Petrozavodsk Branch of AEM-Technologies, JSC (a member of Atomenergomash, machine engineering division of Rosatom Corporation, and Karelian Regional Branch of the Russian Engineering Union) has started hydraulic tests of half bodies of passive core flooding system (PCFS) hydroaccumulators. The items are intended for Power Unit No. 2 of Rooppur NPP (People’s Republic of Bangladesh).
Hydraulic test is one of the most important final inspection of the equipment. PCFS is filled with specially treated thermally enriched water according to the hydraulic tests program. The pressure in the vessel is raised up to 4.4 MPa and held for 10 min minimum. After the pressure is released, the outer surface is inspected visually, leaks and permanent deformations are checked.
Eight PCFS hydroaccumulators are to be installed per one unit. Hydroaccumulators having a capacity of 120 cubic metres each are manufactured from stainless steel. The item comprises three shells and two heads. Ladders and maintenance platforms as well as other internals are installed into the body.
PCFS refers to the second level of NPP passive safety systems. It is intended for removal of the coolant residual heat of the reactor primary circuit. An aqueous boric acid solution heated to a temperature of approximately 60 degrees is stored inside the hydroaccumulators during operation at the plant. When the pressure in the primary circuit falls below a certain level, the fluid is automatically fed into the reactor and the active core is cooled down.
Rooppur NPP is being designed and built from a Russian design. Design and construction of the object is carried out by the Engineering Division of the Rosatom State Corporation. The power plant will consist of two units with VVER reactors having the service life of 60 years with possible prolongation for 20 more years. The capacity of each unit will be 1200 MW. AEM-Technologies, JSC produces main reactor room equipment for two units of the power plant.

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AEM-Technologies, Joint-Stock Company established 2007 within Atomenergomash, JSC  –  the machine-building subdivision of Rosatom State Corporation – is nowadays one of the leading Russian companies in the field of power machine-building. The company consists of an engineering center staffed with experienced designers and process engineers, as well as two manufacturing sites: Petrozavodskmash, AEM-Technologies, JSC Branch in Petrozavodsk, and Atommash, AEM-Technologies, JSC Branch in Volgodonsk.
Source: Communication Department