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Primary Circuit of Akkuyu NPP Unit 1 Reactor Plant Pass Pre-Commissioning Strength Test Akkuyu Nuclear, PUBLISHED 11.10.2026 Hydraulic strength tests of the primary circuit of reactor plant have been conducted at Akkuyu NPP Unit 1 (being built by Rosatom State Corporation). During the operation, the primary circuit pressure was raised to 24.5 MPa, a level that is approximately 1.5 times as high as the operating pressure of the reactor plant. For comparison, a comparable pressure in the natural environment is created in the ocean at a depth of about 2.4 kilometers. The primary circuit water temperature at the initial stage of the operation was as high as 135°C, i.e. 35 degrees higher than the water boiling point at the atmospheric pressure the human is accustomed to. In order to conduct the hydraulic tests, the primary circuit was filled with the chemically demineralized water, and then the required pressure and temperature were created inside it using reactor coolant pump sets. During the tests, the operating personnel of the power unit were monitoring the condition of equipment and pipelines in the main control room (MCR) by readings of a process instrumentation and control system (Process I&C). “In the course of construction, thousands of extremely complicated engineering operations have been completed at Akkuyu NPP Power Unit 1. We are currently at the stage where the results of this giant work are undergoing a comprehensive verification. Safe operation of the entire power unit depends on the reliability of the primary circuit. Exceptionally high process requirements apply to equipment, pipelines and welded joints there. The hydraulic tests have been successfully completed. This is conclusive evidence of the quality of installation, welding and adjustment works, and another step towards the first criticality of the power unit," Rosatom State Corporation Director General Alexey Likhachev said. Following the results of the hydraulic tests, the criteria stipulated in the design of reactor plant VVER-1200, have been met. About the primary circuit of reactor plant with type VVER-1200 reactors The primary circuit of reactor plant includes a reactor, reactor coolant pumps, steam generators, a pressurizer and a reactor coolant pipeline that connects them. At the operation stage of a power unit, the coolant, which is a demineralized water with a temperature of up to 330°С and under a pressure of about 16 MPa that heats the secondary circuit water in the steam generators, is circulated through the primary circuit. About Akkuyu NPP Akkuyu NPP is the first nuclear power plant under construction in the Republic of Turkiye. The Akkuyu NPP project consists of four power units with Russian-designed VVER generation 3+ reactors. The capacity of each power unit will be 1,200 MW. Akkuyu NPP construction is the first project in the global nuclear industry implemented on the basis of the Build-Own-Operate business model. Russia is developing cooperation with all interested countries. The implementation of major international projects continues. Rosatom and its divisions are actively involved in this work. Topics: Commissioning, Asia, Turkey, NPP Akkuyu Other news: Welding of Primary Coolant Piping Completed at Akkuyu-2 The welding was completed in 73 days. Construction of first NPP in Uzbekistan is launched Ceremony marked pouring of first concrete. Rosatom Enters Indian Market of Additive Manufacturing RusBeam 2800 industrial 3D printer has successfully supplied. |
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