Explanipedia

Status of Serpent Monte Carlo code in 2024 Open

Jaakko Leppänen, Ville Valtavirta, Antti Rintala, Riku Tuominen · 2025

The Serpent Monte Carlo code has been in public distribution for 15 years, and has a large international user basis with both research and commercial applications. Serpent is currently developed as part of the Kraken multi-physics framewor…

Improved polynomial rates of memory loss for nonstationary intermittent dynamical systems Open

Alexey Korepanov, Jaakko Leppänen · 2024

We study nonstationary dynamical systems formed by sequential concatenation of nonuniformly expanding maps with a uniformly expanding first return map. Assuming a polynomially decaying upper bound on the tails of first return times that is…

Evaluation of Life Cycle CO2 Emissions for the LDR-50 Nuclear District Heating Reactor Open

Laura Sokka, Heidi Kirppu, Jaakko Leppänen · 2024

The LDR-50 low-temperature nuclear reactor is designed for the Finnish and European district heating markets, as an environmentally sustainable heating option for the 2030s. While the carbon footprint of conventional electricity-producing …

Advancement of functional expansion tallies capabilities in serpent 2 Open

B. Wendt, Leslie Kerby, Aaron Tumulak, Jaakko Leppänen, Mark DeHart · 2024

An introduction to Spent Nuclear Fuel decay heat for Light Water Reactors: a review from the NEA WPNCS Open

D. Rochman, A. Algora, F. Álvarez‐Velarde, Aurélie Bardelay, Øystein Bremnes , et al. · 2024

This paper summarized the efforts performed to understand decay heat estimation from existing spent nuclear fuel (SNF), under the auspices of the Working Party on Nuclear Criticality Safety (WPNCS) of the OECD Nuclear Energy Agency. Needs …

Methodology, applications and performance of the CAD-based geometry type in the serpent 2 Monte Carlo code Open

Jaakko Leppänen · 2022

The Serpent 2 Monte Carlo code features a CAD-based geometry option for the modeling of complicated and irregular systems. The methodology is based on the STL data format, which is commonly used for computer graphics and 3D printing, and s…

Blind Benchmark Exercise for Spent Nuclear Fuel Decay Heat Open

Peter Jansson, Martin Bengtsson, Ulrika Bäckström, F. Álvarez‐Velarde, Dušan Čalič , et al. · 2022

The decay heat rate of five spent nuclear fuel assemblies of the pressurized water reactor type were measured by calorimetry at the interim storage for spent nuclear fuel in Sweden. Calculations of the decay heat rate of the five assemblie…

Investigation of novel weight window methods in Serpent 2 for fusion neutronics applications Open

Alex Valentine, R. Worrall, Jaakko Leppänen · 2022

Released in 2009, the Serpent Monte Carlo code has established itself as a highly efficient and powerful simulation code for nuclear systems analysis. Originally developed for reactor physics applications, the scope of the code now extends…

Current Status and On-Going Development of VTT’s Kraken Core Physics Computational Framework Open

Jaakko Leppänen, Ville Valtavirta, Antti Rintala, Ville Hovi, Riku Tuominen , et al. · 2022

The Kraken computational framework is a new modular calculation system designed for coupled core physics calculations. The development started at VTT Technical Research Centre of Finland in 2017, with the aim to replace VTT’s outdated lega…

Methodology, Applications and Performance of the Cad-Based Geometry Type in the Serpent 2 Monte Carlo Code Open

Jaakko Leppänen · 2022

Serpent transient analyses of GIACINT geometrical change experiments Open

Alberto Talamo, Yang Cao, Y. Gohar, Ville Valtavirta, Jaakko Leppänen , et al. · 2021

Microscopic cross section calculation methodology in the Serpent 2 Monte Carlo code Open

Antti Rintala, Ville Valtavirta, Jaakko Leppänen · 2021

This paper describes the methodology used by the Monte Carlo particle transport code Serpent to produce homogenized microscopic cross sections. The microscopic cross sections can be used for multiple purposes for example in nodal programs.…

Loss of Memory and Moment Bounds for Nonstationary Intermittent Dynamical Systems Open

Alexey Korepanov, Jaakko Leppänen · 2021

SERPENT2-SUBCHANFLOW-TRANSURANUS PIN-BY-PIN DEPLETION CALCULATIONS FOR A PWR FUEL ASSEMBLY Open

Manuel García, Riku Tuominen, André Gommlich, Diego Ferraro, Ville Valtavirta , et al. · 2021

This work presents the results for a coupled neutronic-thermalhydraulic-thermomechanic pin-level depletion calculation of a PWR fuel assembly using Serpent2-SUBCHANFLOW-TRANSURANUS. This tool is based on a semi-implicit depletion scheme wi…

EFFECT OF ENERGY DEPOSITION MODELLING IN COUPLED STEADY STATE MONTE CARLO NEUTRONICS/THERMAL HYDRAULICS CALCULATIONS Open

Riku Tuominen, Ville Valtavirta, Manuel García, Diego Ferraro, Jaakko Leppänen · 2021

In coupled calculations with Monte Carlo neutronics and thermal hydraulics the Monte Carlo code is used to produce a power distribution which in practice means tallying the energy deposition. Usually the energy deposition is estimated by m…

A SUBCHANNEL COARSENING METHOD FOR Serpent2-SUBCHANFLOW APPLIED TO A FULL-CORE VVER PROBLEM Open

Manuel García, Diego Ferraro, Ville Valtavirta, Riku Tuominen, Uwe Imke , et al. · 2021

This work presents a methodology to coarsen subchannel models to accelerate largescale Serpent2-SUBCHANFLOW calculations. The method is based on first building a fully detailed subchannel model and then combining subchannels into larger ch…

ENHANCING THE PERFORMANCE OF FISSION SOURCE CONVERGENCE WITH FUNCTIONAL EXPANSION TALLIES IN SERPENT 2 MONTE CARLO CODE Open

Ana Jambrina, Jaakko Leppänen, Heikki Suikkanen · 2021

This paper presents an upgrade to the built-in response matrix based solver implemented in Serpent 2 Monte Carlo code aiming to improve the fission source convergence when obtaining the forward solution to the k -eigenvalue criticality sou…

THE McSAFE PROJECT - HIGH-PERFORMANCE MONTE CARLO BASED METHODS FOR SAFETY DEMONSTRATION: FROM PROOF OF CONCEPT TO INDUSTRY APPLICATIONS Open

Víctor Hugo Sánchez-Espinoza, L. Mercatali, Jaakko Leppänen, E. Hoogenboom, R. Vočka , et al. · 2021

The increasing use of Monte Carlo methods for core analysis is fostered by the huge and cheap computer power available nowadays e.g. in large HPC. Apart from the classical criticality calculations, the application of Monte Carlo methods fo…

SERPENT/SUBCHANFLOW COUPLED CALCULATIONS FOR A VVER CORE AT HOT FULL POWER Open

Diego Ferraro, Manuel García, Uwe Imke, Ville Valtavirta, Riku Tuominen , et al. · 2021

An increasing interest on the development of highly accurate methodologies in reactor physics is nowadays observed, mainly stimulated by the availability of vast computational resources. As a result, an on-going development of a wide range…

SERPENT/SUBCHANFLOW COUPLED BURNUP CALCULATIONS FOR VVER FUEL ASSEMBLIES Open

Diego Ferraro, Manuel García, Uwe Imke, Ville Valtavirta, Riku Tuominen , et al. · 2021

The continuous improvement in nuclear industry safety standards and reactor designers’ and operators’ commercial goals represent a push for the development of highly accurate methodologies in reactor physics. This fact, combined with the a…

HIGH FIDELITY AND REDUCED ORDER SOLUTIONS TO AN SMR-LEVEL PROGRESSION PROBLEM WITH THE KRAKEN COMPUTATIONAL FRAMEWORK Open

Ville Valtavirta, Unna Lauranto, Ville Hovi, Jussi Peltonen, Antti Rintala , et al. · 2021

Kraken is a new computational reactor analysis framework under development at VTT Technical Research Center of Finland Ltd. The framework builds heavily on the new generation of Finnish simulation codes such as the Serpent Monte Carlo code…

EFFECT OF THE UNIFORM FISSION SOURCE METHOD ON LOCAL POWER VARIANCE IN FULL CORE SERPENT CALCULATION Open

Y. Bilodid, Jaakko Leppänen · 2021

One of challenges of the Monte Carlo full core simulations is to obtain acceptable statistical variance of local parameters throughout the whole reactor core at a reasonable computation cost. The statistical variance tends to be larger in …

BENCHMARKING OF THE SERPENT 2 MONTE CARLO CODE FOR FUSION NEUTRONICS APPLICATIONS Open

Alex Valentine, B. Colling, R. Worrall, Jaakko Leppänen · 2021

Analyses of radiation fields resulting from a deuterium-tritium (DT) plasma in fusion devices is a critical input to the design and validation of many aspects of the reactor design, including, shielding, material lifetime and remote mainte…

Serpent/SUBCHANFLOW pin-by-pin coupled transient calculations for the SPERT-IIIE hot full power tests Open

Diego Ferraro, Manuel García, Ville Valtavirta, Uwe Imke, Riku Tuominen , et al. · 2020

EU FP7 Project: HPMC-High Performance Monte Carlo (HPMC) Rector Core Analysis (Proof of Concept) Open

Víctor Hugo Sánchez-Espinoza, J.E. Hoogenboom, Jan Dufek, Jaakko Leppänen · 2019

McSAFE- High performance monte Carlo Methods for SAFETy Demonstration Open

Voctor Sánchez-Espinoza, L. Mercatali, Davide Mancusi, Philip J. Smith, Jan Dufek , et al. · 2019

Benchmark of Serpent-2 with MCNP: application to EU fusion DEMO HCPB breeding blanket Open

Yudong Lua, Guangming Zhou, Francisco A. Hernández, P. Pereslavtsev, Jaakko Leppänen , et al. · 2019

Serpent and TRIPOLI-4® transient calculations comparisons for several reactivity insertion scenarios in a 3D PWR minicore benchmark Open

Diego Ferraro, Margaux Faucher, Davide Mancusi, Andrea Zoia, Ville Valtavirta , et al. · 2019

High-fidelity multiphysics simulations for Light Water Reactors in the McSAFE H2020 project Open

L. Mercatali, Víctor Hugo Sánchez-Espinoza, Manuel García, Diego Ferraro, Uwe Imke , et al. · 2019

Development of a Spatial Domain Decomposition Scheme for Monte Carlo Neutron Transport Open

Manuel García, Diego Ferraro, Víctor Hugo Sánchez-Espinoza, L. Mercatali, Jaakko Leppänen , et al. · 2018

The computing power available nowadays to the average Monte-Carlo-code user is sufficient to perform large-scale neutron transport simulations, such as full-core burnup or high-fidelity multiphysics. In practice however, software limitatio…

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