The KNK/KNU 50 neutron ionization chambers are designed for neutron flux monitoring in ex-core positions. The neutron sensitivity of these ionization chambers is achieved by the coating of one electrode with enriched boron-10. Thermal neutrons react with the isotope boron-10 emitting alpha particles, which produces ionization in the gas within the detector. Their discharge on the electrodes causes charge pulses. These charge pulses are integrated to a DC current, which can be measured in the external circuit.