Speaker
Description
The core instrumentation of the EPR reactors consist of 12 exchangeable instrumentations, each with 6 fixed cobalt-self-powered neutron detectors and 3 type k thermocouples for core exit temperature, 40 measuring fingers of the aeroball measuring system using moveable steel ball stacks with vanadium as probes, as well as 4 level and dome temperature measurement probes. The exchangeable instrumentation and the aeroball fingers are installed in 12 instrumentation lances guided through the reactor pressure vessel head.
The poster explains the purpose, concept and operation of the instrumentation:
The aeroball measuring system, as reference system providing 3D core flux maps, allows calibration of the fixed in-core cobalt self-powered neutron detectors, which provide continuous input to the reactor protection system. The core exit temperature system is used for accidental monitoring and also for level measurement, which is based on a heat transfer principle. Material selection and manufacturing of the instrumentation with its welding and brazing steps are shown as examples. The components of the instrumentation are shown with dimensions and weights. As results, examples of radial and axial profiles of neutron flux measurements in the EPR reactor with this instrumentation are shown.
