A detection apparatus usable with a fuel rod from among a plurality of fuel rods of a fuel assembly, the fuel rod having a cladding that has an interior region, the fuel rod being situated within a nuclear reactor, the detection apparatus being cooperable with an electronic processing apparatus situated outside of the nuclear reactor, the detection apparatus characterized by: a transmitter positioned outside the cladding and inside the nuclear reactor in the vicinity of the fuel rod, the transmitter being structured to generate an excitation pulse in the form of a first magnetic field signal and to wirelessly transmit the excitation pulse, the excitation pulse being structured to travel wirelessly through the cladding and into the interior region; an electrical circuit apparatus having a resonant electrical circuit supported within the interior region, the resonant electrical circuit being structured to generate a response pulse in the form of a second magnetic field signal in response to the excitation pulse and to wirelessly transmit the response pulse, the response pulse being structured to travel wirelessly from the interior region and through the cladding; the resonant electrical circuit comprising a plurality of circuit components (54, 56), at least one circuit component of the plurality of circuit components (54, 56) having a property which is structured to vary in response to a condition of the fuel rod and which, responsive to a change in the condition, is structured to cause the property and the response pulse to vary with the change in the condition and to be indicative of the condition; and a receiver supported within the nuclear reactor outside the cladding and in the vicinity of the fuel rod, the receiver being structured to receive the response pulse and to communicate to the electronic processing apparatus an output responsive to the received response pulse. a transmitter positioned outside the cladding and inside the nuclear reactor in the vicinity of the fuel rod, the transmitter being structured to generate an excitation pulse in the form of a first magnetic field signal and to wirelessly transmit the excitation pulse, the excitation pulse being structured to travel wirelessly through the cladding and into the interior region; an electrical circuit apparatus having a resonant electrical circuit supported within the interior region, the resonant electrical circuit being structured to generate a response pulse in the form of a second magnetic field signal in response to the excitation pulse and to wirelessly transmit the response pulse, the response pulse being structured to travel wirelessly from the interior region and through the cladding; the resonant electrical circuit comprising a plurality of circuit components (54, 56), at least one circuit component of the plurality of circuit components (54, 56) having a property which is structured to vary in response to a condition of the fuel rod and which, responsive to a change in the condition, is structured to cause the property and the response pulse to vary with the change in the condition and to be indicative of the condition; and a receiver supported within the nuclear reactor outside the cladding and in the vicinity of the fuel rod, the receiver being structured to receive the response pulse and to communicate to the electronic processing apparatus an output responsive to the received response pulse.