A method, arrangement and computer program is described for determining a set of standardized rod types for use in a nuclear reactor core. The method includes transmitting first information based on a first resource index through a first antenna and transmitting second information based on a second resource index through a second antenna. These may include forcing specific computers to update their malware definition data, forcing particular computers to change their security settings and isolating individual portions of the computer network. A deflector is provided for covering the slots and the deflector is displaceable with the knife elements to uncover the slots as the knife elements are displaced through the slots and into the passageway. Antennas receive RF interrogation signal from a nearby interrogatortransceiver and send reflected RF signals back to the interrogator unit containing sensor measurement and sensor ID. The coil springs are tuned to define a predetermined force at which the heat sink is pushed against the integrated circuit.