Method for measuring the relative amount of burnup of fuel elements of a pebble bed type high temperature reactor (HTR) and apparatus suitable for the method

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.