Abstract
This paper presents a development of special diamond detector for time dependent neutron flux measurements in a nuclear reactor. Neutron flux changes during SCRAM are difficult to measure by existing detector technologies. Therefore, a new detector is developed. This new type diamond based detector should allow to perform fast measurements of neutron flux during SCRAM with high pulse count rate. The diamond detector design and signal processing are described in this paper including the pulse shape discrimination method. In addition to theoretical detector study, three detector was manufactured at CEA Saclay. Experience gathered during manufacturing is described as well.
Highlights
Reactor operation is connected with events that have direct impact on reactor operation and reactor nuclear safety
To demonstrate capabilities requested from the new detector, the following example is presented: One case of fast transient measurement application is a study of the neutron flux changes during the fast control rod insertion (SCRAM)
This paper presents the progress in the diamond detector development, aimed to the fast neutron flux change measurements in a nuclear reactor introduced by the SCRAM
Summary
Reactor operation is connected with events that have direct impact on reactor operation and reactor nuclear safety. One area of PIE contains fast changes of reactivity (like RIA1 or SCRAM2) Those events initiate a fast transient process, where the neutron flux distribution and parameters are rapidly changed. Deep and clear understanding of the SCRAM fast transient processes are highly challenging due to several reasons They are complex, space dependent and mostly, they happen very fast. The currently available experimental instrumentation should be improved (new, faster detectors and detecting systems) which will result in better reactor core monitoring, faster, and more accurate prediction of core behavior. This improvement in the field of fast transient experiments will conclude in enhancement of codes assigned for fast transient studies
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