Petrozavodsk Branch of JSC “AEM-technology” (a member of Atomenergomash, machine engineering division of Rosatom Corporation, and Karelian Regional Branch of the Russian Engineering Union) has launched manufacture of pipes of the main coolant pipeline (MCP) for Kudankulam NPP (India), Unit 5. An anticorrosive layer is being applied to the internal surface of pipe blanks by electroslag cladding.
In total, 33 pipes as well as sets of rings for welding procedure qualification and qualification of welders during the erection, will be cladded for Unit 5 of Kudankulam NPP. The main coolant pipeline which inner diameter is 850 mm and total length is 146 m, connects the main equipment of the NPP primary circuit – reactor, steam generators and reactor coolant pumps.
The NPP MCP is intended for circulation of the primary circuit coolant at a temperature of up to 330 degrees Celsius under a high pressure of 160 atmospheres. An anticorrosive coating is applied to the internal surface of forged blanks to protect the pipeline from the coolant corrosive attack. It is worth reminding that Petrozavodskmash is the first plant in Russia that has mastered the procedure of manufacturing seamless clad pipes for nuclear power plants.
Earlier Petrozavodskmash successfully manufactured and shipped such equipment for Units 3&4 of Kudankulam NPP, and later on it will manufacture the MCP for Unit 6 of the mentioned power plant.
Kudankulam NPP is a nuclear power plant with VVER-1000 reactors which is located in the south of India in Tamil Nadu state. The first Kudankulam unit was brought to the minimum controlled power level (MCPL) on the 13th of July, 2013. In October 2013 it was connected to the power supply grid of India, and in June 2014 it was brought to 100% of its capacity. The second unit was brought to the MCPL on the 10th of July, 2016. On August 29, 2016 it was connected to the power supply grid of India, and in January 2017 it was brought to 100% of its capacity. The General Framework Contract with Rosatom on construction of the 3rd and the 4th units was signed in spring 2014. The Engineering Division of Rosatom State Corporation and the Nuclear Power Corporation of India signed an agreement on the third stage construction (Units 5&6) of Kudankulam NPP.
Joint Stock Company “AEM-technology” established in the year 2007 within the structure of JSC “Atomenergomash”, machine engineering division of Rosatom State Corporation, is presently one of the leading Russian companies in the field of power engineering. The company’s structure includes an engineering centre staffed with experienced design and process engineers as well as two manufacturing sites, Petrozavodskmash Branch of JSC “AEM-technology” in Petrozavodsk and Atommash Branch of JSC “AEM-technology” in Volgodonsk.