Hybrid Monte Carlo approach for accurate and efficient shutdown dose rate calculation

Lu, Peng; Fischer, U.; Pereslavtsev, P.; Qiu, Yuefeng; Serikov, A.; Li, Jiangang; Song, Yuntao

doi:10.1016/j.fusengdes.2018.03.005

Cited by 12 publications

(5 citation statements)

References 10 publications

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“…In conjunction with the 10% stated experimental uncertainty, it is clear that we should regard the simulation results as rough estimates and that it would be unreasonable to expect perfect agreement with experiment given the magnitude of the uncertainties. Further validation against other experiments, such as ones performed on JET [14], would provide further confidence in the code system and is recommended as future work.…”

Section: Discussionmentioning

confidence: 95%

“…For these reasons, we consider an SDR calculation as the 'measuring stick' for the capabilities of a nuclear analysis toolchain in the design of fusion energy systems. There are two primary methods for performing SDR calculations: the Rigorous 2-Step (R2S) method [11] and the Direct 1-Step (D1S) method [12,13] (several recent articles have proposed new methods [14,15] that improve upon R2S and D1S but have not yet been widely adopted to our knowledge). The R2S and D1S methods each have their own advantages and limitations, but both have been used for large-scale SDR calculations in support of ITER, JET, and other fusion experiments [11,[16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

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Development and validation of fully open-source R2S shutdown dose rate capabilities in OpenMC ^*

Peterson,

Romano,

Shriwise

et al. 2024

Nucl. Fusion

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We present the first fully open-source capabilities for shutdown dose rate(SDR) calculations of fusion energy facilities based on the Rigorous 2-Step(R2S) methodology. These capabilities have been implemented in the OpenMCMonte Carlo particle transport code, building on its existing capabilitieswhile also leveraging new features that have been added to the code to supportSDR calculations, such as decay photon source generation. Each of theindividual physics components in the R2S workflow---neutron transport,activation, decay photon source generation, and photon transport---have beenverified through code-to-code comparisons with MCNP6.2 and FISPACT-II 4.0. Thesecomparisons generally demonstrate excellent agreement betweencodes for each of the physics components. The full cell-based R2S workflow wasvalidated by performing a simulation of the first experimental campaign fromthe Frascati Neutron Generator (FNG) ITER dose rate benchmark problem fromthe Shielding INtegral Benchmark Archive and Database (SINBAD). For short coolingtimes, the dose calculated by OpenMC agrees with the experimental measurementswithin the stated experimental uncertainties. For longer cooling times, anoverprediction of the shutdown dose was observed relative to experiment, whichis consistent with previous studies in the literature. Altogether, these features constitutea combination of capabilities in a single, open-source codebase to provide thefusion community with a readily-accessible option for SDRcalculations and a platform for rapidly analyzing the performance of fusion technology.

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Section: Discussionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Development and validation of fully open-source R2S shutdown dose rate capabilities in OpenMC ^*

Peterson,

Romano,

Shriwise

et al. 2024

Nucl. Fusion

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“…In fusion reactors, both of these assumptions are met as most of the materials are considered to exhibit low burnup [4].…”

Section: Superposition Methodsmentioning

confidence: 99%

“…But its computational complexity rises with the complexity of the input model. In this paper we discuss the approach based on the assumption that a decay gamma source can be determined with linear superposition of the impact from different bins in the neutron flux energy distribution [4]. This assumption is based on the fact that mutual influence of neutron radiation in different energy ranges is negligible.…”

Section: Introductionmentioning

confidence: 99%

Activation of ITER Divertor Neutron Flux Monitor

et al. 2019

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The paper presents results of numerical modelling for the ITER Divertor Neutron Flux Monitor (DNFM) detector modules life time activation. In particular, the rigorous-2-step (R2S) computational methodology was implemented. In addition to MCNP and FISPACT codes the special integration framework MCKIT was applied. The MCKIT provides models preparation and data processing tools. To provide appropriate performance we replaced direct FISPACT inventory calculations with the superposition method described below. The activation characteristics (DPA, contact dose, etc.) were obtained and compared with our results for the previous DNFM design. K: Data processing methods; Models and simulations; Radiation calculations; Radiation damage evaluation methods 1Corresponding author.

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“…The 'on-the-fly' GVR is now an advanced technology used for accelerating the particle transport and has been widely used in CFETR nuclear analysis [9]. The sub-voxel PyNE R2S [10] and NASCA [11] were developed for the SDDR with full validation work and they have been applied to the CFETR calculation. This paper next gives a brief introduction to the activities in the development of the cosVMPT conversion tool and 'on-the-fly' variance reduction technology and their application to CFETR nuclear analysis.…”

Section: Code Developmentmentioning

confidence: 99%

Progress on neutronic analysis for CFETR

Lu¹,

Wu²,

Du³

et al. 2022

Nucl. Fusion

Self Cite

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The neutron induced irradiation field is a key problem in fusion reactor related to nuclear responses, shielding design, nuclear safety, and thermo-hydraulic analysis. To support the system design of China Fusion Engineering Test Reactor (CFETR), the comprehensive analysis of irradiation field has been conducted in support of many new developed advanced tools. The paper first summarizes the recent progress on related neutronics code development effort including the geometry conversion tool cosVMPT, Monte Carlo variance reduction technology ‘on-the-fly’ global variance reduction (GVR). Such developed tools have been fully validated and applied on the CFETR nuclear analysis. The neutron irradiation has been evaluated on CFETR Water Cooled Ceramic Breeder (WCCB) blanket, divertor, vacuum vessel, superconductive coils and four kinds of heating systems including the Electron Cyclotron Resonance Heating (ECRH), Ion Cyclotron Resonance Heating (ICRH), Low Hybrid Wave (LHW) and Neutral Beam Injection (NBI). The nuclear responses of tritium breeding ratio (TBR), heating, irradiation damage, Hydrogen/Helium (H/He) production rate of material have been analyzed. In case of neutron damage and overheating deposition on the superconductive coils and Vacuum Vessel (VV), the interface and shielding design among heating systems, blanket and other systems has been initialized. The results show the shielding design can meet the requirement of coil and VV after several iterated neutronics calculation.

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Hybrid Monte Carlo approach for accurate and efficient shutdown dose rate calculation

Cited by 12 publications

References 10 publications

Development and validation of fully open-source R2S shutdown dose rate capabilities in OpenMC ^*

Development and validation of fully open-source R2S shutdown dose rate capabilities in OpenMC ^*

Activation of ITER Divertor Neutron Flux Monitor

Progress on neutronic analysis for CFETR

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Hybrid Monte Carlo approach for accurate and efficient shutdown dose rate calculation

Cited by 12 publications

References 10 publications

Development and validation of fully open-source R2S shutdown dose rate capabilities in OpenMC *

Development and validation of fully open-source R2S shutdown dose rate capabilities in OpenMC *

Activation of ITER Divertor Neutron Flux Monitor

Progress on neutronic analysis for CFETR

Contact Info

Product

Resources

About

Development and validation of fully open-source R2S shutdown dose rate capabilities in OpenMC ^*

Development and validation of fully open-source R2S shutdown dose rate capabilities in OpenMC ^*