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CALCULATION METHODOLOGY ASSESSMENT TO DETECTLOCALISED PERTURBATION IN SODIUM-COOLED FAST REACTORWITH EX-CORE INSTRUMENTATION
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics. (Fission Diagnostics and Safeguards)
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics. (Fission Diagnostics and Safeguards)
(CEA, DEN, DER, Instrumentation Sensors and Dosimetry Laboratory, Cadarache)
(CEA, DEN, DER, Instrumentation Sensors and Dosimetry Laboratory, Cadarache)
2016 (English)In: CALCULATION METHODOLOGY ASSESSMENT TO DETECTLOCALISED PERTURBATION IN SODIUM-COOLED FAST REACTORWITH EX-CORE INSTRUMENTATION, 2016Conference paper (Refereed)
Abstract [en]

Safety and reliability are essential requirements for development and operation of SodiumcooledFast Reactors. Development of a neutron flux monitoring system (NFMS) for the FrenchSFR is one of the key R&D areas identified. Diverse possibilities of detector system installationshould be studied for different locations in the reactor vessel in order to detect any perturbations inthe core. In this paper, we aim to explore two calculation routes available for neutron flux monitoring,assess them for their efficiency to detect fission rate variation at Above-core structure (ACS)location and discuss the associated pros and cons. The two calculational approaches we refer hereare criticality mode and external source mode. We discuss the feasibility of choosing this locationfor detecting in-core perturbations and evaluate the methodology needed to achieve it. The paperfocuses on the difficulties associated with neutron detection when the detectors are located at far-offdistances from the source. We found that for a difficult case such as ours where the detectors arelocated far-away from the source, criticality mode doesn’t work. Variance reduction techniques,employed in the external source mode are indispensable to drive neutrons to areas of interest.

Place, publisher, year, edition, pages
2016.
Keyword [en]
Sodium Cooled Fast reactors, Fission chambers, Instrumentation, Variance reduction
National Category
Subatomic Physics
Research subject
Physics with specialization in Applied Nuclear Physics
Identifiers
URN: urn:nbn:se:uu:diva-297045OAI: oai:DiVA.org:uu-297045DiVA: diva2:940606
Conference
PHYSOR 2016
Funder
Swedish Research Council, B0774801
Available from: 2016-06-21 Created: 2016-06-21 Last updated: 2016-06-21

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