Containment building

Reactor Unit 3 (right) and Unit 4 (left) of Fukushima Daiichi on 16 March 2011. Three of the reactors overheated, causing meltdowns which released large amounts of radioactive material into the air.[1]

Cross-section sketch of a typical BWR Mark I containment. DW = drywell, WW = wetwell, SF = spent fuel area

NRC image of Containment area inside a Containment building.

A containment building, in its most common usage, is a reinforced steel or lead structure enclosing a nuclear reactor. It is designed, in any emergency, to contain the escape of radioactive steam or gas to a maximum pressure in the range of 40 to 80 psi ( 410 to 1400 kPa). The containment is the fourth and final barrier to radioactive release (part of a nuclear reactor's defence in depth strategy), the first being the fuel ceramic itself, the second being the metal fuel cladding tubes, the third being the reactor vessel and coolant system.

单词	Primary containment
释义	Primary containment 英语百科 Containment building A containment building, in its most common usage, is a reinforced steel or lead structure enclosing a nuclear reactor. It is designed, in any emergency, to contain the escape of radioactive steam or gas to a maximum pressure in the range of 40 to 80 psi ( 410 to 1400 kPa). The containment is the fourth and final barrier to radioactive release (part of a nuclear reactor's defence in depth strategy), the first being the fuel ceramic itself, the second being the metal fuel cladding tubes, the third being the reactor vessel and coolant system.
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Primary containment

Containment building