사용후핵연료 연소도 측정을 위한 3He 검출기의 중성자 계측 효율 연구
A Study on the Neutron Detection Efficiency of 3He Detector for Measuring the Burnup Profile of Spent Nuclear Fuel
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Accurate burnup assessment of spent nuclear fuel (SNF) is critical for nuclear material accountancyand non-proliferation measures. This study focuses on establishing the neutron detection efficiency of a 3He detectionsystem, a key tool for the non-destructive assay of SNF. Experiments were conducted using a 252Cf standard neutronsource in a water tank, complemented by detailed MCNP(Monte Carlo N-Particle) simulations that replicated theexperimental geometry. The measured detection rates showed good agreement and consistent proportionality withthe MCNP-calculated reaction rates across various source–detector distances. Based on this comparative analysis, thedetection efficiency of the 3He system was estimated to be approximately 60%. The established detection efficiencyimproves the reliability of the neutron measurement system and significantly contributes to the characterization andsafety verification required for the dry-storage transfer of domestic SNF.
Abstract
Accurate burnup assessment of spent nuclear fuel (SNF) is critical for nuclear material accountancyand non-proliferation measures. This study focuses on establishing the neutron detection efficiency of a 3He detectionsystem, a key tool for the non-destructive assay of SNF. Experiments were conducted using a 252Cf standard neutronsource in a water tank, complemented by detailed MCNP(Monte Carlo N-Particle) simulations that replicated theexperimental geometry. The measured detection rates showed good agreement and consistent proportionality withthe MCNP-calculated reaction rates across various source–detector distances. Based on this comparative analysis, thedetection efficiency of the 3He system was estimated to be approximately 60%. The established detection efficiencyimproves the reliability of the neutron measurement system and significantly contributes to the characterization andsafety verification required for the dry-storage transfer of domestic SNF.