Gastight case around a reactor and the circuit and
auxiliary systems so that - even after an incident - no radioactive
substances may escape into the atmosphere and environment. The containment
is one of the barriers in a nuclear power plant that make it difficult
for radioactive substances to escape into the environment. It surrounds
the nuclear part of the plant and is designed so that in case of serious
malfunctions it collects the exiting steam without failing itself. The
containment of a pressurized water reactor is e.g. a steel ball with
a diameter of approx. 50 m and a wall thickness of 30 mm. It includes
rapidly closing valves in the pipings leading out of the containment
and personal and material locks. The case is enclosed by an up to 2
m thick reinforced concrete dome to protect against external impacts.
The inner wall of the dome is lined with a gas-tight steel skin. Negative
pressure exists in the annular gap between containment and steel skin.
The radioactive substances exiting the containment during normal operation
enter the negative pressure zone and reach the vent stack via filters.
During an incident, the air from the negative pressure zone is pumped
back into the containment.
11 - 15 March 2018
30 September - 04 October 2018
Prague, Czech Republic