MELCOR 1.8.5 modeling aspects of fission product release, transport and deposition an assessment with recommendations.

Gauntt, Randall O.

doi:10.2172/991532

Cited by 7 publications

(12 citation statements)

References 4 publications

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“…The data from the ORNL HI/VI, VERCORS and Phebus-FP tests were analyzed by the CORSOR model series [24,39,40]. The release rate equation in the CORSOR-M model can depict the fractional release of each FP using the Actinide Pu Release enhanced by redistribution in the fuel (below 2310 K) [28] PuO [24,28] individual release rate coefficient, k (min -1 ).…”

Section: Analytical Research Studies For Fp and Actinide Release Behamentioning

confidence: 99%

Research Program for the Evaluation of Fission Product and Actinide Release Behaviour, Focusing on their Chemical Forms

et al. 2015

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We have launched a new research program for evaluation of fission product and actinide release behaviour under severe accident conditions, focusing on their chemical forms. In this research program, the fission product and actinide release models incorporated in the severe accident analysis code will be improved by implementing effects of chemical forms that are to be obtained by an experimental investigation on the fission product and actinide release behaviour from irradiated fuels. A novel insitu measurement method of chemical forms of fission products and actinides just after their release as well as an off-line analysis method will be employed as the experimental means for evaluating the chemical forms at the release and their stability after release.

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Section: Analytical Research Studies For Fp and Actinide Release Behamentioning

confidence: 99%

Research Program for the Evaluation of Fission Product and Actinide Release Behaviour, Focusing on their Chemical Forms

et al. 2015

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“…As a result, sensitivity analyses regarding h may be conducted to verify the property and gain insights on acceptable step size h (e.g. see [9]). For adaptive time-stepping schemes, the sensitivities have been studied for values of tolerance instead of h (e.g.…”

Section: B Local Convergence Verification and Data Generationmentioning

confidence: 99%

“…As illustrated by the simulation codes in the field of severe accident analysis (e.g. MAAP or THALES2 [21]), this type of problem needs very fast computation, and thus adaptive schemes with local error methods are usually not accepted [9], [20]. As a result, the simulation codes have required the extensive use of well experienced analysts' insights in order to properly determine time-step sizes (these simulators ask users to define time-step adjusting functions [9]).…”

Section: A Problem Descriptionmentioning

confidence: 99%

“…The objective of the approach is to maintain the local error or the changing rate under a particular tolerance. Also, time-step controlling functions have been arbitrarily defined based on analysts' experiences in order to map dynamical systems' states into particular time-step sizes [9].…”

Section: Introductionmentioning

confidence: 99%

“…Also, absolute or relative changes of systems' states were used as criteria [8], [9]. These two approaches are preferred mostly by computer simulators that require fast calculation since these add only negligible computational cost in general.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

An Adaptive Time-Stepping Scheme with Local Convergence Verification Using Support Vector Machines

Kawaguchi¹,

Ishikawa²,

Maruyama³

2014

IJET

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Abstract-An adaptive time-stepping scheme in accordance with the local convergence of computation often involves computationally expensive procedures. As a result, many computer simulators have avoided utilizing such an adaptive scheme, while its advantages are well recognized; the scheme not only efficiently allocates computational resources, but also makes the results of the computation more reliable. In this paper, we propose a fast adaptive time-stepping scheme, ATLAS (Adaptive Time-step Learning and Adjusting Scheme), which approximates such an expensive yet beneficial scheme by using support vector machines (SVMs). We demonstrate that ATLAS performs quite favorably when compared with computations without it. ATLAS can incorporate existing solvers and other fast but unreliable adaptive schemes to meet the different criteria required in various applications.Index Terms-Adaptive time step control, machine learning, ordinary differential equations, severe accident analysis.

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Coupled modeling of irradiated fuel thermochemistry and gas diffusion during severe accidents

Germain

Sercombe

Riglet-Martial

et al. 2022

Journal of Nuclear Materials

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MELCOR 1.8.5 modeling aspects of fission product release, transport and deposition an assessment with recommendations.

Cited by 7 publications

References 4 publications

Research Program for the Evaluation of Fission Product and Actinide Release Behaviour, Focusing on their Chemical Forms

Research Program for the Evaluation of Fission Product and Actinide Release Behaviour, Focusing on their Chemical Forms

An Adaptive Time-Stepping Scheme with Local Convergence Verification Using Support Vector Machines

Coupled modeling of irradiated fuel thermochemistry and gas diffusion during severe accidents

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