A nondestructive inspection system for in situ evaluation of an additive manufacturing build part produced by fusing an electrically conductive build material in a sequence of layers at a horizontal build plane by an AM apparatus comprising a build chamber and a build platform configured for supporting the AM build part within the build chamber and for vertical movement to allow sequential lowering of the AM build part to position a surface of a last-produced layer of the AM build part at the build plane for addition of a next-to-be-produced layer thereto, the system comprising: the AM apparatus; a build plane induction coil sensor comprising coplanar magnetization and sensor coils (117, 116), the magnetization coil being configured to induce currents within the build part and the sensor coil being configured to capture impedance data from the build part; an energization circuit in communication with the magnetization coil of the build plane induction coil sensor; and a central processing system in communication with the energization circuit and the build plane induction coil sensor, the central processing system comprising a communication processor configured for sending command signals to the energization circuit and receiving impedance data from the build plane induction coil sensor, an energization controller configured for determining energization commands for transmission to the energization circuit, an induction data analyzer configured for processing the impedance data using complex impedance plane analysis to obtain AM build part impedance characteristics and for identifying anomalies based on differences between the AM build part impedance values and expected impedance characteristics characterised in that: the build plane induction coil sensor being configured and positionable so that during construction of the build part, the magnetization and sensor coils surround at least the last-produced layer of the AM build part in the build plane. the AM apparatus; a build plane induction coil sensor comprising coplanar magnetization and sensor coils (117, 116), the magnetization coil being configured to induce currents within the build part and the sensor coil being configured to capture impedance data from the build part; an energization circuit in communication with the magnetization coil of the build plane induction coil sensor; and a central processing system in communication with the energization circuit and the build plane induction coil sensor, the central processing system comprising a communication processor configured for sending command signals to the energization circuit and receiving impedance data from the build plane induction coil sensor, an energization controller configured for determining energization commands for transmission to the energization circuit, an induction data analyzer configured for processing the impedance data using complex impedance plane analysis to obtain AM build part impedance characteristics and for identifying anomalies based on differences between the AM build part impedance values and expected impedance characteristics characterised in that: the build plane induction coil sensor being configured and positionable so that during construction of the build part, the magnetization and sensor coils surround at least the last-produced layer of the AM build part in the build plane. an energization controller configured for determining energization commands for transmission to the energization circuit, an induction data analyzer configured for processing the impedance data using complex impedance plane analysis to obtain AM build part impedance characteristics and for identifying anomalies based on differences between the AM build part impedance values and expected impedance characteristics characterised in that: the build plane induction coil sensor being configured and positionable so that during construction of the build part, the magnetization and sensor coils surround at least the last-produced layer of the AM build part in the build plane.