ACTYS-1-GO: A faster and accurate algorithm for multipoint nuclear activation calculations

Kanth, Priti; Tadepalli, Sai Chaitanya; Srinivasan, R.; Subhash, P.V.

doi:10.1016/j.fusengdes.2017.08.022

Cited by 6 publications

(4 citation statements)

References 20 publications

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“…ACTYS-1-GO is a multipoint activation code that uses a robust algorithm to make it suitable for simultaneous multiple point calculations using linear chain solver for a given flux. The various techniques for single point and multipoint activation solver are detailed in [24,25]. In multipoint calculations, the entire nuclear device is divided into small sections called meshes.…”

Section: Implementation Of Optimization Procedures In Actys-1-gomentioning

confidence: 99%

“…This drastic reduction in matrix size significantly reduces the runtime of the code. In [25], FENDL activation benchmark problem is used to compare the computational performance between ACTYS-1-GO and sequential ACTYS and FISPACT calculations. ACTYS-1-GO generates nine different superlist for all the nine materials located at 317 mesh points.…”

Section: Implementation Of Optimization Procedures In Actys-1-gomentioning

confidence: 99%

“…From equation (1) it can be seen that one dominating radio-isotope can be produced from many different parents and these different parents would also be producing other isotopes. This creates a complicated activation tree with branching, loops and cross-linking [25,44]. Because of this, evaluation of exact contribution from parent to dominating isotopes becomes very cumbersome and difficult.…”

Section: Cooling Timementioning

confidence: 99%

“…As a first step, a singlepoint nuclear activation code 'ACTYS' has been developed [24]. After that, a fast and accurate algorithm for multipoint activation calculation is developed and is implemented in a computer code named 'ACTYS-1-GO' [25]. It speeds up the calculations by generating a reduced common coefficient matrix for every material in the device based on one or more radiological quantities.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Composition optimization strategy based on multiple radiological responses for materials in spatially and temporally varying neutron fields

Kanth¹,

Tadepalli²,

Subhash³

2018

Nucl. Fusion

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Structural materials present in and around any fusion device will face stringent conditions due to the high-energy and high-flux neutrons emitted from the fusion plasma. These neutrons can cause induced radioactivity, gas production, energetic knock out atoms, atomic displacement and decay heat in these materials. This would have a significant life-limiting impact on the materials and would also cause biological hazards and radioactive waste. Hence designing low activation materials for fusion devices is warranted. This paper presents a novel tool for quantification of radiological responses in terms of the elements present in the initial material composition. Such a framework would help in the identification and optimization of the fraction of most dangerous elements/isotopes from the material composition. In practical scenarios, the material encounters a large spatial and temporal variation of neutron fluxes. This problem has been effectively treated in the present work using a multi-parameter optimization scheme. The scheme optimizes the material composition (elemental or isotopic) based on various nuclear responses and there spatial and temporal variations within the user-defined constraints. This scheme is further included in the multi-point activation code ACTYS-1-GO. The tool provides a comprehensive picture of the material response during neutron irradiation and after shutdown, enabling the assessment of structural integrity of components in a fusion device. As an aide to the material optimization process, this paper also introduces a visual representation of the evaluated information like quantification of radiological responses produced by the parent elements/isotopes in a material. This has been implemented through a series of spectrum independent and spectrum-dependent diagrams called the radiation response diagrams. These diagrams show the variation of contributing parents toward the radiological responses as a function of cooling time. Such a graph could be very useful as a first approximation for material design.

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Section: Implementation Of Optimization Procedures In Actys-1-gomentioning

confidence: 99%

Section: Implementation Of Optimization Procedures In Actys-1-gomentioning

confidence: 99%

Section: Cooling Timementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Composition optimization strategy based on multiple radiological responses for materials in spatially and temporally varying neutron fields

Kanth¹,

Tadepalli²,

Subhash³

2018

Nucl. Fusion

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Computing low‐rank approximations of the Fréchet derivative of a matrix function using Krylov subspace methods

Kandolf

Koskela

Relton

et al. 2021

Numerical Linear Algebra App

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The Fréchet derivative L f (A, E) of the matrix function f (A) plays an important role in many different applications, including condition number estimation and network analysis. We present several different Krylov subspace methods for computing low-rank approximations of L f (A, E) when the direction term E is of rank one (which can easily be extended to general low rank). We analyze the convergence of the resulting methods both in the Hermitian and non-Hermitian case. In a number of numerical tests, both including matrices from benchmark collections and from real-world applications, we demonstrate and compare the accuracy and efficiency of the proposed methods.

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Simplified recursive relations for the derivatives of Bateman linear chain solution and their application to sensitivity and multi-point analysis

Tadepalli

Subhash

2018

Annals of Nuclear Energy

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ACTYS-1-GO: A faster and accurate algorithm for multipoint nuclear activation calculations

Cited by 6 publications

References 20 publications

Composition optimization strategy based on multiple radiological responses for materials in spatially and temporally varying neutron fields

Composition optimization strategy based on multiple radiological responses for materials in spatially and temporally varying neutron fields

Computing low‐rank approximations of the Fréchet derivative of a matrix function using Krylov subspace methods

Simplified recursive relations for the derivatives of Bateman linear chain solution and their application to sensitivity and multi-point analysis

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