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The development of digital neutron flux monitoring platform for China initiative accelerator driven subcritical system.

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Title: The development of digital neutron flux monitoring platform for China initiative accelerator driven subcritical system.
Authors: Yao, Lei1,2,3,4 (AUTHOR), Jiang, Jun5 (AUTHOR), Yin, Yu-Hao5 (AUTHOR), Li, Jin-Yang1,2,3 (AUTHOR) lijinyang@lzu.edu.cn, Shao, Jian-Xiong1,2,3 (AUTHOR) shaojx@lzu.edu.cn
Source: Progress in Nuclear Energy. Jul2026, Vol. 197, pN.PAG-N.PAG. 1p.
Subjects: Neutron flux, Accelerator-driven systems, Monte Carlo method, Visualization, Tikhonov regularization
Geographic Terms: China
Abstract: The China initiative Accelerator Driven subcritical System (CiADS), scheduled for commissioning in 2029, demands precise neutron flux monitoring to ensure operational safety and stability of its coupled nuclear system, requiring high reliability and minimal fault tolerance. Real-time monitoring of core neutron flux is critical to mitigate risks from dynamic flux variations driven by an external neutron source via spallation reactions, ensuring optimal power control and system integrity. The compact CiADS core structure and lead-bismuth eutectic coolant environment pose significant challenges for in-core detector deployment due to material degradation under irradiation and spatial constraints, necessitating reliance on ex-core neutron detectors strategically positioned within the facility. To address these challenges, a sophisticated digital neutron flux monitoring platform with advanced online visualization has been developed to continuously reconstruct the core flux distribution in the subcritical reactor. A comprehensive response matrix database, constructed using the Monte Carlo method across diverse operating conditions, enhances reconstruction accuracy. Tikhonov regularization stabilizes the response matrix, minimizing computational uncertainties. The platform's online visualization interface delivers real-time, interactive 3D rendering of core power distribution, featuring dynamic heatmaps, customizable displays, and quantitative flux metrics, enabling operators to monitor and analyze flux dynamics intuitively. Predefined training scenarios facilitate operator proficiency in neutron detection processes cost-effectively and safely, ensuring robust monitoring and calibration tailored to CiADS's unique operational requirements driven by the spallation neutron source. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:The China initiative Accelerator Driven subcritical System (CiADS), scheduled for commissioning in 2029, demands precise neutron flux monitoring to ensure operational safety and stability of its coupled nuclear system, requiring high reliability and minimal fault tolerance. Real-time monitoring of core neutron flux is critical to mitigate risks from dynamic flux variations driven by an external neutron source via spallation reactions, ensuring optimal power control and system integrity. The compact CiADS core structure and lead-bismuth eutectic coolant environment pose significant challenges for in-core detector deployment due to material degradation under irradiation and spatial constraints, necessitating reliance on ex-core neutron detectors strategically positioned within the facility. To address these challenges, a sophisticated digital neutron flux monitoring platform with advanced online visualization has been developed to continuously reconstruct the core flux distribution in the subcritical reactor. A comprehensive response matrix database, constructed using the Monte Carlo method across diverse operating conditions, enhances reconstruction accuracy. Tikhonov regularization stabilizes the response matrix, minimizing computational uncertainties. The platform's online visualization interface delivers real-time, interactive 3D rendering of core power distribution, featuring dynamic heatmaps, customizable displays, and quantitative flux metrics, enabling operators to monitor and analyze flux dynamics intuitively. Predefined training scenarios facilitate operator proficiency in neutron detection processes cost-effectively and safely, ensuring robust monitoring and calibration tailored to CiADS's unique operational requirements driven by the spallation neutron source. [ABSTRACT FROM AUTHOR]
ISSN:01491970
DOI:10.1016/j.pnucene.2026.106413