Thick-walled cylindrical steel vessel enclosing the System used to initiate, maintain and control a fission chai... Part of the nuclear reactor where the fission chain reaction... in a Thermal power plant, primarily used for electricity generati.... The vessel is made of special fine-grained low alloy ferritic steel, well suited for welding and with a high toughness while showing low porosity under Uncharged elementary particle with a mass of 1.67492716 ·10... irradiation. The inside is lined with austenitic steel Tightly bound (usually metallic) casing directly surrounding... to protect against corrosion. For a 1,300 Megawatt electric; electric output of a power plant in megaw... Power reactor in which the heat is dissipated from the core ..., the Thick-walled cylindrical steel vessel enclosing the reactor ... is about 12 m high, the inner diameter is 5 m, and the wall of the cylindrical shell is about 250 mm thick. The overall weight amounts to approx. 530 t without internals. The vessel is designed for a pressure of 17.5 MPa (175 bar) and a temperature of 350 °C.