method for measuring a relative size of the burn off of a pebble bed htr fuel elements (htr) and appropriate device

摘要

A process for measuring the burn-up of a nuclear fuel element involves removing the fuel element (6) from the reactor, and placing it in a measurement position (12). The element is then exposed to a neutron flux (2). A detector is used to determine the quantity of high energy gamma radiation above 1MeV.