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Article | REF: BN3070 V1

Methods for core neutronics calculation

Authors: Christine POINOT-SALANON, Anne NICOLAS, Michel SOLDEVILA

Publication date: July 10, 2013

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2. Issues

2.1 Quantities to calculate

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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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