Steam Turbine Components Reach Akkuyu

The first heavy component of the steam turbine set – the rotor of the high and intermediate pressure cylinder (HP and IP cylinder), which weighs above 107 tons and is more than 12 meters long – was delivered to the Akkuyu NPP construction site in Turkey, Russian nuclear industrial Rosatom said on April 6.

Akkuyu Steam turbineThe use of a combined HP and IP cylinder is a unique feature of Arabelle steam turbines to be installed at all four Akkuyu NPP power units. Such design enables to achieve the maximum possible turbine hall efficiency factor – up to 38 percent, Rosatom said.

A 38 percent conversion rate is the record high value of the NPP turbine set efficiency factor in the global nuclear power industry. The NPP turbine set represents a high-efficiency rotary thermal engine.

The cylinder rotor is one of the key components of such an engine. The high-pressure steam flow produced by the reactor hall steam generators is supplied to the rotor blades. The potential energy of the compressed and heated water steam causes the rotor to spin and thus is converted to mechanical energy, which is supplied to the turbine generator producing the electric current.

The HP and IP cylinder rotor was manufactured at the GE Steam Power factory (branch of US-based General Electric) in the town of Belfort (France). It took about 16 months to produce the rotor after obtaining approval from the Nuclear Regulatory Authority (NDK). In January 2021, the representatives of the equipment supplier, AAEM LLC (a joint venture of Atomenergomash JSC and GE Steam Power), and AKKUYU NUCLEAR JSC carried out the acceptance of the equipment at the manufacturer's facilities and thus confirmed compliance with the production technologies according to the high-quality standards. After acceptance, the HP and IP cylinder rotor was stored at the factory for 2 months, and was then shipped and delivered by sea to the Akkuyu NPP construction site.

“The list of manufacturers, equipment suppliers, and project participants, in general, includes companies from many countries. Orders for the manufacture of pumping, heat exchange, electrical and other auxiliary equipment have been placed in Hungary, Czech Republic, Italy, Spain, Poland, and Japan,” said Sergei Butсkikh, AKKUYU NUCLEAR JSC First Deputy General Director.

The turbine power can reach 1900 MW, with the welded design of rotors ensuring high corrosion-resistance, Rosatom said. The service life expectancy for the turbines is 60 years.

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