kriittisyystilanne

A kriittisyystilanne, or criticality situation, refers to a state where a critical system is operating close to its limits or experiencing a significant deviation from its normal functioning. This term is often used in contexts involving nuclear reactors, but can be applied to any complex system where a failure could have severe consequences. In nuclear power, a kriittisyystilanne specifically relates to the control of nuclear fission. It describes a condition where the chain reaction is not adequately controlled, potentially leading to an uncontrolled increase in power output or an undesirable state of reactivity.

The primary goal in managing such situations is to maintain the reactor in a safe and stable state. This involves careful monitoring of neutron flux, temperature, and pressure. Operators use control rods and other mechanisms to absorb neutrons and regulate the rate of fission. Exceeding predefined safety margins or experiencing unexpected changes in system parameters can trigger a kriittisyystilanne. Early detection and swift, appropriate actions are crucial to prevent escalation and ensure safety. The precise definition and management protocols for kriittisyystilanne are detailed in the operational procedures and safety analyses of each specific critical system.