title: Validation of neutron flux redistribution factors in JSI TRIGA reactor due to control rod movements.
abstract: For efficient utilization of research reactors, such as TRIGA Mark II reactor in Ljubljana, it is important to know neutron flux distribution in the reactor as accurately as possible. The focus of this study is on the neutron flux redistributions due to control rod movements. For analyzing neutron flux redistributions, Monte Carlo calculations of fission rate distributions with the JSI TRIGA reactor model at different control rod configurations have been performed. Sensitivity of the detector response due to control rod movement have been studied. Optimal radial and axial positions of the detector have been determined. Measurements of the axial neutron flux distribution using the CEA manufactured fission chambers have been performed. The experiments at different control rod positions were conducted and compared with the MCNP calculations for a fixed detector axial position. In the future, simultaneous on-line measurements with multiple fission chambers will be performed inside the reactor core for a more accurate on-line power monitoring system.
authors.affiliation: Jožef Stefan Institute, Jamova cesta 39, SI-1000 Ljubljana, Slovenia. Electronic address: tanja.kaiba@gmail.com.
authors.forename: Tanja
authors.initials: T
authors.lastname: Kaiba
authors.affiliation: Jožef Stefan Institute, Jamova cesta 39, SI-1000 Ljubljana, Slovenia. Electronic address: gasper.zerovnik@ijs.si.
authors.forename: Gašper
authors.initials: G
authors.lastname: Žerovnik
authors.affiliation: Jožef Stefan Institute, Jamova cesta 39, SI-1000 Ljubljana, Slovenia. Electronic address: anze.jazbec@ijs.si.
authors.forename: Anže
authors.initials: A
authors.lastname: Jazbec
authors.affiliation: Jožef Stefan Institute, Jamova cesta 39, SI-1000 Ljubljana, Slovenia. Electronic address: ziga.stancar@ijs.si.
authors.forename: Žiga
authors.initials: Ž
authors.lastname: Štancar
authors.affiliation: CEA, DEN, DER, Instrumentation, Sensors and Dosimetry Laboratory, Cadarache, F-13108 St-Paul-Lez-Durance, France. Electronic address: loic.barbot@cea.fr.
authors.forename: Loïc
authors.initials: L
authors.lastname: Barbot
authors.affiliation: CEA, DEN, DER, Instrumentation, Sensors and Dosimetry Laboratory, Cadarache, F-13108 St-Paul-Lez-Durance, France. Electronic address: damien.fourmentel@cea.fr.
authors.forename: Damien
authors.initials: D
authors.lastname: Fourmentel
authors.affiliation: Jožef Stefan Institute, Jamova cesta 39, SI-1000 Ljubljana, Slovenia. Electronic address: luka.snoj@ijs.si.
authors.forename: Luka
authors.initials: L
authors.lastname: Snoj
keywords: Control rod movement; Fission chamber; MCNP; Neutron flux redistribution factors; Research reactor; TRIGA