OREANDA-NEWS. Power unit 4 of the Leningrad NPP was shut down for scheduled preventive maintenance on April 20, according to the previously filed and confirmed application.

The preventive maintenance of power unit 4 of the Leningrad NPP involved a subsidiary of the Holding – OJSC MSU-90. As part of the repair campaign of this year, the company's installers repaired and prepared the following equipment for operational control:

• base metal and welded joints of emergency reactor cooling security system;

• base metal and welded joints of release and pressure pipelines;

• base metal and welded joints of purging safety systems and reactor shutdown cooling;

• base metal and welded joints of pipelines DU 300;

• intermediate repairs of superheater separator;

• overhaul of technological capacitors;

• overhaul of deaerators;

• installation of overhead rings in the points of welding of input and output nozzles for processing medium of alluvial pearlite and ion exchange filters;

Deputy General Director of OJSC MSU-90 Alexander Bomk: “In the course of routine maintenance we performed diagnostics, repair and maintenance work on the main equipment of the reactor and turbine units, as well as of the power unit's security systems. In the course of this work the original specifications are restored and the equipment is further upgraded”.

Holding TITAN-2 is the largest group of companies in the North-West Region, working in the construction of the most significant facilities for the nuclear power plants and power supply industry. Its organisations provide a full cycle of construction operations – from design of project documentation to delivery and commissioning. Exceptional work is ensured by over 4,000 highly qualified staff specialists across nearly 20 organisations with more than 40 years of experience in the construction of unique and especially complex facilities.

Leningrad NPP is a subsidiary of OJSC Concern Rosenergoatom. The power plant is located in the town of Sosnovy Bor on the southern shore of the Gulf of Finland, 80 kilometres west of St. Petersburg. LNPP is the first power plant in Russia to operate RBMK-1000 reactors (light-water-cooled graphite-moderated reactors, LWGR). The first power unit was started up in 1973, the second in 1975, the third in 1979, the fourth in 1981. The operation of all power units was extended until 2018, 2020, 2025 and 2026 respectively, after their modernisation. As soon as these deadlines are met the power units of LNPP will be gradually decommissioned.