FIELD: nondestructive inspection of fissionable materials in irradiated nuclear fuel of nuclear reactor fuel assemblies.
SUBSTANCE: proposed method includes additional measurements integrated gamma-radiation in fuel assembly of geometry close to that used in recording inherent neutron radiation. Then ratio of neutron count rate (NCR) found from fuel assembly inherent neutron radiation detectors to exposure dose rate (EDR)obtained from integrated gamma-radiation detectors (NCR/EDR) is evaluated, this ratio is used to identify fuel assembly; amount of fissionable material in fuel assembly is determined by inherent neutron radiation.
EFFECT: enhanced reliability of irradiated nuclear fuel inspection with respect to inherent neutron radiation, enlarged functional capabilities due to pre-identification of fuel assembly.
1 cl, 1 dwg
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