Pressurized nuclear plant ¹⁰B abundance evolution study

Highlights: • The evolution equation of ¹⁰B abundance is deduced and verified by measurement. • The equation is simplified by Taylor expansion without losing accuracy. • The deviation between theoretical and measured boron concentration is well fixed. • Useful measured data of ¹⁰B abundance in some major systems is listed in detail. - Abstract: The boron concentration deviation between measurement and prediction in Pressurized Water Reactor (PWR) is mainly caused by the decrease of ¹⁰B abundance. The evolution equation of ¹⁰B abundance during the cycle is deduced according to theoretical calculation and also verified by measurement at different burn-up. The deviation between theoretical and measured boron concentration that frequently happened at long-cycle fuel reload management can be fixed with the equation.