"Anytime we can eliminate a cable it helps with safety and flexibility, " says Pasley.

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The AP1000 has half the valves, 35% fewer safety-grade pumps, 80% less pipe and 85% less cable than existing plants.

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Lib Dem Business Secretary Vince Cable said blacklisting as a practice was "thoroughly objectionable and indefensible", while the health and safety issues in the construction sector were extremely important.

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Besides clean-up of materials, the company plans to remove unused utilities in the shaft, repair any damaged structures, install a water ring to control entry of water into the shaft and prevent ice from forming in winter, install a new power cable and a metal brattice between the eastern and western half of the shafts to provide a physical barrier, improving safety and functionality, company officials said.

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