[en] LANCER II is new INETEC lightweight mobile robot for Reactor Pressure Vessel inspection. Contrary to heavy equipment that is usually used for the inspection of Reactor Pressure Vessel, this light and mobile robot is able to move and navigate throughout the vessel bringing the probes on certain locations. Due to lightweight only refueling bridge, instead of polar crane, is needed for installation and de-installation procedure. Reactor pressure vessel inspection is one of the most important and most extensive examination. The inspection demands high standards related to the technology and quality, and continuous innovation in the field of NDT. LANCER II, multi-axis robotic system is capable to provide inspection of all welds in reactor pressure vessel including shell welds, nozzle, bottom mounted instrumentation and baffle to former bolts. After installation at arbitrary location, LANCER II positions itself using fixed markers at the edge of reactor vessel as a part of calibration process. Once calibrated, it can move at any location in the vessel. Equipped with thrusters and vacuum suctions LANCER II can swim in the water or crawl like a spider along the vessel shell. At the same time, neutral buoyancy helps him to easily move in any direction. During inspection, eddy current method is applied for clad surface examinations; visual inspection is used for examination of the vessel inner surface and phased array ultrasonic technique for base material examination. Compact, highly automated system such as LANCER II, significantly reduces the inspection time, radiation exposure to examination personnel, shortening nuclear power plant outage and cutting the total inspection costs