General information
Organisation
The French Alternative Energies and Atomic Energy Commission (CEA) is a key player in research, development and innovation in four main areas :
• defence and security,
• nuclear energy (fission and fusion),
• technological research for industry,
• fundamental research in the physical sciences and life sciences.
Drawing on its widely acknowledged expertise, and thanks to its 16000 technicians, engineers, researchers and staff, the CEA actively participates in collaborative projects with a large number of academic and industrial partners.
The CEA is established in ten centers spread throughout France
Reference
SL-DES-24-0195
Thesis topic details
Category
Corpuscular physics and outer space
Thesis topics
Monte Carlo simulation of the reactor transfer function to improve neutron noise measurement analyses
Contract
Thèse
Job description
The neutron population in a reactor fluctuates due to the random nature of neutron emission and various sources of mechanical vibrations, which can impact macroscopic neutron cross sections. The reactor can be seen as a system with a transfer function that connects an excitation (such as a vibration or the random nature of neutron emissions from fission) to the neutron population. The study and measurement of this transfer function allow us to deduce essential neutron parameters related to the kinetics of delayed neutron emission or even the source of thge vibrations. However, the theoretical expression of this transfer function is often based on the kinetics of the point reactor, which in some cases does not reliably exploit the measurements.
In this thesis work, we propose to study various extensions of the neutron transfer function formalism using Monte Carlo simulations. First, we will simulate fluctuations using a simplified C++ model to confirm the assumptions of theoretical equations for 'neutron noise' that can be used to 'measure' the effective fraction of delayed neutrons. We will then seek to optimize the positioning of detectors in a reactor and interpret certain effects related to positioning already observed in past experiments conducted by CEA.
University / doctoral school
Ingénierie - Matériaux - Environnement - Energétique - Procédés - Production (IMEP2)
Thesis topic location
Site
Cadarache
Requester
Position start date
01/10/2024
Person to be contacted by the applicant
Truchet Guillaume guillaume.truchet@cea.fr
CEA
DEN/DER/SPRC/LPN
CEA, DEN/DER/SPRC
Centre d’Etudes de CADARACHE
Laboratoire de Projets Nucléaires
Bat 1222 Pièce 13
0442254909
Tutor / Responsible thesis director
JAMMES Christian christian.jammes@cea.fr
CEA
DRF/IRFM/STEP/GEAC
BAT 506 p 231
CEA, Centre de Cadarache
13108 Saint Paul-lès-Durance Cedex
+33 (0)4 4225 3926
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