抄録
The first nuclear power station in Japan (Advanced Calder Hall type, 166 MW electric) is now under construction at Tokaimura.
Construction of several new nuclear power stations will begin within a few years and also building project of the first nuclear powered ship (6500 G.T.) has been started in 1963.
Al-killed steel plates 8094 mm thick were manually welded for Tokai reactor pressure vessel and its steam raising units were constructed with 5474 mm thick boiler plates using both submerged arc and manual welding. JPDR is a small BWR (12.5 MW electric), and the inner surface of its pressure vessel was stainless steel cladded by submerged arc process.
Researches on the welding of the nuclear reactor have been extensively carried out by Japan Welding Engineering Society and also each industrial plant is doing its own researches. The study on the effect of irradiation on the properties of materials has been just started.
