Assessment of ex-core neutron detectors in prototype Gen-IV sodium-cooled fast reactor (PGSFR)

Donny Hartanto, Min Jae Lee, Nhu Viet Ha Pham, Jae Yong Lim

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

This paper presents the assessment of the ex-core detectors in the Prototype Gen-IV Sodium-cooled Fast Reactor (PGSFR) in response to the movement of single primary control assembly, to evaluate the detectors’ locations and to determine a proper number of detectors. The detectors are located below the containment vessel and distributed in different ranges from the center and different azimuthal angles. Another position considered is in the radial direction of the core, at the sodium coolant gap between the outermost assembly and core shroud. To calculate the detection rate, the contribution of each fuel region to the detector and the core power distribution are required. Initially, the aforementioned contribution is generated by performing a continuous-energy forward fixed-source Monte Carlo calculation using MCNPX. The reactor kinetics code FREK simulates the power change due to an inadvertent withdrawal of a primary control assembly up to 10% from its critical position followed by full insertion of secondary control assemblies. The response from each detector location was evaluated, and consequently, the detectors located below the containment vessel, which can “see” all the fuel assemblies, responded better to the core power increase with a minor error of less than ∼0.6%. In addition, the impact of locating the detector below the containment vessel at different locations from the center or at different azimuthal angles was insignificant but several detectors should be distributed at even azimuthal angles for effective core monitoring and redundancy purposes.

Original languageEnglish
Pages (from-to)110-121
Number of pages12
JournalAnnals of Nuclear Energy
Volume126
DOIs
StatePublished - Apr 2019
Externally publishedYes

Funding

This work was supported by a National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIP) (No. NRF-2012M2A8A2025624). This work was supported by a National Research Foundation of Korea (NRF) grant funded by the Korean government ( MSIP ) (No. NRF - 2012M2A8A2025624 ).

FundersFunder number
National Research Foundation2012M2A8A2025624
Ministry of Science, ICT and Future Planning
National Research Foundation of Korea
Ministry of Science ICT and Future Planning

    Keywords

    • ADVANTG
    • Ex-core detector
    • FREK
    • MCNPX
    • PGSFR
    • Spatial weighting function

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