Physics:Criticality (status)
In the operation of a nuclear reactor, criticality is the state in which a nuclear chain reaction is self-sustaining—that is, when reactivity is zero. In supercritical states, reactivity is greater than zero.[1]
Applications
Criticality is the normal operating condition of a nuclear reactor, in which nuclear fuel sustains a fission chain reaction. A reactor achieves criticality (and is said to be critical) when each fission releases a sufficient number of neutrons to sustain an ongoing series of nuclear reactions.[2]
The International Atomic Energy Agency defines the first criticality date as the date when the reactor is made critical for the first time.[3] This is an important milestone in the construction and commissioning of a nuclear power plant.
See also
References
- ↑ "Criticality". IAEA Safety Glossary. International Atomic Energy Agency. 2007. pp. 46. http://www-pub.iaea.org/MTCD/publications/PDF/Pub1290_web.pdf. Retrieved 17 February 2014.
- ↑ "Criticality". Glossary. US Nuclear Regulatory Commission. 11 December 2013. https://www.nrc.gov/reading-rm/basic-ref/glossary/criticality.html. Retrieved 17 February 2014.
- ↑ "First Criticality Date". Glossary. International Atomic Energy Agency. http://www.iaea.org/PRIS/Glossary.aspx. Retrieved 17 February 2014.
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