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2. Issues
2.1 Quantities to calculate
2.1.1 Reactivity and its evolution
In normal operation, core reactivity is zero at all times, since the reactor is just critical (k eff = 1). This reactivity results from the balance between the fuel's potential reactivity, which diminishes as the fuel wears out (through consumption of fissile nuclei), and the anti-reactivity provided by the various neutron absorbers present in the core (generated fission products, soluble boron in the PWR...
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Bibliography
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Code DRAGON http://www.polymtl.ca/nucleaire/DRAGON/
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