Research of measuring fast neutron fluence rate low-leakage correction by Ni in NPP irradiation surveillance capsule

Reactors in Nuclear power plant change to low leakage load from nomal load after several cycle operation. The two different load influence neutron fluence rate most and low leakage correction should make while measuring radiation surveillance capsule neutron fluence. The factor was given by calculation at nomal. This paper describes measuring this correction factor use short-life product ⁵⁸Co from Ni monitor which disposal in surveillance capsule, the result comes that measuring correction factor is nearly fit to calculating correction factor. Measuring low leakage correction factor with Ni monitor is available. (authors)