunnels 28.091 th. sq m and 18.655 th. r m respectively has been completed.

Pressure Shafts

All six-pressure shafts no.1 to 6 has been completed in all respect. Quantity of open excavation, excavation (tunneling), concreting, shotcreteting & rock bolting is 32.000 th. cu m, 66.125 th. cu m, 29.685 th cu m, 22.451 th sq m & 4.620 th r m respectively has been completed.

Collection Pool

Work of open excavation 582 th.cu m and concreting 47.553 th.cu m has already been completed. The concrete work of gate guide piers completed in all respect. The total quantity of shotcreting and rock bolting 28.251 th. sq m and 7.895 th. rm respectively has been completed. The work of installation of all six Draft Tube gates and Civil works of collection pool has also been completed.

Exit tunnels, tail pool and Trash rack

All work of three exit tunnels and tail pool completed in all respect. Open excavation, U/G excavation, Concreting Shotcreting & Rock bolting are 1089.337 cum, 177.483 cum, 81.306 cum, 25.353 sqm. & 11.052 th m. respectively. All three-trash rack structures have also been completed, and trash racks have been placed.

The overall progress achieved is listed in the Table 2.8.

 TABLE2.8

OVERALL PROGRESS OF UNDERGROUND CIVIL WORKS OF RBPH

S. No.

Item

Unit

Total Quantity (Revised)

Quantity Completed

Percentage of Completion

1

Open excavation

Th Cu m

1655.023

1655.023

100%

2

U/G excavation

Th Cu m

706.580

706.580

100%

3

Concreting

Th Cu m

314.904

315.155

100%

4

Shotcreting

Th Sq m

194.595

194.595

100%

5

Rock bolting

Th Rm

152.852

152.852

100%

6

Cable anchors

(a)50T capacity

(b)120 T capacity

 

Th Rm

Th Rm

 

6.980

4.586

 

6.980

4.586

 

100%

100%

7

Steel Supports

MT

7059.963

7059.963

100%

 

2.14 PROGRESS OF OTHER CIVIL WORKS OF RBPH

The detailed item-wise progress of other civil works of RBPH is given in Table 2.9

 TABLE 2.9

ITEMWISE PROGRESS OF OTHER CIVIL WORKS OF RBPH

Item of Work

Status of works

Fabrication and erection of penstocks

The contract for fabrication and erection of Penstocks was awarded to M/S Indian Hume Pipe Co. Ltd. in July 1986.The excavation of all the shafts and the fabrication of entire quantity of 4520.289 MT (revised) of ferrules have been completed. Installation or penstock No.1 to 6 has been completed. Installation of Bulk Heads has also been completed.

Supply and erection of trashrack, draft tube gates & stoplogs in collection pool

Total quantity of steel work envisaged for the works is 1980 MT (revised) out of which about 502 MT is of Trash Racks and balance 1478 MT is for DT Gates and their embedded parts and hoists. Fabrication and erection of all the six sets of DT gates and fabrication of all the three sets of Trash Racks has been completed. The erection of trash rack screen has been completed on 30.06.04.

Tail race channel

The total quantity of excavation is about 2058.386 Th cu m, while total quantity of concreting is 53.56 Th cu m. Civil work has been completed in all respect on 30.6.2004.

Switchyard building Works

Excavation and construction work for the 400 KV GIS Switchyard Complex for U/G RBPH has been completed in all respects on 31.12.1999 & 29.2.2000 respectively.

Garudeshwar weir

Estimate and DTP for construction of Garudeshwar Weir approved by the SSCAC in its 73rd Meeting held on 3rd August 2005. In 79th SSCAC meeting held on 16th March 2012. SSCAC approved the revised cost estimate for Rs.418 crores. Construction work of Garudeshwar Weir is awarded the lowest bidder M/s. Rithwik Pvt. Construction Ltd., Hydrebad on dated 04.05.2012 for Rs.299.4 crores to complete in 48 months and construction work started on 08.02.2013. Construction of approach roads, diversion structure, excavation and coffer dam is in progress.

2.15 RBPH ELECTRICAL WORKS

The order for supply of 6 units of 200 MW Pump Turbine/ Motor Generator Sets (T.G. Sets) was awarded to M/s. Sumitomo Corporation, Japan on 13th August, 1987 for 24646.161 million Yen (Rs.355.1 Crore) plus Rs. 35.51 Crore. Some embedded parts of Pump-Turbines and Generator-Motors were supplied by M/s. BHEL, Bhopal. For this contract, Overseas Economic Co-operation Fund (OECF), Japan had agreed to finance for purchase of T.G. Sets. OECF released 1st tranche of 2.85 Billion Yen but further OECF loan/ assistance was stopped due to environmental concerns raised in the Parliament of Japan. Later M/S Sumitomo raised claim towards storage, interest and escalation charges.

A negotiating team was constituted by Government of India comprising of representatives from party states and Government of India to discuss various issues with M/s. Sumitomo Corporation and explore alternative sources for funding of the T.G. Sets. Eight meetings were held by the negotiating team with M/s. Sumitomo Corporation and the matter with M/s. Sumitomo Corporation was settled. M/S Sumitomo agreed to withdraw their storage and interest charges and variousother claims and also agreed to provide supplier’s credit for Japanese portion of supply with certain modifications of contract. The contract was amended and loan agreement with Sumitomo signed on 30th September 1998.

All T.G. Sets have been supplied, erected and commissioned. The detailed item-wise progress of different components of electrical works of RBPH, at the end of June 2013 is given in Table 2.10.

TABLE 2.10
ITEM-WISE PROGRESS OF ELECTRICAL WORKS OF RBPH

Item of Work

Status of works

Supply of Turbine generator sets (RBPH)

Against the targeted supply worth 23194.709 million Yen+Rs.96.22 crore M/s sumitorno has shipped a total material worth 22604 million Yen. BHEL has also supplied equipment worth Rs.91.84 crores (ex-factory), against intended supply of Rs. 96.22 crore.

Erection of Turbine Generator Sets

The tender for erection of TG Sets has been finalised and the LOI placed with M/S PES Engg. Hyderabad in December 1999 at a tender cost of 9.598 crores. The erection work commenced in June 2000 under the supervision of M/S Sumitomo's supervisors. All T.G. Sets have been commissioned.

EOT cranes

Contract for E.O.T. Crane was awarded to M/S. Greaves Cotton & Co. Ltd. On 29.03.1989 for Rs. 152.04 lakhs. Mechanical and electrical works of both the cranes are completed The EOT crane is operational upto Unit-VI.

250 MVA Generator Motor transformer

Work order for supply and supervision of erection of 6 nos. of 250 MVA, 13.8/420 KV generator motor transformer placed with BHEL on 23.05.2003 for an amount of Rs.25.71 crore. GT1 commissioned on 1.2.05, GT2 on 30.4.05, GT3 on 30.8.05, GT4 on 13.10.05, GT5 on 7.3.06 & GT6 on 11.5.06.

24 KV generator circuit breaker & disconnector

Work awarded to M/s ABB Switzerland on 04.02.2004. GCB for all units have been received at site, installed & commissioned.

24 KV isolated phase bus ducts (IPBD)

Work awarded to M/s BHEL Jhansi on 18.10.2003 for an amount of Rs. 13.91 crore. Supply of IPBD for all Units completed, erected & commissioned.

1000 KVA UAT & 2000 KVA SST

Work awarded to M/s Cromption Greaves Ltd. Mumbai on 02.09.2003 for Rs. 86.19 lacs. All the UATs & SSTs received at site, erected and commissioned.

220 KV/400 KV gantry structure & post insulators

Order for work placed on 07-01-1995 with M/S Bhagyodaya Steel Industries Baroda for Rs.36.17 lacs. All works completed.

415LTswitchgear panel boards & non-segregated LT bus duct

Work awarded to M/s MEM, New Delhi on 08.01.2004. LT Bus Ducts, UAB For 6 units and SSB-A&B and SDB- A, B, C received and commissioned.

Computerised Control system

Order placed to M/s Siemens Ltd on 5.4.06. Panel drawing Input/output finalized. Supply of Panels & materials and erection work completed. System has been completed and commissioned on 14.06.2010.

A.C. & Ventilation System

LOI issued to M/s. Blue Star Ltd., Vadodara on 27.07.2004. The system is in service.

Power and Control Cables

LOI issued on dated 07.04.2004 to three firm (1) M/s. Ravin Cables (2) M/s. Diamond Cables (3) M/s. Suyog Electricals. M/s. Diamond Cables failed to supply cables, hence revised price bids invited & revised orders placed on M/s. Suyog Electricals Pvt. Ltd., dated 01.06.2004 & 08.06.2004. M/s. Ravi & M/s. Suyog has supplied all the ordered quantity.

D.C. System

LOI issued dated 13.05.2004 to M/s. Dhwami, Vadodara for Battery sets & M/s. Caldyne, Calcutta forBattery Chargers & DCDB’s. All materials are received at site, erected and commissioned.

Loudophone for RBPH

LOI issued to M/s. BNA Technologies Ltd on dated 16.08.2006. Materials supplied, installed and commissioned. The system is put in operation for RBPH.

Other Electrical Equipment

Supply and erection of 5 Nos. 63 MVA/11 KV 220 KV power transformer, LT switchgear, 5 Nos. 500 KVA, 11/0.415 KV unit auxiliary transformer, 2 Nos. 1000 KVA, 11/0.415 KV Station transformer, 245 KV current transformers, Control and protective equipments has been completed.

Gas Insulated switchgears (GIS) equipments

Contract for procurement of 400KV GIS switchyard equipment was signed with M/S GEC Alsthom, France on 20.08.1992. The same was amended at revised contract value of 194.644 million French Francs plus Rs. 0.7352 crore. The erection of all GIS (Gas Insulated Switch gear) bays and GIB (Gas Insulated Busbar) bays have been completed; including gas filling, pre-commissioning H.V. testing and die-electric testing. GIS charged on 07.12.2004. Maharashtra, M. P. & Gujarat are connected through SSP using 400 KV Dhule-1&2 (MSEB), Nagda-I&II, & Kasor, Asoj (GEB) lines respectively.

Auto transformer (315 MVA)

Contract for procurement of two nos. of 315 MVA Auto Transformer was awarded to M/S BHEL on 16.04.1994 for Rs. 9.2416 crores. The transformers along with accessories have been received at site and the erection work of Auto-Transformer is completed including testing and pre-commissioning tests. Auto Transformer No-1 & 2 charged & connected to the grid through 400 KV GIS on 07.06.2005

Control relay panels & protection equipment

The contract for feeder & Autotransformer control/rely panels was awarded to M/s. ABB Bombay on 28.11.1994 amounting to Rs. 2.586 Crores. All 23 nos. of C/R panels for feeder auto transformer have been received at site. All these panels are commissioned and are in service. For control panels of Generator motor & Generator transformer order was placed to M/s. Alstom, Vadodara on 29.01.2004. All these panels are commissioned and in service.

PLCC equipments

Contract awarded to M/s ABB (for PLCC equipment & material) and M/s Alsthom (for CVT and Wave Trap) on 9th Feb. 2004. Full materials from M/S ABB and M/S Alsthom have been received at site, installed & commissioned.

220 KV Switchyard

The work of erection of 220 KV Switchyard structure is completed. Erection of Isolator, Breaker, Lightening Arrestor, Current transformer, Power transformer etc. is completed. Erection of Control and Relay Panel and cabling work has also been completed.

EOT Cranes

Work of EOT Crane for CHPH was awarded to M/s. Furnace and Foundry Equipment Co., Bombay at the cost of Rs.109.83 lacs. Cranes are erected and complete in all respect and are in service.

Fire Protection Equipment

Work was awarded to M/s. Mehta & Associates Fire Protection System Pvt. Ltd., Ahmedabad for Rs.44.71 lacs. System is commissioned.

Auxiliary & Station transformers

Manufacturing & supply of 5 nos. transformers (500 KVA 11/0.415 KV) was awarded to M/S Voltas Ltd. Baroda on 21.10.1993 for Rs. 36.95 lacs and all 5 units are received at site erected & commissioned. Manufacturing and supply of 2 Nos. 1000 KVA 11/0.415 KV Station transformers was awarded to M/s. Petson Transformer, Bharuch on 20-10-93 amounting to Rs. 10.87 lacs, both units erected & commissioned.

Lift

LOI was issued to M/s Orbis Elevators Co. Ltd. On 16.6.2006. Lift put into service from 15.2.2008.

Control & protective equipment for CHPH

The order has been placed to M/s. GEC Alsthom on 31.03.2004 amounting to Rs.55.66 lacs .Erection of panel in control room is completed and are commissioned.

Power House and Switchyard lighting

The order has been placed to M/s. OM Suntronics; Baroda on 01.05.1996 for Power House lighting work amounting to Rs.11.75 lacs and to M/s. Oza Mukeshkumar, Visnagar on 24.04.1996 for 220 KV switchyard lighting work amounting to Rs.6.88 lacs.The work is completed.

Air conditioning and ventilation system

The order had been placed to M/s. Air Freeze Co., Baroda on 16.12.1995 for air conditioning and ventilation system work amounting to Rs.21.51 lacs. The Air conditioning and ventilation ducting work including false ceiling work was completed by the firm. The exhaust fans were received and erected. However, as contractor had left the work uncompleted, so the contract was terminated and risk cost tender was invited and the work order issued to M/s. voltas Ltd., on 17.02.2001. Commissioning of ventilation system and Air conditioning system and setting of Air Control Devices completed and are in use.

As per Revised Implementation Schelule (RIS) of June 2002 approved by the SSCAC in its 69th meeting held on 29th July 2003, the commissioning of first unit was targeted by September 2004, with commissioning of other units at an interval of 4 months and the last unit to be commissioned by May 2006.

Unit-I, Unit-II, Unit-III, Unit-IV, Unit-V and Unit-VI of RBPH were commissioned on 01.02.2005, 30.04.2005, 30.08.2005, 13.10.2005, 07.03.2006 and 20.06.2006 respectively.

2.16 CANAL HEAD POWER HOUSE (CHPH)

The CHPH is a surface powerhouse in a saddle dam on right bank at the fringe of the first balancing storage pond with 5 units of 50 MW each deploying Kaplan turbines.

As per the earlier planning, the first Unit was proposed for commissioning by August 1995 followed by other Units at an interval of one month. All works of CHPH were completed in January 1998. All the five Units of CHPH were commissioned and synchronised with grid on 04.10.2004, 16.08.2004, 01.09.2004, 03.09.2004 and 15.12.2004 respectively.

The power is being generated from all the five units of the CHPH. 

2.17 PROGRESS OF CHPH CIVIL WORKS

The status of works of the major components of civil works of CHPH is given in the Table- 2.11.

TABLE 2.11
ITEM-WISE PROGRESS OF CIVIL WORKS OF CHPH

Item of Work

Status of works

Main Civil Works

The contract for civil works of CHPH was awarded to M/s. Jai Prakash Associates on 18.03.1989 for Rs.17.03 Crores. The total revised quantity of concreting for CHPH was129.622Th.cum.The work has already been completed.

Penstocks

The work of fabrication and erection of 5 penstock of CHPH was awarded to M/S IHP Ltd. The total quantity of fabrication and erection is 903 MT, which has been completed. Filling in test is pending for want of required water level in reservoir.

Gates

The work of Gates of CHPH was awarded to M/S Texmaco Ltd. On 07.03.1990 for Rs. 7.51 crores and the fabrication and installation for quantity of about 1500 MT executed against the full quantity of 1530 MT. The work is Completed. Testing at FRL is pending for the want of required water level in reservoir.

Gantry Cranes

This work was awarded to M/S Tungbhadra Steel Product Ltd. (TSPL) for an amount of Rs. 1.30 Crores in July 1996. The work of fabrication and installation of two Gantry Cranes – one for operating penstock stoplogs and another for operating draft tube gates. The contract with TSPL has been scrapped and new agency fixed for the remaining work of both 6OT & 85TCrane. New tender awarded to M/S Arun Construction Co. and J.V.H.T.M.S., Navsari on 24.06.2005. Fabrication and erection work of both 60T and 85T rail is completed.

2.18 PROGRESS OF CHPH ELECTRICAL WORKS

All the works except testing and commissioning of Unit No. 1 to 5 were completed in August 1995, March 1996, August 1996, March 1997 and January 1998 respectively. All the Units have been commissioned and Power is being generated now from this Power House.

The status of works of the major components of electrical works of CHPH is given in the Table- 2.12

TABLE-2.12
PROGRESS OF CHPH ELECTRICAL WORKS

Item of work

Status of works

T.G. Sets Supply

The contract for supply of 5 Units of 50 MW TG sets with its ancillary equipments was awarded to M/s BHEL on 23rd September 1988 for Rs. 61.6 Crore. All the five units are commissioned & synchronized with grid on 04.10.2004, 16.08.2004, 01.09.2004, 03.09.2004 & 15.12.2004 respectively.

T.G. Sets Erection

The work of erection of TG components was awarded to M/s. Prefab Gratings Hyderabad at a contract price of Rs.2.67 crore. The erection and testing of electrical & mechanical parts of T. G. Sets has been completed.

2.19 TRANSMISSION LINES

The work for supply and erection of 400 KV D/C transmission line from Sardar Sarovar Project to Gujarat-Madhya Pradesh and Gujarat-Maharashtra borders is given to Gujarat Electricity Board on turn-key basis and the MOU was signed in February 1991 to complete this work prior to commissioning of TG sets of CHPH. The contract for the work of 220 KV D/C link between CHPH, 220 KV CHPH switchyard and 400 KV RBPH switchyard also has been given to the Gujarat Electricity Board on similar lines. The status of the works of Transmission lines is given in the Table 2.13.

TABLE 2.13

Gujarat

Kasor

Charged on 07.12.2004

Asoj

Charged on 07.12.2004

Maharashtra

Dhule-II

Charged on 07.12.2004

Dhule-I

Charged on 24.3.2006

Madhya Pradesh

Rajgarh -I

Charged on 07.12.2004

Rajgarh -II

Charged on 30.9.2006

2.20 GENERATION OF POWER THROUGH CHPH/RBPH

All the Units of Canal Head Power House (CHPH) & Underground River Bed Power House (RBPH) have since been commissioned. Partial generation of power was possible with the available and regulated supply of water from Indira Sagar Project. 1762.324 million Units of energy were generated during July 2014 to Dec. 2014, out of the total 34824.370 million units generated since August 2004 to Dec. 2014. The combined Power generation status from August 2004 to period ending Dec. 2014 is given in the Table 2.14.

TABLE 2.14

GENERATION OF POWER THROUGH CHPH & RBPH

Sr.No

Month

Year

Total Power Generation

(Million Units)

1                     

August 2004 to December 2004

2004

  128.990

2                     

January 2005 to December 2005

2005

1734.503

3                     

January 2006 to December 2006

2006

3550.312

4                     

January 2007 to December 2007

2007

4245.877

5                     

January 2008 to December 2008

2008

2537.270

6                     

January 2009 to December 2009

2009

2128.142

7                     

January 2010 to December 2010

2010

3599.511

8                     

January 2011 to December 2011

2011

4460.162

9                     

January 2012 to December 2012

2012

3818.803

10                

January 2013 to December 2013

2013

5384.347

11                

January 2014 to December 2014

2014

3236.453

12                

January 2015 to December 2015

2015

2663.230

13                

January 2016

2016

65.384

14                

February 2016

2016

55.112

15                

March 2016

2016

43.826

16                

April 2016

2016

17.087

17                

May 2016

2016

36.971

18                

June 2016

2016

145.779

Sub Total January 2016 to June 2016

364.159

Grand Total

37851.759

(As per information given by EMC, NCA)

2.21 CONSTRUCTION OF GARUDESHWAR WEIR:

The Garudeshwar Weir is located about 12.1 km D/S of Sardar Sarovar Dam. The main purpose is to provide live storage of 34.36 MCM of water to store discharge released by turbines in generation mode. The stored water in Garudeshwar Weir will be utilized during pumping mode operations of River Bed Power House.

In 73rd SSCAC meeting held on 3rd Aug. 2005 approved the estimate and DTP for construction of Garudeshwar Weir amounting to Rs. 288.13 crores. In 101st PSC of SSCAC meeting held on 8th June 2011discussed the revised estimate cost of Rs. 426.13 crores at price level 2010-11.

In 79th SSCAC meeting held on 16.03.2012 has approved the construction of Garudeshwar Weir for estimated cost Rs.438.18 crores and work has been awarded to lowest bidder M/s. Rithwik Projects Private Limited, Hyderabad. SSNNL has issued work order to the agency on 4.5.2012 for Rs. 299,43,36,391.50 (23.0884% below the estimated cost) to complete in 48 months.

SSCAC during the meeting of 104th PSC of SSCAC held on 23.08.2012 has advised SSNNL/GOG to prepare a CPM/CERT chart of important activities for construction of Garudeshwar Weir and submit a monthly progress report showing critical activities.

The construction work of Garudeshwar Weir has been started by the agency from 08.02.2013 and construction of stage-I, cofferdam for block no. 25 to 35 on right bank is completed. Excavation work of right side key block, NOF block No. 35 over flow block no. 28 to 34 is completed and 26 to 28 are in progress.  Excavation for spillway block no. 26 to 33 is in progress.

 

Excavation for left bank side block 1, 2 and NOF block 1 & 2 is under progress and NOF block No. 3 to 5 is in progress. Excavation for overflow block 6, 12, 13 is in progress. Excavation for stilling basin of block 7 to 12 is in progress.

 

Concrete work for the right side key block, NOF block no. 35, over flow block no. 26 to 34 is in progress. Concrete work for the left side bank for key block 1, 2 & NOF block no. 1 to 2 and over flow block no. 7 to 11 is in progress.

 

The progress of work as per monthly report of June 2016 sent by SSNNL is as follows:

 

 

Sr. No.

Particulars

Unit

Total revised Qty.

Progress upto March 2016

Progress during 2016-17

Progress  upto June 2016

% of Progress

1

Excavation

LCM

16.16

06.670

000.468

07.138

44.19%

2

Concreting

LCM

7.63

00.180

000.370

00.550

7.20%

3

Steel

MT

4220

00.000

185.028

185.028

4.38%


 

 

 

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