Online edition of India's National Newspaper
Thursday, Jan 31, 2008
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Online edition of India's National Newspaper Thursday, Jan 31, 2008 ePaper | Mobile/PDA Version |
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Tamil Nadu
MAMMOTH EXERCISE: A caisson, weighing about 2900 tonnes, being tugged towards the designated spot at the mouth of the breakwater of the Koodankulam nuclear power project site on Wednesday. KOODANKULAM: The Koodankulam Nuclear Power Project achieved yet another milestone in the construction of the plant on Wednesday with the floating and towing of caisson, a mammoth concrete structure weighing about 2,900 tonnes, which will act as seawater intake pipe. It will be placed in a specially designed bed at the mouth of the breakwater dyke about 1.20 km into the Gulf of Mannar. The caisson is a hallow cellular concrete structure used for allowing smooth intake of water for condenser cooling of the nuclear reactor plant. After being built inside a temporary cofferdam (dry harbour) area near the seashore on a sandbed, the temporary dyke was breached to allow the seawater to enter inside and make the concrete structure float in the sea. Smooth entry of waterThe 5-storey tall concrete structure was then towed by a tug boat into the sea for erection on an already prepared bed at a depth of -10.50 metre at the mouth of the breakwater dyke by ballasting with water. The caissons will provide smooth entry of water at the required depth (-9.50 metre to -4.10 metre). While two passage units of caissons (each weighing about 2,900 tonnes) will have five gates or openings to allow water inside, the adjoining units that supports the passage units will be of 2,400 tonnes. Each gate measures about 6 metre X 5.40 metre through which water will enter inside with required temperature. Chairman, Atomic Energy Commission and Secretary, Department of Atomic Energy, Anil Kakodkar; Chairman and Managing Director, Nuclear Power Corporation of India Limited, Shreyans Kumar Jain; Project Director, KKNPP, K.C. Purohit; Associate Director, KKNPP Expansion Programme, K.S. Rao; and other top officials of the KKNPP witnessed the movement of the heaviest concrete structure, constructed by engineers of NPCIL and its contractor, Hindustan Construction Company. Russian designThe design of the structure was done by Russian firm Gidroproject, Moscow.
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