The lower tier of the internal containment building has been installed at the third new unit being built at the Leningrad nuclear power plant in Russia. The circular structure, with a 44-metre diameter, measuring 10 metres high and weighing 227 tonnes, was installed in a process which took eight hours. The tier had been pre-assembled over recent months on a slipway near its permanent location, which Rosatom said "elimates the need for assembly and welding operations at height". The next stage will be to weld the tier in place. As a result, the complex technological lifting at the 3rd power unit was carried out with high quality."