Sequential detection of a total instantaneous blockage occurred in a single subassembly of a sodium-cooled fast reactor

Abstract
The on-line diagnosis can be defined as a sequence of operations designed to detect, to isolate an anomaly and to mitigate its impact before it affects the inspected system. In the context of the project ALPES 2 (local accidents – protection and monitoring, in English) of the GIS 3SGS (group of scientific interest – surveillance, dependability, security of large systems, in English), the statistical methods for the early detection of a Total Instantaneous Blockage (TIB) occurred in a single subassembly of a sodium-cooled fast reactor have being studied. This work is carried out within the framework of model-based detection methods. The goal of this paper is to study the feasibility of a sequential approach to detect an abnormal local temperature rise of neighboring subassemblies due to a TIB while respecting the probability of missed detection, the probability of false alarm and the required time-to-alert. The adaptive statistical estimation/detection method is based on the measurements taken from ThermoCouples (TCs) located above the subassemblies. The aim is therefore to provide a complementary tool to improve the early detection of a TIB in the context of nuclear safety.

Citation
Nikiforov, I., Harrou, F., Cogranne, R., Beauseroy, P., Grall, E., Guépié, B. K., … Jeannot, J.-P. (2020). Sequential detection of a total instantaneous blockage occurred in a single subassembly of a sodium-cooled fast reactor. Nuclear Engineering and Design, 366, 110733. doi:10.1016/j.nucengdes.2020.110733

Acknowledgements
The authors gratefully acknowledge the research and financial support of this work from the Commissariat à l'Energie Atomique et aux Energies Alternatives (CEA), from the group of scientific interest GIS 3SGS, and from the project AAP NEEDS of CNRS, France.

Publisher
Elsevier BV

Journal
NUCLEAR ENGINEERING AND DESIGN

DOI
10.1016/j.nucengdes.2020.110733

Additional Links
https://linkinghub.elsevier.com/retrieve/pii/S0029549320302272https://hal.science/hal-02906760/file/S0029549320302272.pdf

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